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<h1>CFEngine in a day</h1>
</section>
<section>
<section id="slide-org89ed10b" data-timing="120">
<h2 id="org89ed10b">Before we start</h2>
</section>
<section id="slide-org6d82b40">
<h3 id="org6d82b40">Schedule</h3>
<ul>
<li>9:30 AM - 5:00 PM</li>
<li>We will check need for breaks at the end of each section</li>

</ul>

<aside class="notes">
<ul>
<li>Who will volunteer to <b>remind me of breaks</b>?</li>

</ul>

</aside>


</section>
<section id="slide-orgea3a205">
<h3 id="orgea3a205">Use the source</h3>
<p>
<a href="https://github.com/nickanderson/cfengine-training">github.com/nickanderson/cfengine-training</a>
</p>

<aside class="notes">
<p>
See a <b>mistake</b>? Please consider submitting a Pull Request.
</p>

</aside>

</section>
<section id="slide-org5c6c089">
<h3 id="org5c6c089">Hi, I'm Nick</h3>
<ul>
<li>Wife, 2 kids and a dog</li>
<li>Sysadmin/Infrastructure Engineer/Doer of things</li>
<li>CFEngineering since ~2010</li>
<li>Find me online
<ul>
<li><a href="mailto:nick.anderson@cfengine.com">nick.anderson@northern.tech</a> | <a href="https://cfengine.com/author/nick-anderson/">https://cfengine.com/author/nick-anderson/</a></li>
<li><a href="https://fosstodon.org/@nickanderson">@nickanderson@fosstodon.org</a> |  <a href="https://twitter.com/cmdln_">@cmdln_</a></li>
<li><a href="mailto:nick@cmdln.org">nick@cmdln.org</a> | <a href="https://cmdln.org">https://cmdln.org</a></li>
<li><a href="https://linkedin.com/in/hithisisnick">linkedin.com/in/hithisisnick</a></li>
<li><code>9274 E588 E866 A10B 713C  9CCD 9EB3 AD42 5D1C CC11</code></li>

</ul></li>

</ul>

<aside class="notes">
<p>
I have worked in a wide variety of environments:
</p>
<ul>
<li>Geek on wheels</li>
<li>One man IT department</li>
<li>E-commerce</li>
<li>Large Enterprise</li>
<li>High Performance Computing</li>
<li>Usually working closely with developers</li>

</ul>

</aside>
</section>
<section id="slide-org19f850d">
<h3 id="org19f850d">Who are you?</h3>
<ul>
<li>Name</li>
<li>Role</li>
<li>Goals for this training</li>

</ul>

</section>
</section>
<section>
<section id="slide-org0fd716c">
<h2 id="org0fd716c">What this training covers</h2>
<ul>
<li>What is CFEngine</li>
<li>High level architecture overview</li>
<li>Language fundamentals (through CFEngine 3.21.0)</li>
<li>Examples and Exercises</li>
<li>Useful tooling and tips</li>

</ul>
</section>
</section>
<section>
<section id="slide-org6b8a8e6">
<h2 id="org6b8a8e6">Why Automation?</h2>
<blockquote>
<p>
Every time someone logs onto a system by hand, they jeopardize everyone's
understanding of the system. &#x2013; Mark Burgess
</p>
</blockquote>

</section>
</section>
<section>
<section id="slide-orge1c656b">
<h2 id="orge1c656b">What is CFEngine?</h2>
<ul>
<li>Secure</li>
<li>Scalable</li>
<li>Agile <b>infrastructure automation tool</b></li>

</ul>

<aside class="notes">
<p>
Designed to enable continuous operations using a distributed model based approach.
</p>

<dl>
<dt>Modern</dt><dd>Understands complex data structures (JSON, YAML, CSV).</dd>

</dl>

</aside>

</section>
<section id="slide-org68322a4">
<h3 id="org68322a4">History</h3>
<ul>
<li>Written by <a href="https://en.wikipedia.org/wiki/Mark_Burgess_(computer_scientist)">Mark Burgess</a></li>
<li>Originally released in 1993.</li>
<li><a href="http://people.scs.carleton.ca/~soma/biosec/readings/burgess-immunology.pdf">Computer Immunology</a> (Self Healing) 1998</li>
<li>CFEngine 2 (1998)</li>
<li><a href="http://download.springer.com/static/pdf/884/chp%25253A10.1007%25252F11568285_9.pdf">Promise Theory</a> (2005)</li>
<li>CFEngine 3 (2008)</li>
<li>Company Founded (2008)</li>

</ul>

<aside class="notes">
<dl>
<dt>Wait, it's been around since 1993, what makes it <i>modern</i>?</dt><dd>Understands complex data structures (JSON, YAML, CSV).</dd>

</dl>

</aside>

</section>
<section id="slide-org2ca3dce">
<h3 id="org2ca3dce">Small</h3>
<p>
As of Feb 2020:
</p>

<ul>
<li><a href="https://lgtm.com/projects/g/cfengine/core/context:cpp">Lines of code</a> ~ 115k</li>
<li>~ 6M Package size</li>
<li>Memory Utilization: ~ 80MB
<ul>
<li>cf-agent ~ 30MB</li>
<li>cf-serverd ~ 30MB</li>
<li>cf-execd ~10MB</li>
<li>cf-monitord ~ 10MB</li>

</ul></li>

</ul>

</section>
<section id="slide-orgd1e5499">
<h3 id="orgd1e5499">Secure</h3>
<p>
A good track record.
</p>

<ul>
<li><a href="http://web.nvd.nist.gov/view/vuln/search">http://web.nvd.nist.gov/view/vuln/search</a></li>

</ul>

</section>
<section id="slide-orgeecd8bd">
<h3 id="orgeecd8bd">Portable</h3>
<p>
Known to run on many platforms, and interesting places.
</p>


<div id="org89fad1a" class="figure">
<p><img src="data/4d/85802b-4bd6-4473-be8c-4add03fa9c6c/Where_CFEngine_Runs_2016-10-15_15-20-42.png" alt="Where_CFEngine_Runs_2016-10-15_15-20-42.png" width="600" />
</p>
</div>

<aside class="notes">
<ul>
<li>Platforms: Linux, HPUX, Solaris (sparc/x86), AIX, Windows, Android,</li>
<li>Largest known plant is ~1M nodes</li>
<li>Smart infrastructure (interactive bus signs in France)
<ul>
<li>Interactive Bus Signs in France</li>
<li>Automated payment system collections</li>

</ul></li>
<li>Lasers (that make puppets)
<ul>
<li>From Hallway track at LISA 2013</li>

</ul></li>
<li>Dialysis Machines (over 50% of machines in the US)
<ul>
<li>From user report</li>

</ul></li>
<li>Appliances
<ul>
<li>Ezuce sipXecs (Voip), <a href="https://sipfoundry.atlassian.net/wiki/display/sipXecs/cfengine+tips">Blog Post</a></li>
<li>StashNode Pro, <a href="https://github.com/Cryptoo/cfengine">Cryptoo</a>
<ul>
<li>DMZ</li>
<li>Tor</li>
<li>Bitcoin</li>
<li>Bittorrent</li>

</ul></li>

</ul></li>

</ul>

</aside>

</section>
<section id="slide-org591874a">
<h3 id="org591874a">Resilient &amp; Autonomous</h3>
<div class="column" style="float:left; width:50%">

<div id="orge0203a6" class="figure">
<p><img src="data/29/81a0e7-5430-44bd-84b3-32928fbdeea1/2020-02-18_11-16-51_JAN15_05_179787493.jpg" alt="2020-02-18_11-16-51_JAN15_05_179787493.jpg" width="800" />
</p>
</div>
</div>

<div class="column" style="float:right; width:50%">
<ul>
<li>Policy cached locally</li>
<li>Decisions made locally</li>
<li>Actions taken locally</li>
<li>Convergence, repair what you can and revisit soon</li>

</ul>
</div>

<aside class="notes">
<ul>
<li>Rely on others as little as possible</li>
<li>Failures don't block by default</li>
<li>Run frequently
<ul>
<li>Who's written a script?</li>
<li>When it's time to execute that script 6 months later, what do you do?</li>

</ul></li>

</ul>

</aside>
</section>
<section id="slide-orgc117715">
<h3 id="orgc117715">Declarative</h3>
<p>
Focus on the <b>desired end state</b>.
</p>

<aside class="notes">
<ul>
<li>The GOAL</li>
<li>Align with business priorities</li>
<li>Less about How specifically you want to arrive somewhere, and more about what specifically you want in the end.
<ul>
<li>I want my steak medium rare.</li>
<li>vs</li>
<li>I want a 22mm thick steak, cooked at 325 degrees for 3.5 minutes on each side.</li>

</ul></li>

</ul>

</aside>

</section>
<section>


<div id="org2c8253e" class="figure">
<p><img src="data/a6/e60c34-5641-48b6-913b-85e54fa9effd/declarative_vs_imperative_crop_2016-10-15_15-28-37.png" alt="declarative_vs_imperative_crop_2016-10-15_15-28-37.png" />
</p>
</div>

</section>
<section id="slide-orgc393cb6">
<h3 id="orgc393cb6">Declarative vs Imperative</h3>
<pre class="example" id="org1c569a8">
bundle agent main             | #!/bin/env/bash
{                             | PKG="openssh-server"
  packages:                   | rpm -q ${PKG} || yum install ${PKG}
       "openssh-server"       | yum check-update openssh-server
         policy =&gt; "present", | if [ $? -eq 100 ]; then
         version =&gt; "latest"; |   yum upgrade openssh-server
}                             | fi
</pre>

<aside class="notes">
<p>
Goals &amp; Way-points vs Strict Order of operations
</p>

<p>
It works kind of like a GPS. It doesn't matter where you start, or the wrong
turns you make it will continually re-route to reach the destination. And your
still responsible for driving, the GPS doesn't drive your car (would you trust
it to? (Alaskan airports, ponds, fields, etc &#x2026;)
</p>

<p>
<a href="http://blog.aggregatedintelligence.com/2009/06/difference-between-imperative-and.html">http://blog.aggregatedintelligence.com/2009/06/difference-between-imperative-and.html</a>
<a href="http://channel9.msdn.com/blogs/pdc2008/tl16">http://channel9.msdn.com/blogs/pdc2008/tl16</a>
</p>

</aside>

</section>
<section id="slide-org33a2f43">
<h3 id="org33a2f43">Typical use cases</h3>
<ul>
<li>Any <b>local</b> resource/state
<ul>
<li>Manage files, processes, commands</li>

</ul></li>
<li>Security Hardening</li>
<li>Compliance</li>
<li>Application Deployment/Management</li>
<li>Inventory</li>

</ul>

<aside class="notes">
<ul>
<li>Interesting places:
<ul>
<li>Industrial (lazer cutters, water testing devices)</li>
<li>Smart Infrastructure (Trains, Trams, Signs, Grocery Shopper Behaviour)</li>

</ul></li>
<li>Integrating CFEngine with other services
<ul>
<li>Set environment from ServiceNow CMDB
<ul>
<li>Hub caches information from ServiceNow, provided to agents as structured data</li>

</ul></li>

</ul></li>
<li>Extrememly dynamic policies
<ul>
<li>When production host has deviated from "normal" amount of outbound ssh
connections kill ssh sessions, firewall host, ticket.</li>

</ul></li>

</ul>

</aside>

</section>
</section>
<section>
<section id="slide-org2a4a4a4">
<h2 id="org2a4a4a4">Editions</h2>
</section>
<section id="slide-orgca0ac94">
<h3 id="orgca0ac94">Community (core)</h3>
<ul>
<li><a href="https://github.com/cfengine/core">Github</a></li>
<li><a href="https://cfengine.com/product/community/source-code/">Tarballs</a></li>
<li><a href="https://cfengine.com/product/community/">Binary Packages</a></li>
<li><a href="https://cfengine.com/product/community/cfengine-linux-distros/">Linux Package Repositories</a></li>

</ul>

</section>
<section id="slide-org849048c">
<h3 id="org849048c">Enterprise Features</h3>
<div class="column" style="float:left; width:50%">
<ul>
<li>Mission Portal (Web UI)</li>
<li>Alerts and Triggered Actions</li>
<li>Inventory Reporting</li>
<li>Change Reporting</li>
<li>Compliance Reporting</li>

</ul>
</div>

<div class="column" style="float:right; width:50%">
<ul>
<li>File Integrity Monitoring</li>
<li>Measurements</li>
<li>REST APIs</li>
<li>SQL Reporting</li>
<li>Single Pane of Glass Reporting</li>

</ul>
</div>

</section>
<section id="slide-org241fa02">
<h3 id="org241fa02">Enterprise</h3>
<ul>
<li><a href="https://docs.cfengine.com/latest/guide-installation-and-configuration-general-installation-installation-enterprise-vagrant.html">Vagrant Environment</a></li>
<li><a href="http://cfengine.com/product/cfengine-enterprise-free-25/">Binary Packages</a></li>

</ul>

</section>
<section id="slide-orge4877e3">
<h3 id="orge4877e3">Release schedule</h3>
<ul>
<li>Every 6 months</li>
<li>New LTS series every 1.5 years</li>

</ul>

</section>
<section id="slide-org64efe27">
<h3 id="org64efe27">Current Releases</h3>
<ul>
<li>3.18 ( June 2021 - June 2024 )
<ul>
<li>3.18.2 ( June 2022 )</li>

</ul></li>

<li>3.21 ( December 2022 - December 2025 )
<ul>
<li>3.21.0 ( December 22nd 2022 )</li>

</ul></li>

</ul>

</section>
</section>
<section>
<section id="slide-org0b96e00">
<h2 id="org0b96e00">Tools</h2>
<div class="outline-text-2" id="text-org0b96e00">
</div>
</section>
<section id="slide-org4554c50">
<h3 id="org4554c50"><code>cf-remote</code></h3>
<p>
Tooling to facilitate the deployment of CFEngine.
</p>

<pre class="example" id="orgd331236">
Commands (use cf-remote COMMAND --help to get more info):
  {info,install,uninstall,packages,list,download,run,save,sudo,scp,spawn,show,destroy,deploy}
    info                Get info about the given hosts
    install             Install CFEngine on the given hosts
    uninstall           Install CFEngine on the given hosts
    packages            Get info about available packages
    list                List CFEngine packages available for download
    download            Download CFEngine packages
    run                 Run the command given as arguments on the given hosts
    save                Save host(s) with a group name to use in other
                        commands
    sudo                Run the command given as arguments on the given hosts
                        with 'sudo'
    scp                 Copy the given file to the given hosts
    spawn               Spawn hosts in the clouds
    show                Show hosts spawned by or added to cf-remote
    destroy             Destroy hosts spawned in the clouds
    deploy              Deploy policy-set (masterfiles) to hub
</pre>


</section>
<section id="slide-org7ccb500">
<h4 id="org7ccb500">Install <code>cf-remote</code></h4>
<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
pip3 install cf-remote
:
</code></pre>
</div>

</section>
<section id="slide-orge87d71b">
<h4 id="orge87d71b">Install and bootstrap with <code>cf-remote</code></h4>
<div class="org-src-container">
<label class="org-src-name">Install and bootstrap remote hosts</label>
<pre><code class="shell" >cf-remote install --hub 34.252.28.73 --bootstrap 172.31.30.237
</code></pre>
</div>

</section>
<section id="slide-orga06329d">
<h4 id="orga06329d">Learn more about <code>cf-remote</code></h4>
<ul>
<li><a href="https://cfengine.com/tags/cf-remote/">https://cfengine.com/tags/cf-remote/</a></li>
<li><a href="https://github.com/cfengine/core/tree/master/contrib/cf-remote">https://github.com/cfengine/core/tree/master/contrib/cf-remote</a></li>

</ul>

</section>
<section id="slide-org918b1f0">
<h3 id="org918b1f0"><code>cfbs</code></h3>
<p>
Manage CFEngine Build projects (adding modules, policy files, updating etc.)
</p>

<pre class="example" id="orgc78f696">
usage: cfbs [-h] [--loglevel LOGLEVEL] [--version] [--force]
            [--non-interactive] [--index INDEX] [--check]
            [--checksum CHECKSUM] [--keep-order] [--git {yes,no}]
            [--git-user-name GIT_USER_NAME] [--git-user-email GIT_USER_EMAIL]
            [--git-commit-message GIT_COMMIT_MESSAGE] [--ignore-versions-json]
            [cmd] [args ...]

CFEngine Build System.

positional arguments:
  cmd                   The command to perform (add, build, clean, commit,
                        download, help, info, init, input, install, pretty,
                        remove, search, show, status, update, validate)
  args                  Command arguments

</pre>

</section>
<section id="slide-orge692837">
<h4 id="orge692837">Install <code>cfbs</code></h4>
<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
pip3 install cfbs
:
</code></pre>
</div>

</section>
<section id="slide-org60c12cd">
<h4 id="org60c12cd">Initialize a project</h4>
<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
cfbs init
:
</code></pre>
</div>

</section>
<section id="slide-org9086a18">
<h4 id="org9086a18">Build a project</h4>
<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
cfbs build
:
</code></pre>
</div>
</section>
<section id="slide-org244a834">
<h3 id="org244a834"><code>cf-locate</code></h3>
<dl>
<dt><code>cf-locate</code></dt><dd>Command line tool to help locate and optionally display a body
or bundle within a policy</dd>

</dl>

<aside class="notes">
<p>
Ever read a policy and see a body that you want to understand more?
</p>

<p>
Try it with <code>cf-locate scoped_classes_generic -f /path_to_masterfiles</code>
</p>

</aside>

</section>
<section id="slide-org23f497e">
<h4 id="org23f497e">Installing <code>cf-locate</code></h4>
<p>
It's a perl script and you will need <code>File::HomeDir</code>.
</p>

<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
sudo apt install libfile-homedir-perl
curl https://raw.githubusercontent.com/cfengine/core/master/contrib/cf-locate/cf-locate --output ~/.local/bin/cf-locate
chmod 700 ~/.local/bin/cf-locate
:
</code></pre>
</div>

</section>
<section id="slide-org6354e49">
<h4 id="org6354e49">Using cf-locate</h4>
<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
~/.local/bin/cf-locate results | ansi2txt
:
</code></pre>
</div>

<pre class="example">
-&gt; body or bundle matching 'results' found in /home/nickanderson/.cfagent/inputs/failsafe.cf:463
body classes failsafe_results(scope, class_prefix)
-&gt; body or bundle matching 'results' found in /home/nickanderson/.cfagent/inputs/lib/common.cf:225
body classes results(scope, class_prefix)
-&gt; body or bundle matching 'results' found in /home/nickanderson/.cfagent/inputs/lib/common.cf:322
body classes diff_results(scope, x)
</pre>

</section>
<section id="slide-orgb8c184c">
<h3 id="orgb8c184c"><code>masterfiles-stage</code></h3>
<ul>
<li>Maintain multiple checkouts of policy sets.</li>

</ul>

<aside class="notes">
<ul>
<li>Useful for implementing policy channels</li>
<li>Installed with CFEngine Enterprise Hub</li>

</ul>

</aside>

</section>
</section>
<section>
<section id="slide-org90e6625">
<h2 id="org90e6625">Client/Server Architecture</h2>

<div id="org9400669" class="figure">
<p><img src="data/66/fd45c5-3f73-49e4-a938-ec3ecbdcd8ef/2020-02-18_11-34-56_ClientServerArchitecture.png" alt="2020-02-18_11-34-56_ClientServerArchitecture.png" width="800" />
</p>
</div>

</section>
<section id="slide-org249cc45">
<h3 id="org249cc45">Client Server Communications</h3>
<ul>
<li>Utilizes port 5308 (<code>grep 5308 /etc/services</code>)</li>
<li>Encrypted (TLS)</li>
<li>Public key authentication (<b>key exchange required</b>)</li>
<li>Agents download policy from hub</li>
<li>Hub downloads reports from remote agents</li>

</ul>

<aside class="notes">
<ul>
<li>Policy servers typically bootstrap to themselves</li>
<li>SSH-like model (public/private keypair)</li>
<li>There is no Certificate Authority that can be compromised</li>

</ul>

</aside>

</section>
</section>
<section>
<section id="slide-org05c17ce">
<h2 id="org05c17ce">Agent Components</h2>

</section>
<section id="slide-orga80206c">
<h3 id="orga80206c">Agent Components</h3>

<div id="orgbb28ce8" class="figure">
<p><img src="data/21/633eaf-2b0a-4fef-a25f-7760276b0a5d/cfengine_agent_components_diagram_2016-10-15_16-01-34.png" alt="cfengine_agent_components_diagram_2016-10-15_16-01-34.png" />
</p>
</div>

</section>
<section id="slide-org5eb7526">
<h3 id="org5eb7526"><code>cf-hub</code></h3>

<div id="org8e6485e" class="figure">
<p><img src="data/98/b666a6-d302-47e4-b164-b6653bcca1a8/cfengine_agent_components_diagram_cf-hub_2016-10-15_16-03-31.png" alt="cfengine_agent_components_diagram_cf-hub_2016-10-15_16-03-31.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Collects reports from remote agents</li>
<li>Obeys "<code>common control</code>" and "<code>hub control</code>" bodies</li>

</ul>

<aside class="notes">
<ul>
<li>Runs on the Enterprise Hub, talks to cf-serverd on remote agent on port 5308</li>
<li>Collect reports from remote agents</li>
<li>Obeys "<code>common control</code>" and "<code>hub control</code>" bodies</li>

</ul>

</aside>
</section>
<section id="slide-org25f298c">
<h3 id="org25f298c"><code>cf-runagent</code></h3>

<div id="org51d6217" class="figure">
<p><img src="data/9c/2d7c2f-c5e3-47b2-b7df-fdf875f38643/cfengine_agent_components_diagram_cf-runagent_2016-10-15_21-11-14.png" alt="cfengine_agent_components_diagram_cf-runagent_2016-10-15_21-11-14.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Requests invocation of cf-agent on remote hosts</li>
<li>Cannot invoke arbitrary commands</li>
<li>Define classes to modify behavior (<code>--define</code>)</li>
<li>Specify bundlesequence (<code>--remote-bundles</code>)</li>

</ul>

<aside class="notes">
<ul>
<li>Invokes cf-agent on remote hosts
<ul>
<li>Requires established trust</li>
<li>Normally run from server to “ping” the clients</li>

</ul></li>
<li>Normally run on the server to “ping” the clients</li>
<li>Cannot invoke arbitrary commands - just wake up cf-agent</li>
<li>Define classes to modify behavior</li>
<li>Specify bundlesequence (<code>--remote-bundles</code> added in 3.10)</li>

</ul>

</aside>

</section>
<section id="slide-org6f40411">
<h3 id="org6f40411"><code>cf-serverd</code></h3>

<div id="orge22fd02" class="figure">
<p><img src="data/9f/5cf6c5-5e00-49f9-8392-5cec4c2bb9ea/cfengine_agent_components_diagram_cf-serverd_2016-10-15_21-16-21.png" alt="cfengine_agent_components_diagram_cf-serverd_2016-10-15_21-16-21.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Listens for connections on <b>TCP/5308</b></li>
<li>Enforces access control and authentication</li>
<li>Serves files</li>
<li>Serves <code>cf-runagent</code> requests</li>
<li>Serves reports to <code>cf-hub</code></li>
<li>Runs on both server and clients</li>
<li>Evaluates "<code>common</code>" and "<code>server</code>" bundles</li>
<li>Obeys body "<code>server control</code>"</li>

</ul>

<aside class="notes">
<ul>
<li>Listens for connections on <b>TCP/5308</b></li>
<li>Enforces access control and authentication</li>
<li>Serves files</li>
<li>Serves <code>cf-runagent</code> requests</li>
<li>Serves reports to <code>cf-hub</code></li>
<li>Runs on both server and clients</li>
<li>Evaluates "<code>common</code>" and "<code>server</code>" bundles</li>
<li>Obeys body "<code>server control</code>"</li>

</ul>

</aside>

</section>
<section id="slide-org17d9564">
<h3 id="org17d9564"><code>cf-key</code></h3>

<div id="org7939929" class="figure">
<p><img src="data/57/b0a68d-ece6-4ffc-81e3-cc84b6009b35/cfengine_agent_components_diagram_cf-key_2016-10-15_21-18-51.png" alt="cfengine_agent_components_diagram_cf-key_2016-10-15_21-18-51.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Show recent connections</li>
<li>Manage trust of public keys</li>
<li>Generates key pairs</li>
<li>Installs Enterprise License</li>

</ul>

<aside class="notes">
<ul>
<li>Show recent connections</li>
<li>Manage trust of public keys</li>
<li>Generates key pairs</li>
<li>Installs Enterprise License</li>

</ul>

</aside>

</section>
<section id="slide-org3725171">
<h3 id="org3725171"><code>cf-promises</code></h3>

<div id="org1908b19" class="figure">
<p><img src="data/52/bb3c22-18bf-4c80-82ba-0aad82ea1393/cfengine_agent_components_diagram_cf-promises_2016-10-15_21-21-02.png" alt="cfengine_agent_components_diagram_cf-promises_2016-10-15_21-21-02.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Checks Syntax</li>
<li>Dump Syntax (<code>cf-promises --syntax-description</code></li>
<li>Tag Policy Releases (<code>cf-promises --tag-release</code>)</li>
<li>Show first order Variables and Classes (<code>cf-promises --show-vars --show-classes</code></li>

</ul>

<aside class="notes">
<ul>
<li>Checks Syntax</li>
<li>Dump Syntax (<code>cf-promises --syntax-description</code></li>
<li>Tag Policy Releases (<code>cf-promises --tag-release</code>)</li>
<li>Show first order Variables and Classes (<code>cf-promises --show-vars --show-classes</code></li>

</ul>

</aside>

</section>
<section id="slide-orgf2f442d">
<h3 id="orgf2f442d"><code>cf-monitord</code></h3>

<div id="orgb3b972a" class="figure">
<p><img src="data/bc/d33f08-1c02-4d78-b118-a98bf6986040/cfengine_agent_components_diagram_cf-monitord_2016-10-15_21-22-23.png" alt="cfengine_agent_components_diagram_cf-monitord_2016-10-15_21-22-23.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Measures things</li>
<li>Defines <code>mon.*</code> variables</li>
<li>Defines classes based on anomaly detection</li>
<li>Evaluates "<code>common</code>" and "<code>monitor</code>" bundles</li>
<li>Obeys "<code>common control</code>" and "<code>monitor control</code>" bodies</li>

</ul>

<aside class="notes">
<ul>
<li><code>mon.*</code> variables record average, last, and deviation</li>
<li>Anomaly classes <code>ssh_in_high</code>, <code>ssh_out_high_dev3</code></li>
<li>Next &#x2026;. cf-execd</li>

</ul>

</aside>

</section>
<section id="slide-org2608dfe">
<h3 id="org2608dfe"><code>cf-execd</code></h3>

<div id="org4e65b7a" class="figure">
<p><img src="data/3c/3c8cee-7086-4250-9152-21ca5879c2b2/cfengine_agent_components_diagram_cf-execd_2016-10-15_21-24-05.png" alt="cfengine_agent_components_diagram_cf-execd_2016-10-15_21-24-05.png" />
</p>
</div>

</section>
<section>

<ul>
<li>Executes <code>cf-agent</code> periodically</li>
<li>Controls period and splay time</li>
<li>Collects, stores, and sends output</li>
<li>Evaluates "<code>common</code>" bundles</li>
<li>Obeys "<code>executor control</code>" body</li>

</ul>

<aside class="notes">
<ul>
<li>splay time is the amount of time an agent waits before actually doing the scheduled execution</li>
<li>Emails output generated by scheduled command</li>
<li>Next &#x2026; cf-agent</li>

</ul>

</aside>

</section>
<section id="slide-org7435b66">
<h3 id="org7435b66"><code>cf-agent</code></h3>

<div id="orgf3b7725" class="figure">
<p><img src="data/b4/9a887f-6963-4b7c-a131-fcd2c0794be0/cfengine_agent_components_diagram_cf-agent_2016-10-15_21-25-11.png" alt="cfengine_agent_components_diagram_cf-agent_2016-10-15_21-25-11.png" />
</p>
</div>

</section>
<section>

<ul>
<li>The catalyst or instigator of change</li>
<li>Evaluates "<code>agent</code>" and "<code>common</code>" bundles</li>
<li>Obeys "<code>common control</code>" and "<code>agent control</code>" bodies.</li>
<li>By default runs <code>$(sys.default_policy_path)</code>
<ul>
<li>Privileged : <code>/var/cfengine/inputs/promises.cf</code></li>
<li>Unprivileged: <code>~/.cfagent/inputs/promises.cf</code></li>

</ul></li>
<li>Actuates <code>body common control</code> <i>bundlesequence</i> if defined, or bundle <i>__main__</i> or bundle <i>main</i></li>

</ul>

<aside class="notes">
<ul>
<li><code>cf-agent</code> is the agent of change, its the pointy end of the stick, or the dangerous end of the gun.</li>

</ul>
<ul>
<li>This is the component that you will interact with most commonly.</li>

</ul>

</aside>

</section>
<section id="slide-orgcc84d0a">
<h3 id="orgcc84d0a"><code>cf-secret</code></h3>
<ul>
<li>Encrypts and decrypts files using CFEngine keys</li>

</ul>

<aside class="notes">
<ul>
<li>New in 3.16.0, backported to 3.15.2</li>

</ul>

</aside>

</section>
<section id="slide-org344cab9">
<h3 id="org344cab9"><code>cf-check</code></h3>
<ul>
<li>Inspect, validate, and repair embedded databases</li>

</ul>

<pre class="example" id="orgdf8c73e">

cf-check:
	Utility for diagnosis and repair of local CFEngine databases.
	This BETA version of the tool is for testing purposes only.

Commands:
	dump - Print the contents of a database file
	diagnose - Assess the health of one or more database files
	backup - Copy database files to a timestamped folder
	repair - Diagnose, then backup and delete any corrupt databases
	version - Print version information
	help - Print this help menu

Usage:
	$ cf-check &lt;command&gt; [options] [file ...]

Examples:
	$ cf-check dump /var/cfengine/state/cf_lastseen.lmdb
	$ cf-check lmdump -a /var/cfengine/state/cf_lastseen.lmdb
	$ cf-check diagnose
	$ cf-check repair

</pre>

</section>
<section id="slide-org7d3728e">
<h3 id="org7d3728e"><code>cf-net</code></h3>
<ul>
<li>Command line utility for interacting with <code>cf-serverd</code> as a client</li>

</ul>

<pre class="example" id="org4cb3037">
Usage: cf-net [OPTIONS] COMMAND

Options:
  --help        , -h       - Print the help message
  --manpage     , -M       - Print the man page
  --host        , -H value - Server hostnames or IPs, comma-separated (defaults to policy server)
  --debug       , -d       - Enable debugging output
  --verbose     , -v       - Enable verbose output
  --log-level   , -g value - Specify how detailed logs should be. Possible values: 'error', 'warning', 'notice', 'info', 'verbose', 'debug'
  --inform      , -I       - Enable basic information output
  --tls-version , -t value - Minimum TLS version to use
  --ciphers     , -c value - TLS ciphers to use (comma-separated list)

Commands:
  help         - Prints general help or per topic.
                 Usage: cf-net help [command]
  connect      - Checks if host(s) is available by connecting.
                 Usage: cf-net -H 192.168.50.50,192.168.50.51 connect
  stat         - Look at type of file.
                 Usage: cf-net stat masterfiles/update.cf
  get          - Get file from server.
                 Usage: cf-net get masterfiles/update.cf -o download.cf [-jNTHREADS]
			(%d can be used in both the remote and output file paths when '-j' is used)
  opendir      - List files and folders in a directory.
                 Usage: cf-net opendir masterfiles

Website: http://www.cfengine.com
This software is Copyright (C) 2008,2010-present Northern.tech AS.
</pre>

</section>
<section id="slide-orgbc4b412">
<h3 id="orgbc4b412"><code>cf-reactor</code></h3>
<ul>
<li>CFEngine event reaction daemon</li>
<li>Enterprise Hub Specific</li>
<li>Does not read policy</li>

</ul>

</section>
<section id="slide-org14e16f1">
<h3 id="org14e16f1">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>What needs to happen before remote agents can get policy from the hub?</li>

</ul>

<ul class="fragment roll-in">
<li>Where is the policy that the agent runs by default?</li>

</ul>

<ul class="fragment roll-in">
<li>What port needs to be open bidirectionally?</li>

</ul>

<ul class="fragment roll-in">
<li>How does information from client hosts get into the Enterprise Hub Database?</li>

</ul>

<ul class="fragment roll-in">
<li>What is the answer to the ultimate question of life, the universe and everything?</li>

</ul>

<aside class="notes">
<dl>
<dt>What needs to happen before remote agents can get policy from the hub?</dt><dd>Establish Trust</dd>
<dt>Where is the policy that the agent runs by default?</dt><dd><code>$(sys.default_policy_path)</code> , <code>/var/cfengine/inputs/promises.cf</code>, <code>/var/cfengine/inputs</code>, or <code>$(sys.inputdir)</code></dd>
<dt>What port needs to be open bidirectionally?</dt><dd><b>5308</b></dd>
<dt>How does information from client hosts get into the Enterprise Hub Database?</dt><dd>They are collected by cf-hub. Hub initiated collection, Client initiated advertisement of availability.</dd>
<dt>What is the answer to the ultimate question of life, the universe and everything?</dt><dd><b>42</b>.  In The Hitchhiker's Guide to the Galaxy by Douglas Adams, is the "Answer to the Ultimate Question of Life, the Universe, and Everything", calculated by a supercomputer named Deep Thought over a period of 7.5M years.</dd>

</dl>

</aside>

</section>
</section>
<section>
<section id="slide-org284c469">
<h2 id="org284c469">MPF &amp; stdlib</h2>
<p>
The default "Masterfiles"
</p>

<aside class="notes">
<p>
The backbone of your policy, it's the scaffolding from which you can build on.
</p>
<ul>
<li>When upgrading CFEngine, this is <b>typically upgraded first</b>.</li>

</ul>

</aside>

</section>
<section id="slide-org4b58232">
<h3 id="org4b58232">Overview</h3>
<ul>
<li><code>promises.cf</code></li>
<li><code>update.cf</code></li>
<li><code>standalone_self_upgrade.cf</code></li>
<li><code>lib/*</code></li>
<li><code>cfe_internal/*</code></li>
<li><code>controls/*</code></li>
<li><code>inventory/*</code></li>
<li><code>templates/*</code></li>

</ul>

<aside class="notes">
<p>
While you can and on occasion may need to modify vendored policy, it's generally best to keep all custom policies separate from vendored files.
</p>

<ul>
<li><b>promises.cf</b> is the main entry. This is the first file the agent reads by default. This is the stem cell for the rest of your policy.</li>
<li><b>update.cf</b> is a separate <b>standalone</b> policy to manage updating policy and the cfengine agent itself.</li>
<li><b>standalone_self_upgrade.cf</b> Is a separate <b>standalone</b> policy which is typically executed as a sub-agent by <code>update.cf</code> and is responsible for upgrading the cfengine binaries.</li>
<li><b>lib/</b> Is the standard library (previously referred to as Common Open Promise Bundle|Body Libray (COPBL). Contains commonly used promise bundles and bodies for things like editing or copying files and managing services.</li>
<li><b>cfe_internal/</b> contains policies related to managing cfengine itself.</li>
<li><b>controls/</b> contains bodies that control CFEngine's behavior.</li>
<li><b>inventory/</b> contains policies that extract useful details from the system into variables.</li>
<li><b>templates/</b> contains templates, accessible via <code>def.template_dir</code> from policy, and <code>templates</code> <code>cf-serverd</code> shortcut.</li>

</ul>

</aside>

</section>
<section id="slide-org3966ea4">
<h3 id="org3966ea4">User Entries</h3>
<ul>
<li><code>$(sys.workdir)/data/host_specific.json</code> (<b>Augments</b>)</li>
<li><code>def.json</code> (<b>Augments</b>)</li>
<li><code>services/*.cf</code></li>
<li><code>services/main.cf</code></li>
<li><code>services/autorun/*.cf</code></li>
<li><code>CUSTOM_DIRECTORY/*.cf</code></li>

</ul>

<aside class="notes">
<p>
While you can and on occasion may need to modify vendored policy, it's generally best to keep all custom policies separate from vendored files.
</p>

<dl>
<dt>$(sys.workdir)/data/host_specific.json</dt><dd>The first <i>Augments</i> file (not vendored)</dd>
<dt><code>def.json</code></dt><dd>Relative to policy entry!</dd>
<dt><code>services/*.cf</code></dt><dd>A directory structure for custom policies.</dd>
<dt><code>services/main.cf</code></dt><dd>A place to hook in custom policy (vendored, but minimal)</dd>
<dt><code>services/autorun/*.cf</code></dt><dd>Policy files that get automatically added to inputs if the class <code>services_autorun</code> is defined</dd>
<dt><code>CUSTOM_DIRECTORY/*.cf</code></dt><dd>It's common that <i>all</i> custom policy files are contained within their own directory, commonly named for the organization at the top level of the policy set.</dd>

</dl>

</aside>

</section>
<section id="slide-org87b7ca2">
<h3 id="org87b7ca2">Unattended Policy Execution Overview</h3>

<div id="orgb48be4b" class="figure">
<p><img src="images/MPF-policy-execution-high-level.png" alt="MPF-policy-execution-high-level.png" />
</p>
</div>

</section>
<section id="slide-org1d64872">
<h3 id="org1d64872">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>What is the <i><b>MPF</b></i>?</li>

</ul>

<ul class="fragment roll-in">
<li>Where do you configure <i>most</i> MPF tunables?</li>

</ul>

<ul class="fragment roll-in">
<li>At what point in the Upgrade Process should the MPF be upgraded?</li>

</ul>

<aside class="notes">
<dl>
<dt>What is the <i><b>MPF</b></i>?</dt><dd>The <i><b>Masterfiles Policy Framework</b></i>. The default policy set.</dd>
<dt>Where do you configure <i>most</i> MPF tunables?</dt><dd>Augments</dd>
<dt>At what point in the Upgrade Process should the MPF be upgraded?</dt><dd>First</dd>

</dl>

</aside>

</section>
</section>
<section>
<section id="slide-org8e795d9">
<h2 id="org8e795d9">Promise Theory</h2>
<div class="column" style="float:left; width:70%">

<div id="orga3dc3d3" class="figure">
<p><img src="images/promise_theory_cover.jpg" alt="Promise Theory Principles and Appications" style="border:none;" />
</p>
</div>
</div>

<div class="column" style="float:right; width:30%">
<p>
A model of <b>voluntary cooperation</b> between individual autonomous actors.
</p>
</div>

<aside class="notes">
<p>
The fundamental underlying philosophy that CFEngine is based on.
</p>

</aside>

</section>
<section id="slide-org0ac8530">
<h3 id="org0ac8530">Promises</h3>
<div class="column" style="float:left; width:30%">

<div id="org74a2a31" class="figure">
<p><img src="images/thinking_in_promises_book_cover.jpg" alt="Thinking in Promises" style="border:none;" />
</p>
</div>
</div>

<div class="column" style="float:right; width:70%">
<ul>
<li>A promise is a <b>statement of intent</b></li>
<li>Agents can only make promises about themselves</li>

</ul>
</div>

<aside class="notes">
<ul>
<li>The webserver process promises to be running</li>
<li>The file promises to have specific permissions</li>

</ul>

</aside>

</section>
<section id="slide-org7f17a77">
<h3 id="org7f17a77">Basic Concepts</h3>
<video controls width="800" data-src="./images/Promise-Theory-Basic-Concepts-part-1.mp4"></video>

<p>
<a href="https://www.youtube.com/watch?v=2TPsB5WuZgk">https://www.youtube.com/watch?v=2TPsB5WuZgk</a>
</p>

</section>
</section>
<section>
<section id="slide-orgc7f1845">
<h2 id="orgc7f1845">Language</h2>

</section>
<section id="slide-org0bad0ae">
<h3 id="org0bad0ae">Promise outcomes/results</h3>
<ul>
<li><code>kept</code></li>
<li><code>repaired</code></li>
<li><code>not_kept</code>
<ul>
<li><code>failed</code></li>
<li><code>denied</code></li>
<li><code>timeout</code></li>

</ul></li>

</ul>

</section>
<section>

<p>
<b>Note:</b> Compound promises <b>can</b> have <b>multiple outcomes</b> at the same time
(<i>not_kept</i> &amp; <i>kept</i> &amp; <i>repaired</i>).
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >files:
  "/mnt/volume/file.txt"
    create =&gt; "true",
    perms =&gt; m( 777 ),
    edit_line =&gt; lines_present( "Hello World $(sys.date)" ),
    edit_defaults =&gt; empty;
</code></pre>
</div>

<aside class="notes">
<ul>
<li>Imagine a file that exists with mode 600, yesterdays date, and sits on a full disk.</li>

<li id="kept"><i>create =&gt; "true"</i>, is satisfied, so the promise is kept</li>
<li id="repaired"><i>perms =&gt; m(777)</i> is fixed, so the promise is repaired</li>
<li id="not_kept">The file content is incorrect, but because the file system is full, we can't write a new file and replace the bad one, so promise not_kept</li>

</ul>

</aside>

</section>
<section id="slide-orgf891ae1">
<h3 id="orgf891ae1">Promise types</h3>
<p>
access, build_xpath, classes, <b>commands</b>, databases, defaults, delete_attribute, delete_lines, delete_text, delete_tree, field_edits, <b>files</b>, guest_environments, insert_lines, insert_text, insert_tree, measurements, meta, methods, <b>packages</b>, processes, replace_patterns, reports, roles, <b>services</b>, set_attribute, set_text, storage, users, vars
</p>

<aside class="notes">
<p>
As of 3.18.0, there are 30 different built-in promise types. The promise type available depend on the type of bundle used.
Note: Custom promise types are not listed in the syntax description.
</p>

</aside>

</section>
<section id="slide-org776ea7f">
<h4 id="org776ea7f">Custom Promise Types</h4>
<ul>
<li>Available starting with 3.17.0</li>
<li>Can be written in any language</li>
<li>Bash and Python libraries available</li>

</ul>

</section>
<section id="slide-org86e21f3">
<h3 id="org86e21f3">Syntax Structure</h3>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle type name
{
  promise_type:

    context::

      "promiser" -&gt; { "optional", "stakeholder" }
        handle =&gt; "unique_promise_identifier",
        depends_on =&gt; { "handles", "must_be_kept_or_repaired_first" },
        attribute_1 =&gt; value_1,
        attribute_2 =&gt; value_2,
        meta =&gt; { "tag1", "tag2", "tag3=something" },
        comment =&gt; "Why important";
}

body attribute_N name(optional)
{
    context::
      attribute_N_1 =&gt; "value";
      attribute_N_2 =&gt; { "value" };
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>Promise type: What kind? For example packages, or commands</li>
<li>Context: When/Where? For example prod Linux hosts in north America on
Sundays at GMT 1700</li>
<li>Promiser: What. For example the httpd package, or the name of a command.</li>
<li>Stakeholders: Who Cares. For example Security Department, a specific policy
or compliance id CIS-1.1.17, another promise, a ticketing system identifier.</li>
<li>Attributes: How/Details. For example should the package be present or absent
on the system? Should the command be executed inside of a shell, jailed
withing a specific directory, or run as a specific user?</li>
<li>Why: Why is this important? What can go wrong if this is not in place.
Visible in verbose logs.</li>

</ul>

</aside>
</section>
<section id="slide-org92d1c4a">
<h3 id="org92d1c4a">Bundles</h3>
<ul>
<li>Collection of logically related promises</li>
<li>Are <b>not functions</b></li>
<li>Can take parameters</li>
<li>Maintain <i>some</i> variable state</li>
<li>Can return values</li>

</ul>

<aside class="notes">
<p>
A <a href="https://docs.cfengine.com/latest/guide-language-concepts-bundles.html"><b>bundle</b></a> is a collection of promises. It is a logical grouping of any number
of promises, usually for a common purpose. Bundles can optionally take
parameters. Check out the documentation on <a href="https://docs.cfengine.com/latest/guide-writing-and-serving-policy-bundles-best-practices.html">best practices with bundles</a>.
</p>

<ul>
<li>Bundles can be used <i>like</i> functions. However, please note they maintain
some state from thier last actuation.
<ul>
<li>Strings, lists, and data containers contain last value and may be
re-defined.</li>
<li>Classic arrays are cleared at the <b>beginning</b> of each bundle actuation.</li>
<li>Bundle scoped classes do not persist</li>

</ul></li>

</ul>

</aside>

</section>
<section id="slide-orgf14cf4c">
<h4 id="orgf14cf4c">Example bundles hold <i>some</i> state</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/example-bundles-maintain-some-variable-state.cf</code></label>
<pre id="example-bundles-maintain-some-variable-state.cf"><code class="cfengine3" >bundle agent main
{
  methods:
      "" usebundle =&gt; set_item_in_bag( "hammer", "slightly damaged");
      "" usebundle =&gt; set_item_in_bag( "pickaxe", "perfect");
      "" usebundle =&gt; set_item_in_bag( "flask", "half full");
      "" usebundle =&gt; report_bag_contents;
  reports:
    "$(with)" with =&gt; join( ", ", getindices( "set_item_in_bag.array" ) );
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent set_item_in_bag(item, condition)
{
  vars:
    "$(item)" string =&gt; "$(condition)";
    "array[$(item)]" string =&gt; "$(condition)";
}
bundle agent report_bag_contents
{
  vars:
    "l" slist =&gt; variablesmatching("default:set_item_in_bag\..*");
    "a[$(l)]" string =&gt; nth( string_split( "$(l)", "\.", 2 ), 1);
  reports:"You look in the bag and see ...."; "A $($(l)) $(a[$(l)])";
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="sh" >exec 2&gt;&amp;1
cf-agent -Kf ./examples/example-bundles-maintain-some-variable-state.cf
:
</code></pre>
</div>

<pre class="example">
R: You look in the bag and see ....
R: A slightly damaged hammer
R: A perfect pickaxe
R: A half full array[flask]
R: A half full flask
R: flask
</pre>


<aside class="notes">
<ul>
<li>Strings, lists, and data containers contain last value and may be re-defined.</li>
<li>Classic arrays are cleared at the <b>beginning</b> of each bundle actuation, <code>set_item_in_bag</code>.
<ul>
<li><i>flask</i> was the last $(item) used to define a classic array.</li>
<li>Since it has not yet been actuated again, it persists.</li>

</ul></li>

</ul>

</aside>

</section>
<section id="slide-orgcaae9ee">
<h4 id="orgcaae9ee">Bundles for logical abstraction</h4>
<p>
For example, a bundle to configure Apache might:
</p>

<ul>
<li>install the <code>apache2</code> package</li>
<li>edit the configuration file</li>
<li>copy the web server content</li>
<li>configure file-system permissions</li>
<li>ensure the httpd process is running</li>
<li>restart the httpd process when necessary</li>

</ul>

</section>
<section id="slide-org41d72a6">
<h4 id="org41d72a6">Bundle types</h4>
<div class="org-src-container">

<pre><code class="sh" >cf-promises --syntax-description json | jq '.bundleTypes | keys[]'
</code></pre>
</div>

<dl>
<dt><a href="https://docs.cfengine.com/latest/guide-language-concepts-normal-ordering.html*agent-normal-ordering"><code>agent</code></a></dt><dd>evaluated by <code>cf-agent</code></dd>
<dt><a href="https://docs.cfengine.com/latest/guide-language-concepts-bundles.html*common-bundles"><code>common</code></a></dt><dd>evaluated by <b>all</b> components</dd>
<dt><a href="https://docs.cfengine.com/latest/reference-promise-types-edit_line.html"><code>edit_line</code></a></dt><dd>evaluated by <code>cf-agent</code> for files type promises</dd>
<dt><a href="https://docs.cfengine.com/latest/reference-promise-types-edit_xml.html"><code>edit_xml</code></a></dt><dd>evaluated by <code>cf-agent</code> for files type promises</dd>
<dt><a href="https://docs.cfengine.com/latest/guide-language-concepts-normal-ordering.html*server-normal-ordering"><code>monitor</code></a></dt><dd>evaluated by <code>cf-monitord</code></dd>
<dt><a href="https://docs.cfengine.com/latest/guide-language-concepts-normal-ordering.html*server-normal-ordering"><code>server</code></a></dt><dd>evaluated by <code>cf-serverd</code></dd>

</dl>

<aside class="notes">
<p>
Bundles have a type which specify how they can be used.
</p>

</aside>

</section>
<section id="slide-org587450d">
<h4 id="org587450d">Bundlesequence</h4>
<ul>
<li><code>main</code> is the default</li>
<li><code>__main__</code> is treated as <i>main</i> if in <code>$(sys.policy_entry_filename)</code></li>

</ul>

<div class="org-src-container">
<label class="org-src-name">examples/bundle__main__.cf</label>
<pre><code class="cfengine3" >bundle agent hello_world
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods: "hello_world";
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>main is great for example snippets</li>
<li><code>__main__</code> is great for polices that are standalone, but can be integrated</li>

</ul>

</aside>

</section>
<section id="slide-orgd0dcf76">
<h3 id="orgd0dcf76">Bodies</h3>
<ul>
<li>Collection of attributes</li>
<li>Have a type ( e.g. <code>classes</code>, <code>perms</code>, <code>copy_from</code> )</li>
<li>Can take parameters</li>
<li>Can be inherited (3.8+)</li>
<li>Can be <i>defaulted</i> for a given promise <i>type</i> (3.9+)</li>
<li>Can be <i>custom</i> (with a custom promise type) (3.20)</li>

</ul>

<p>
There are <a href="https://docs.cfengine.com/latest/reference-all-types.html*all-body-types"><b>41</b></a> built-in body types as of 3.21.0
</p>

<aside class="notes">
<ul>
<li>Body types map to promise attribute names, the Left Hand Side (LHS) of the hasrocket <code>=&gt;</code> also called "Fat comma" or "Fat arrow"</li>

</ul>

</aside>

</section>
<section>

<div class="org-src-container">

<pre><code class="sh" >cf-promises --syntax-description json | jq '.bodyTypes | keys |join(", ") '
</code></pre>
</div>

<p>
acl, action, agent, changes, classes, common, contain, copy_from, database_server, delete, delete_select, depth_search, edit_defaults, edit_field, environment_interface, environment_resources, executor, file, file_select, hub, insert_select, link_from, location, match_value, monitor, mount, package_method, package_module, password, perms, printfile, process_count, process_select, rename, replace_with, report_data_select, runagent, select_region, server, service_method, volume
</p>

</section>
<section id="slide-org4369c6c">
<h4 id="org4369c6c">Special bodies that control agent behavior</h4>
<ul>
<li>body common control</li>
<li>body file control</li>
<li>body agent control</li>
<li>body server control</li>
<li>body executor control</li>
<li>body hub control</li>

</ul>

<aside class="notes">
<dl>
<dt>body common control</dt><dd>Affects behavior of all components. Files to parse, bundlesequence</dd>
<dt>body file control</dt><dd>Controls parsing behavior. Files to include, namespaces</dd>
<dt>body agent control</dt><dd></dd>

<dt>(no term)</dt><dd>body server control</dd>
<dt>(no term)</dt><dd>body executor control</dd>
<dt>(no term)</dt><dd>body hub control</dd>

</dl>

</aside>

</section>
<section id="slide-orgea5070a">
<h4 id="orgea5070a">Default bodies</h4>
<aside class="notes">
<p>
3.9 introduced the ability to define a body that is used by all occurances of a
given promise type unless otherwise specified.
</p>

<p>
For example, to set all file type promises to warn you can add the
<code>files_action</code> body in the <code>bodydefault</code> namespace.
</p>

</aside>

<div class="org-src-container">
<label class="org-src-name"><code>examples/default-bodies.cf</code></label>
<pre id="=examples/default-bodies.cf="><code class="cfengine3" >bundle agent main
{
  files:
    "/tmp/show_default_action"
      create =&gt; "true";

    "/tmp/show_explicit_action"
      create =&gt; "true",
      action =&gt; fix;
}

body action fix
{
  action_policy =&gt; "fix";
}

body file control
{
  namespace =&gt; "bodydefault";
}
body action files_action
{
  action_policy =&gt; "warn";
}
</code></pre>
</div>

</section>
<section>

<pre class="example">
warning: Warning promised, need to create file '/tmp/show_default_action'
   info: Created file '/tmp/show_explicit_action', mode 0600
</pre>

</section>
<section id="slide-orgcb5b2b8">
<h3 id="orgcb5b2b8">Normal Order</h3>
<ul>
<li>The order in which CFEngine executes <b>promises</b>

<ul>
<li><code>classes</code> and <code>vars</code> are evaluated during <a href="https://docs.cfengine.com/docs/3.7/guide-language-concepts-normal-ordering.html*cf-promises-policy-validation-step">policy parsing</a> and <a href="https://docs.cfengine.com/docs/3.7/guide-language-concepts-normal-ordering.html*agent-pre-evaluation-step">pre-eval</a> (depending on the bundle type)</li>
<li>Promises are evaluated from top to bottom respecting class restrictions</li>
<li>Bundles listed in the bundlesequence or activated via methods are given 3 pass evaluation</li>

</ul></li>

</ul>

</section>
<section id="slide-orgf7dbccd">
<h4 id="orgf7dbccd">Example:</h4>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent illustrating_normal_order
{
   vars:
     "color1" string =&gt; "red";

   reports:
     "$(color1)+$(color2) = Purple";

   vars:
     "color2" string =&gt; "blue";
}
</code></pre>
</div>

<pre class="example">
# cf-agent --bundlesequence illustrating_normal_order --no-lock --log-level info --file illustrating_normal_oder.cf
    info: Using command line specified bundlesequence
R: red+blue = Purple
</pre>


</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent illustrating_normal_order
{
   vars:
     "color1" string =&gt; "red";
     "color2" string =&gt; "blue";

   reports:
     "$(color1)+$(color2) = Purple";
}
</code></pre>
</div>

<pre class="example">
# cf-agent --bundlesequence illustrating_normal_order --no-lock --log-level info --file illustrating_normal_oder2.cf
    info: Using command line specified bundlesequence
R: red+blue = Purple
</pre>

</section>
<section id="slide-orgf0f2419">
<h3 id="orgf0f2419">Convergence</h3>
<ul>
<li>A basic principal of CFEngine</li>
<li><p>
cf-agent will perform three passes over each bundle explicitly actuated
</p></li>

</ul>

<div id="orgaee4fb9" class="figure">
<p><img src="./images/2020-10-28_14-14-05_convergence.png" alt="2020-10-28_14-14-05_convergence.png" />
</p>
</div>

<aside class="notes">
<ul>
<li>You don't have to leave the system in the desired state on the first pass.
<ul>
<li>Make changes incrementally, getting closer to the objective</li>

</ul></li>
<li>Advantage: You don't need to know the current state of the system in order to correct it</li>

</ul>

</aside>
</section>
<section id="slide-org3619d00">
<h3 id="org3619d00">Augments (<code>host_specific.json</code>, <code>def.json</code>)</h3>
<ul>
<li>Very early definition</li>
<li><code>host_specific.json</code> processed first (if present), variables defined here have precedence over other augments</li>
<li><code>def.json</code> Loaded if found next to <code>$(sys.policy_entry_filename)</code></li>
<li>Classes based on system discovery (platform/networks/arch)</li>
<li>Facilitates delegation of control</li>

</ul>

<aside class="notes">
<ul>
<li>This is one of the best ways to integrate with a CMDB</li>
<li>Variables can be defined in any namespace/bundle as of 3.18.0, prior to that vars could only be defined in <code>default:def</code> bundle scope.</li>

</ul>

</aside>

</section>
<section id="slide-orgae0f7db">
<h4 id="orgae0f7db">Example augments</h4>
<aside class="notes">
<ul>
<li>Syntax pre-3.18 determines how based on suffix of each entry (presence or lack of <code>::</code>)</li>
<li>Syntax 3.18.0+ is more explicit, supports comments and tags</li>
<li>Define <code>by_regular_expression</code> if the class <code>ubuntu_X</code> is defined, where <code>X</code> one or more is an integers.</li>
<li>Define <code>by_class_expression</code> if the class <code>nickanderson_thinkpad_w550s</code> is defined and it's a .</li>

</ul>

</aside>

<ul class="org-ul">
<li><a id="org71b54db"></a>Simple syntax<br />
<div class="org-src-container">
<label class="org-src-name"><code>examples/augments/def.json</code></label>
<pre id="examples/augments/def.json"><code class="json" >{
  "classes": {
      "by_regular_expression": [ "ubuntu_\\d+" ],
      "by_class_expression": [ "(Afternoon|Evening).(Monday|Wednesday|Friday)::" ],
  },
  "vars": {
      "myvar1": "defined from augments",
      "myvar2": "defined from augments"
    }
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>Supported since 3.7.3?</li>

</ul>

</aside>
</li>

<li><a id="orga107d37"></a>Advanced syntax<br />
<aside class="notes">
<ul>
<li>Available since 3.18.0</li>

</ul>

</aside>

<ul class="org-ul">
<li><a id="org54dd8c5"></a>classes<br />
<div class="org-src-container">
<label class="org-src-name"><code>examples/augments_2_classes/def.json</code></label>
<pre id="examples/augments_2_classes/def.json"><code class="json" >{
  "classes": {
      "by_regular_expression": {
          "regular_expressions": [ "ubuntu_\\d+" ],
          "comment": "My Comment",
          "tags": ["optional", "tags" ]
      }
      "by_class_expression": {
          "class_expressions": [ "(Afternoon|Evening).(Monday|Wednesday|Friday)::" ],
            "comment": "My Comment",
            "tags": ["optional", "tags" ]
        }
  },
  "vars": {
      "myvar2": "defined from augments",
      "default:def.myvar1": "defined from augments",
      "yourNamespace:Bundle2.myvar2": "defined from augments"
    }
}
</code></pre>
</div>
</li>

<li><a id="org17f479a"></a>vars/variables<br />
<div class="org-src-container">
<label class="org-src-name"><code>examples/augments_2/def.json</code></label>
<pre id="examples/augments_2_vars/def.json"><code class="json" >{
  "vars": {
      "myvar2": "default:def.myvar2 defined from augments",
      "default:def.myvar1": "default:def.myvar1 defined from augments",
      "yourNamespace:Bundle2.myvar2": "yourNamespace:Bundle2.myvar defined from augments"
    }
    "variables": {
      "myvar2": {
          "value": "data:main.myvar2 defined from augments",
          "comment": "My notes",
          "tags": [ "inventory", "attribute_name=Something" ]
        },
       "example2.myvar3": {
          "value": "data:example2.myvar3 defined from augments",
        },
        "yourNamespace:example2.myvar2": {
          "value": "yourNamespace:example2.myvar4 defined from augments, variables key has precedence"
        },
    }
}
</code></pre>
</div>
</li>
</ul>
</li>
</ul>

</section>
<section id="slide-orge368d76">
<h4 id="orge368d76">Example policy using augments</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/augments/augments.cf</code></label>
<pre id="examples/augments/augments.cf"><code class="cfengine3" >bundle agent main
{
  reports:
    "I defined '$(const.dollar)(def.myvar1)' as '$(def.myvar1)'";

    by_regular_expression::
      "Define classes from augments based on a regular expression";

    by_class_expression::
      "Define classes from augments based on CFEngine class expressions";

}
</code></pre>
</div>

</section>
<section id="slide-org90a2dad">
<h4 id="org90a2dad">Example output</h4>
<div class="org-src-container">

<pre><code class="sh" >cf-agent --no-lock --file ./examples/augments/augments.cf
</code></pre>
</div>

<pre class="example">
R: I defined '$(def.myvar1)' as 'defined from augments'
R: Define classes from augments based on a regular expression
R: Define classes from augments based on CFEngine class expressions
</pre>

</section>
<section id="slide-orga3a96f9">
<h4 id="orga3a96f9">Policy always wins!</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/augments/augments-policy-wins.cf</code></label>
<pre id="examples/augments/augments-policy-wins.cf"><code class="cfengine3" >bundle common def
{
  vars:
    "myvar1" string =&gt; "Defined in policy";
    "myvar2"
      string =&gt; "Defined in policy",
      if =&gt; not( isvariable( myvar2 ) );
}
bundle agent main
{
  reports:
    "I defined '$(const.dollar)(def.myvar1)' as '$(def.myvar1)'";
    "I defined '$(const.dollar)(def.myvar2)' as '$(def.myvar2)'";

    by_regular_expression::
      "Define classes from augments based on a regular expression";

    by_class_expression::
      "Define classes from augments based on CFEngine class expressions";
}
</code></pre>
</div>

<aside class="notes">
<p>
Here, we define <code>def.myvar1</code> directly in policy, and we define <code>def.myvar2</code> if it's not already defined (i.e. set via augments).
</p>

</aside>

</section>
<section id="slide-org2dab5c0">
<h4 id="org2dab5c0">Example output</h4>
<div class="org-src-container">

<pre><code class="sh" >cf-agent --no-lock --file ./examples/augments/augments-policy-wins.cf
</code></pre>
</div>

<pre class="example">
R: I defined '$(def.myvar1)' as 'Defined in policy'
R: I defined '$(def.myvar2)' as 'defined from augments'
R: Define classes from augments based on a regular expression
R: Define classes from augments based on CFEngine class expressions
</pre>

</section>
<section id="slide-org3a66add">
<h4 id="org3a66add">Multiple augments</h4>
<p>
Merge more augments on top.
</p>

<aside class="notes">
<p>
Here we merge a more specific augments for linux (the value derived from sys.os on top of the default.
</p>

<p>
cf-agent will error if listed augnets file does not exist!
</p>


<p>
root@demohub:/tmp# cf-agent -KIf ./t.cf
   error: Could not load requested further augments from file '\((sys.policy_entry_dirname)/\)(sys.os_release[DEPARTMENT]).json'
   error: Could not load requested further augments from file '\((sys.policy_entry_dirname)/\)(sys.os_release[DEPARTMENT]).json'
R: Defined in augments
</p>

</aside>

<div class="org-src-container">
<label class="org-src-name"><code>examples/augments-multiple/def.json</code></label>
<pre><code class="json" >{
  "vars": {
      "myvar1": "defined from augments for all",
      "myvar2": "defined from augments for all"
    },
  "augments": [ "$(sys.policy_entry_dirname)/$(sys.os).json" ]
}
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name"><code>examples/augments-multiple/linux.json</code></label>
<pre><code class="json" >{
  "vars": {
      "myvar2": "override for linux hosts"
    }
}
</code></pre>
</div>

</section>
<section id="slide-org823b67b">
<h4 id="org823b67b">Multiple augments: Example policy</h4>
<aside class="notes">
<p>
Here we simply report the variable values to illustrate how the value of myvar2 was overridden
</p>

</aside>

<div class="org-src-container">
<label class="org-src-name"><code>examples/augments-multiple/promises.cf</code></label>
<pre id="examples/augments-multiple/promises.cf"><code class="cfengine3" >bundle agent main
{
  reports:
    "'$(const.dollar)(def.myvar1)' is '$(def.myvar1)'";
    "'$(const.dollar)(def.myvar2)' is '$(def.myvar2)'";
}
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="sh" >cf-agent --no-lock --file ./examples/augments-multiple/promises.cf
</code></pre>
</div>

<pre class="example">
R: '$(def.myvar1)' is 'defined from augments for all'
R: '$(def.myvar2)' is 'override for linux hosts'
</pre>

</section>
<section id="slide-org24e5def">
<h3 id="org24e5def">Macros</h3>
<ul>
<li><a href="https://docs.cfengine.com/docs/master/reference-macros.html">Conditional parsing</a> based on version and features</li>
<li>Use for supporting future syntax, speed optimizations</li>

</ul>

</section>
<section id="slide-orge597536">
<h4 id="orge597536">Version based</h4>
<ul>
<li><code>minimum_version</code></li>
<li><code>maximum_version</code></li>
<li><code>at_version</code></li>
<li><code>between_versions</code></li>
<li><code>before_version</code></li>
<li><code>after_version</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/macros-if-minimum_version.cf</code></label>
<pre id="=examples/macros-if-minimum_version.cf="><code class="cfengine3" >bundle agent example_macro_minimum_version
{
@if minimum_version(4.0.0)
  This contains completely invalid syntax, but it's OK.
  Only versions 4 and greater will evaluate this section.
@endif
@if minimum_version(3.14.0)
      # the function `classfiltercsv()` was introduced in 3.14.0
  vars:
      "container"  data =&gt; classfiltercsv( $(file), # File
                                           true, # Has header
                                           0, # Class column
                                           2); # Optional sort column
@endif
}
</code></pre>
</div>

</section>
<section id="slide-org9947925">
<h4 id="org9947925">Feature based</h4>
<ul>
<li><a href="https://docs.cfengine.com/docs/3.10/reference-macros.html#features">Feature Macro</a> documentation</li>

</ul>

<p>
You can conditionally parse policy based on compiled in features using this
macro.
</p>

<div class="org-src-container">
<label class="org-src-name"><code>examples/macros-if-feature-yaml.cf</code></label>
<pre id="=examples/macros-if-feature-yaml.cf="><code class="cfengine3" >bundle agent main
{
@if feature(yaml)
# the yaml library may not be compiled in
  vars: "container" data =&gt; parseyaml('
- array1
- array2
- key: 1
- key: 2');
@endif

  reports:
    "$(with)" with =&gt; string_mustache('{{%-top-}}', container );
}
</code></pre>
</div>

</section>
<section id="slide-org2aca3ca">
<h4 id="org2aca3ca">Else</h4>
<ul>
<li>Must come <i>after</i> an <code>@if</code> macro</li>

</ul>

<pre class="example" id="org369ffde">
bundle agent extractor
{
@if minimum_version(3.16)
  # Implementation for 3.16+
  vars:
    "container"
      data =&gt; classfiltercsv(...);
@else
  # Implementation for versions before 3.16
  vars:
    "container"
      data =&gt; readcsv(...);
@endif
}
</pre>
</section>
<section id="slide-org8537630">
<h3 id="org8537630">Functions</h3>
<p>
There are 181 functions as of 3.21.0
</p>

</section>
<section id="slide-orgbcbe3f7">
<h3 id="orgbcbe3f7">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>What is a bundle?</li>

</ul>
<ul class="fragment roll-in">
<li>What is the fundamental underlying philosophy that CFEngine is based on?</li>

</ul>
<ul class="fragment roll-in">
<li>When is the next break?</li>

</ul>
<ul class="fragment roll-in">
<li>Which component collects reports from remote agents?</li>

</ul>
<ul class="fragment roll-in">
<li>What types of bundles are there?</li>

</ul>
<ul class="fragment roll-in">
<li>In what order are promises within a bundle processed?</li>

</ul>
<ul class="fragment roll-in">
<li>How can you use new language features when you still have some old agents?</li>

</ul>
<ul class="fragment roll-in">
<li>Which Augments files is loaded <i>first</i>?</li>

</ul>
<ul class="fragment roll-in">
<li>Which language elements can be extended?</li>

</ul>
<ul class="fragment roll-in">
<li>What has the highest precedence when defining variables?</li>

</ul>
<ul class="fragment roll-in">
<li>What has the 2nd highest precedence when defining variables?</li>

</ul>
<ul class="fragment roll-in">
<li>What do augments facilitate?</li>

</ul>
<ul class="fragment roll-in">
<li>How do augments facilitate delegation of control?</li>

</ul>

<aside class="notes">
<dl>
<dt>What is a bundle</dt><dd>A collection of <b>promises</b>, a logical container, a way of abstracting complexity</dd>
<dt>What is the fundamental underlying philosophy that CFEngine is based on?</dt><dd><b>Promise Theory</b></dd>
<dt>What allows you to set classes and define variables <i>very</i> early during agent initialization?</dt><dd>Augments</dd>
<dt>When is the next break?</dt><dd></dd>

<dt>Which component collects reports from remote agents?</dt><dd><b>cf-hub</b></dd>
<dt>What types of bundles are there?</dt><dd><b>common</b>, <b>agent</b>, <b>edit_line</b>, <b>server</b>, <b>monitor</b>, <b>edit_xml</b></dd>
<dt>In what order are promises within a bundle processed?</dt><dd>The <b>Normal Order</b></dd>
<dt>How can you use a new function when you still have some old agents?</dt><dd>Macros!</dd>
<dt>Which Augments files is loaded <i>first</i>?</dt><dd><code>host_specific.json</code></dd>
<dt>Which language elements can be extended?</dt><dd>Promise Types, Bodies</dd>
<dt>What has the highest precedence when defining variables?</dt><dd>Policy</dd>
<dt>What has the 2nd highest precedence when defining variables?</dt><dd><code>host_specific.json</code></dd>
<dt>What do augments facilitate?</dt><dd>Delegation of control</dd>
<dt>How do augments facilitate delegation of control?</dt><dd>Separation of policy and data. Data interface, easy to integrate with other tooling</dd>

</dl>

</aside>

</section>
</section>
<section>
<section id="slide-orgb5ec4d2">
<h2 id="orgb5ec4d2">Making Decisions: Context Classes and Expressions</h2>

</section>
<section id="slide-orgd2f45b2">
<h3 id="orgd2f45b2">Classes</h3>
<ul>
<li>Restrict promises based on context</li>
<li>Usable in bundles and bodies</li>
<li>Used for making decisions</li>
<li>Can be combined with expressions</li>

</ul>

<aside class="notes">
<p>
A promise might only apply to Linux systems on Sundays, when a <a href="https://docs.cfengine.com/latest/guide-language-concepts-variables.html">variable</a> has a
certain value or any other arbitrary condition or combination of various
conditions.
</p>

<ul>
<li>Think in <a href="https://en.wikipedia.org/wiki/Set_%28mathematics%29">sets</a>
<ul>
<li>Try and treat servers like cattle <b>not</b> pets</li>

</ul></li>

</ul>

</aside>

</section>
<section id="slide-orgcf3662b">
<h3 id="orgcf3662b">What classes are defined?</h3>
<div class="org-src-container">
<label class="org-src-name">Before 3 pass evaluation</label>
<pre><code class="shell" >cf-promises --show-classes
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">At the end of a policy run</label>
<pre><code class="shell" >cf-agent --show-evaluated-classes
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">Currently within a policy</label>
<pre><code class="cfengine3" >vars:
  "defined" slist =&gt; classesmatching( ".*" );
</code></pre>
</div>

<aside class="notes">
<p>
Note, show-classes will not show ALL possible classes. It only performs
pre-eval so it is only showing the classes that are defined after pre-eval.
</p>

</aside>

</section>
<section id="slide-orgf68ea72">
<h4 id="orgf68ea72">Example</h4>
<div class="org-src-container">

<pre><code class="shell" >cf-promises --show-classes | tail -n+2 | awk -vORS=", " '{print $1}'
</code></pre>
</div>

<p>
127_0_0_1, 172_17_0_1, 192_168_122_1, 192_168_42_189, 4_cpus, 64_bit, Afternoon, Day23, February, GMT_Day23, GMT_Evening, GMT_February, GMT_Hr18, GMT_Hr18_Q3, GMT_Lcycle_1, GMT_Min30_35, GMT_Min34, GMT_Q3, GMT_Sunday, GMT_Yr2020, Hr12, Hr12_Q3, Lcycle_1, Min30_35, Min34, PK_SHA_43c979e264924d0b4a2d3b568d71ab8c768ef63487670f2c51cd85e8cec63834, Q3, Sunday, Yr2020, any, cfengine, cfengine_3, cfengine_3_15, cfengine_3_15_0, common, compiled_on_linux_gnu, debian, debian_buster, enterprise, enterprise_3, enterprise_3_15, enterprise_3_15_0, enterprise_edition,
</p>

</section>
<section>

<p>
fe80__5ee0_c5ff_fe9f_f38f, feature, feature_curl, feature_def, feature_def_json, feature_def_json_preparse, feature_tls, feature_tls_1, feature_tls_1_0, feature_tls_1_1, feature_tls_1_2, feature_tls_1_3, feature_xml, feature_yaml, ipv4_127, ipv4_127_0, ipv4_127_0_0, ipv4_127_0_0_1, ipv4_172, ipv4_172_17, ipv4_172_17_0, ipv4_172_17_0_1, ipv4_192, ipv4_192_168, ipv4_192_168_122, ipv4_192_168_122_1, ipv4_192_168_42, ipv4_192_168_42_189, ipv4_gw_192_168_42_1, ipv6_fe80__5ee0_c5ff_fe9f_f38f, linux, linux_5_0_0_38_lowlatency, linux_x86_64, linux_x86_64_5_0_0_38_lowlatency, linux_x86_64_5_0_0_38_lowlatency__41_Ubuntu_SMP_PREEMPT_Tue_Dec_3_01_06_41_UTC_2019,
</p>

</section>
<section>

<p>
mac_02_42_fb_b7_c0_59, mac_52_54_00_6b_62_06, mac_5c_e0_c5_9f_f3_8f, my_other_example, net_iface_docker0, net_iface_lo, net_iface_virbr0, net_iface_wlan0, nickanderson_thinkpad_w550s, nova, nova_3, nova_3_15, nova_3_15_0, nova_edition, systemd, test_class_29665402e2b4331f10b8d767b512cd916eeb5db9, test_class_29665402e2b4331f10b8d767b512cd916eeb5db9_2, ubuntu, ubuntu_19, ubuntu_19_04, x86_64,
</p>

</section>
<section id="slide-org15f3753">
<h3 id="org15f3753">Class expressions</h3>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 1:</span> Class Expressions</caption>

<colgroup>
<col  class="org-left" />

<col  class="org-left" />
</colgroup>
<tbody>
<tr>
<td class="org-left"><b>.</b>  (dot)</td>
<td class="org-left"><b>AND</b></td>
</tr>

<tr>
<td class="org-left"><b>&amp;</b>  (ampersand)</td>
<td class="org-left"><b>AND</b></td>
</tr>

<tr>
<td class="org-left"><b>l</b>  (pipe)</td>
<td class="org-left"><b>OR</b></td>
</tr>

<tr>
<td class="org-left"><b>!</b>  (exclamation)</td>
<td class="org-left"><b>NOT</b></td>
</tr>

<tr>
<td class="org-left"><b>()</b> (parenthesis)</td>
<td class="org-left"><b>grouping</b></td>
</tr>
</tbody>
</table>

<ul>
<li>It's more common to use <b><code>.</code></b> than <b><code>&amp;</code></b> to express AND</li>

</ul>

<aside class="notes">
<p>
Classes can be combined into expressions to make complex decisions.
</p>

</aside>

</section>
<section id="slide-orgf5e5ee7">
<h4 id="orgf5e5ee7">Example illustrating class expressions</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-01-using_class_expressions.cf</code></label>
<pre id="examples/00-01-using_class_expressions.cf"><code class="cfengine3" >bundle agent main
{
  files:
    linux.(Sunday|Saturday)::
      "/etc/nologin" -&gt; { "Human Resources" }
        create =&gt; "true",
        comment =&gt; "Disallow non-root logins on the weekend.
                    We believe in work-life balance, and
                    encourage it.";

    linux.!(Sunday|Saturday)::
      "/etc/nologin" -&gt; { "Business Operations" }
        delete =&gt; tidy,
        comment =&gt; "People need to be able to log in for them
                  to do their work during the week";
}
</code></pre>
</div>

<aside class="notes">
<p>
Here we use class expressions to make sure that unprivileged users are not
allowed to log in on the weekend, and also that they are allowed to log in
during the week.
</p>

</aside>

</section>
<section id="slide-org877b64a">
<h3 id="org877b64a">Class types</h3>
<ul>
<li>Hard Classes</li>
<li>Soft Classes</li>

</ul>

</section>
<section id="slide-org4a53696">
<h3 id="org4a53696">Hard classes</h3>
<ul>
<li>Defined by agent</li>
<li>Not configurable</li>
<li>Always available</li>
<li>Discovered each run</li>
<li>Cannot be undefined</li>

</ul>

<p>
<code>redhat</code>, <code>Thursday</code>, <code>linux</code>
</p>

</section>
<section id="slide-org79c224b">
<h3 id="org79c224b">Soft classes</h3>
<ul>
<li>Defined by policy</li>
<li>Based on anything</li>
<li>Available after definition</li>
<li>Can persist for period of time</li>
<li>Can be namespace or bundle scoped</li>
<li>Can be undefined only as the result of a promise</li>

</ul>

</section>
<section id="slide-org9908b33">
<h3 id="org9908b33">Valid Class names</h3>
<ul>
<li>Allowed characters include <code>[a-zA-Z0-9_]</code></li>
<li><b>Canonify</b> a string to produce a valid class name
<ul>
<li>Converts invalid characters to <code>_</code>.</li>

</ul></li>
<li>Automatically canonified <b>when defined</b></li>

</ul>

<p>
<b>Note:</b> Classes are <b>NOT</b> automatically canonified when <b>checked</b>.
</p>

</section>
<section id="slide-org7e47aa6">
<h4 id="org7e47aa6">Example of automatic canonification</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-01-classes_canonification.cf</code></label>
<pre id="examples/00-01-classes_canonification.cf"><code class="cfengine3" >bundle agent main
{
  vars:
    "my_class_name" string =&gt; "Invalid-Class/Name!";
    "c_my_class_name" string =&gt; canonify( "$(my_class_name)" );

  classes:
    "$(my_class_name)" expression =&gt; "any";

  reports:

    "'$(my_class_name)' is **NOT** a class that is defined"
      unless =&gt; "$(my_class_name)";

    "'$(c_my_class_name)' **IS** a defined class"
      if =&gt; canonify( $(my_class_name) );
}
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: 'Invalid-Class/Name!' is **NOT** a class that is defined
R: 'Invalid_Class_Name_' **IS** a defined class
</pre>

</section>
<section id="slide-orgb77589e">
<h3 id="orgb77589e">Class scope</h3>
<p>
Classes have one of two scopes:
</p>

<dl>
<dt>Namespace</dt><dd>The class is visible from other bundles</dd>
<dt>Bundle</dt><dd>The class is only visible from within the bundle it was defined</dd>

</dl>

<p>
Caveat methods promises that use <code>inherit =&gt; "true"</code>
</p>

<aside class="notes">
<ul>
<li>Bundles actuated by methods promises that use <code>inherit =&gt; "true"</code> have access to their parents bundle scoped classes.</li>

</ul>

</aside>

</section>
<section id="slide-orga1b280a">
<h4 id="orga1b280a">Namespace scoped classes</h4>
<ul>
<li>Aka <i>globally scoped</i></li>
<li>Accessible from any bundle</li>
<li>Persist until end of agent run or explicitly undefined.</li>
<li>Must be used if want reported to CFEngine Enterprise Hub</li>
<li>All hard classes are namespace scoped</li>

</ul>

<aside class="notes">
<ul>
<li>Namespace scoped classes are also referred to as "global" classes.</li>
<li>Inventoried classes <b>must be <code>namespace</code> scoped</b>.</li>

</ul>

</aside>

</section>
<section id="slide-orgcda4eab">
<h4 id="orgcda4eab">Non default namespace</h4>
<ul>
<li>Beware confusing namespace <i>scope</i> with specific namespace</li>
<li>Referencing non-default namespace scoped classes
<code>class_in_current_NS|anotherNS:another_class::</code></li>

</ul>

<aside class="notes">
<p>
Don't worry too much about non-default namespaces yet. It's an advanced topic
and mostly relates to very large policy sets or environments with many
different groups of policy writers.
</p>

</aside>

</section>
<section id="slide-org2e58cfc">
<h4 id="org2e58cfc">Bundle scoped classes</h4>
<ul>
<li>Accessible from within the bundle where they were defined</li>

</ul>

<aside class="notes">
<ul>
<li>Bundles actuated by methods promises that use <code>inherit =&gt; "true"</code> have access to their parents bundle scoped classes.</li>

</ul>

</aside>

</section>
<section id="slide-org15da899">
<h3 id="org15da899">Class scope rules</h3>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 2:</span> Default scope for <b>classes</b> type promises</caption>

<colgroup>
<col  class="org-left" />

<col  class="org-left" />
</colgroup>
<tbody>
<tr>
<td class="org-left">Bundle Type</td>
<td class="org-left">Scope</td>
</tr>

<tr>
<td class="org-left"><code>common</code></td>
<td class="org-left"><code>namespace</code></td>
</tr>

<tr>
<td class="org-left"><code>agent</code></td>
<td class="org-left"><code>bundle</code></td>
</tr>
</tbody>
</table>

<ul>
<li><code>classes</code> bodies (define classes based on promise results default to <b>namespace scope</b>)</li>

</ul>

</section>
<section id="slide-org85b1082">
<h4 id="org85b1082">Example class scopes for classes type promises</h4>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent bundle0
{
  classes:
      "I_will_be_bundle_scoped"
        expression =&gt; "any";
}
bundle common bundle1
{
  classes:
      "I_will_be_namespace_scoped"
        expression =&gt; "any";
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>By default classes defined by classes type promises in <b>common bundles</b> are <b>namespace scoped</b></li>

<li>By default classes defined by classes type promises in <b>agent bundles</b> are <b>bundle scoped</b></li>

<li>By default classes defined as the <b>result of promise outcomes</b> (<code>classes bodies</code>) are <b>namespace scoped</b></li>

</ul>

<p>
Namespace scope classes if not maintained well can cause other conditions to be met unexpectedly. For example, consider if you defined the class  <code>config_repaired</code> or <code>restart_service</code>. Which config, which service?
</p>

<ul>
<li>I like to use classes like <code>sshd_confg_repaired</code>, <code>proposed_sshd_config_validated</code></li>

<li>So that you</li>

</ul>

</aside>

</section>
<section id="slide-org968a647">
<h4 id="org968a647">Pro tips</h4>
<ul>
<li>Use <b><code>bundle</code></b> scoped classes whenever possible.</li>
<li>Define classes that describe the current state, not desired action.</li>

</ul>

</section>
<section id="slide-org930f5a4">
<h4 id="org930f5a4">Example class names</h4>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent sshd_config
{
  services:
      "sshd"
        service_policy =&gt; "start";

    sshd_config_repaired.proposed_sshd_config_validated::
      "sshd"
        service_policy =&gt; "restart";
}
</code></pre>
</div>
</section>
<section id="slide-orgb90e6b9">
<h3 id="orgb90e6b9">Define custom classes by expression</h3>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-10-classes_by_expression.cf</code></label>
<pre id="examples/00-10-classes_by_expression.cf"><code class="cfengine3" >bundle agent main
{
  classes:
    "weekend" or =&gt; { "Saturday", "Sunday" };
    "weekday" not =&gt; "weekend";

    "business_hours"
      expression =&gt; "weekday.(Hr9|Hr10|Hr11|Hr13|Hr14|Hr15|Hr16|Hr17)",
      comment =&gt; "Weekdays from 9-5 excluding the lunch hour.";

    "webserver"
      expression =&gt; regcmp( "www.*", $(sys.fqhost) ),
      comment =&gt; "Identify webservers based on their name";

    "north_america"
      expression =&gt; iprange( "10.1.0.0/16" );
}
</code></pre>
</div>

</section>
<section id="slide-orga49c8f5">
<h3 id="orga49c8f5">Define custom classes by promise outcome</h3>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-10-classes_define_based_on_promise_outcome.cf</code></label>
<pre id="examples/00-10-classes_define_based_on_promise_outcome.cf"><code class="cfengine3" >bundle agent main
{
  vars:
    "config[PermitRootLogin]" string =&gt; "no";

  files:
    "/etc/ssh/sshd_config"
      edit_line =&gt; set_line_based("$(this.bundle).config", # Config MAP
                                  " ",        # Separator
                                  "\s+",      # Separator regex
                                  ".*",       # Keys to consider
                                  "\s*#\s*"), # Lines to ignore
      classes =&gt; scoped_classes_generic("bundle", "sshd_config");

  services:
    sshd_config_repaired::
      "sshd"
        service_policy =&gt; "restart",
        comment =&gt; "For sshd to pick up changed config it must be restarted."
}
</code></pre>
</div>

</section>
<section id="slide-orgad71aca">
<h3 id="orgad71aca">Example - traditional class expressions</h3>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-10-classes_traditional_expression.cf</code></label>
<pre id="=examples/00-10-classes_traditional_expression.cf="><code class="cfengine3" >bundle agent main
{
  reports:
      "Hello World!";
    linux.!(Saturday|Sunday)::
      "This is a linux host.";
      "Today is not Saturday or Sunday.";
}
</code></pre>
</div>

<pre class="example">
R: Hello World!
R: This is a linux host.
R: Today is not Saturday or Sunday.
</pre>


<aside class="notes">
<ul>
<li>Apply until the next class expression, promise type, or end of bundle</li>
<li>If unspecified promises are in the <code>any</code> context.</li>
<li>Variables are not allowed in traditional class expressions.</li>

</ul>

</aside>

</section>
<section id="slide-org63e0397">
<h3 id="org63e0397">Example - restrict individual promises with if and unless</h3>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-10-classes_example_if_and_unless.cf</code></label>
<pre id="=examples/00-10-classes_example_if_and_unless.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "platforms" slist =&gt; { "linux", "windows" };

  reports:
    "I am a $(platforms) host"
      if =&gt; "$(platforms)";
      # ifvarclass =&gt; "$(platforms)";

    "I was made by Microsoft"
      unless =&gt; "!windows";
}
</code></pre>
</div>

<pre class="example">
R: I am a linux host
</pre>


<aside class="notes">
<ul>
<li>You may see the use of ifvarclass, it's the original syntax</li>
<li><b><b>AND</b></b> with a traditional class expression.</li>

</ul>

</aside>

</section>
<section id="slide-org1caf79e">
<h3 id="org1caf79e">Example - variable class expressions</h3>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-10-classes_example_variable_class_expressions.cf</code></label>
<pre id="examples/00-10-classes_example_variable_class_expressions.cf"><code class="cfengine3" >bundle agent main
{
  vars:
    "platforms" slist =&gt; { "linux", "windows" };

  reports:
    !(Saturday|Sunday)::
      "It's a weekday and I am a $(platforms) host!"
        if =&gt; "$(platforms)";

    "$(platforms)"::
      "I am a $(platforms) host and it's a weekday!"
        if =&gt; "!(Saturday|Sunday)";
}
</code></pre>
</div>

<pre class="example">
R: It's a weekday and I am a linux host!
R: I am a linux host and it's a weekday!
</pre>


<aside class="notes">
<ul>
<li><b>More flexibility with variable class expressions</b></li>
<li><p>
Like traditional class expressions variable class expressions apply until the next class expression, promise type, or end of bundle.
</p>

<p>
In 3.7 traditional class expressions gained the ability to de-reference
variables when quoted.
</p></li>

</ul>

</aside>

</section>
<section id="slide-org7bef44c">
<h3 id="org7bef44c">Functions that return "context"</h3>
<div class="org-src-container">

<pre><code class="sh" >cf-promises --syntax-description json | jq '.functions | \
   with_entries( select(.value.returnType == "context") ) | \
   keys | join( ", ")'
</code></pre>
</div>

<p>
accessedbefore, changedbefore, classify, classmatch, every, fileexists, filesexist, groupexists, hashmatch, hostinnetgroup, hostrange, iprange, isdir, isexecutable, isgreaterthan, isipinsubnet, islessthan, islink, isnewerthan, isplain, isvariable, laterthan, ldaparray, none, processexists, read_module_protocol, regarray, regcmp, regextract, regldap, regline, reglist, remoteclassesmatching, returnszero, some, splayclass, strcmp, usemodule, userexists
</p>

</section>
<section id="slide-org2873ea8">
<h3 id="org2873ea8">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>What types of classes are there?</li>

</ul>

<ul class="fragment roll-in">
<li>What is the difference?</li>

</ul>

<ul class="fragment roll-in">
<li>What are valid class characters?</li>

</ul>

<ul class="fragment roll-in">
<li>What is the default scope for classes defined as the result of a promise outcome using a classes body?</li>

</ul>

<ul class="fragment roll-in">
<li>What component serves policy files, which hosts can be a policy server?</li>

</ul>

<ul class="fragment roll-in">
<li>What special character can be used in class expressions that is not a logical operator?</li>

</ul>

<ul class="fragment roll-in">
<li>Where is that special character used?</li>

</ul>

<aside class="notes">
<dl>
<dt>What types of classes are there?</dt><dd>Hard, Soft</dd>
<dt>What is the difference?</dt><dd>Hard, defined by core agent, Soft defined by users/policy</dd>
<dt>What are valid class characters?</dt><dd><code>[A-Za-z0-9_]</code></dd>
<dt>What is the default scope for classes defined as the result of a promise outcome using a classes body?</dt><dd><b>namespace</b> (globally accessible)</dd>
<dt>What component serves policy files, which hosts can be a policy server?</dt><dd>Files are served by <code>cf-serverd</code>; any system <i>can</i> be a policy server.</dd>
<dt>What special character can be used in class expressions that is not a logical operator?</dt><dd><code>:</code></dd>
<dt>Where is that special character used?</dt><dd>Between a class and it's namespace and at the end of the class expression.</dd>

</dl>

</aside>
</section>
</section>
<section>
<section id="slide-orgaf76c49">
<h2 id="orgaf76c49">Variables &amp; Data Types</h2>

</section>
<section id="slide-orgd6367d3">
<h3 id="orgd6367d3">Variable Scoping</h3>
<ul>
<li>All variables are globally accessible</li>
<li><code>$(variable)</code>, <code>@(list or data container)</code></li>
<li>Use fully qualified variable names when accessing variables in other bundles.
<ul>
<li><code>$(bundle.variable)</code>, <code>@(bundle.list)</code></li>
<li><code>$(namespace:bundle.variable)</code>, <code>@(namespace:bundle.list)</code></li>

</ul></li>

</ul>

</section>
<section id="slide-org8256eb6">
<h3 id="org8256eb6">Datatypes</h3>
<ul>
<li>string, int, real</li>
<li>slist, ilist, rlist</li>
<li>classic "array"</li>
<li>data</li>

</ul>
</section>
<section id="slide-orgb0a0146">
<h4 id="orgb0a0146">Example - strings</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-01-strings.cf</code></label>
<pre id="=examples/00-01-strings.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "string1" string =&gt; "one";
    "string2" string =&gt; "strings
can be multi-line";
    "string3" string =&gt; "with \"quotes\"";
    "string4" string =&gt; 'or "quotes"';
    "string5" string =&gt; `with 'single' and "double" quotes`;

  reports:
    "string1 = '$(string1)'";
    "string2 = '$(string2)'";
    "string3 = '$(string3)'";
    "string4 = '$(string4)'";
    "string5 = '$(string5)'";
}
</code></pre>
</div>

<aside class="notes">
<p>
Notice: single quotes (<code>'</code>), doublequotes (<code>"</code>), and backticks (<code>`</code>) can be interpolated when you want to include them within a string.
</p>

</aside>

</section>
<section>

<pre class="example">
R: string1 = 'one'
R: string2 = 'strings
can be multi-line'
R: string3 = 'with "quotes"'
R: string4 = 'or "quotes"'
R: string5 = 'with 'single' and "double" quotes'
</pre>

</section>
<section id="slide-org9a08080">
<h4 id="org9a08080">Example - numbers</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-02-numbers.cf</code></label>
<pre id="=examples/00-02-numbers.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "var1" int =&gt; "1";
    "var2" int =&gt; "10K";
    "var3" real =&gt; "1.2";
    "var4" real =&gt; "10e-5";
    "var5" int =&gt; "inf";

  reports:
    "var1 = '$(var1)'";
    "var2 = '$(var2)'";
    "var3 = '$(var3)'";
    "var4 = '$(var4)'";
    "inf = '$(var5)'";
}
</code></pre>
</div>

<aside class="notes">
<p>
Integers may use suffixes to represent large numbers. The following suffixes can
be used to create integer values for common powers of 1000.
</p>

<dl>
<dt><code>k</code></dt><dd>value times 1000</dd>
<dt><code>m</code></dt><dd>value times 1000^2</dd>
<dt><code>g</code></dt><dd>value times 1000^3</dd>

</dl>

<p>
Since computing systems such as storage and memory are based on binary values,
CFEngine also provide the following uppercase suffixes to create integer
values for common powers of 1024.
</p>

<dl>
<dt><code>K</code></dt><dd>value times 1024</dd>
<dt><code>M</code></dt><dd>value times 1024^2</dd>
<dt><code>G</code></dt><dd>value times 1024^3</dd>

</dl>

<p>
However, the values must have an integer numeric part (e.g. 1.5M is not
allowed).
</p>

<p>
In some contexts, <code>%</code> can be used a special suffix to denote percentages.
</p>

<p>
Lastly, there is a reserved value which can be used to specific a parameter as
having no limit at all.
</p>

<dl>
<dt><code>inf</code></dt><dd>a constant representing an "unlimited", value. <b>But, not in <i>all</i> cases</b>.</dd>

</dl>
<p>
<a href="https://docs.cfengine.com/docs/master/reference-language-concepts-variables.html#scalar-variables">https://docs.cfengine.com/docs/master/reference-language-concepts-variables.html#scalar-variables</a>
</p>

<p>
inf is a special value that in the code corresponds to the magic number of 999999999 (nine nines). Thus any function that accepts a number, can accept inf without a problem. Keep in mind though that you can get a higher number if you set the upper limit manually, but that's almost never a problem.
</p>

<p>
For a few functions inf is being treated specially and truly means "there is no limit" instead of "nine nines limit". This is the case for the maxbytes parameter and applies to most read* functions.
</p>

</aside>

</section>
<section>

<pre class="example">
R: var1 = '1'
R: var2 = '10240'
R: var3 = '1.200000'
R: var4 = '0.000100'
R: inf = '999999999'
</pre>


</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent lets_talk_about_inf_baby
{
    vars:
      "inf_is" int =&gt; "inf";
      "biggest_int" int =&gt; "99999999999";
      #"biggest_int" int =&gt; "100000000000"; # error: Integer is out of range

    reports:
     "inf ($(inf_is)) &lt; biggest_int ($(biggest_int))"
      if =&gt; isgreaterthan( $(biggest_int), $(inf_is) );

     "biggest_int ($(biggest_int)) is $(with) greater than inf ($(inf_is))"
       with =&gt; format( "%0.0f", eval( "$(biggest_int)-$(inf_is)", math, infix));
}
bundle agent __main__
{
   methods: "lets_talk_about_inf_baby";
}
</code></pre>
</div>

<pre class="example">
R: inf (999999999) &lt; biggest_int (99999999999)
R: biggest_int (99999999999) is 99000000000 greater than inf (999999999)
</pre>


<aside class="notes">
<dl>
<dt><code>inf</code></dt><dd>a constant representing an "unlimited", value. <b>But, not in <i>all</i> cases</b>.</dd>

</dl>
<p>
<a href="https://docs.cfengine.com/docs/master/reference-language-concepts-variables.html#scalar-variables">https://docs.cfengine.com/docs/master/reference-language-concepts-variables.html#scalar-variables</a>
</p>

<p>
inf is a special value that in the code corresponds to the magic number of 999999999 (nine nines). Thus any function that accepts a number, can accept inf without a problem. Keep in mind though that you can get a higher number if you set the upper limit manually, but that's almost never a problem.
</p>

<p>
For a few functions inf is being treated specially and truly means "there is no limit" instead of "nine nines limit". This is the case for the maxbytes parameter and applies to most read* functions.
</p>

</aside>

</section>
<section id="slide-org3345c9f">
<h4 id="org3345c9f">Example - lists</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-04-lists.cf</code></label>
<pre id="=examples/00-04-lists.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "var1" ilist =&gt; { 1, 2, "3", "4" };
    "var2" rlist =&gt; { "1.2", "2.0", "3.3" };
    "var3" slist =&gt; { "one", "two", three,
                      @(var1), @(var2),
                    };
    "var4" real =&gt; sum( var2 );

  reports:
    "var1 = '$(var1)'";
    "var2 = '$(var2)'";
    "var3 = '$(var3)'";
    "var4 = '$(var4)'";
}
</code></pre>
</div>

<aside class="notes">
<p>
If you refer to a list variable as a scalar (<code>$(var)</code>), CFEngine interprets it to mean <i>iterate over all the values in the list</i>.
</p>

</aside>

</section>
<section>

<pre class="example" id="org083999c">
R: var1 = '1'
R: var1 = '2'
R: var1 = '3'
R: var1 = '4'
R: var2 = '1.2'
R: var2 = '2.0'
R: var2 = '3.3'
R: var3 = 'one'
R: var3 = 'two'
R: var3 = 'three'
R: var3 = '1'
R: var3 = '2'
R: var3 = '3'
R: var3 = '4'
R: var3 = '1.2'
R: var3 = '2.0'
R: var3 = '3.3'
R: var4 = '6.500000'
</pre>

</section>
<section id="slide-orgca2f845">
<h4 id="orgca2f845">Example - list iteration (loops)</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-03-list_iteration.cf</code></label>
<pre id="=examples/00-03-list_iteration.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "numbers" slist =&gt; { "1", "2", "3" };
    "colors" slist =&gt; { "red", "green", "blue" };

  reports:
    "$(numbers)";
    "$(colors)";
    "$(numbers) with $(colors)";
    "$(colors) with $(numbers)";
}
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org6fa9ae8">
R: 1
R: 2
R: 3
R: red
R: green
R: blue
R: 1 with red
R: 1 with green
R: 1 with blue
R: 2 with red
R: 2 with green
R: 2 with blue
R: 3 with red
R: 3 with green
R: 3 with blue
R: red with 1
R: red with 2
R: red with 3
R: green with 1
R: green with 2
R: green with 3
R: blue with 1
R: blue with 2
R: blue with 3
</pre>

</section>
<section id="slide-orgf59cc58">
<h4 id="orgf59cc58">Example - "Classic" Arrays</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-05-classic_arrays.cf</code></label>
<pre id="=examples/00-05-classic_arrays.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "file[motd]"  string =&gt; "/etc/motd";
    "file[fstab]" string =&gt; "/etc/fstab";

    "file_idx" slist =&gt; getindices( file );
    "files" slist =&gt; getvalues( file );

  reports:
   "The key '$(file_idx)' has the value '$(file[$(file_idx)])'";
   "file: '$(files)'";
}
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: The key 'motd' has the value '/etc/motd'
R: The key 'fstab' has the value '/etc/fstab'
R: file: '/etc/motd'
R: file: '/etc/fstab'
</pre>

</section>
<section id="slide-orga07b9ec">
<h4 id="orga07b9ec">Example - data containers</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-06-data_containers.cf</code></label>
<pre id="=examples/00-06-data_containers.cf="><code class="cfengine3" >bundle agent main
{
  vars:
    "server" string =&gt; "mirror.int.cfengine.com";
    "repos"
      data =&gt; '{
                "rhel6_updates": {
                  "id": { "value":"RHEL6_UPDATES" },
                  "name": { "value": "RHEL 6.x Updates" },
                  "baseurl": { "value": "https://$(server)/RHEL6/updates" }
                }
              }';

    "idx" slist =&gt; getindices( repos );

  reports:
    "URL = '$(repos[$(idx)][baseurl][value])'";
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>Note: reading data from files will NOT expand cfengine variables by default
<ul>
<li>Not necessarily recommended to mix cfengine variables in external data
<ul>
<li>Now data must know something about CFEngine, ideally it's independent data</li>
<li>But, if you really want &#x2026; the <code>dataexpand()</code> function can help</li>

</ul></li>

</ul></li>

</ul>

</aside>

</section>
<section>

<pre class="example" id="orgd61d437">
R: URL = 'https://mirror.int.cfengine.com/RHEL6/updates'
</pre>

</section>
<section id="slide-org5bd5ba7">
<h4 id="org5bd5ba7">Associative Arrays vs Data containers</h4>
<ul>
<li>Data containers defined as a single variable</li>
<li>Associative Arrays aka Classic arrays
<ul>
<li>collection of individual variables</li>
<li>cleared at the start of each bundle evaluation</li>

</ul></li>

</ul>

<aside class="notes">
<ul>
<li>Data containers are defined as a single entity</li>
<li>Associative Arrays are defined by each index</li>
<li>"Classic arrays" are cleared at the start of each bundle evaluation</li>

<li>Arrays are a collection of related variables</li>
<li>Data containers are a single variable</li>

</ul>

</aside>

</section>
<section id="slide-org52e8e00">
<h4 id="org52e8e00">Example Associative Arrays vs Data containers</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/00-04-classicarray-vs-datacontainer.cf</code></label>
<pre id="=examples/00-04-classicarray-vs-datacontainer.cf="><code class="cfengine3" >bundle agent main
{
  vars:
      "ClassicArray[key]" string =&gt; "value";
      "ClassicArray[deep]" slist =&gt; { "list" };
      "ClassicArray[nevermind]"
        string =&gt; "value",
        if =&gt; "notdefined";
      "DataContainer"
        data =&gt; '{ "key": "value", "deep": [ "list" ] }';

  reports:
      "ClassicArray:$(with)"
        with =&gt; storejson( ClassicArray);
      "DataContainer:$(with)"
        with =&gt; storejson( DataContainer);
}
</code></pre>
</div>

</section>
<section id="slide-orgad26b8a">
<h4 id="orgad26b8a">Example Associative Arrays vs Data containers output</h4>
<pre class="example" id="orgb75a7bc">
R: ClassicArray:{
  "deep": [
    "list"
  ],
  "key": "value"
}
R: DataContainer:{
  "deep": [
    "list"
  ],
  "key": "value"
}
</pre>

</section>
<section id="slide-orgdc05753">
<h3 id="orgdc05753">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>Which component makes changes to your system?</li>

</ul>

<ul class="fragment roll-in">
<li>Which component schedules agent runs?</li>

</ul>

<ul class="fragment roll-in">
<li>What symbol terminates a promise?</li>

</ul>

<ul class="fragment roll-in">
<li><a href="images/What is your quest - To seek the Holy Grail.mp4">What is your quest?</a></li>

</ul>

<ul class="fragment roll-in">
<li>What are promise comments used for?</li>

</ul>

<ul class="fragment roll-in">
<li>What types of variables are available?</li>

</ul>

<ul class="fragment roll-in">
<li>How are decisions made?</li>

</ul>

<aside class="notes">
<dl>
<dt>Which component makes changes to your system?</dt><dd><code>cf-agent</code></dd>
<dt>Which component schedules agent runs?</dt><dd><code>cf-execd</code></dd>
<dt>What symbol terminates a promise?</dt><dd>semicolon (<code>;</code>)</dd>
<dt>What is your quest?</dt><dd><b>To seek the Holy Grail!</b></dd>
<dt>What are promise comments used for?</dt><dd>To document <b>why</b> a promise is important.</dd>
<dt>What types of variables are available?</dt><dd>list, string, int, real, data</dd>
<dt>How are decisions made?</dt><dd>Using classes and class expressions</dd>

</dl>

</aside>

</section>
</section>
<section>
<section id="slide-orgc2d8874">
<h2 id="orgc2d8874">Policy Examples</h2>
<aside class="notes">
<p>
For convenience in working with examples we will use the [autorun]() feature
from the masterfiles policy framework.
</p>

<ul>
<li>Autorun bundles are executed in lexical order. Use digit prefixes to get
specific ordering.</li>

</ul>

</aside>

</section>
<section id="slide-org2e53786">
<h3 id="org2e53786">Create a file</h3>
<p>
<a href="examples/00-20-example-create_file.cf">examples/00-20-example-create_file.cf</a>
</p>
<div class="org-src-container">

<pre id="=examples/00-20-example-create_file.cf="><code class="cfengine3" >bundle agent nologin
{

  meta:
      "tags" slist =&gt; { "autorun" };
  files:
      "/tmp/nologin"
        create =&gt; "true",
        classes =&gt; results("bundle", "my_file");

  reports:
    my_file_repaired::
      "File repaired";

    any::
      "File Exists"
        if =&gt; fileexists("/tmp/nologin");
}
bundle agent __main__
{
      methods:"nologin";
}
</code></pre>
</div>

<pre class="example">
R: File repaired
R: File Exists
</pre>


<aside class="notes">
<p>
Copy this example to <code>services/autorun/nologin.cf</code> and run the policy.
What happens when you restrict the context of the <code>tags</code> meta variable?
</p>

</aside>

</section>
<section id="slide-orgaf8a785">
<h3 id="orgaf8a785">Update file</h3>
<p>
<a href="examples/00-20-example-update_file.cf">examples/00-20-example-update_file.cf</a>
</p>
<div class="org-src-container">

<pre id="=examples/00-20-example-update_file.cf="><code class="cfengine3" >bundle agent heartbeat
{
  files:
    "$(sys.statedir)/$(this.bundle)" -&gt; { "Monitoring" }
      create  =&gt; "true",
      touch   =&gt; "true",
      classes =&gt; results("bundle", "heartbeat"),
      handle  =&gt; "cf_agent_heartbeat_thump",
      comment =&gt; "This policy simply updates the timestamp
                  of the file so an external monitoring
                  system can validate the system is working.";

  reports:
    DEBUG|DEBUG_cf_agent_heartbeat::

      "DEBUG $(this.bundle): Heartbeat"
        if =&gt; "heartbeat_repaired";

      "DEBUG $(this.bundle): Flatline"
        unless =&gt; "heartbeat_repaired";
}
  bundle agent __main__{methods:"heartbeat";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What happens when you run the policy?
<ul>
<li>Nothing</li>

</ul></li>
<li>Why?
<ul>
<li>Because the bundle is not <i>tagged</i> with <code>autorun</code></li>

</ul></li>
<li>Adjust the policy so that it gets run automatically</li>

</ul>

</aside>

<pre class="example">
R: DEBUG main: Heartbeat
</pre>

</section>
<section id="slide-org9a87cbc">
<h3 id="org9a87cbc">Make sure a package is installed and service running</h3>
<p>
<a href="examples/00-20-example-package_and_service.cf">examples/00-20-example-package_and_service.cf</a>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent example_package_and_service
{
  meta:
    !policy_server::
      "tags" slist =&gt; { "autorun" };

  vars:
    centos|redhat::
      "_package" string =&gt; "httpd";
      "_service" string =&gt; "httpd";

    ubuntu|debian::
      "_package" string =&gt; "apache2";
      "_service" string =&gt; "apache2";

    any::
      "_default_page"
        string =&gt; ifelse( "debian|ubuntu", "/var/www/html/index.html",
                          "centos|redhat", "/var/www/error/noindex.html",
                          "UNKNOWN" ),
        meta =&gt; { "inventory", "attribute_name=Apache Default Page"};

  packages:
      "$(_package)"
        policy =&gt; "present";

  services:
      "$(_service)"
        service_policy =&gt; "start";

  reports:
    inform_mode|verbose_mode::
      "My default page is from $(_default_page)";
}
bundle agent __main__{methods:"example_package_and_service";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What is this policy doing?
<ul>
<li>Defining variables for different platforms</li>
<li>Defining and inventorying the default page based on platform</li>
<li>Ensuring the package (name based on variable which differs by platform) is present</li>
<li>Ensure the service is running</li>

</ul></li>
<li>Note, there are two implementations of <i>packages</i> promises.</li>

</ul>

</aside>

</section>
<section id="slide-org27169c3">
<h4 id="org27169c3">Competing implementations of packages promises</h4>
<ul>
<li><i>methods</i> (legacy) vs <i>modules</i> (modern)</li>

</ul>

<div class="org-src-container">

<pre><code class="cfengine3" >packages:
  "apache2"
    package_policy =&gt; "add",
    comment =&gt; "I use the method based implementation";

  "apache2"
    policy =&gt; "present",
    comment =&gt; "I use the module based implementation";
</code></pre>
</div>

<aside class="notes">
<ul>
<li>package methods allow for more flexible version specification</li>
<li>package modules allow for more simple expression of state</li>
<li>Developing package methods only allow specification of regex and commands</li>
<li>Developing package modules allows much freedom and they interface with cf-agent via the module protocol</li>
<li>More package methods available than package modules</li>
<li>Recommend using package modules</li>

</ul>

</aside>

</section>
<section id="slide-org5551bf9">
<h3 id="org5551bf9">Classify role based on hostname</h3>
<p>
<a href="examples/00-20-example-classes-role_by_hostname.cf">examples/00-20-example-classes-role_by_hostname.cf</a>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle common classes_role_by_hostname
{
  classes:
    "env_prod"
      meta =&gt; { "inventory", "attribute_name=Role Classes" },
      or =&gt; {
              regcmp( "hub", $(sys.uqhost) ),
              regcmp( "^prd.*", $(sys.uqhost) ),
            };

    "webserver"
      expression =&gt; "host001",
      meta =&gt; { "inventory", "attribute_name=Role Classes" };

    "webserver"
      expression =&gt; regcmp( "^www.*", $(sys.fqhost) ),
      meta =&gt; { "inventory", "attribute_name=Role Classes" };
}
bundle agent __main__{methods:"classes_role_by_hostname";}
</code></pre>
</div>

</section>
<section id="slide-org09f8978">
<h3 id="org09f8978">Classify geographic location by network</h3>
<p>
<a href="examples/00-20-example-classes-geographic_location_by_network.cf">examples/00-20-example-classes-geographic_location_by_network</a>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle common classify_geo_location_by_network
{
  meta:
    "tags" slist =&gt; { "autorun" };

  vars:
    "nadc01_subnets"
      slist =&gt; { "172.16.25.0/25", "172.17.0.0/16",
                 "192.168.33.2/32",
               };

    "nadc02_subnets"
      slist =&gt; { "172.17.5.0/25", "172.42.0.0/16",
                 "192.168.33.3/32",
               };

    "sadc01_subnets"
      slist =&gt; { "172.19.4.0/23", "192.168.33.4-5" };

    "continent"
      string =&gt; ifelse("north_america", "North America",
                       "south_america", "South America",
                       "Unknown"),
      meta =&gt; { "inventory", "attribute_name=Continent" };
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What does this policy do?
<ul>
<li>Defines some variables containing subnet specifications</li>
<li>Defines and inventories variable for continent based on presence of other classes
<ul>
<li>Where are those other classes defined?
<ul>
<li>Further down in the policy</li>

</ul></li>
<li>How does something written further down in the policy affect something at the top?
<ul>
<li>Normal Order, 3 passes</li>

</ul></li>

</ul></li>

</ul></li>

</ul>

</aside>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Continued <code>examples/00-20-example-classes-geographic_location_by_network.cf</code></label>
<pre><code class="cfengine3" >
  classes:
    "north_america"
      or =&gt; { "nadc01", "nadc02" };

    "south_america"
      expression =&gt; classmatch("^sadc\d+");

    "nadc01"
      expression =&gt; iprange( $(nadc01_subnets) );

    "nadc02"
      expression =&gt; iprange( $(nadc02_subnets) );

    "sadc01"
      expression =&gt; iprange( $(sadc01_subnets) );

  reports:
    "DEBUG|DEBUG_$(this.bundle)"::
      "DEBUG $(this.bundle): Continent = '$(continent)'";
}
bundle agent __main__{methods:"classify_geo_location_by_network";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What does this policy do?
<ul>
<li>Defines some classes based on the host having an ip within known subnet ranges</li>
<li>Emits debug reports if DEBUG class is defined</li>

</ul></li>

</ul>

</aside>

</section>
<section id="slide-orge613492">
<h3 id="orge613492">Manage key value entries in a config file</h3>
<p>
<a href="examples/00-20-example-key_value_config.cf">examples/00-20-example-key_value_config.cf</a>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent manage_ssh
{
  meta:
    "tags" slist =&gt; { "autorun" };

  methods:
    "SSH Config Data"
      usebundle =&gt; ssh_config;

    "Manage SSH Config"
      usebundle =&gt; ssh_config_manage_kv("ssh_config.data");
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent ssh_config
{
  vars:
      "data[PermitRootLogin]" string =&gt; "no";
      "data[Protocol]" string =&gt; "2";
      "data[Port]" string =&gt; "22";

    DEBUG|DEBUG_ssh_config::
      "keys" slist =&gt; getindices(data);

  reports:
    DEBUG|DEBUG_ssh_config::
      "DEBUG $(this.bundle): $(keys) = '$(data[$(keys)])'";
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent ssh_config_manage_kv(data)
{
  vars:
    "config" string =&gt; "/etc/ssh/sshd_config";

  files:
    "$(config)"
      handle =&gt; "ssh_config_manage_kv_entries",
      edit_line =&gt; set_line_based("$(data)", " ", "\s+", ".*", "\s*#\s*"),
      classes =&gt; scoped_classes_generic("bundle", "sshd_config");

  classes:
    sshd_config_repaired::
      "config_valid"
        expression =&gt; returnszero("/usr/sbin/sshd -t -f $(config)", noshell),
        comment =&gt; "It's important that we don't restart the service with a
                    broken config, or the service will be down.";

  commands:
    sshd_config_repaired.config_valid::
      "$(paths.service)"
        handle =&gt; "ssh_config_manage_kv_restart_after_config_change",
        args =&gt; "sshd restart",
        comment =&gt; "The service must be restarted in order to pick up new
                    configuration settings.";

  reports:
      "DEBUG $(this.bundle): Reparied configuration"
        if =&gt; "sshd_config_repaired";

      "DEBUG $(this.bundle): Configuration Valid"
        if =&gt; "config_valid";

      "DEBUG $(this.bundle): Restarted sshd after config change"
        depends_on =&gt; { "ssh_config_manage_kv_restart_after_config_change" };
}
bundle agent __main__{methods:"manage_ssh";}
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org1cf155c">
[root@hub masterfiles]# cf-agent -KID DEBUG_ssh_config,DEBUG_ssh_config_manage_kv
    info: Installing cfe_internal_non_existing_package...
R: DEBUG ssh_config: PermitRootLogin = 'no'
R: DEBUG ssh_config: Protocol = '2'
R: DEBUG ssh_config: Port = '22'
    info: Edit file '/etc/ssh/sshd_config'
R: DEBUG ssh_config_manage_kv: Reparied configuration
    info: Executing 'no timeout' ... '/sbin/service sshd restart'
  notice: Q: "...in/service sshd": Stopping sshd:          [  OK  ]
Q: "...in/service sshd": Starting sshd:                    [  OK  ]
    info: Last 2 quoted lines were generated by promiser '/sbin/service sshd restart'
    info: Completed execution of '/sbin/service sshd restart'
R: DEBUG ssh_config_manage_kv: Configuration Valid
R: DEBUG ssh_config_manage_kv: Restarted sshd after config change
</pre>

</section>
<section id="slide-org6c88c51">
<h3 id="org6c88c51">Templating a file with mustache</h3>
<p>
<a href="examples/00-20-example-mustache_template_inline_using_datastate.cf">examples/00-20-example-mustache_template_inline_using_datastate.cf</a>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent motd
{
  meta:
    "tags" slist =&gt; { "autorun" };

  vars:
    "owner" string =&gt; "Bruce Wayne";

  files:
    "/etc/motd"
      template_method =&gt; "inline_mustache",
      edit_template_string =&gt; 'Welcome to {{{vars.sys.fqhost}}}!

For support issues please contact {{{vars.motd.owner}}}.';
}
bundle agent __main__{methods:"motd";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What does this policy do?
<ul>
<li>Renders <code>/etc/motd</code> using an inline mustache template, expanding variables from <code>datastate()</code></li>

</ul></li>
<li>How could you tweak this to set different owners for different hosts?</li>

</ul>

</aside>

</section>
<section id="slide-orgdce6aa9">
<h3 id="orgdce6aa9">Mustache extensions</h3>
<ul>
<li><code>-top-</code> data handed to the templating engine</li>
<li><code>@</code> Currently iterated <i>key</i></li>
<li><code>%</code> Multi-line JSON representation of data</li>
<li><code>$</code> Serialized JSON representation of data</li>

</ul>

<p>
<a href="examples/02-01-mustache-extensions.cf">examples/02-01-mustache-extensions.cf</a>
</p>
<div class="org-src-container">

<pre id="=examples/02-01-mustache-extensions.cf="><code class="cfengine3" >bundle agent example_mustache_extensions
{
  vars: "d" data =&gt; '{ "key": "value", "list": ["one", "two"]}';
  reports:
    "Multiline: $(with)" with =&gt; string_mustache( "{{%-top-}}", d);
    "Serial: $(with)" with =&gt; string_mustache( "{{$-top-}}", d);
    "Keys: $(with)" with =&gt; string_mustache( "{{#-top-}}{{{@}}}, {{/top}}", d);
}
bundle agent __main__{methods:"example_mustache_extensions";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What does this policy do?
<ul>
<li>Defines <code>d</code> as a data container</li>
<li>Emits multiline, serialized JSON representation of datacontainer</li>
<li>Emits keys of the data container</li>

</ul></li>

</ul>

</aside>

</section>
<section>

<pre class="example">
R: Multiline: {
  "key": "value",
  "list": [
    "one",
    "two"
  ]
}
R: Serial: {"key":"value","list":["one","two"]}
R: Keys: key, list,
</pre>


</section>
<section>
<p>
<a href="examples/02-01-mustache-extensions-yaml.cf">examples/02-01-mustache-extensions-yaml.cf</a>
</p>
<div class="org-src-container">

<pre id="=examples/02-01-mustache-extensions-yaml.cf="><code class="cfengine3" >bundle agent example_mustache_extensions_yaml
{
  vars: "d" data =&gt; '---
key: value
list:
  - one
  - two';
  reports:
    "Multiline: $(with)" with =&gt; string_mustache( "{{%-top-}}", d);
    "Serial: $(with)" with =&gt; string_mustache( "{{$-top-}}", d);
    "Keys: $(with)" with =&gt; string_mustache( "{{#-top-}}{{{@}}}, {{/top}}", d);
}
bundle agent __main__{methods:"example_mustache_extensions_yaml";}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>What does this policy do?
<ul>
<li>Defines <code>d</code> as a data container by specifying YAML inline</li>
<li>Emits multiline, serialized JSON representation of datacontainer</li>
<li>Emits keys of the data container</li>

</ul></li>
<li>Note: the output is identical to the version where <code>d</code> was defined with inline JSON</li>

</ul>

</aside>

</section>
<section>
<pre class="example">
R: Multiline: {
  "key": "value",
  "list": [
    "one",
    "two"
  ]
}
R: Serial: {"key":"value","list":["one","two"]}
R: Keys: key, list,
</pre>


<aside class="notes">
<ul>
<li>Note: the output is identical to the version where <code>d</code> was defined with inline JSON</li>

</ul>

</aside>

</section>
<section id="slide-org9e134f8">
<h3 id="org9e134f8">Inventory SSH Host Keys</h3>
<p class="forwardlink">
<a href="examples/inventory-ssh-host-keys.cf" class="forwardlink">examples/inventory-ssh-host-keys.cf</a>
</p>
<div class="org-src-container">

<pre id="examples/inventory-ssh-host-keys.cf"><code class="cfengine3" >bundle agent example_inventory_ssh_host_keys
{
  vars:
      "keys" slist =&gt; lsdir("/etc/ssh", "ssh_host_\w+_key", "false");
      "$(keys)"
        data =&gt; data_regextract("ssh_host_(?&lt;type&gt;\w+)_key", $(keys) );

      "type[$(keys)]"
        string =&gt; "$($(keys)[type])",
        meta =&gt; { "inventory", "attribute_name=SSH HostKey Type" };

      # Warning ssh-keygen output may vary across versions
      "fingerprint[$(keys)]"
        string =&gt; nth(
                       string_split(
                                     execresult("/usr/bin/ssh-keygen -l -f /etc/ssh/$(keys).pub",
                                                noshell),
                                     "\s+", 5), 1),
        meta =&gt; { "inventory", "attribute_name=SSH HostKey Fingerprint" };

  reports:
      "/etc/ssh/$(keys).pub
        type: $($(keys)[type])
        fingerprint: $(fingerprint[$(keys)])";
}
bundle agent __main__{methods:"example_inventory_ssh_host_keys";}
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org0839555">
R: /etc/ssh/ssh_host_ed25519_key.pub
        type: ed25519
        fingerprint: SHA256:NA04HcvSPZ/wAp/vJUIcOV799ImTWnbFEX0R9R2SXUI
R: /etc/ssh/ssh_host_ecdsa_key.pub
        type: ecdsa
        fingerprint: SHA256:gN37F6qt7vkYvVzxgOii5hNzu7EPJw/yTvEnRtr+rLk
R: /etc/ssh/ssh_host_dsa_key.pub
        type: dsa
        fingerprint: SHA256:/5b5NncWQL43gi9AQarZvVoQW5M+LJxk8KqFYGvZpqI
R: /etc/ssh/ssh_host_rsa_key.pub
        type: rsa
        fingerprint: SHA256:tSRcjuKPF6W/jcyhqYG7tHlVkcrUZGh0RmwFEEpMPzc
</pre>

</section>
<section id="slide-org435f485">
<h3 id="org435f485">Interacting with APIs from within CFEngine Policy</h3>
<aside class="notes">
<p>
If it's a simple http(s) call you can use the <a href="https://docs.cfengine.com/docs/3.15/reference-functions-url_get.html"><code>url_get()</code> function</a>. It's fairly limited, but we can extend it if we have good real world use cases. For some cases, like POST currently you would need to leverage something like <code>curl</code> directly.
</p>
<ul>
<li>Not usually a huge limitation
<ul>
<li>Do you really <i>want</i> thousands of hosts hitting some api directly?</li>
<li>Authorization for each host/device</li>
<li>Network availability</li>

</ul></li>

</ul>
<p>
Here is a very simple, contrived example working with the JSON returned by wtfismyip.com.
</p>

</aside>

<p>
<a href="examples/example-url_get-wtfismyip-v0.cf">examples/example-url_get-wtfismyip-v0.cf</a>
</p>
<div class="org-src-container">

<pre id="example-url_get-wtfismyip-v0.cf"><code class="cfengine3" >bundle agent example_url_get_wtfismyip_v0
{
  vars:
      # This is the URL that we will query.
      "url" string =&gt; "https://wtfismyip.com/json";

      # We don't need to supply any specific options in this case.
      # url.max_content is a typical setting to change. 4K isn't enough for
      # some, (many?) API responses.
      "options" data =&gt; '{}';

      # Here we make our http(s) call, storing the response in `d`
      "d" data =&gt; url_get( $(url), @(options));

      # The response content is returned as a *string* inside the `content`. In
      # order to work with it, we need to pull it into a proper data container.
      "content" data =&gt; "$(d[content])";

  reports:

      # Let's view the multi-line JSON representation of the `url_get()` response.
      "$(with)" with =&gt; string_mustache( "{{%-top-}}", d);

      # Let's view the multi-line JSON representation of our extracted `content`
      # datacontainer.
      "$(with)" with =&gt; string_mustache( "{{%-top-}}", content);
}
bundle agent __main__{methods:"example_url_get_wtfismyip_v0";}
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org83c67a3">
# cf-agent --no-lock --log-level info --file examples/example-url_get-wtfismyip-v0.cf
R: {
  "content": "{\n    \"YourFuckingIPAddress\": \"24.143.34.87\",\n    \"YourFuckingLocation\": \"Tonganoxie, KS, United States\",\n    \"YourFuckingHostname\": \"24-143-34-87-dynamic.midco.net\",\n    \"YourFuckingISP\": \"Midco\",\n    \"YourFuckingTorExit\": false,\n    \"YourFuckingCountryCode\": \"US\"\n}\n",
  "headers": "HTTP/1.1 200 OK\r\nAccess-Control-Allow-Methods: GET\r\nAccess-Control-Allow-Origin: *\r\nContent-Type: application/json\r\nDate: Fri, 28 Feb 2020 14:23:28 GMT\r\nContent-Length: 268\r\n\r\n",
  "rc": 0,
  "returncode": 200,
  "success": true
}
R: {
  "YourFuckingCountryCode": "US",
  "YourFuckingHostname": "24-143-34-87-dynamic.midco.net",
  "YourFuckingIPAddress": "24.143.34.87",
  "YourFuckingISP": "Midco",
  "YourFuckingLocation": "Tonganoxie, KS, United States",
  "YourFuckingTorExit": false
}
</pre>

<aside class="notes">
<p>
What was the real real use case behind this?
</p>
<ul>
<li>Have Kubernetes running components</li>
<li>Components register them selves Consul</li>
<li>Loadbalancer (running in a container) needs to refresh it's config based on the current Consul data</li>

</ul>

<p>
How is this being accomplished today?
</p>
<ul>
<li>Using <a href="https://github.com/hashicorp/consul-template">Consul template</a>
<ul>
<li>But, it's quite limited
<ul>
<li>Can subscribe to events from consul</li>
<li>Can run a command or render a template when something changes</li>

</ul></li>

</ul></li>

</ul>

<p>
The idea is to run CFEngine (<code>cf-agent</code>) when something changes.
</p>

</aside>

</section>
</section>
<section>
<section id="slide-org1171907">
<h2 id="org1171907">Policy Exercises</h2>
<div class="outline-text-2" id="text-org1171907">
</div>
</section>
<section id="slide-org3233d33">
<h3 id="org3233d33">Edit a file</h3>
<p>
Write a policy that populates <code>/etc/issue</code> with legaleze.
</p>

</section>
<section id="slide-org20a41ca">
<h3 id="org20a41ca">Create local users</h3>
<p>
Write a policy that creates at least 2 users.
</p>

</section>
<section id="slide-org67bfef4">
<h3 id="org67bfef4">Inventory the local users</h3>
<p>
Tag the variable(s) that contain the usernames you promised for <i>inventory</i>.
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >meta =&gt; { "inventory", "attribute_name=My users" }
</code></pre>
</div>

</section>
<section id="slide-org99ccd71">
<h3 id="org99ccd71">Create a file</h3>
<p>
Write a policy that ensures <code>/etc/cron.allow</code> is populated with one of the previously created users allowed to have cron jobs.
</p>

<p>
Switch to a user and try to <code>crontab -e</code>.
</p>

</section>
<section id="slide-org41849df">
<h3 id="org41849df">Inventory users in /etc/cron.allow</h3>
<p>
Inventory the users listed in <code>/etc/cron.allow</code>
</p>
</section>
<section id="slide-orgd01117b">
<h3 id="orgd01117b">Enable sshd banner</h3>
<p>
Write a policy that enables the ssh banner and directs it to <code>/etc/issue</code>. sshd
should be restarted after changing its configuration.
</p>
</section>
<section id="slide-org23b7799">
<h3 id="org23b7799">Install ntpd and configure driftfile</h3>
<ul>
<li>Install ntp</li>
<li>Ensure service is running</li>
<li>Configure path to driftfile <code>/var/lib/ntp/drift</code>?</li>
<li>Make sure service is restarted if configuration file content is altered</li>

</ul>

</section>
<section id="slide-org2a0d509">
<h3 id="org2a0d509">Report</h3>
<p>
Write a policy that defines a name in separate parts (at least 3). Then have
CFEngine report the name in a random order.
</p>

</section>
<section id="slide-orgbf65747">
<h4 id="orgbf65747">Example solution</h4>
<aside class="notes">
<p>
This solution will print the name multiple times, exposing normal order. Can you make it print just once?
</p>

</aside>

<div class="org-src-container">
<label class="org-src-name">examples/example-report-randomized-strings-v0.cf</label>
<pre id="examples/example-report-randomized-strings-v0.cf"><code class="cfengine3" >bundle agent example_report_randomized_strings_v0
{
  vars:
    "name_parts" slist =&gt; { "Ronald", "Mck", "Donald" };
    "shuffled" slist =&gt; shuffle( name_parts, randomint(0, inf) );
    "name" string =&gt; join(" ", shuffled );

  reports:
    "$(name)";
}
bundle agent __main__{methods:"example_report_randomized_strings_v0";}
</code></pre>
</div>

<pre class="example">
R: Ronald Donald Mck
R: Mck Ronald Donald
R: Donald Ronald Mck
</pre>

</section>
<section id="slide-orgc7e251d">
<h3 id="orgc7e251d">Trigger an action when a file changes</h3>
<p>
Write policy to monitor a file for change. When a change is seen report <code>Winner
Winner Chicken Dinner</code>. Manually edit the file, show how cfengine detects and
reports on the change.
</p>

</section>
<section id="slide-org2eaf8be">
<h3 id="org2eaf8be">Automatically abort based on file presence</h3>
<p>
Write a policy that will abort cfengine execution if the file
<code>$(sys.statedir)/abort_agent_execution</code> exists.
</p>

<ul>
<li>See <a href="https://docs.cfengine.com/lts/reference-components-cf-agent.html#abortclasses">abortclasses</a> in the cfengine documentation</li>

</ul>
</section>
<section id="slide-org4fd1c68">
<h3 id="org4fd1c68">Delete file based on age</h3>
<p>
Write a policy that will delete <code>$(sys.statedir)/abort_agent_execution</code> if it is
older than 1 hour.
</p>
</section>
<section id="slide-org4de245a">
<h3 id="org4de245a">Kill a process</h3>
<p>
Write a policy to kill irssi running on webservers. No need for our webservers
to be connected to IRC.
</p>

<pre class="example" id="orgb51a084">
cp /bin/sleep /tmp/irssi
/tmp/irssi 5000
</pre>

</section>
<section id="slide-orgcfb507a">
<h3 id="orgcfb507a">Building on example-url_get-wtfismyip-v0.cf</h3>
<ul>
<li>Let's use the response <i>content</i> from the previous example in a template to manage a file.</li>

</ul>

<p>
<a href="examples/example-url_get-wtfismyip-v1.cf">examples/example-url_get-wtfismyip-v1.cf</a>
</p>
</section>
<section>

</section>
<section>

<ul>
<li>Now, let's extend it further.</li>
<li>After updating the file, let's do something, like run a command or restart a service.</li>
<li><b>hint</b>, define a class as the result of the promise</li>

</ul>

<aside class="notes">
<p>
Here we add the <code>results</code> <i>classes</i> body. It will define bundle (local) scoped classes for the outcomes (kept, notkept, repaired) produced by the promise.
</p>

</aside>

<p>
<a href="examples/example-url_get-wtfismyip-v2.cf">examples/example-url_get-wtfismyip-v2.cf</a>
</p>
</section>
<section>

</section>
<section>

<ul>
<li>Was your subsequent promise actuated?</li>

</ul>

<aside class="notes">
<p>
Rightfully, no commands were executed and no extra report emitted because the file already existed with the desired content. Let's modify the target file so that the files promise will be <i>repaired</i> and subsequently, we will execute commands and emit the extra report.
Modify the promised file so that we have something to repair
</p>

</aside>

</section>
<section>

<ul>
<li>Find the classes that <i>were</i> defined</li>

</ul>

<aside class="notes">
<ul>
<li>Verbose mode</li>
<li><code>--show-evaluated-classes</code></li>
<li><code>classesmatching()</code> <b>winner winner chicken dinner</b></li>

</ul>

</aside>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Modify the promised file so that we have something to repair</label>
<pre><code class="sh" >echo HELLO WORLD &gt; /tmp/file.txt
cat /tmp/file.txt
</code></pre>
</div>

<aside class="notes">
<p>
Now that it differs from what we desire next time we run the policy, it should get repaired.
</p>

</aside>

</section>
<section>

<ul>
<li>File updated?</li>
<li>Classes expected defined?</li>

</ul>

<aside class="notes">
<p>
The file was updated with the desired content as expected.
</p>

<p>
Wait, why was <code>file_content_kept</code> defined? The promise was repaired, why does it also claim to be kept? This is because the promise specified multiple things, both that the file should exist ( <code>create =&gt; "true"</code> ) and the content ( <code>edit_template =&gt; "inline_mustache"</code> ) itself. Let's separate them into discrete promises. Note, in practice this usually does not matter, but it's an important detail to know about.
</p>

</aside>

</section>
<section>

<ul>
<li>Separate the files promise into discrete parts</li>
<li>Again, mess with the file so that it will be repaired</li>

</ul>

</section>
<section>

<aside class="notes">
<p>
Note the <code>file_content_kept</code> is no longer defined.
</p>

</aside>

</section>
<section>

<ul>
<li>Adjust <code>url.max_content</code> size in options for <code>url_get()</code></li>

</ul>

<aside class="notes">
<p>
To increase the max content size, set <code>url.max_content</code> in the options data container. Here I set it to 266, which is 1 byte shy of the size I need to get a valid json response in content (yours will likely be slightly different). That truncates the response and makes for invalid json. Try playing with the size.
</p>

</aside>

</section>
<section>

</section>
<section id="slide-orgc664bd7">
<h3 id="orgc664bd7">Inventory batteries</h3>
<ul>
<li><code>/sys/class/power_supply/BAT*/capacity</code>
<ul>
<li>What batteries are present</li>
<li>What are their capacities</li>
<li>More than 1? Aggregate capacity</li>
<li>Broken batteries?</li>

</ul></li>

</ul>

</section>
<section id="slide-org0532ef4">
<h3 id="org0532ef4">Strip suffixes from a list of filenames</h3>
<p>
Given a list of filenames strip the suffix and get the prefix into a new list.
</p>

<p>
E.g. given a list containing <code>1.txt</code>, <code>2.txt</code>, <code>3.txt</code> produce a list containing <code>1</code>, <code>2</code>, <code>3</code>.
</p>

</section>
<section id="slide-orgc21f74d">
<h3 id="orgc21f74d">Manage files described by a data container</h3>
<div class="org-src-container">

<pre><code class="json" >[
   {
     "name": "/tmp/create-multiple-files-with.content-1.txt",
     "content": "Hello CFEngine!"
   },
   {
     "name": "/tmp/create-multiple-files-with.content-2.txt",
     "content": "Bye CFEngine!"
   }
 ]
</code></pre>
</div>

</section>
</section>
<section>
<section id="slide-org3f48402">
<h2 id="org3f48402">Enterprise Reporting</h2>
<div class="outline-text-2" id="text-org3f48402">
</div>
</section>
<section id="slide-org019f1d1">
<h3 id="org019f1d1">APIs</h3>
<ul>
<li>Host</li>
<li>Inventory</li>
<li>File Changes</li>
<li>Health</li>
<li>Query</li>
<li>Settings
<ul>
<li>Federated Reporting</li>
<li>Import &amp; Export</li>
<li>LDAP</li>
<li>Users</li>
<li>Version Control</li>
<li>RBAC</li>

</ul></li>

</ul>

<aside class="notes">
<ul>
<li>Host API : query for basic host info based on classes reported or not</li>
<li>Inventory: Query for <i>inventory</i> attribute values, filter on classes reported</li>
<li>File Changes:  Query high level statistics about changes observed</li>
<li>Health: Information about CFEngine's operation</li>
<li>Query: SQL Queries</li>
<li>Settings: Configure the Enterprise Hub</li>

</ul>

</aside>

</section>
<section id="slide-org14b05e1">
<h3 id="org14b05e1">Host API</h3>
<div class="org-src-container">

<pre id="hostlist"><code class="sh" >curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/host\?count\=2\&amp;context-include\=cfengine_3_15_0

</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="json" >{
  "data": [
    {
      "firstseen": "1578745699",
      "hostname": "host001.example.com",
      "id": "SHA=e01f65d069b9035c280ea0bdba6cf6e47863ac074a170addbad26e98cc89925c",
      "ip": "192.0.2.1",
      "lastreport": "1582643957"
    },
    {
      "firstseen": "1578745692",
      "hostname": "hub.example.com",
      "id": "SHA=70138d580b9fd292ff856746df2fe7f9ded29db9ffca0c4d83acbbb97cde4d42",
      "ip": "104.236.18.209",
      "lastreport": "1582643974"
    }
  ],
  "meta": {
    "count": 2,
    "page": 1,
    "timestamp": 1582644064,
    "total": 7
  }
}
</code></pre>
</div>

</section>
<section id="slide-orgf649b41">
<h3 id="orgf649b41">Inventory API</h3>
<div class="outline-text-3" id="text-orgf649b41">
</div>
</section>
<section id="slide-org5401673">
<h4 id="org5401673">Inventory API attributes</h4>
<div class="org-src-container">

<pre><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X GET \
  https://$HUB/api/inventory/attributes-dictionary | \
  jq 'map(.attribute_name)[]'
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X GET \
  https://$HUB/api/inventory/attributes-dictionary | \
  jq 'map(.attribute_name)[]'
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org6c2c5c7">
"Policy Release Id"
"EC2 Image ID"
"CPU sockets"
"Uptime minutes"
"System product name"
"System manufacturer"
"SSH Host Key /etc/ssh/ssh_host_rsa_key.pub SHA256 Fingerprint"
"CISOfy Lynis finding count"
"Number linux kernel modules loaded"
"CISOfy Lynis datetime scan completed"
"Unexpected Local Users"
"SSH Host Key /etc/ssh/ssh_host_ecdsa_key.pub SHA256 Fingerprint"
"Last logged in ubuntu"
"Windows roles"
"IPv4 addresses"
"SSH Host Key Type /etc/ssh/ssh_host_ecdsa_key.pub"
"CMDB Business Unit"
"DigitalOcean Droplet ID"
"SSH Host Key Type /etc/ssh/ssh_host_dsa_key.pub"
"BIOS version"
"Memory size (MB)"
"MAC addresses"
"Last logged in cfapache"
"CISOfy Lynis Suggestion SSH-7408 details"
"OS kernel"
"Last logged in root"
"NAT Public IPv4"
"EC2 Instance ID"
"CFEngine ID"
"CISOfy Lynis Version"
"CISOcy Lynis Remediaitons implicitly enabled"
"Volume / Percent Disk Used"
"SSH Host Key Type /etc/ssh/ssh_host_ed25519_key.pub"
"EventLog MaxSize"
"Architecture"
"OS"
"CISOfy Lynis Suggestions"
"Virtual host"
"SSH Host Key Types"
"SSH Host Keys"
"ARRAY CISOcy Lynis Remediaitons implicitly enabled"
"Number linux kernel moduels unused"
"SSH Host Key /etc/ssh/ssh_host_dsa_key.pub SHA256 Fingerprint"
"EventLog Retention"
"CFEngine roles"
"Local Users"
"CMDB Owner"
"CISOfy Lynis Control ID findings"
"SSH Host Key /etc/ssh/ssh_host_ed25519_key.pub SHA256 Fingerprint"
"legal notice caption"
"DigitalOcean Region"
"legal notice"
"Local User"
"Unused linux kernel modules"
"Data Container"
"Last logged in centos"
"CISOfy Lynis Hardening Index"
"CFEngine version"
"CISOfy Lynis Remediations explicitly disabled"
"Host name"
"SSH Host Key Fingerprint (ssh-keygen)"
"System UUID"
"System version"
"Registered Orginization"
"BIOS vendor"
"OS type"
"Disk free (%)"
"CISOfy Lynis Suggestion KRNL-6000 details"
"Ports listening"
"Users who have logged in"
"Last logged in nickanderson"
"EC2 Region"
"Interfaces"
"CISOfy Lynis Warnings"
"EC2 Availability Zone"
"Physical memory (MB)"
"Last logged in cfpostgres"
"Show Last Logged in Username"
"CPU physical cores"
"Volume /tmp Percent Disk Used"
"CPU logical cores"
"Volume /var Percent Disk Used"
"System serial number"
"Systemd services running"
"EC2 Instance Type"
"TestArray"
"Unexpected local user count"
"Used linux kernel modules"
"Registered Owner"
"SSH Host Key Type /etc/ssh/ssh_host_rsa_key.pub"
"CPU model"
"Cloud Provider"
</pre>

</section>
<section id="slide-org148e65d">
<h4 id="org148e65d">Inventory API Query</h4>
<div class="org-src-container">

<pre id="inventory"><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/inventory \
  -H 'content-type: application/json' \
  -d '{
        "sort":"Host name",
        "select":[
           "Host name",
           "OS",
           "Policy Release Id",
           "IPv4 addresses",
           "CFEngine version",
           "Ports listening"
        ],
        "hostContextInclude":[
           "cfengine"
        ],
        "hostContextExclude":[
           "coreos"
        ]
      }
'
</code></pre>
</div>

</section>
<section id="slide-org5bd5c27">
<h3 id="org5bd5c27">Health API</h3>
<div class="org-src-container">
<label class="org-src-name">Get an overview of the health status</label>
<pre><code class="sh" >curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/health-diagnostic/status/ | jq
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="json" >{
  "hostsNeverCollected": 2,
  "notRecentlyCollected": 3,
  "hostsUsingSameIdentity": 0,
  "agentNotRunRecently": 0,
  "lastAgentRunUnsuccessful": 0,
  "totalFailed": 5,
  "total": "8"
}
</code></pre>
</div>

<aside class="notes">
<ul>
<li>Get an overview of the health status</li>
<li>Query for details of each health status</li>

</ul>

</aside>

<div class="org-src-container">

<pre><code class="sh" >curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/health-diagnostic/report_ids | jq
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="json" >
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">Get an overview of the health status</label>
<pre><code class="sh" >curl -s -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/health-diagnostic/report/hostsNeverCollected \
  -H 'Content-Type: application/json' \
  -d '{"limit": 50}' | jq
</code></pre>
</div>

</section>
<section id="slide-org049e2a5">
<h3 id="org049e2a5">Query API</h3>
<aside class="notes">
<ul>
<li>Make complex SQL queries</li>
<li>Make Asynchronous SQL Queries (for long running queries)</li>

</ul>

</aside>

<div class="org-src-container">

<pre id="query-api"><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/query \
  -H 'content-type: application/json' \
  -d '{
        "query": "select hostname, ipaddress from hosts",
        "limit": 2,
        "hostContextExclude": ["policy_server"]
     }'
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="json" >{
  "data": [
    {
      "header": [
        {
          "columnName": "hostname",
          "columnType": "STRING"
        },
        {
          "columnName": "ipaddress",
          "columnType": "STRING"
        }
      ],
      "query": "select hostname, ipaddress from hosts",
      "queryTimeMs": 21,
      "rowCount": 6,
      "rows": [
        [
          "lex-win7-to-10",
          "84.212.143.13"
        ],
        [
          "desktop-aj2m57e",
          "24.143.37.227"
        ]
      ]
    }
  ],
  "meta": {
    "count": 1,
    "page": 1,
    "timestamp": 1597765127,
    "total": 1
  }
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Asynchronous query</label>
<pre id="async-query"><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/query/async \
  -H 'content-type: application/json' \
  -d '{
        "query": "select hostname, ipaddress from hosts",
        "outputType": "csv",
        "limit": 2,
        "hostContextExclude": ["policy_server"]
     }'
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="json" >{
  "data": [
    {
      "id": "0eb39e8f20ed978a8f4b3167730b76fd",
      "query": "select hostname, ipaddress from hosts"
    }
  ],
  "meta": {
    "count": 1,
    "page": 1,
    "timestamp": 1597765332,
    "total": 1
  }
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre id="check-async-query"><code class="sh" >curl -q -k --user $AUTHUSER:$PASSWORD \
  -X GET \
  https://$HUB/api/query/async/0eb39e8f20ed978a8f4b3167730b76fd \
  -H 'content-type: application/json'
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="json" >{
  "data": [
    {
      "href": "https://demohub.a10042.cfengine.com/tmp/0eb39e8f20ed978a8f4b3167730b76fd.csv",
      "id": "0eb39e8f20ed978a8f4b3167730b76fd",
      "percentageComplete": 100
    }
  ],
  "meta": {
    "count": 1,
    "page": 1,
    "timestamp": 1597765595,
    "total": 1
  }
}
</code></pre>
</div>

</section>
<section id="slide-org1b76b3d">
<h4 id="org1b76b3d">Base64 encoded query links</h4>
<aside class="notes">
<ul>
<li>An alternative to "Saved Reports"</li>

</ul>

</aside>

<div class="org-src-container">

<pre><code class="sh" >HUB_URL="https://hub"
API="/index.php/advancedreports/#/report/run?sql="
SQL_QUERY="SELECT Hosts.HostName AS 'Host Name' FROM Hosts"
REPORT_TITLE="Example Report"
LINK="${HUB_URL}${API}$(echo ${SQL_QUERY} | \
       base64)&amp;title=$(/usr/bin/urlencode ${REPORT_TITLE})"
echo "${LINK}"
</code></pre>
</div>

</section>
<section id="slide-org063df8a">
<h3 id="org063df8a">Actions</h3>
<p>
Actions API enables you to perform specific actions such a requesting report collection and triggering un-scheduled agent runs.
</p>

<p>
Note: Triggered actions (agent run, report collection) will not work for hosts that the hub cannot initiate connections to, e.g. hosts behind NAT.
</p>

</section>
<section id="slide-org1f615fe">
<h4 id="org1f615fe">Trigger report collection</h4>
<div class="org-src-container">
<label class="org-src-name">API call to trigger report collection</label>
<pre><code class="sh" >exec 2&gt;&amp;1
/var/cfengine/bin/curl \
    --insecure \
    --user admin:admin \
    --write-out "HTTP %{response_code}" \
    --request POST \
    -H 'content-tyupe: application/json' \
    -d '{"hostkey": "SHA=55425b6c6c5fcd1ea7f00cf45736a3acd87a3503dc61abaf268ca59f47fe4a05" }' \
    https://hub.example.com/api/actions/report_collection
:
</code></pre>
</div>

<pre class="example">
Array
HTTP 202
</pre>

</section>
<section id="slide-org27b7e96">
<h4 id="org27b7e96">Trigger agent run</h4>
<div class="org-src-container">
<label class="org-src-name">API call to trigger agent run</label>
<pre><code class="sh" >exec 2&gt;&amp;1
/var/cfengine/bin/curl \
    --insecure \
    --user admin:admin \
    --write-out "HTTP %{response_code}" \
    --request POST \
    -H 'content-tyupe: application/json' \
    -d '{"hostkey": "SHA=55425b6c6c5fcd1ea7f00cf45736a3acd87a3503dc61abaf268ca59f47fe4a05" }' \
    https://hub.example.com/api/actions/agent_run
:
</code></pre>
</div>

<pre class="example">
{
"output" : "",
"exit_code": 0
}

HTTP 202
</pre>

</section>
</section>
<section>
<section id="slide-org99490e6">
<h2 id="org99490e6">What's New</h2>
<div class="outline-text-2" id="text-org99490e6">
</div>
</section>
<section id="slide-org7c410e4">
<h3 id="org7c410e4">Coming up in 3.21&#x2026;</h3>
</section>
<section id="slide-orgc47ca5c">
<h3 id="orgc47ca5c">In 3.20</h3>
<ul>
<li>Build in Mission Portal</li>

</ul>
</section>
<section id="slide-org62f5f91">
<h3 id="org62f5f91">In 3.19</h3>
<ul>
<li>Importable Compliance Reports in Mission Portal</li>

</ul>
</section>
<section id="slide-org57121cb">
<h3 id="org57121cb">In 3.18</h3>
<ul>
<li>Host specific data (CMDB) in Mission Portal</li>
<li>More powerful Augments syntax</li>
<li>Custom promise types</li>
<li>Compliance Reports in Mission Portal</li>
<li>New functions:
<ul>
<li><code>findfiles_up()~/~search_up()</code></li>
<li><code>int()</code></li>
<li><code>string()</code></li>
<li><code>type()</code></li>

</ul></li>

</ul>

</section>
<section id="slide-org6db4c23">
<h3 id="org6db4c23">In 3.17</h3>
<ul>
<li>New functions:
<ul>
<li><code>execresult_as_data()</code></li>

</ul></li>
<li>New function options:
<ul>
<li><code>execresult()</code> can capture <i>stdout</i>, <i>stderr</i>, or <i>both</i></li>

</ul></li>

</ul>
</section>
<section id="slide-org5544e3c">
<h3 id="org5544e3c">In 3.16</h3>
<div class="outline-text-3" id="text-org5544e3c">
</div>
</section>
<section id="slide-org7081fb3">
<h4 id="org7081fb3">Components</h4>
<pre class="example" id="orgd41ac5c">
Usage: cf-secret COMMAND [OPTIONS] [FILE]

Commands:
  encrypt      - Encrypt data for one or more hosts/keys.
                 Usage: cf-secret encrypt -k/-H KEY/HOST -o OUTPUT INPUT
  decrypt      - Decrypt data.
                 Usage: cf-secret decrypt [-k/-H KEY/HOST] -o OUTPUT INPUT
  print-headers - Print headers from an encrypted file.
                 Usage: cf-secret print-headers ENCRYPTED_FILE

Options:
  --help        , -h       - Print the help message
  --manpage     , -M       - Print the man page
  --debug       , -d       - Enable debugging output
  --verbose     , -v       - Enable verbose output
  --log-level   , -g value - Specify how detailed logs should be. Possible values: 'error', 'warning', 'notice', 'info', 'verbose', 'debug'
  --inform      , -I       - Enable basic information output
  --key         , -k value - Comma-separated list of key files to use (one of -k/-H options is required for encryption)
  --host        , -H value - Comma-separated list of hosts to encrypt/decrypt for (defaults to 'localhost' for decryption)
  --output      , -o value - Output file (required)

Website: http://www.cfengine.com
This software is Copyright (C) 2008,2010-present Northern.tech AS.
</pre>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Encrypt data with cf-secret from STDIN</label>
<pre><code class="sh" >cf-secret encrypt \
  --key ~/.cfagent/ppkeys/localhost.pub \
  --output /tmp/secrets.json.cfsecret \
  &lt;\(echo '{ "username": "secret_user", "password": "secret_token" }'\)
cf-secret print-headers /tmp/secrets.json.cfsecret
</code></pre>
</div>

<pre class="example">
Version: 1.0
Encrypted-for: SHA=43c979e264924d0b4a2d3b568d71ab8c768ef63487670f2c51cd85e8cec63834
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Using cf-secret binary from policy</label>
<pre><code class="cfengine3" >bundle agent example_load_encrypted_data
{
  vars:
      "decrypt_cmd"
        string =&gt; concat( "$(sys.bindir)/cf-secret decrypt ",
                          "--key $(sys.workdir)/ppkeys/localhost.priv ",
                          "--output - ",
                          "/tmp/secrets.json.cfsecret" );

      "d" data =&gt; parsejson( execresult( $(decrypt_cmd), noshell) );

  reports:
      "username: $(d[username])";
      "password: $(d[password])";
}
bundle agent __main__
{
  methods:
      "example_load_encrypted_data";
}
</code></pre>
</div>

<pre class="example">
R: username: secret_user
R: password: secret_token
</pre>

</section>
<section id="slide-org72e0756">
<h4 id="org72e0756">Promise attributes</h4>
<div class="org-src-container">
<label class="org-src-name">Example illustrating files content attribute</label>
<pre><code class="cfengine3" >bundle agent example_file_content
# @brief Example showing files content
{
  files:
      "/tmp/hello_string"
        create =&gt; "true",
        content =&gt; "Hello from string!";

  reports:
      "/tmp/hello_string"
        printfile =&gt; cat( $(this.promiser) );
}

bundle agent __main__
{
  methods: "example_file_content";
}
</code></pre>
</div>

<pre class="example" id="orged927ea">
    info: Created file '/tmp/hello_string', mode 0600
    info: Updated content of '/tmp/hello_string' with content 'Hello from string!'
    info: files promise '/tmp/hello_string' repaired
R: /tmp/hello_string
R: Hello from string!
</pre>

</section>
<section id="slide-org9470551">
<h4 id="org9470551">Functions</h4>
<p>
Complementary to new macros:
</p>
<ul>
<li><code>cf_version_after()</code></li>
<li><code>cf_version_at()</code></li>
<li><code>cf_version_before()</code></li>
<li><code>cf_version_between()</code></li>
<li><code>cf_version_maximum()</code></li>
<li><code>cf_version_maximum()</code></li>
<li><code>cf_version_minimum()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Example showing cf_after_version() function</label>
<pre><code class="cfengine3" >bundle agent example_cf_after_version_function
{
  reports:
      "$(sys.cf_version) is newer than 3.7.0"
        if =&gt; cf_version_after("3.7.0");

      "$(sys.cf_version) is NOT newer than 3.7.0"
        unless =&gt; cf_version_after("3.7.0");
}
bundle agent __main__
{
  methods: "example_cf_after_version_function";
}
</code></pre>
</div>

<pre class="example">
R: 3.17.0a.82c3b3656 is newer than 3.7.0
</pre>


</section>
<section>

<p>
Manipulating strings:
</p>
<ul>
<li><code>string_trim()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Example showing string_trim()</label>
<pre><code class="cfengine3" >bundle agent example_string_trim
{
  vars:
    "my_string" string =&gt; " Trim me please ";
  reports:
      "my_string: '$(with)'"
         with =&gt; $(my_string);

      "my_string trimmed: '$(with)'"
         with =&gt; string_trim( $(my_string) );

}
bundle agent __main__
{
  methods: "example_string_trim";
}
</code></pre>
</div>

<pre class="example">
R: my_string: ' Trim me please '
R: my_string trimmed: 'Trim me please'
</pre>


</section>
<section>

<p>
Data validation:
</p>
<ul>
<li><code>validdata()</code></li>
<li><code>validjson()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Example showing string_trim()</label>
<pre><code class="cfengine3" >bundle agent example_validjson
{
  vars:
    "valid_json" string =&gt; '{ "valid": "json" }';
    "invalid_json" string =&gt; '{ "invalid": "json"';
  reports:
      "valid_json is valid json"
         if =&gt; validjson( $(valid_json) );

      "valid_json is NOT valid json"
         unless =&gt; validjson( $(invalid_json) );

}
bundle agent __main__
{
  methods: "example_validjson";
}
</code></pre>
</div>

<pre class="example">
R: valid_json is valid json
R: valid_json is NOT valid json
</pre>

</section>
<section id="slide-orga9946fb">
<h4 id="orga9946fb">Macros</h4>
<ul>
<li><code>maximum_version</code></li>
<li><code>else</code></li>
<li><code>at_version</code></li>
<li><code>between_versions</code></li>
<li><code>before_version</code></li>
<li><code>after_version</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Example showing after_version and else macros</label>
<pre><code class="cfengine3" >bundle agent example_macros_new_in_cfengine_3_16
{
@if after_version(3.7.0)
  reports:
      "$(sys.cf_version) is newer than 3.7.0";
@else
      "$(sys.cf_version) is NOT newer than 3.7.0";
@endif
}
bundle agent __main__
{
  methods: "example_macros_new_in_cfengine_3_16";
}
</code></pre>
</div>

<pre class="example">
R: 3.17.0a.82c3b3656 is newer than 3.7.0
</pre>

</section>
<section id="slide-org39562f2">
<h4 id="org39562f2">Enterprise Edition</h4>
<ul>
<li>Compliance Reports</li>

</ul>
</section>
<section id="slide-org4a9fcf4">
<h3 id="org4a9fcf4">In 3.15</h3>
<div class="outline-text-3" id="text-org4a9fcf4">
</div>
</section>
<section id="slide-org5432af7">
<h4 id="org5432af7">Functions</h4>
<ul>
<li><code>basename()</code></li>
<li><code>read_module_protocol()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Example illustrating basename()</label>
<pre><code class="cfengine3" >bundle agent example_basename
{
  vars:
      "basename" -&gt; { "CFE-3196" }
        string =&gt; basename( $(this.promise_filename) );

      "basename_wo_extension" -&gt; { "CFE-3196" }
        string =&gt; basename( $(this.promise_filename), ".cf" );
  reports:

      "basename = '$(basename)'";
      "basename without '.cf' extension = '$(basename_wo_extension)'";
}
</code></pre>
</div>

<pre class="example">
# cf-agent --bundlesequence example_basename --no-lock --log-level info --file /home/nickanderson/src/presentations/state-of-the-cfengine/cfengine3-NiK6sU
    info: Using command line specified bundlesequence
R: basename = 'cfengine3-NiK6sU'
R: basename without '.cf' extension = 'cfengine3-NiK6sU'
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/read_module_protocol.cf</label>
<pre><code class="cfengine3" >bundle agent cache_maintenance
# Creates a module protocol cache, refreshes it if minute is 30-35
{
  vars:
      "file"
        string =&gt; "$(this.promise_dirname)/cached_module";

  classes:
      "cache_refresh"
        if =&gt; not(fileexists("$(file)"));
    Min30_35::
      "cache_refresh";

  files:
    cache_refresh::
      "$(file)"
        create =&gt; "true",
        template_method =&gt; "inline_mustache",
        edit_template_string =&gt; "=my_variable=$(sys.date)";
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent demo
# Demonstrates read_module_protocol function, prints a variable from it
{
  classes:
      "cache_was_read"
        if =&gt; read_module_protocol("$(cache_maintenance.file)");

  reports:
    cache_was_read::
      "Module cache was read!";
      "cached_module.my_variable = $(cached_module.my_variable)";
}
bundle agent __main__
{
  methods:
      "cache_maintenance"
        handle =&gt; "cache_maintenance_done";
      "demo"
        depends_on =&gt; { "cache_maintenance_done" };
}
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: Module cache was read!
R: cached_module.my_variable = Mon Feb  3 05:32:05 2020
</pre>

</section>
<section id="slide-org8a8c452">
<h3 id="org8a8c452">In 3.14</h3>
<div class="outline-text-3" id="text-org8a8c452">
</div>
</section>
<section id="slide-org7b42fa2">
<h4 id="org7b42fa2">Functions</h4>
<ul>
<li><code>classfiltercsv()</code> (back-ported to 3.12.1)</li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/classfiltercsv.csv</label>
<pre><code class="csv" >ClassExpr,Sort,Token,Value
# This is a comment
any,A,net.ipv4.ip_forward,ANYVALUE
example_class1,z,net.ipv4.ip_forward,ANYVALUE
example_class2,a,net.ipv4.ip_forward,127.0.0.3
not_defined,Z,net.ipv4.ip_forward,NOT_DEFINED
example_class3.example_class2.example_class1,1,net.ipv4.ip_forward,127.0.0.4
also_undefined,0,net.ipv4.ip_forward,NOT_DEFINED
</code></pre>
</div>

</section>
<section>

<p>
<b>NOTE:</b> CRLF (Windows/DOS)  line endings required per RFC
</p>

<div class="org-src-container">

<pre><code class="sh" >dos2unix ./examples/classfiltercsv.csv
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/classfiltercsv.cf</label>
<pre id="example_classfiltercsv"><code class="cfengine3" >bundle agent example_classfiltercsv
{
  classes:
      "example_class1";
      "example_class2";
      "example_class3";

  vars:
      "data_file"
        string =&gt; "$(this.promise_dirname)/examples/classfiltercsv.csv";
      "d" data =&gt; classfiltercsv($(data_file), "true", 0, 1);

  reports:
      "Filtered data: $(with)" with =&gt; string_mustache("{{%-top-}}", d);
}
bundle agent __main__
{
  methods: "example_classfiltercsv";
}
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org89c518d">
R: Filtered data: [
  {
    "Sort": "1",
    "Token": "net.ipv4.ip_forward",
    "Value": "127.0.0.4"
  },
  {
    "Sort": "A",
    "Token": "net.ipv4.ip_forward",
    "Value": "ANYVALUE"
  },
  {
    "Sort": "a",
    "Token": "net.ipv4.ip_forward",
    "Value": "127.0.0.3"
  },
  {
    "Sort": "z",
    "Token": "net.ipv4.ip_forward",
    "Value": "ANYVALUE"
  }
]
</pre>

</section>
<section id="slide-org1732958">
<h3 id="org1732958">In 3.13</h3>
<div class="outline-text-3" id="text-org1732958">
</div>
</section>
<section id="slide-org1a1b067">
<h4 id="org1a1b067">Functions</h4>
<ul>
<li><code>string_replace()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/string_replace.cf</label>
<pre><code class="cfengine3" >bundle agent example_string_replace
{
  vars:
      "my_string"
        string =&gt; "Bash is the best config management tool";
  reports:
      "$(with)" with =&gt; string_replace( $(my_string),
                                        "Bash", "CFEngine" );
}
bundle agent __main__
{
  methods: "example_string_replace";
}
</code></pre>
</div>

<pre class="example">
R: CFEngine is the best config management tool
</pre>

</section>
<section id="slide-orgb2782a2">
<h3 id="orgb2782a2">In 3.12</h3>
<div class="outline-text-3" id="text-orgb2782a2">
</div>
</section>
<section id="slide-orgdbeff44">
<h4 id="orgdbeff44">Functions</h4>
<ul>
<li><code>hash_to_int()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/hash_to_int.cf</code></label>
<pre id="=examples/hash_to_int.cf="><code class="cfengine3" >bundle agent example_hash_to_int
{
  vars:
      "hello"  int =&gt; hash_to_int(0, 1000, "hello");
      "world"  int =&gt; hash_to_int(0, 1000, "world");

      # Hash can vary on hostkey or policy hub:
      "hour"   int =&gt; hash_to_int(0, 24, "$(sys.key_digest)");
      "minute" int =&gt; hash_to_int(0, 60, "$(sys.policy_hub)");

  reports:
      "'hello' hashed to: $(hello)";
      "'world' hashed to: $(world)";

}
bundle agent __main__{methods: "example_hash_to_int";}
</code></pre>
</div>

<pre class="example">
R: 'hello' hashed to: 172
R: 'world' hashed to: 760
</pre>
</section>
<section id="slide-org892fcf2">
<h4 id="org892fcf2">Library <span class="underline"><span class="underline">main</span></span> bundles</h4>
<ul>
<li>Default bundle per policy file</li>
<li>Useful for testing</li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/library__main__/example_library__main__1.cf</code></label>
<pre id="=examples/library__main__/example_library__main__1.cf="><code class="cfengine3" >bundle agent example_library__main__1
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__1";
}
</code></pre>
</div>

</section>
<section>

<p>
What output do you get when you run the policy file ?
</p>

<div class="org-src-container">
<label class="org-src-name">Executing <code>examples/library__main__/example_library__main__1.cf</code></label>
<pre id="Executing =examples/library__main__/example_library__main__1.cf="><code class="sh" >cf-agent -KIf ./example_library__main__1.cf
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: Hello from example_library__main__1
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/library__main__/example_library__main__2.cf</code></label>
<pre id="=examples/library__main__/example_library__main__2.cf="><code class="cfengine3" >bundle agent example_library__main__2
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__2";
}
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">Executing <code>examples/library__main__/example_library__main__2.cf</code></label>
<pre id="Executing =examples/library__main__/example_library__main__2.cf="><code class="sh" >cf-agent -KIf ./example_library__main__2.cf
</code></pre>
</div>

<pre class="example">
R: Hello from example_library__main__2
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/library__main__/example_library__main__.cf</code></label>
<pre id="=examples/library__main__/example_library__main__.cf="><code class="cfengine3" >body file control
{
  inputs =&gt; {
              "example_library__main__1.cf",
              "example_library__main__2.cf",
            };
}
bundle agent example_library__main__
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  vars: "b" slist =&gt; bundlesmatching( "example_.*" );
  methods:
      "example_library__main__";
      "example_library__main__1";
      "example_library__main__2";
  reports: "$(b)";
}
</code></pre>
</div>

</section>
<section>

<p>
What output do you get when you run the policy file ?
</p>

<div class="org-src-container">
<label class="org-src-name">Executing <code>examples/library__main__/example_library__main__.cf</code></label>
<pre id="Executing =examples/library__main__/example_library__main__.cf="><code class="sh" >cf-agent -KIf ./example_library__main__.cf
</code></pre>
</div>

</section>
<section>

<pre class="example" id="org98b46a0">
example_library__main__1.cf
example_library__main__2.cf
example_library__main__.cf
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs =&gt; { '$(sys.libdir)/stdlib.cf' };
}

bundle agent example_library__main__1
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__1";
}
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs =&gt; { '$(sys.libdir)/stdlib.cf' };
}

bundle agent example_library__main__2
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__2";
}
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs =&gt; { '$(sys.libdir)/stdlib.cf' };
}

body file control
{
  inputs =&gt; {
              "example_library__main__1.cf",
              "example_library__main__2.cf",
            };
}
bundle agent example_library__main__
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  vars: "b" slist =&gt; bundlesmatching( "example_.*" );
  methods:
      "example_library__main__";
      "example_library__main__1";
      "example_library__main__2";
  reports: "$(b)";
}
R: Hello from example_library__main__
   error: A method attempted to use a bundle 'example_library__main__1' that was apparently not defined
   error: A method attempted to use a bundle 'example_library__main__2' that was apparently not defined
</pre>


</section>
<section id="slide-orgf74fa4a">
<h4 id="orgf74fa4a">&#x2013;log-level option</h4>
<div class="org-src-container">
<label class="org-src-name"><code>examples/example_log_level_inform.cf</code></label>
<pre id="=examples/example_log_level_inform.cf="><code class="cfengine3" >bundle agent main
{
  reports:
    inform_mode:: "Running with info level logging";
}
</code></pre>
</div>

<pre class="example">
# cf-agent --no-lock --inform --file ./examples/example_log_level_inform.cf
R: Running with info level logging
</pre>


<pre class="example">
# cf-agent --no-lock --log-level inform --file ./examples/example_log_level_inform.cf
R: Running with info level logging
</pre>

</section>
<section id="slide-org43070eb">
<h4 id="org43070eb">Promise attributes</h4>
<ul>
<li><code>copy_from</code> body attribute <code>missing_ok</code> allows missing upstream files to be considered promise kept</li>
<li>files promise <code>template_method</code> accepts <i>inline_mustache</i></li>
<li>files promise <code>edit_template_string</code>  defines inline mustache</li>

</ul>

<aside class="notes">
<ul>
<li>missing_ok useful for things like downloading host specific data that may or may not exist</li>
<li>inline_mustache easier usage for small templates</li>

</ul>

</aside>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>./examples/whats_new_3_12_missing_ok.cf</code></label>
<pre id="=./examples/whats_new_3_12_missing_ok.cf="><code class="cfengine3" >bundle agent example_missing_ok
{
  vars:
    copy_from_missing_ok_reached::
      "_c"
        string =&gt; string_mustache( "{{%-top-}}",
                                   sort( classesmatching( "copy_from_.*" ), lex));
  files:
      "/tmp/copied_from_missing_ok"
        copy_from =&gt; missing_ok( "/var/cfengine/masterfiles/missing" ),
        classes =&gt; results("bundle", "copy_from_missing_ok");

  reports:
      "$(_c)" if =&gt; isvariable( _c );
}
body copy_from missing_ok( file_path )
{
        source =&gt; "$(file_path)";
        missing_ok =&gt; "true";
}
bundle agent __main__{methods:"example_missing_ok";}
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: [
  "copy_from_missing_ok_kept",
  "copy_from_missing_ok_reached"
]
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name"><code>examples/whats_new_3_12_inline_mustache.cf</code></label>
<pre id="=examples/whats_new_3_12_inline_mustache.cf="><code class="cfengine3" >bundle agent example_inline_mustache
{
  vars:
    "d" data =&gt; '{
  "Name": "Bruce Wayne",
  "Secret Identity": "Batman"
}';

  files:
    "/tmp/$(this.bundle)"
        create =&gt; "true",
        template_method =&gt; "inline_mustache",
        template_data =&gt; @(d),
        edit_template_string =&gt; 'Did you know that {{{Name}}}
... is really {{{Secret Identity}}}!?';

  reports:
    "/tmp/$(this.bundle)" printfile =&gt; cat( $(this.promiser) );
}
bundle agent __main__{methods:"example_inline_mustache";}
</code></pre>
</div>

</section>
<section>

<pre class="example">
# cf-agent --no-lock --file examples/whats_new_3_12_inline_mustache.cf
R: /tmp/example_inline_mustache
R: Did you know that Bruce Wayne
R: ... is really Batman!?
</pre>

</section>
<section id="slide-orgbf05e52">
<h4 id="orgbf05e52">sys vars</h4>
<ul>
<li>sys.policy_entry*</li>
<li></li>

</ul>
</section>
<section id="slide-orgcaff774">
<h3 id="orgcaff774">In 3.11</h3>
<div class="outline-text-3" id="text-orgcaff774">
</div>
</section>
<section id="slide-orga674d14">
<h4 id="orga674d14">Promise attributes</h4>
<ul>
<li><code>with</code></li>

</ul>

</section>
<section id="slide-orgceafee0">
<h4 id="orgceafee0">Functions</h4>
<ul>
<li><code>data_sysctlvalues()</code></li>
<li><code>readenvfile()</code></li>
<li><code>sysctlvalue()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/data_sysctlvalues.cf</label>
<pre><code class="cfengine3" >bundle agent example_data_sysctlvalues
{
  vars:
      "_d" data =&gt; data_sysctlvalues();
  reports:
      "$(with)"
        with =&gt; string_mustache( "{{%-top-}}", _d );
}
bundle agent __main__
{
      methods: "example_data_sysctlvalues";
}
</code></pre>
</div>

<pre class="example" id="org4bd4449">
R: {
  "abi.vsyscall32": "1",
  "debug.exception-trace": "1",
  "debug.kprobes-optimization": "1",
  "dev.cdrom.autoclose": "1",
  "dev.cdrom.autoeject": "0",
  "dev.cdrom.check_media": "0",
  "dev.cdrom.debug": "0",
  "dev.cdrom.info": "CD-ROM information, Id: cdrom.c 3.20 2003/12/17\n\ndrive name:\t\ndrive speed:\t\ndrive # of slots:\nCan close tray:\t\nCan open tray:\t\nCan lock tray:\t\nCan change speed:\nCan select disk:\nCan read multisession:\nCan read MCN:\t\nReports media changed:\nCan play audio:\t\nCan write CD-R:\t\nCan write CD-RW:\nCan read DVD:\t\nCan write DVD-R:\nCan write DVD-RAM:\nCan read MRW:\t\nCan write MRW:\t\nCan write RAM:\t",
  "dev.cdrom.lock": "0",
  "dev.hpet.max-user-freq": "64",
  "dev.i915.oa_max_sample_rate": "100000",
  "dev.i915.perf_stream_paranoid": "1",
  "dev.mac_hid.mouse_button2_keycode": "97",
  "dev.mac_hid.mouse_button3_keycode": "100",
  "dev.mac_hid.mouse_button_emulation": "0",
  "dev.parport.default.spintime": "500",
  "dev.parport.default.timeslice": "200",
  "dev.raid.speed_limit_max": "200000",
  "dev.raid.speed_limit_min": "1000",
  "dev.scsi.logging_level": "0",
  "dev.tty.ldisc_autoload": "1",
  "fs.aio-max-nr": "65536",
  "fs.aio-nr": "3301",
  "fs.binfmt_misc.cli": "enabled\ninterpreter /usr/lib/binfmt-support/run-detectors\nflags: \noffset 0\nmagic 4d5a",
  "fs.binfmt_misc.jar": "enabled\ninterpreter /usr/bin/jexec\nflags: \noffset 0\nmagic 504b0304",
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  "net.ipv4.tcp_comp_sack_nr": "44",
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  "net.ipv4.tcp_thin_linear_timeouts": "0",
  "net.ipv4.tcp_timestamps": "1",
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  "net.ipv6.auto_flowlabels": "1",
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  "net.ipv6.conf.all.mtu": "1280",
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  "net.ipv6.conf.all.router_solicitation_max_interval": "3600",
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  "net.ipv6.conf.docker0.enhanced_dad": "1",
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  "net.ipv6.conf.docker0.keep_addr_on_down": "0",
  "net.ipv6.conf.docker0.max_addresses": "16",
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  "net.ipv6.conf.docker0.mc_forwarding": "0",
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  "net.ipv6.conf.docker0.mtu": "1500",
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  "net.ipv6.conf.docker0.regen_max_retry": "3",
  "net.ipv6.conf.docker0.router_probe_interval": "60",
  "net.ipv6.conf.docker0.router_solicitation_delay": "1",
  "net.ipv6.conf.docker0.router_solicitation_interval": "4",
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  "net.ipv6.conf.docker0.router_solicitations": "-1",
  "net.ipv6.conf.docker0.seg6_enabled": "0",
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  "net.ipv6.conf.docker0.use_tempaddr": "2",
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R: {
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  "kernel.seccomp.actions_avail": "kill_process kill_thread trap errno user_notif trace log allow",
  "kernel.seccomp.actions_logged": "kill_process kill_thread trap errno user_notif trace log",
  "kernel.sem": "32000\t1024000000\t500\t32000",
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  "net.ipv4.conf.default.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.default.log_martians": "0",
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  "net.ipv4.conf.lo.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.lo.log_martians": "0",
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  "net.ipv4.conf.lo.src_valid_mark": "0",
  "net.ipv4.conf.lo.tag": "0",
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  "net.ipv6.conf.eth0.mtu": "1500",
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  "net.ipv6.conf.eth0.router_probe_interval": "60",
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  "net.ipv6.conf.eth0.router_solicitation_interval": "4",
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  "net.ipv6.conf.lo.accept_dad": "-1",
  "net.ipv6.conf.lo.accept_ra": "1",
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  "net.ipv6.conf.lo.accept_ra_rtr_pref": "1",
  "net.ipv6.conf.lo.accept_redirects": "1",
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  "net.ipv6.conf.lo.addr_gen_mode": "0",
  "net.ipv6.conf.lo.autoconf": "1",
  "net.ipv6.conf.lo.dad_transmits": "1",
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  "net.ipv6.conf.lo.drop_unsolicited_na": "0",
  "net.ipv6.conf.lo.enhanced_dad": "1",
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  "net.ipv6.conf.lo.force_tllao": "0",
  "net.ipv6.conf.lo.forwarding": "0",
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  "net.ipv6.conf.lo.ignore_routes_with_linkdown": "0",
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  "kernel.sched_domain.cpu1.domain1.busy_factor": "32",
  "kernel.sched_domain.cpu1.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu1.domain1.flags": "4655",
  "kernel.sched_domain.cpu1.domain1.imbalance_pct": "117",
  "kernel.sched_domain.cpu1.domain1.max_interval": "8",
  "kernel.sched_domain.cpu1.domain1.max_newidle_lb_cost": "24027",
  "kernel.sched_domain.cpu1.domain1.min_interval": "4",
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  "kernel.sched_domain.cpu2.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu2.domain0.flags": "4783",
  "kernel.sched_domain.cpu2.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu2.domain0.max_interval": "4",
  "kernel.sched_domain.cpu2.domain0.max_newidle_lb_cost": "25333",
  "kernel.sched_domain.cpu2.domain0.min_interval": "2",
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  "kernel.sched_domain.cpu2.domain1.flags": "4655",
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  "kernel.sched_domain.cpu2.domain1.max_interval": "8",
  "kernel.sched_domain.cpu2.domain1.max_newidle_lb_cost": "20159",
  "kernel.sched_domain.cpu2.domain1.min_interval": "4",
  "kernel.sched_domain.cpu2.domain1.name": "MC",
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  "kernel.sched_domain.cpu3.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu3.domain0.flags": "4783",
  "kernel.sched_domain.cpu3.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu3.domain0.max_interval": "4",
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  "kernel.sched_domain.cpu3.domain0.min_interval": "2",
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  "kernel.sched_domain.cpu3.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu3.domain1.flags": "4655",
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  "kernel.sched_domain.cpu3.domain1.max_interval": "8",
  "kernel.sched_domain.cpu3.domain1.max_newidle_lb_cost": "20639",
  "kernel.sched_domain.cpu3.domain1.min_interval": "4",
  "kernel.sched_domain.cpu3.domain1.name": "MC",
  "kernel.sched_latency_ns": "18000000",
  "kernel.sched_migration_cost_ns": "500000",
  "kernel.sched_min_granularity_ns": "2250000",
  "kernel.sched_nr_migrate": "32",
  "kernel.sched_rr_timeslice_ms": "100",
  "kernel.sched_rt_period_us": "1000000",
  "kernel.sched_rt_runtime_us": "950000",
  "kernel.sched_schedstats": "0",
  "kernel.sched_tunable_scaling": "1",
  "kernel.sched_util_clamp_max": "1024",
  "kernel.sched_util_clamp_min": "1024",
  "kernel.sched_wakeup_granularity_ns": "3000000",
  "kernel.seccomp.actions_avail": "kill_process kill_thread trap errno user_notif trace log allow",
  "kernel.seccomp.actions_logged": "kill_process kill_thread trap errno user_notif trace log",
  "kernel.sem": "32000\t1024000000\t500\t32000",
  "kernel.sem_next_id": "-1",
  "kernel.sg-big-buff": "32768",
  "kernel.shm_next_id": "-1",
  "kernel.shm_rmid_forced": "0",
  "kernel.shmall": "18446744073692774399",
  "kernel.shmmax": "18446744073692774399",
  "kernel.shmmni": "4096",
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  "kernel.softlockup_panic": "0",
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  "kernel.sysctl_writes_strict": "1",
  "kernel.sysrq": "176",
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  "kernel.version": "#46-Ubuntu SMP PREEMPT Fri Jul 10 01:43:58 UTC 2020",
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  "kernel.watchdog_cpumask": "0-7",
  "kernel.watchdog_thresh": "10",
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  "net.bridge.bridge-nf-call-iptables": "1",
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  "net.core.bpf_jit_enable": "1",
  "net.core.busy_poll": "0",
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  "net.core.default_qdisc": "fq_codel",
  "net.core.dev_weight": "64",
  "net.core.dev_weight_rx_bias": "1",
  "net.core.dev_weight_tx_bias": "1",
  "net.core.devconf_inherit_init_net": "0",
  "net.core.fb_tunnels_only_for_init_net": "0",
  "net.core.flow_limit_cpu_bitmap": "00",
  "net.core.flow_limit_table_len": "4096",
  "net.core.gro_normal_batch": "8",
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  "net.core.max_skb_frags": "17",
  "net.core.message_burst": "10",
  "net.core.message_cost": "5",
  "net.core.netdev_budget": "300",
  "net.core.netdev_budget_usecs": "2000",
  "net.core.netdev_max_backlog": "1000",
  "net.core.netdev_rss_key": "de:cd:e7:76:dc:fb:d8:5b:ab:b6:d5:97:d1:14:ce:ac:14:23:a7:c9:07:b3:4a:e9:82:f2:a3:7d:ae:37:21:8f:0b:90:09:47:6b:9d:d6:b2:7b:40:f1:62:fd:a4:b4:a2:cb:29:72:f0",
  "net.core.netdev_tstamp_prequeue": "1",
  "net.core.optmem_max": "20480",
  "net.core.rmem_default": "212992",
  "net.core.rmem_max": "212992",
  "net.core.rps_sock_flow_entries": "0",
  "net.core.somaxconn": "4096",
  "net.core.tstamp_allow_data": "1",
  "net.core.warnings": "0",
  "net.core.wmem_default": "212992",
  "net.core.wmem_max": "212992",
  "net.core.xfrm_acq_expires": "30",
  "net.core.xfrm_aevent_etime": "10",
  "net.core.xfrm_aevent_rseqth": "2",
  "net.core.xfrm_larval_drop": "1",
  "net.ipv4.cipso_cache_bucket_size": "10",
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  "net.ipv4.cipso_rbm_optfmt": "0",
  "net.ipv4.cipso_rbm_strictvalid": "1",
  "net.ipv4.conf.all.accept_local": "0",
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  "net.ipv4.conf.all.force_igmp_version": "0",
  "net.ipv4.conf.all.forwarding": "1",
  "net.ipv4.conf.all.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.all.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.all.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.all.log_martians": "0",
  "net.ipv4.conf.all.mc_forwarding": "0",
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  "net.ipv4.conf.all.proxy_arp": "0",
  "net.ipv4.conf.all.proxy_arp_pvlan": "0",
  "net.ipv4.conf.all.route_localnet": "0",
  "net.ipv4.conf.all.rp_filter": "2",
  "net.ipv4.conf.all.secure_redirects": "1",
  "net.ipv4.conf.all.send_redirects": "1",
  "net.ipv4.conf.all.shared_media": "1",
  "net.ipv4.conf.all.src_valid_mark": "0",
  "net.ipv4.conf.all.tag": "0",
  "net.ipv4.conf.default.accept_local": "0",
  "net.ipv4.conf.default.accept_redirects": "1",
  "net.ipv4.conf.default.accept_source_route": "1",
  "net.ipv4.conf.default.arp_accept": "0",
  "net.ipv4.conf.default.arp_announce": "0",
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  "net.ipv4.conf.default.bc_forwarding": "0",
  "net.ipv4.conf.default.bootp_relay": "0",
  "net.ipv4.conf.default.disable_policy": "0",
  "net.ipv4.conf.default.disable_xfrm": "0",
  "net.ipv4.conf.default.drop_gratuitous_arp": "0",
  "net.ipv4.conf.default.drop_unicast_in_l2_multicast": "0",
  "net.ipv4.conf.default.force_igmp_version": "0",
  "net.ipv4.conf.default.forwarding": "1",
  "net.ipv4.conf.default.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.default.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.default.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.default.log_martians": "0",
  "net.ipv4.conf.default.mc_forwarding": "0",
  "net.ipv4.conf.default.medium_id": "0",
  "net.ipv4.conf.default.promote_secondaries": "1",
  "net.ipv4.conf.default.proxy_arp": "0",
  "net.ipv4.conf.default.proxy_arp_pvlan": "0",
  "net.ipv4.conf.default.route_localnet": "0",
  "net.ipv4.conf.default.rp_filter": "2",
  "net.ipv4.conf.default.secure_redirects": "1",
  "net.ipv4.conf.default.send_redirects": "1",
  "net.ipv4.conf.default.shared_media": "1",
  "net.ipv4.conf.default.src_valid_mark": "0",
  "net.ipv4.conf.default.tag": "0",
  "net.ipv4.conf.docker0.accept_local": "0",
  "net.ipv4.conf.docker0.accept_redirects": "1",
  "net.ipv4.conf.docker0.accept_source_route": "1",
  "net.ipv4.conf.docker0.arp_accept": "0",
  "net.ipv4.conf.docker0.arp_announce": "0",
  "net.ipv4.conf.docker0.arp_filter": "0",
  "net.ipv4.conf.docker0.arp_ignore": "0",
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  "net.ipv4.conf.docker0.force_igmp_version": "0",
  "net.ipv4.conf.docker0.forwarding": "1",
  "net.ipv4.conf.docker0.igmpv2_unsolicited_report_interval": "10000",
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  "net.ipv4.conf.docker0.ignore_routes_with_linkdown": "0",
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  "net.ipv4.conf.docker0.proxy_arp": "0",
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  "net.ipv4.conf.docker0.route_localnet": "0",
  "net.ipv4.conf.docker0.rp_filter": "2",
  "net.ipv4.conf.docker0.secure_redirects": "1",
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  "net.ipv4.conf.docker0.src_valid_mark": "0",
  "net.ipv4.conf.docker0.tag": "0",
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  "net.ipv4.conf.eth0.accept_redirects": "1",
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  "net.ipv4.conf.eth0.force_igmp_version": "0",
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  "net.ipv4.conf.eth0.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.eth0.log_martians": "0",
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  "net.ipv4.conf.eth0.route_localnet": "0",
  "net.ipv4.conf.eth0.rp_filter": "2",
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  "net.ipv4.conf.eth0.src_valid_mark": "0",
  "net.ipv4.conf.eth0.tag": "0",
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  "net.ipv4.conf.lo.accept_redirects": "1",
  "net.ipv4.conf.lo.accept_source_route": "1",
  "net.ipv4.conf.lo.arp_accept": "0",
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  "net.ipv4.conf.lo.drop_gratuitous_arp": "0",
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  "net.ipv4.conf.lo.force_igmp_version": "0",
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  "net.ipv4.conf.lo.igmpv2_unsolicited_report_interval": "10000",
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  "net.ipv4.conf.lo.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.lo.log_martians": "0",
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  "net.ipv4.conf.lo.route_localnet": "0",
  "net.ipv4.conf.lo.rp_filter": "0",
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  "net.ipv4.conf.lo.src_valid_mark": "0",
  "net.ipv4.conf.lo.tag": "0",
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  "net.ipv4.conf.tun0.src_valid_mark": "0",
  "net.ipv4.conf.tun0.tag": "0",
  "net.ipv4.conf.vboxnet0.accept_local": "0",
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  "net.ipv4.conf.vboxnet0.log_martians": "0",
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  "net.ipv4.conf.vboxnet1.accept_local": "0",
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  "net.ipv4.tcp_low_latency": "0",
  "net.ipv4.tcp_max_orphans": "131072",
  "net.ipv4.tcp_max_reordering": "300",
  "net.ipv4.tcp_max_syn_backlog": "2048",
  "net.ipv4.tcp_max_tw_buckets": "131072",
  "net.ipv4.tcp_mem": "381744\t508994\t763488",
  "net.ipv4.tcp_min_rtt_wlen": "300",
  "net.ipv4.tcp_min_snd_mss": "48",
  "net.ipv4.tcp_min_tso_segs": "2",
  "net.ipv4.tcp_moderate_rcvbuf": "1",
  "net.ipv4.tcp_mtu_probe_floor": "48",
  "net.ipv4.tcp_mtu_probing": "0",
  "net.ipv4.tcp_no_metrics_save": "0",
  "net.ipv4.tcp_notsent_lowat": "4294967295",
  "net.ipv4.tcp_orphan_retries": "0",
  "net.ipv4.tcp_pacing_ca_ratio": "120",
  "net.ipv4.tcp_pacing_ss_ratio": "200",
  "net.ipv4.tcp_probe_interval": "600",
  "net.ipv4.tcp_probe_threshold": "8",
  "net.ipv4.tcp_recovery": "1",
  "net.ipv4.tcp_reordering": "3",
  "net.ipv4.tcp_retrans_collapse": "1",
  "net.ipv4.tcp_retries1": "3",
  "net.ipv4.tcp_retries2": "15",
  "net.ipv4.tcp_rfc1337": "0",
  "net.ipv4.tcp_rmem": "4096\t131072\t6291456",
  "net.ipv4.tcp_rx_skb_cache": "0",
  "net.ipv4.tcp_sack": "1",
  "net.ipv4.tcp_slow_start_after_idle": "1",
  "net.ipv4.tcp_stdurg": "0",
  "net.ipv4.tcp_syn_retries": "6",
  "net.ipv4.tcp_synack_retries": "5",
  "net.ipv4.tcp_syncookies": "1",
  "net.ipv4.tcp_thin_linear_timeouts": "0",
  "net.ipv4.tcp_timestamps": "1",
  "net.ipv4.tcp_tso_win_divisor": "3",
  "net.ipv4.tcp_tw_reuse": "2",
  "net.ipv4.tcp_tx_skb_cache": "0",
  "net.ipv4.tcp_window_scaling": "1",
  "net.ipv4.tcp_wmem": "4096\t16384\t4194304",
  "net.ipv4.tcp_workaround_signed_windows": "0",
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  "net.ipv4.udp_mem": "763491\t1017988\t1526982",
  "net.ipv4.udp_rmem_min": "4096",
  "net.ipv4.udp_wmem_min": "4096",
  "net.ipv4.xfrm4_gc_thresh": "32768",
  "net.ipv6.anycast_src_echo_reply": "0",
  "net.ipv6.auto_flowlabels": "1",
  "net.ipv6.bindv6only": "0",
  "net.ipv6.calipso_cache_bucket_size": "10",
  "net.ipv6.calipso_cache_enable": "1",
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  "net.ipv6.conf.all.accept_source_route": "0",
  "net.ipv6.conf.all.addr_gen_mode": "0",
  "net.ipv6.conf.all.autoconf": "1",
  "net.ipv6.conf.all.dad_transmits": "1",
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  "net.ipv6.conf.all.max_desync_factor": "600",
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  "net.ipv6.conf.all.mtu": "1280",
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  "net.ipv6.conf.all.ndisc_tclass": "0",
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  "net.ipv6.conf.all.regen_max_retry": "3",
  "net.ipv6.conf.all.router_probe_interval": "60",
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  "net.ipv6.conf.all.router_solicitation_interval": "4",
  "net.ipv6.conf.all.router_solicitation_max_interval": "3600",
  "net.ipv6.conf.all.router_solicitations": "-1",
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  "net.ipv6.conf.all.temp_valid_lft": "604800",
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  "net.ipv6.conf.default.mtu": "1280",
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  "net.ipv6.conf.default.router_probe_interval": "60",
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  "net.ipv6.conf.default.router_solicitation_interval": "4",
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  "net.ipv6.conf.docker0.mtu": "1500",
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  "net.ipv6.conf.eth0.keep_addr_on_down": "0",
  "net.ipv6.conf.eth0.max_addresses": "16",
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  "net.ipv6.conf.eth0.mtu": "1500",
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  "net.ipv6.conf.eth0.router_probe_interval": "60",
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  "net.ipv6.conf.eth0.router_solicitation_interval": "4",
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  "net.ipv6.conf.lo.accept_dad": "-1",
  "net.ipv6.conf.lo.accept_ra": "1",
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  "net.ipv6.conf.lo.accept_ra_rtr_pref": "1",
  "net.ipv6.conf.lo.accept_redirects": "1",
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  "net.ipv6.conf.lo.autoconf": "1",
  "net.ipv6.conf.lo.dad_transmits": "1",
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  "net.ipv6.conf.lo.drop_unsolicited_na": "0",
  "net.ipv6.conf.lo.enhanced_dad": "1",
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  "net.ipv6.conf.lo.force_tllao": "0",
  "net.ipv6.conf.lo.forwarding": "0",
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  "net.ipv6.conf.lo.keep_addr_on_down": "0",
  "net.ipv6.conf.lo.max_addresses": "16",
  "net.ipv6.conf.lo.max_desync_factor": "600",
  "net.ipv6.conf.lo.mc_forwarding": "0",
  "net.ipv6.conf.lo.mldv1_unsolicited_report_interval": "10000",
  "net.ipv6.conf.lo.mldv2_unsolicited_report_interval": "1000",
  "net.ipv6.conf.lo.mtu": "65536",
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  "net.ipv6.conf.lo.regen_max_retry": "3",
  "net.ipv6.conf.lo.router_probe_interval": "60",
  "net.ipv6.conf.lo.router_solicitation_delay": "1",
  "net.ipv6.conf.lo.router_solicitation_interval": "4",
  "net.ipv6.conf.lo.router_solicitation_max_interval": "3600",
  "net.ipv6.conf.lo.router_solicitations": "-1",
  "net.ipv6.conf.lo.seg6_enabled": "0",
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  "net.ipv6.conf.lo.temp_valid_lft": "604800",
  "net.ipv6.conf.lo.use_oif_addrs_only": "0",
  "net.ipv6.conf.lo.use_tempaddr": "-1",
  "net.ipv6.conf.tun0.accept_dad": "-1",
  "net.ipv6.conf.tun0.accept_ra": "1",
  "net.ipv6.conf.tun0.accept_ra_defrtr": "1",
  "net.ipv6.conf.tun0.accept_ra_from_local": "0",
  "net.ipv6.conf.tun0.accept_ra_min_hop_limit": "1",
  "net.ipv6.conf.tun0.accept_ra_mtu": "1",
  "net.ipv6.conf.tun0.accept_ra_pinfo": "1",
  "net.ipv6.conf.tun0.accept_ra_rt_info_max_plen": "0",
  "net.ipv6.conf.tun0.accept_ra_rt_info_min_plen": "0",
  "net.ipv6.conf.tun0.accept_ra_rtr_pref": "1",
  "net.ipv6.conf.tun0.accept_redirects": "1",
  "net.ipv6.conf.tun0.accept_source_route": "0",
  "net.ipv6.conf.tun0.addr_gen_mode": "3",
  "net.ipv6.conf.tun0.autoconf": "1",
  "net.ipv6.conf.tun0.dad_transmits": "1",
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  "net.ipv6.conf.tun0.drop_unsolicited_na": "0",
  "net.ipv6.conf.tun0.enhanced_dad": "1",
  "net.ipv6.conf.tun0.force_mld_version": "0",
  "net.ipv6.conf.tun0.force_tllao": "0",
  "net.ipv6.conf.tun0.forwarding": "0",
  "net.ipv6.conf.tun0.hop_limit": "64",
  "net.ipv6.conf.tun0.ignore_routes_with_linkdown": "0",
  "net.ipv6.conf.tun0.keep_addr_on_down": "0",
  "net.ipv6.conf.tun0.max_addresses": "16",
  "net.ipv6.conf.tun0.max_desync_factor": "600",
  "net.ipv6.conf.tun0.mc_forwarding": "0",
  "net.ipv6.conf.tun0.mldv1_unsolicited_report_interval": "10000",
  "net.ipv6.conf.tun0.mldv2_unsolicited_report_interval": "1000",
  "net.ipv6.conf.tun0.mtu": "1500",
  "net.ipv6.conf.tun0.ndisc_notify": "0",
  "net.ipv6.conf.tun0.ndisc_tclass": "0",
  "net.ipv6.conf.tun0.proxy_ndp": "0",
  "net.ipv6.conf.tun0.regen_max_retry": "3",
  "net.ipv6.conf.tun0.router_probe_interval": "60",
  "net.ipv6.conf.tun0.router_solicitation_delay": "1",
  "net.ipv6.conf.tun0.router_solicitation_interval": "4",
  "net.ipv6.conf.tun0.router_solicitation_max_interval": "3600",
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  "net.ipv6.route.gc_timeout": "60",
  "net.ipv6.route.max_size": "4096",
  "net.ipv6.route.min_adv_mss": "1220",
  "net.ipv6.route.mtu_expires": "600",
  "net.ipv6.route.skip_notify_on_dev_down": "0",
  "net.ipv6.seg6_flowlabel": "0",
  "net.ipv6.xfrm6_gc_thresh": "32768",
  "net.netfilter.nf_conntrack_acct": "0",
  "net.netfilter.nf_conntrack_buckets": "65536",
  "net.netfilter.nf_conntrack_checksum": "1",
  "net.netfilter.nf_conntrack_count": "224",
  "net.netfilter.nf_conntrack_dccp_loose": "1",
  "net.netfilter.nf_conntrack_dccp_timeout_closereq": "64",
  "net.netfilter.nf_conntrack_dccp_timeout_closing": "64",
  "net.netfilter.nf_conntrack_dccp_timeout_open": "43200",
  "net.netfilter.nf_conntrack_dccp_timeout_partopen": "480",
  "net.netfilter.nf_conntrack_dccp_timeout_request": "240",
  "net.netfilter.nf_conntrack_dccp_timeout_respond": "480",
  "net.netfilter.nf_conntrack_dccp_timeout_timewait": "240",
  "net.netfilter.nf_conntrack_events": "1",
  "net.netfilter.nf_conntrack_expect_max": "1024",
  "net.netfilter.nf_conntrack_frag6_high_thresh": "4194304",
  "net.netfilter.nf_conntrack_frag6_low_thresh": "3145728",
  "net.netfilter.nf_conntrack_frag6_timeout": "60",
  "net.netfilter.nf_conntrack_generic_timeout": "600",
  "net.netfilter.nf_conntrack_gre_timeout": "30",
  "net.netfilter.nf_conntrack_gre_timeout_stream": "180",
  "net.netfilter.nf_conntrack_helper": "0",
  "net.netfilter.nf_conntrack_icmp_timeout": "30",
  "net.netfilter.nf_conntrack_icmpv6_timeout": "30",
  "net.netfilter.nf_conntrack_log_invalid": "0",
  "net.netfilter.nf_conntrack_max": "262144",
  "net.netfilter.nf_conntrack_sctp_timeout_closed": "10",
  "net.netfilter.nf_conntrack_sctp_timeout_cookie_echoed": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_cookie_wait": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_established": "432000",
  "net.netfilter.nf_conntrack_sctp_timeout_heartbeat_acked": "210",
  "net.netfilter.nf_conntrack_sctp_timeout_heartbeat_sent": "30",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_ack_sent": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_recd": "0",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_sent": "0",
  "net.netfilter.nf_conntrack_tcp_be_liberal": "0",
  "net.netfilter.nf_conntrack_tcp_loose": "1",
  "net.netfilter.nf_conntrack_tcp_max_retrans": "3",
  "net.netfilter.nf_conntrack_tcp_timeout_close": "10",
  "net.netfilter.nf_conntrack_tcp_timeout_close_wait": "60",
  "net.netfilter.nf_conntrack_tcp_timeout_established": "432000",
  "net.netfilter.nf_conntrack_tcp_timeout_fin_wait": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_last_ack": "30",
  "net.netfilter.nf_conntrack_tcp_timeout_max_retrans": "300",
  "net.netfilter.nf_conntrack_tcp_timeout_syn_recv": "60",
  "net.netfilter.nf_conntrack_tcp_timeout_syn_sent": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_time_wait": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_unacknowledged": "300",
  "net.netfilter.nf_conntrack_timestamp": "0",
  "net.netfilter.nf_conntrack_udp_timeout": "30",
  "net.netfilter.nf_conntrack_udp_timeout_stream": "120",
  "net.netfilter.nf_log.0": "NONE",
  "net.netfilter.nf_log.1": "NONE",
  "net.netfilter.nf_log.10": "NONE",
  "net.netfilter.nf_log.11": "NONE",
  "net.netfilter.nf_log.12": "NONE",
  "net.netfilter.nf_log.2": "NONE",
  "net.netfilter.nf_log.3": "NONE",
  "net.netfilter.nf_log.4": "NONE",
  "net.netfilter.nf_log.5": "NONE",
  "net.netfilter.nf_log.6": "NONE",
  "net.netfilter.nf_log.7": "NONE",
  "net.netfilter.nf_log.8": "NONE",
  "net.netfilter.nf_log.9": "NONE",
  "net.netfilter.nf_log_all_netns": "0",
  "net.nf_conntrack_max": "262144",
  "net.unix.max_dgram_qlen": "512",
  "sunrpc.max_resvport": "1023",
  "sunrpc.min_resvport": "665",
  "sunrpc.nfs_debug": "0x0000",
  "sunrpc.nfsd_debug": "0x0000",
  "sunrpc.nlm_debug": "0x0000",
  "sunrpc.rpc_debug": "0x0000",
  "sunrpc.tcp_fin_timeout": "15",
  "sunrpc.tcp_max_slot_table_entries": "65536",
  "sunrpc.tcp_slot_table_entries": "2",
  "sunrpc.transports": "tcp 1048576\nudp 32768",
  "sunrpc.udp_slot_table_entries": "16",
  "user.max_cgroup_namespaces": "127767",
  "user.max_inotify_instances": "128",
  "user.max_inotify_watches": "98304",
  "user.max_ipc_namespaces": "127767",
  "user.max_mnt_namespaces": "127767",
  "user.max_net_namespaces": "127767",
  "user.max_pid_namespaces": "127767",
  "user.max_user_namespaces": "127767",
  "user.max_uts_namespaces": "127767",
  "vm.admin_reserve_kbytes": "8192",
  "vm.block_dump": "0",
  "vm.compact_unevictable_allowed": "1",
  "vm.dirty_background_bytes": "0",
  "vm.dirty_background_ratio": "10",
  "vm.dirty_bytes": "0",
  "vm.dirty_expire_centisecs": "1500",
  "vm.dirty_ratio": "20",
  "vm.dirty_writeback_centisecs": "1500",
  "vm.dirtytime_expire_seconds": "43200",
  "vm.extfrag_threshold": "500",
  "vm.hugetlb_shm_group": "0",
  "vm.laptop_mode": "0",
  "vm.legacy_va_layout": "0",
  "vm.lowmem_reserve_ratio": "256\t256\t32\t0\t0",
  "vm.max_map_count": "65530",
  "vm.memory_failure_early_kill": "0",
  "vm.memory_failure_recovery": "1",
  "vm.min_free_kbytes": "67584",
  "vm.min_slab_ratio": "5",
  "vm.min_unmapped_ratio": "1",
  "vm.mmap_min_addr": "65536",
  "vm.nr_hugepages": "0",
  "vm.nr_hugepages_mempolicy": "0",
  "vm.nr_overcommit_hugepages": "0",
  "vm.numa_stat": "1",
  "vm.numa_zonelist_order": "Node",
  "vm.oom_dump_tasks": "1",
  "vm.oom_kill_allocating_task": "0",
  "vm.overcommit_kbytes": "0",
  "vm.overcommit_memory": "0",
  "vm.overcommit_ratio": "50",
  "vm.page-cluster": "3",
  "vm.panic_on_oom": "0",
  "vm.percpu_pagelist_fraction": "0",
  "vm.stat_interval": "1",
  "vm.swappiness": "60",
  "vm.unprivileged_userfaultfd": "1",
  "vm.user_reserve_kbytes": "131072",
  "vm.vfs_cache_pressure": "100",
  "vm.watermark_boost_factor": "0",
  "vm.watermark_scale_factor": "10",
  "vm.zone_reclaim_mode": "0"
}
</pre>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/sysctlvalue.cf</label>
<pre><code class="cfengine3" >bundle agent example_sysctlvalue
{
  vars:
      "kernel_keys_gc_delay"
        string =&gt; sysctlvalue("kernel.keys.gc_delay");

  reports:
      "kernel.keys.gc_delay: $(kernel_keys_gc_delay)";
}
bundle agent __main__
{
  methods: "example_sysctlvalue";
}
</code></pre>
</div>

<pre class="example">
R: kernel.keys.gc_delay: 300
</pre>


<div class="org-src-container">
<label class="org-src-name">examples/readenvfile.cf</label>
<pre><code class="cfengine3" >bundle agent example_readenvfile
{
  vars:
      "_d" data =&gt; readenvfile("/etc/os-release");

  reports:
      "$(with)" with =&gt; string_mustache( "{{%-top-}}", _d );
}
bundle agent __main__
{
  methods: "example_readenvfile";
}
</code></pre>
</div>

<pre class="example" id="org9df88e3">
R: {
  "BUG_REPORT_URL": "https://bugs.launchpad.net/ubuntu/",
  "HOME_URL": "https://www.ubuntu.com/",
  "ID": "ubuntu",
  "ID_LIKE": "debian",
  "NAME": "Ubuntu",
  "PRETTY_NAME": "Ubuntu 20.04.1 LTS",
  "PRIVACY_POLICY_URL": "https://www.ubuntu.com/legal/terms-and-policies/privacy-policy",
  "SUPPORT_URL": "https://help.ubuntu.com/",
  "UBUNTU_CODENAME": "focal",
  "VERSION": "20.04.1 LTS (Focal Fossa)",
  "VERSION_CODENAME": "focal",
  "VERSION_ID": "20.04"
}
</pre>

</section>
<section id="slide-orgbb41758">
<h3 id="orgbb41758">In 3.10</h3>
<div class="outline-text-3" id="text-orgbb41758">
</div>
</section>
<section id="slide-org7be8450">
<h4 id="org7be8450">Functions</h4>
<ul>
<li><code>getuserinfo()</code></li>
<li><code>isipinsubnet()</code></li>
<li><code>variablesmatching_as_data()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/getuserinfo.cf</label>
<pre><code class="cfengine3" >bundle agent example_getuserinfo
{
  vars:
      "_user_info" data =&gt; getuserinfo("root");
      "_user_info_str" string =&gt; format( "%S", _user_info);
  reports:
      "$(_user_info_str)";
}
bundle agent __main__
{
  methods: "example_getuserinfo";
}
</code></pre>
</div>

<pre class="example">
R: {"description":"root","gid":0,"home_dir":"/root","shell":"/bin/bash","uid":0,"username":"root"}
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/isipinsubnet.cf</label>
<pre><code class="cfengine3" >bundle agent example_isipinsubnet
{
  classes:
      "192_168_0_1_in_192_168_0_0_24"
        expression =&gt; isipinsubnet( "192.168.0.0/24", "192.168.0.1" );
      "192_168_99_1_in_192_168_0_0_24"
        expression =&gt; isipinsubnet( "192.168.0.0/24", "192.168.99.1" );

  reports:
    192_168_0_1_in_192_168_0_0_24::
      "192.168.0.1 is in 192.168.0.0/24";
    !192_168_99_1_in_192_168_0_0_24::
      "192.168.99.1 not in 192.168.0.0/24";
}
bundle agent __main__
{
  methods: "example_isipinsubnet";
}
</code></pre>
</div>

<pre class="example">
R: 192.168.0.1 is in 192.168.0.0/24
R: 192.168.99.1 not in 192.168.0.0/24
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/variablesmatching_as_data.cf</label>
<pre><code class="cfengine3" >bundle agent example_variablesmatching_as_data
{
  vars:
     "ports" data =&gt; variablesmatching_as_data(".*", "port" );
     "ports_str" string =&gt; format( "%S", ports );
  reports:
    "$(ports_str)";
}
bundle agent one
{
  vars:
    "the_port" string =&gt; "443", meta =&gt; { "port" };
}
bundle agent two
{
  vars:
    "my_port" string =&gt; "80", meta =&gt; { "port" };
}
bundle agent __main__
{
  methods: "example_variablesmatching_as_data";
}
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: {"default:one.the_port":"443","default:two.my_port":"80"}
</pre>

</section>
<section id="slide-org06e35be">
<h3 id="org06e35be">In 3.9</h3>
<div class="outline-text-3" id="text-org06e35be">
</div>
</section>
<section id="slide-org99e544f">
<h4 id="org99e544f">Functions</h4>
<ul>
<li><code>callstack_callers()</code></li>
<li><code>callstack_promisers()</code></li>
<li><code>network_connections()</code></li>
<li><code>findprocesses()</code></li>
<li><code>processexists()</code></li>
<li><code>regex_replace()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/regex_replace.cf</label>
<pre><code class="cfengine3" >bundle agent example_regex_replace
{
  vars:
      "my_string"
        string =&gt; "Perl is the best config management tool";
  reports:
      "$(with)" with =&gt; regex_replace( $(my_string),
                                        "^\w+", "CFEngine", "" );
}
bundle agent __main__
{
  methods: "example_regex_replace";
}
</code></pre>
</div>

<pre class="example">
R: CFEngine is the best config management tool
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/processexists.cf</label>
<pre><code class="cfengine3" >bundle agent example_processexists
{
  reports:
      "Emacs is running" if =&gt; processexists( ".*emacs.*");
      "Emacs is NOT running" unless =&gt; processexists( ".*emacs.*");
}
bundle agent __main__
{
  methods: "example_processexists";
}
</code></pre>
</div>

<pre class="example">
R: Emacs is running
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/findprocesses.cf</label>
<pre><code class="cfengine3" >bundle agent example_findprocesses
{
  vars:
    "_emacs_procs" data =&gt; findprocesses( ".*emacs.*" );
    "_i" slist =&gt; getindices( _emacs_procs );
  reports:
      "Emacs process: $(_emacs_procs[$(_i)][line])";
}
bundle agent __main__
{
  methods: "example_findprocesses";
}
</code></pre>
</div>

<pre class="example">
R: Emacs process: nickanderson                   1064467 1064418 1064467  0.0  0.0   5116   0      2644 ?           1 11:45    03:15:18 00:00:00 /home/nickanderson/.emacs.d/elpa/26.3/develop/emacsql-sqlite-20190727.1710/sqlite/emacsql-sqlite /home/nickanderson/.emacs.d/.cache/forge-database.sqlite
R: Emacs process: nickanderson                   1064418    4439    4438 14.3  1.7 987916   0    578144 ?           4 11:45    03:15:45 00:28:10 /usr/bin/emacs26
R: Emacs process: nickanderson                      4593    4355    4355  0.2  1.0 1161376  0    348116 ?           8 Aug10  7-06:34:46 00:22:36 /usr/bin/emacs26 --smid=102752662b823d000159482098500000042660032 --no-splash --chdir=/home/nickanderson
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/callstack_promisers.cf</label>
<pre><code class="cfengine3" >bundle agent example_callstack_promisers
{
  methods:
    "Second promiser"
      usebundle =&gt; my_bundle;
}
bundle agent my_bundle
{
  vars:
    "Callers"
      slist =&gt; callstack_promisers();

  reports:
    "$(Callers)";
}
bundle agent __main__
{
  methods:
    "First promiser"
      usebundle =&gt; example_callstack_promisers;
}
</code></pre>
</div>

<pre class="example">
R: First promiser
R: Second promiser
</pre>


</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/network_connections.cf</label>
<pre><code class="cfengine3" >bundle agent example_network_connections
{
  vars:
    "_network_connections"
      data =&gt; network_connections();
    "_network_connections_str"
      string =&gt; format( "%S", _network_connections );
  reports:
    "$(_network_connections[tcp][0][local][address]):$(_network_connections[tcp][0][local][port]) is connected to $(_network_connections[tcp][0][remote][address]):$(_network_connections[tcp][0][remote][port])";
}

bundle agent __main__
{
  methods: "example_network_connections";
}
</code></pre>
</div>

<pre class="example">
R: 127.0.0.1:17600 is connected to 0.0.0.0:0
</pre>

</section>
<section id="slide-org45858bf">
<h3 id="org45858bf">In 3.8</h3>
<div class="outline-text-3" id="text-org45858bf">
</div>
</section>
<section id="slide-orga38e1f0">
<h4 id="orga38e1f0">Functions</h4>
<ul>
<li><code>url_get()</code></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">examples/url_get.cf</label>
<pre><code class="cfengine3" >bundle agent example_url_get
{
  vars:
      "_response"
        data =&gt; url_get( "https://jsonplaceholder.typicode.com/todos/1",
                         '{}' );
      # Convert content string to data container
      "_content" data =&gt; "$(_response[content])";

      # JSON representation of data container
      "_str_content" string =&gt; format( "%S", _content );

  reports:
      "$(_str_content)";
}
bundle agent __main__
{
  methods: "example_url_get";
}
</code></pre>
</div>

<pre class="example">
R: {"completed":false,"id":1,"title":"delectus aut autem","userId":1}
</pre>

</section>
</section>
<section>
<section id="slide-org361105e">
<h2 id="org361105e">Special Topics</h2>
<div class="outline-text-2" id="text-org361105e">
</div>
</section>
<section id="slide-org0682671">
<h3 id="org0682671">Internal agent upgrade mechanism</h3>
<ul>
<li>Place agent packages in
<code>/var/cfengine/master_software_updates/$(sys.flavour)_$(sys.arch)</code></li>
<li><p>
Define <code>trigger_upgrade</code> for set of hosts. Ref <code>update_def.cf</code>
</p>
<div class="org-src-container">

<pre><code class="cfengine3" >classes:
  "trigger_upgrade" or =&gt; { "host1", "host2", "redhat_5" };
</code></pre>
</div></li>

</ul>

<aside class="notes">
<p>
The MPF comes with policy that allows for clients to upgrade their own
packages that are served from the hub.
</p>

</aside>
</section>
<section id="slide-orga09901a">
<h3 id="orga09901a">Data transformations</h3>
<div class="outline-text-3" id="text-orga09901a">
</div>
</section>
<section id="slide-orgac06eff">
<h4 id="orgac06eff">Re-parent a data structure</h4>
<p>
With <code>mergedata()</code> it is possible to wrap data containers inside of a new JSON
data structure in the current namespace.
</p>

<p>
For example, here we take an array of objects describing content for pghba.conf
file and re-parent it under the pghba key in a new data-structure.
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{
    vars:
      "pghba_directives" data =&gt; '[
  {
    "type": "host",
    "database": "replication",
    "user": "all",
    "address": "secondary-replication",
    "method": "trust"
  }
]';

      "data" data =&gt; mergedata( '{ "pghba": pghba_directives }');


  reports:
      "$(with)" with =&gt; string_mustache( "{{%-top-}}", data);

}
</code></pre>
</div>

<pre class="example" id="orgd6d9bc1">
R: {
  "pghba": [
    {
      "address": "secondary-replication",
      "database": "replication",
      "method": "trust",
      "type": "host",
      "user": "all"
    }
  ]
}
</pre>

</section>
<section id="slide-org701f90b">
<h4 id="org701f90b">Merging a result from <code>variablesmatching_as_data()</code></h4>
<p>
I see. So, we need to merge the variable values together.
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{
  vars:
      "va_active_opsview_scripts_new"
        data =&gt; variablesmatching_as_data(".*", "opsview_rules_scripts");

      "va_active_opsview_scripts_new_index"
        slist =&gt; sort( getindices(va_active_opsview_scripts_new), lex);

      # Make a new data container to hold the picked and merged content
      "merged" data =&gt; '[]';
      # Merge the existing merged data container with each one of the indices
      "merged" data =&gt; mergedata( merged, "va_active_opsview_scripts_new[$(va_active_opsview_scripts_new_index)]" );


  reports:
      "merged: $(with)"
        with =&gt; string_mustache( "{{%-top-}}", merged );
      "Rendered to desired format$(const.n)$(with)"
        with =&gt; string_mustache( "{{#-top-}}{{name}}={{rule}}$(const.n){{/-top-}}", merged);
}


bundle agent app_opsview_agent
{
  vars:
      "va_opsview_rules_scripts_array_app_opsview_agent_windows"
        meta =&gt; { "opsview_rules_scripts" },
        data =&gt; '[
    {
      "name": "check_ntp_time",
      "rule": "scripts\\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$",
      "type": "scripts"
    },
    {
      "name": "check_disk",
      "rule": "scripts\\diskspace_nrpe_nt.exe $ARG1$",
      "type": "scripts"
    },
    {
      "name": "check_shadowcopy_status",
      "rule": "cmd /c echo scripts\\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -",
      "type": "scripts"
    }
  ]';

      "va_opsview_rules_scripts_array_app_vars_windows"
        meta =&gt; { "opsview_rules_scripts" },
        data =&gt; '[
    {
      "name": "check_cory_test",
      "rule": "scripts\\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$",
      "type": "scripts"
    },
    {
      "name": "check_theo_test",
      "rule": "scripts\\check_theo.exe $ARG1$",
      "type": "scripts"
    }
  ]';
}
</code></pre>
</div>

<pre class="example" id="org0d240d4">
R: merged: [
  {
    "name": "check_ntp_time",
    "rule": "scripts\\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$",
    "type": "scripts"
  },
  {
    "name": "check_disk",
    "rule": "scripts\\diskspace_nrpe_nt.exe $ARG1$",
    "type": "scripts"
  },
  {
    "name": "check_shadowcopy_status",
    "rule": "cmd /c echo scripts\\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -",
    "type": "scripts"
  },
  {
    "name": "check_cory_test",
    "rule": "scripts\\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$",
    "type": "scripts"
  },
  {
    "name": "check_theo_test",
    "rule": "scripts\\check_theo.exe $ARG1$",
    "type": "scripts"
  }
]
R: Rendered to desired format
check_ntp_time=scripts\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$
check_disk=scripts\diskspace_nrpe_nt.exe $ARG1$
check_shadowcopy_status=cmd /c echo scripts\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -
check_cory_test=scripts\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$
check_theo_test=scripts\check_theo.exe $ARG1$

</pre>
</section>
<section id="slide-orgf8afce4">
<h3 id="orgf8afce4">Inheriting calling bundles classes</h3>
<div class="org-src-container">
<label class="org-src-name">examples/usebundle_inherit_context.cf</label>
<pre id="examples/usebundle_inherit_context.cf"><code class="cfengine3" >bundle agent parent
{
  classes:
      "parent_1" scope =&gt; "bundle";

  methods:
      "Inherit context"
        usebundle =&gt; child( "First"),
        inherit =&gt; "true";

      "No context inheritance"
        usebundle =&gt; child( "Second");
}
bundle agent child( id_string )
{
  reports:
    parent_1::
      "$(id_string) see class parent_1 defined";
    !parent_1::
      "$(id_string) see class parent_1 NOT defined";
}
bundle agent __main__ { methods: "parent"; }
</code></pre>
</div>

</section>
<section>

<pre class="example">
R: First see class parent_1 defined
R: Second see class parent_1 NOT defined
</pre>
</section>
<section id="slide-orgebf51c2">
<h3 id="orgebf51c2">Bundles can return data</h3>
<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent parent
{

  methods:
     "Get data returned by bundle"
        usebundle =&gt; my_bundle,
        useresult =&gt; "my_returned_vars";


}
bundle agent my_bundle
{
  reports:
      "Hello world" bundle_return_value_index =&gt; "msg";
      "Something" bundle_return_value_index =&gt; "1";
}
bundle agent __main__ { methods: "parent"; }
</code></pre>
</div>

<pre class="example">
Variable name                            Variable value                                               Meta tags
default:parent.my_returned_vars[1]       Something                                                    source=bundle
default:parent.my_returned_vars[msg]     Hello world                                                  source=bundle
</pre>
</section>
<section id="slide-org348af81">
<h3 id="org348af81">Tracking files for change (Tripwire/AIDE)</h3>
<p>
multiple ways of achieving this with CFEngine, there are many useful functions, <code>lsdir()</code>, <code>findfiles()</code>, <code>filestat()</code>, <code>file_hash()</code> all come to mind. However, did you know that CFEngine has some native functionality kind of like AIDE or Tripwire?
</p>

<p>
You can use the <i>changes</i> attribute can be used on a files promise to help with this sort of tracking. The changes attribute can record and update file stats and digests. <a href="https://cfengine.com/company/blog-detail/cfengine-3-15-lts-released/#FileIntegrityMonitoring">CFEngine Enterprise can even report back diffs of the specific content changes</a>.
</p>

<div class="org-src-container">
<label class="org-src-name">Example tracking changes to a directory</label>
<pre><code class="cfengine3" >bundle agent example_action_on_dir_change
{
  files:
      "/tmp/$(this.bundle)/"
        changes =&gt; detect_all_change,
        classes =&gt; results( "bundle", "_changes_$(this.promiser)");

  reports:
      "Classes prefixed with _changes:$(const.n)$(with)"
        with =&gt; join( "$(const.t)$(const.n)", classesmatching( "_changes.*"));
}
bundle agent __main__
{
  methods:
      "example_action_on_dir_change";
}
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">Illustration of change tracking with a directory</label>
<pre><code class="sh" >exec 2&gt;&amp;1
echo "Resetting Observations"
rm -rf /tmp/example_action_on_dir_change
rm -rf ~/.cfagent/state/cf_changes.lmdb*
rm -rf ~/.cfagent/state/nova_diff.log
rm -rf ~/.cfagent/state/file_changes.log
cf-agent --version

echo "\nFirst observation of directory"
mkdir -p /tmp/example_action_on_dir_change/subdir0
touch /tmp/example_action_on_dir_change/file0
mkdir -p /tmp/example_action_on_dir_change
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, no changes since last run"
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, change stats on existing file in top level"
touch /tmp/example_action_on_dir_change/file0
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, change content in existing file in top level"
echo "Cha cha cha changes ..." &gt; /tmp/example_action_on_dir_change/file0
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, new file in top level"
touch /tmp/example_action_on_dir_change/file1
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, new file in existing subdir"
touch /tmp/example_action_on_dir_change/subdir0/file2
cf-agent -Kf /tmp/example_action_on_dir_change.cf

echo "\nSubsequent agent run, new subdir in existing subdir"
mkdir -p /tmp/example_action_on_dir_change/subdir1
cf-agent -Kf /tmp/example_action_on_dir_change.cf

:
</code></pre>
</div>

<pre class="example" id="org86414cb">
Resetting Observations
CFEngine Core 3.17.0
CFEngine Enterprise 3.17.0

First observation of directory
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__repaired
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, no changes since last run
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, change stats on existing file in top level
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, change content in existing file in top level
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, new file in top level
  notice: Last modified time for '/tmp/example_action_on_dir_change/' changed 'Tue Mar  9 09:24:21 2021' -&gt; 'Tue Mar  9 09:24:23 2021'
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__repaired
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, new file in existing subdir
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached

Subsequent agent run, new subdir in existing subdir
  notice: Last modified time for '/tmp/example_action_on_dir_change/' changed 'Tue Mar  9 09:24:23 2021' -&gt; 'Tue Mar  9 09:24:24 2021'
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change__repaired
_changes__tmp_example_action_on_dir_change__kept
_changes__tmp_example_action_on_dir_change__reached
</pre>

<p>
As  you can see from the output above, if the directory changes you can get a repaired result on the files promise. You might ask what was repaired when you are just monitoring for changes, &#x2026; the state database. You can choose to not update the state db when differences are noticed (more typical for AIDE or Tripwire) but that is atypical in my experience with CFEngine.
</p>

<p>
You might also notice the example above is only watching the directory itself, it's not doing recursion. Monitoring a tree recursively can get expensive, but it's doable. Here is a modified example illustrating monitoring a directory recursively for changes.
</p>

<div class="org-src-container">
<label class="org-src-name">Example tracking changes to all files in a directory recursively</label>
<pre><code class="cfengine3" >bundle agent example_action_on_dir_change_all_files_recursively
{
  files:
      "/tmp/$(this.bundle)/"
        depth_search =&gt; recurse( inf ),
        file_select =&gt; all,
        changes =&gt; detect_all_change,
        classes =&gt; results( "bundle", "_changes_$(this.promiser)");

  reports:
      "Classes prefixed with _changes:$(const.n)$(with)"
        with =&gt; join( "$(const.t)$(const.n)", classesmatching( "_changes.*"));

}
bundle agent __main__
{
  methods:
      "example_action_on_dir_change_all_files_recursively";
}
</code></pre>
</div>


<div class="org-src-container">
<label class="org-src-name">Illustration of change tracking with a directory recursively</label>
<pre><code class="sh" >exec 2&gt;&amp;1
echo "Resetting Observations"
rm -rf /tmp/example_action_on_dir_change_all_files_recursively
rm -rf ~/.cfagent/state/cf_changes.lmdb*
rm -rf ~/.cfagent/state/nova_diff.log
rm -rf ~/.cfagent/state/file_changes.log
cf-agent --version

echo "\nFirst observation of directory"
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively/subdir0
touch /tmp/example_action_on_dir_change_all_files_recursively/file0
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, no changes since last run"
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, change stats on existing file in top level"
touch /tmp/example_action_on_dir_change_all_files_recursively/file0
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, change content in existing file in top level"
echo "Cha cha cha changes ..." &gt; /tmp/example_action_on_dir_change_all_files_recursively/file0
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, new file in top level"
touch /tmp/example_action_on_dir_change_all_files_recursively/file1
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, new file in existing subdir"
touch /tmp/example_action_on_dir_change_all_files_recursively/subdir0/file2
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

echo "\nSubsequent agent run, new subdir in existing subdir"
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively/subdir1
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively.cf

:
</code></pre>
</div>

<pre class="example" id="org21ed59a">
Resetting Observations
CFEngine Core 3.17.0
CFEngine Enterprise 3.17.0

First observation of directory
  notice: New file '/tmp/example_action_on_dir_change_recursively/file0' found
  notice: New file '/tmp/example_action_on_dir_change_recursively/subdir0' found
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_repaired
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_repaired
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, no changes since last run
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__kept
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, change stats on existing file in top level
  notice: Last modified time for '/tmp/example_action_on_dir_change_recursively/file0' changed 'Tue Mar  9 09:50:10 2021' -&gt; 'Tue Mar  9 09:50:11 2021'
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_repaired
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, change content in existing file in top level
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_repaired
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, new file in top level
  notice: New file '/tmp/example_action_on_dir_change_recursively/file1' found
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_file1_repaired
_changes__tmp_example_action_on_dir_change_recursively_file1_kept
_changes__tmp_example_action_on_dir_change_recursively_file1_reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, new file in existing subdir
  notice: New file '/tmp/example_action_on_dir_change_recursively/subdir0/file2' found
  notice: Last modified time for '/tmp/example_action_on_dir_change_recursively/subdir0' changed 'Tue Mar  9 09:50:10 2021' -&gt; 'Tue Mar  9 09:50:12 2021'
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively_file1_kept
_changes__tmp_example_action_on_dir_change_recursively_file1_reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_repaired
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_file2_repaired
_changes__tmp_example_action_on_dir_change_recursively_subdir0_file2_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_file2_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached

Subsequent agent run, new subdir in existing subdir
  notice: New file '/tmp/example_action_on_dir_change_recursively/subdir1' found
R: Classes prefixed with _changes:
_changes__tmp_example_action_on_dir_change_recursively__repaired
_changes__tmp_example_action_on_dir_change_recursively__reached
_changes__tmp_example_action_on_dir_change_recursively_file1_kept
_changes__tmp_example_action_on_dir_change_recursively_file1_reached
_changes__tmp_example_action_on_dir_change_recursively_subdir1_repaired
_changes__tmp_example_action_on_dir_change_recursively_subdir1_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir1_reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_reached
_changes__tmp_example_action_on_dir_change_recursively_subdir0_file2_kept
_changes__tmp_example_action_on_dir_change_recursively_subdir0_file2_reached
_changes__tmp_example_action_on_dir_change_recursively_file0_kept
_changes__tmp_example_action_on_dir_change_recursively_file0_reached
</pre>

<p>
In the examples above I used <code>$(this.promiser)</code> so that I would get a class for each file. If you don't need the detail, you could use something static.
</p>

<div class="org-src-container">
<label class="org-src-name">Example tracking changes to all files in a directory recursively with fewer classes</label>
<pre><code class="cfengine3" >bundle agent example_action_on_dir_change_all_files_recursively_with_fewer_classes
{
  files:
      "/tmp/$(this.bundle)/"
        depth_search =&gt; recurse( inf ),
        file_select =&gt; all,
        changes =&gt; detect_all_change,
        classes =&gt; results( "bundle", "i_see_changes");

  reports:
      "Classes prefixed with _changes:$(const.n)$(with)"
        with =&gt; join( "$(const.t)$(const.n)", classesmatching( "i_see_changes.*"));

}
bundle agent __main__
{
  methods:
      "example_action_on_dir_change_all_files_recursively_with_fewer_classes";
}
</code></pre>
</div>

<div class="org-src-container">
<label class="org-src-name">Illustration of change tracking with a directory recursively</label>
<pre><code class="sh" >exec 2&gt;&amp;1
echo "Resetting Observations"
rm -rf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes
rm -rf ~/.cfagent/state/cf_changes.lmdb*
rm -rf ~/.cfagent/state/nova_diff.log
rm -rf ~/.cfagent/state/file_changes.log
cf-agent --version

echo "\nFirst observation of directory"
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir0
touch /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file0
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, no changes since last run"
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, change stats on existing file in top level"
touch /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file0
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, change content in existing file in top level"
echo "Cha cha cha changes ..." &gt; /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file0
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, new file in top level"
touch /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file1
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, new file in existing subdir"
touch /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir0/file2
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

echo "\nSubsequent agent run, new subdir in existing subdir"
mkdir -p /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir1
cf-agent -Kf /tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes.cf

:
</code></pre>
</div>

<pre class="example" id="org718c3ec">
Resetting Observations
CFEngine Core 3.17.0
CFEngine Enterprise 3.17.0

First observation of directory
  notice: New file '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file0' found
  notice: New file '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir0' found
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, no changes since last run
R: Classes prefixed with _changes:
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, change stats on existing file in top level
  notice: Last modified time for '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file0' changed 'Tue Mar  9 09:59:04 2021' -&gt; 'Tue Mar  9 09:59:05 2021'
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, change content in existing file in top level
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, new file in top level
  notice: New file '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/file1' found
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, new file in existing subdir
  notice: New file '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir0/file2' found
  notice: Last modified time for '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir0' changed 'Tue Mar  9 09:59:04 2021' -&gt; 'Tue Mar  9 09:59:06 2021'
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached

Subsequent agent run, new subdir in existing subdir
  notice: New file '/tmp/example_action_on_dir_change_all_files_recursively_with_fewer_classes/subdir1' found
R: Classes prefixed with _changes:
i_see_changes_repaired
i_see_changes_kept
i_see_changes_reached
</pre>

</section>
</section>
<section>
<section id="slide-org6d21760">
<h2 id="org6d21760">Tips</h2>
</section>
<section id="slide-org4bd13c2">
<h3 id="org4bd13c2">Use the tools!</h3>
</section>
<section id="slide-org5b2353f">
<h3 id="org5b2353f">Use an editor with syntax highlighting</h3>
</section>
<section id="slide-org771d95e">
<h3 id="org771d95e">Use the docs</h3>
<ul>
<li>Masterfiles Policy Framework (MPF)</li>
<li>Function Reference</li>

</ul>
</section>
<section id="slide-orgcfdd517">
<h3 id="orgcfdd517">Syntax Checking</h3>
<div class="org-src-container">
<label class="org-src-name">Full Syntax Check</label>
<pre><code class="shell" >cf-promises --eval-functions=yes --full-check \
  -f ./examples/00-01-hello_world.cf
</code></pre>
</div>

<ul>
<li>Full check requires <code>body common control</code> (or <code>bundle agent main</code>). Typically this is only used when you run cf-promsies against <code>promises.cf</code>, <code>update.cf</code>, or <code>standalone_self_upgrade.cf</code></li>
<li><b>NOTE: This is context sensitive/aware</b></li>

</ul>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Partial Syntax Check</label>
<pre><code class="shell" >cf-promises -f ./examples/00-01-hello_world.cf
</code></pre>
</div>

<p>
Build into your workflow!
</p>
<ul>
<li>Editors</li>
<li>vcs hooks</li>
<li>build systems</li>

</ul>

<aside class="notes">
<p>
Its typical to wire full policy syntax checks into pre-commit hooks or have
them run by a continuous integration system like Jenkins.
</p>

<p>
Partial checks are useful to run while developing policy, and depending on the
editor, you may be able to do this as a save hook.
</p>

</aside>
</section>
<section id="slide-orge7af35f">
<h3 id="orge7af35f"><code>noshell</code> vs <code>useshell</code> for <code>commands</code> type promises, <code>execresult()</code>, and <code>returnszero()</code></h3>
<aside class="notes">
<p>
As a general rule of thumb I prefer to use <code>noshell</code>. I try to only <code>useshell</code>
if it's required. Running a command with a shell requires more resources.
However using a shell does provide some additional functionality.
</p>

<p>
Additionally as a general rule you should not be making changes to the system
using <code>execresult()</code> or <code>returnszero()</code>. The functions are intended to be used
for discovery. As with most rules, there are times when it would make sense to
run a script that changes the system from one of these functions, but I can't
think of any off the top of my head.
</p>

</aside>

<ul>
<li><code>useshell</code> allows you to use pipelines</li>

</ul>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{

  vars:
      "result_with_shell"
        string =&gt; execresult( "/bin/echo 'Hello$(const.n) World' | grep Hello", useshell);

    reports:
      "$(result_with_shell)";
}
</code></pre>
</div>

<pre class="example">
R: Hello
</pre>


</section>
<section>

<ul>
<li><code>useshell</code> allows you to redirect output</li>

</ul>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{

  classes:

      "successfully_executed"
        expression =&gt; returnszero( "/bin/echo 'Hello$(const.n) World' | grep -i world &gt; $(this.promise_filename).out ", useshell);

    reports:
      successfully_executed::
      "Successfully Executed";
      "Grep found: "
        printfile =&gt; cat( "$(this.promise_filename).out" );
}
</code></pre>
</div>

<pre class="example">
R: Successfully Executed
R: Grep found:
R:  World
</pre>


</section>
<section>

<ul>
<li><code>useshell</code> allows you to use unqualified commands</li>

</ul>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{

    vars:

      # Note that echo is not fully qualified. That's because it picked it up
      # from the shells PATH

      "result"
        string =&gt; execresult( "echo 'Hello World'", useshell);

    reports:
      "Result: $(result)";
}
</code></pre>
</div>

<pre class="example">
R: Result: Hello World
</pre>
</section>
<section id="slide-org88d528a">
<h3 id="org88d528a">Debug Reports</h3>
<p>
Use standardized <code>DEBUG</code> reports for policy development and troubleshooting.
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{
  reports:
    DEBUG|DEBUG_this_bundle_name::
      "DEBUG $(this.bundle): ....";
    "DEBUG|DEBUG_$(this.bundle)"::
      "DEBUG $(this.bundle): ....";
 }
</code></pre>
</div>

</section>
<section id="slide-org3bf481a">
<h3 id="org3bf481a">Promise comments</h3>
<p>
Use promise comments to document <b>WHY</b> the promise is important.
</p>

<div class="org-src-container">

<pre><code class="cfengine3" >bundle agent main
{
  services:
    "firewalld"
      policy =&gt; "start",
      comment =&gt; "If this service isnt running, then we have unnecessary
                  exposure and increase our risk of a security breach.";
}
</code></pre>
</div>

</section>
<section id="slide-org60ea069">
<h3 id="org60ea069"><code>jq</code></h3>
<aside class="notes">
<ul>
<li>sed and awk for JSON</li>

</ul>

</aside>

<div class="org-src-container">

<pre id="json"><code class="sh" >echo '{
  "data": [
    {
      "firstseen": "1578745699",
      "hostname": "host001.example.com",
      "id": "SHA=e01f65d069b9035c280ea0bdba6cf6e47863ac074a170addbad26e98cc89925c",
      "ip": "192.0.2.2",
      "lastreport": "1582643957"
    },
    {
      "firstseen": "1578745692",
      "hostname": "hub.example.com",
      "id": "SHA=70138d580b9fd292ff856746df2fe7f9ded29db9ffca0c4d83acbbb97cde4d42",
      "ip": "192.0.2.1",
      "lastreport": "1582643974"
    }
  ],
  "meta": {
    "count": 2,
    "page": 1,
    "timestamp": 1582644064,
    "total": 7
  }
}'
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="json" >{
  "data": [
    {
      "firstseen": "1578745699",
      "hostname": "host001.example.com",
      "id": "SHA=e01f65d069b9035c280ea0bdba6cf6e47863ac074a170addbad26e98cc89925c",
      "ip": "192.0.2.1",
      "lastreport": "1582643957"
    },
    {
      "firstseen": "1578745692",
      "hostname": "hub.example.com",
      "id": "SHA=70138d580b9fd292ff856746df2fe7f9ded29db9ffca0c4d83acbbb97cde4d42",
      "ip": "104.236.18.209",
      "lastreport": "1582643974"
    }
  ],
  "meta": {
    "count": 2,
    "page": 1,
    "timestamp": 1582644064,
    "total": 7
  }
}
</code></pre>
</div>

</section>
<section>

<div class="org-src-container">
<label class="org-src-name">Extract a list of IPs from HOST API response</label>
<pre id="comma-seperated-list-of-ips-from-hostlist"><code class="sh" >echo $INPUT  | jq '.data | map(.ip) | join(",")'
</code></pre>
</div>

<div class="org-src-container">

<pre><code class="json" >192.0.2.2,192.0.2.1
</code></pre>
</div>

</section>
<section id="slide-orgd2657ad">
<h3 id="orgd2657ad"><code>cf-runagent</code></h3>
<div class="org-src-container">
<label class="org-src-name">Run policy on all hosts reporting <code>not_rh_satellite_registered</code></label>
<pre><code class="sh" >cf-runagent --background=3 --remote-bundles satellite_registration \
  -H $(curl -s -k --user $USER:$PASSWORD \
  https://$HUB/api/host\?count\=2\&amp;context-include\=not_rh_satellite_registered |\
  jq '.data | map(.ip) | join(",")'|tr -d '"')
</code></pre>
</div>

<aside class="notes">
<p>
Note: The host where cf-runagent is executed from <b>must</b> already have trust established.
</p>

</aside>

</section>
</section>
<section>
<section id="slide-org45021a0">
<h2 id="org45021a0">Additional Resources</h2>
<dl>
<dt><a href="https://build.cfengine.com">CFEngine Build</a></dt><dd>An index of CFEngine related content. Share your content and consume others!</dd>
<dt><a href="https://cf-learn.info/">Learning CFEngine</a></dt><dd>Widely considered best book to get a good grounding in CFEngine.</dd>
<dt><a href="http://www.cfenginetutorial.org/">CFEngine Tutorial</a></dt><dd>Training material published by Aleksey Tsalolikhin from Vertical Sysadmin, one of our partners.</dd>
<dt><a href="https://www.cfenginetutorial.org">VSA Training Material</a></dt><dd>Self paced in depth tutorial based on Vertical Sysadmin training coursework</dd>
<dt><a href="https://github.com/nickanderson/example-a10042">Example Policy Layout</a></dt><dd>An example policy layout</dd>
<dt><a href="https://github.com/syl20bnr/spacemacs/tree/master/layers/%252Btools/cfengine">CFEngine Spacemacs Layer</a></dt><dd>The best editor is neither Emacs nor Vim, it's Emacs and Vim!</dd>
<dt><a href="https://github.com/cfengine/core/tree/master/contrib/cf-locate"><code>cf-locate</code></a></dt><dd>Find and optionally display body and bundle definitions within a policy set</dd>
<dt><a href="https://docs.cfengine.com/docs/3.15/guide-writing-and-serving-policy-policy-style.html">Policy Style Guide</a></dt><dd>Write policy in a common style. Make it easier for others to quickly digest your policy.</dd>

</dl>

</section>
<section>

<dl>
<dt><a href="https://github.com/cfengineers-net/cf-keycrypt"><code>cf-keycrypt</code></a></dt><dd>Tool to encrypt data with CFEngine public keys (in core as of 3.16.0)
<ul>
<li>Allows to encrypt data for individual hosts using the public key</li>
<li>Can be used with non host keys for "group" encryption</li>

</ul></dd>
<dt><a href="http://www.cfengineers.net/downloads/cfengine-tools-and-utilities/"><code>cf-profile</code></a></dt><dd>Displays execution time summary for cf-agent run to find time consuming polices</dd>
<dt><a href="https://github.com/neilhwatson/vim_cf3"><code>vim_cf3</code></a></dt><dd>CFEngine 3 vim plugin with Syntax highlighting</dd>
<dt><a href="https://github.com/cfengine/core/blob/master/contrib/reindent.pl"><code>reindent.pl</code></a></dt><dd>Re-indent CFEngine policy using this script that leverages the excellent cfengine3 mode in Emacs</dd>
<dt><a href="https://github.com/naksu/cfengine_beautifier">Sublime Text 3 CFEngine Beautifier</a></dt><dd>Automatically reformat CFEngine policy in Sublime Text</dd>
<dt><a href="https://github.com/lastops/sublime-cfengine">Sublime Text 3 Syntax Highlighter &amp; Snippets</a></dt><dd>CFEngine Syntax highlighting and snippets for Sublime Text</dd>

</dl>

</section>
<section>

<dl>
<dt><a href="https://github.com/lpefferkorn/cfe-rsplaytime"><code>cfe-rsplaytime</code></a> </dt><dd>Compute splaytime for a given host</dd>
<dt><a href="https://github.com/lpefferkorn/cfe-profiler"><code>cfe-profiler</code></a></dt><dd>Measures bundle execution time helping to uncover the most time consuming bundles</dd>
<dt><a href="https://cfengine.com/cfengine-code-editors/">Editor support for CFEngine</a></dt><dd>A list of editors with references for making working with cfengine syntax easier</dd>
<dt><a href="https://www.youtube.com/watch?v=zviHfjKz1nM&amp;t=6s&amp;list=PLh71Vl9YjMajsWxT8zQuRKEPwosG9HdzV&amp;index=2">CFEngine in a Day</a></dt><dd>Old, but still good 4 part video series ~ 5 hours of <a href="https://en.wikipedia.org/wiki/Mark_Burgess_(computer_scientist)">Mark Burgess</a> (original author and founder) giving a one day training at <a href="https://www.surf.nl/en/about-surf/subsidiaries/surfsara/">SurfSara</a></dd>
<dt><a href="http://www.cfenginetutorial.org/">CFEngine Tutorial</a></dt><dd>Training material published by Aleksey Tsalolikhin from Vertical Sysadmin, one of our partners.</dd>
<dt><a href="https://docs.cfengine.com/docs/3.12/guide-faq.html">General FAQs</a></dt><dd>Frequently asked questions</dd>
<dt><a href="https://docs.cfengine.com/docs/3.12/enterprise-cfengine-guide-hub_administration.html">Hub Admin FAQ</a></dt><dd>Frequently asked questions about CFEngine Enterprise Hub administration</dd>

</dl>

</section>
</section>
<section>
<section id="slide-orge8782a0">
<h2 id="orge8782a0">Wrapping up</h2>
<p>
Please take a few moments to <a href="https://www.surveymonkey.com/r/CFEngine-Training">fill out this survey</a> about your experience: <a href="https://www.surveymonkey.com/r/CFEngine-Training">https://www.surveymonkey.com/r/CFEngine-Training</a>
</p>
</section>
</section>
<section>
<section id="slide-org0bcc48f">
<h2 id="org0bcc48f">Appendix</h2>
</section>
</section>
<section>
<section id="slide-org6f8c0ca">
<h2 id="org6f8c0ca">Git Primer</h2>

</section>
<section id="slide-org7547c4d">
<h3 id="org7547c4d">Git</h3>
<p>
Git is the most popular modern version control management tool. <a href="https://github.com">Github</a>,
<a href="https://bitbucket.org">Bitbucket</a>, and <a href="https://gitlab.com">GitLab</a> all provide great hosted and on prem repository management
solutions.
</p>

<p>
Using a git management system is reccomended for implementing access controls
and improved collaboration with regard to policy and systems management.
</p>

<aside class="notes">
<p>
CFEngine Enterprise tooling works with git out of the box. If you don't want
to use git the tooling is easily customized to support any version control
system.
</p>

</aside>

</section>
<section id="slide-org792cc16">
<h3 id="org792cc16">Getting started</h3>
<p>
Log into the policy server
</p>

<pre class="example" id="org6eda7de">
[user@workstation] $ vagrant ssh hub
[vagrant@hub] $ sudo -i
</pre>

<p>
Configure git author
</p>

<pre class="example" id="orgf9dffd5">
[root@hub masterfiles] # git config -–global user.name “Mr. Slate”
[root@hub masterfiles] # git config -–global user.email “bossman@slateco.com”
[root@hub masterfiles] # git config --global push.default simple
</pre>

</section>
<section id="slide-org1b244f2">
<h3 id="org1b244f2">Clone builtin repository</h3>
<pre class="example" id="org2670330">
[root@hub masterfiles] # git clone /opt/cfengine/masterfiles.git /vagrant/masterfiles
Cloning into '/vagrant/masterfiles'...
</pre>

<aside class="notes">
<p>
When an Enterprise hub is installed, a git repository is seeded with the stock
Masterfiles Policy Framework for that release. It provides an easy place to
play around with git and get setarted.
</p>

</aside>

</section>
<section id="slide-org09ea965">
<h3 id="org09ea965">Add a file to the repository</h3>
<pre class="example" id="orged7569d">
[root@hub masterfiles] # cd /vagrant/masterfiles
[root@hub masterfiles] # ls
cfe_internal  Changelog  controls  def.cf  lessons  lib  libraries  promises.cf  services  sketches  update  update.cf
[root@hub masterfiles] # echo hi &gt; file
[root@hub masterfiles] # git status
# On branch master
# Untracked files:
#   (use "git add &lt;file&gt;..." to include in what will be committed)
#
#	file
nothing added to commit but untracked files present (use "git add" to track)
</pre>

</section>
<section id="slide-orgf98cc78">
<h3 id="orgf98cc78">Stage and commit the changes</h3>
<pre class="example" id="orgd09ecb1">
[root@hub masterfiles] # git add file
[root@hub masterfiles] # git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD &lt;file&gt;..." to unstage)
#
#	new file:   file
#
# git commit -m “Testing git workflow”
[master c886caf] Testing git workflow
 0 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 file
</pre>

</section>
<section id="slide-orge9105d4">
<h3 id="orge9105d4">Publish the change</h3>
<pre class="example" id="org5437903">
[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
nothing to commit (working directory clean)
[root@hub masterfiles] # git push
Counting objects: 4, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 280 bytes, done.
Total 3 (delta 1), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
To /opt/cfengine/masterfiles.git
   ee31801..94b8151  master -&gt; master
# git status
# On branch master
nothing to commit (working directory clean)
</pre>

</section>
<section id="slide-org236891f">
<h3 id="org236891f">Modify a file</h3>
<pre class="example" id="org80d6159">
[root@hub masterfiles] # echo HI &gt;&gt; file
[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
# Changed but not updated:
#   (use "git add &lt;file&gt;..." to update what will be committed)
#   (use "git checkout -- &lt;file&gt;..." to discard changes in working directory)
#
#	modified:   file
#
no changes added to commit (use "git add" and/or "git commit -a")
</pre>

</section>
<section id="slide-orgc91dbc3">
<h3 id="orgc91dbc3">Diff to validate detail of content change</h3>
<pre class="example" id="orgda7968f">
[root@hub masterfiles] # git diff
diff --git a/file b/file
index 45b983b..313352b 100644
--- a/file
+++ b/file
@@ -1 +1,2 @@
 hi
+HI
</pre>

</section>
<section id="slide-org595932c">
<h3 id="org595932c">Stage and commit the changes</h3>
<pre class="example" id="org045ceab">
[root@hub masterfiles] # git add file
[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
# Changes to be committed:
#   (use "git reset HEAD &lt;file&gt;..." to unstage)
#
#	modified:   file
#
# git commit -m "Modified file"
[master fd94885] Modified file
 1 files changed, 1 insertions(+), 0 deletions(-)
# git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commits.
#
nothing to commit (working directory clean)
</pre>

</section>
<section id="slide-org2c22789">
<h3 id="org2c22789">Publish the change</h3>
<pre class="example" id="orge113574">
[root@hub masterfiles] # git push
Counting objects: 7, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (5/5), 493 bytes, done.
Total 5 (delta 2), reused 0 (delta 0)
Unpacking objects: 100% (5/5), done.
To /opt/cfengine/masterfiles.git
   c886caf..fd94885  master -&gt; master
</pre>

</section>
<section id="slide-org62ab808">
<h3 id="org62ab808">Remove a file</h3>
<pre class="example" id="org20ac9cc">
[root@hub masterfiles] # git rm file
# rm 'file'
[root@hub masterfiles] # git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD &lt;file&gt;..." to unstage)
#
#	deleted:    file
#
# git commit -m "Remove file"
[master 4c9d46d] Remove file
 1 files changed, 0 insertions(+), 3 deletions(-)
 delete mode 100644 file
</pre>

</section>
<section id="slide-org9b643c4">
<h3 id="org9b643c4">Publish the change</h3>
<pre class="example" id="orgd2bdc1c">
[root@hub masterfiles] # git push
Counting objects: 3, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 230 bytes, done.
Total 2 (delta 1), reused 0 (delta 0)
Unpacking objects: 100% (2/2), done.
To /opt/cfengine/masterfiles.git
   92660a9..4c9d46d  master -&gt; master
</pre>

</section>
<section id="slide-org328f5d1">
<h3 id="org328f5d1">Place masterfiles into the repository</h3>
<pre class="example" id="org9f492b2">
[root@hub masterfiles] # rsync -avz /var/cfengine/masterfiles/ .
[root@hub masterfiles] # git add -A
[root@hub masterfiles] # git commit -m "Seed repository with masterfiles"
[root@hub masterfiles] # git push
</pre>

</section>
<section id="slide-org3a00d32">
<h3 id="org3a00d32">Configure masterfiles for git integration</h3>
<pre class="example" id="orgb4438d9">
[root@hub masterfiles]# echo '{ "classes": { "cfengine_internal_masterfiles_update": [ "policy_server" ] } }' &gt; def.json
[root@hub masterfiles]# git add def.json
[root@hub masterfiles]# git commit -m "Enable automatic masterfiles update from repository"
[master c206654] Enable automatic masterfiles update from repository
 1 file changed, 1 insertion(+)
 create mode 100644 def.json
[root@hub masterfiles]# git push
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:

  git config --global push.default matching

To squelch this message and adopt the new behavior now, use:

  git config --global push.default simple

See 'git help config' and search for 'push.default' for further information.
(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode
'current' instead of 'simple' if you sometimes use older versions of Git)

Counting objects: 4, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 370 bytes | 0 bytes/s, done.
Total 3 (delta 1), reused 0 (delta 0)
To /opt/cfengine/masterfiles.git
   a181449..c206654  master -&gt; master
</pre>

</section>
<section id="slide-orgf734979">
<h3 id="orgf734979">Activate current update policy with enablement class</h3>
<pre class="example" id="org0eedf88">
[root@hub masterfiles]# cf-agent --no-lock \
--verbose \
--define cfengine_internal_masterfiles_update \
--file update.cf
</pre>

</section>
<section id="slide-orged58ee8">
<h3 id="orged58ee8">Verify presence of def.json</h3>
<pre class="example" id="org1aaa58f">
[root@hub masterfiles]# cat /var/cfengine/masterfiles/def.json
</pre>

<aside class="notes">
<p>
As you recall, we put the def.json into the repository not in
<code>/var/cfengine/masterfiles</code> directly. We want to make sure that masterfiles is
updating from our repository.
</p>

</aside>

</section>
<section id="slide-org848ac70">
<h3 id="org848ac70">Review</h3>
<p>
Now when the agent runs on hosts that define <code>policy_server</code> policy will be
activated that keeps <code>/var/cfengine/masterfiles</code> up to date with whats in the
repository as configured in mission portal (which by default is
<code>/opt/cfengine/masterfiles.git</code>).
</p>

<p>
This means new policy will be distributed as you push it into the repository.
<a href="https://en.wikipedia.org/wiki/Continuous_delivery">Continuous delivery</a> FTW!
</p>

</section>
<section id="slide-orgdd6943b">
<h3 id="orgdd6943b">Git command reference</h3>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">


<colgroup>
<col  class="org-left" />

<col  class="org-left" />
</colgroup>
<tbody>
<tr>
<td class="org-left"><code>git status</code></td>
<td class="org-left"><code>git pull --rebase</code></td>
</tr>

<tr>
<td class="org-left"><code>git diff</code></td>
<td class="org-left"><code>git grep</code></td>
</tr>

<tr>
<td class="org-left"><code>git add</code></td>
<td class="org-left"><code>git log</code></td>
</tr>

<tr>
<td class="org-left"><code>git diff --cached</code></td>
<td class="org-left"><code>git checkout -b new_feature</code></td>
</tr>

<tr>
<td class="org-left"><code>git commit</code></td>
<td class="org-left"><code>git push origin &lt;branch&gt;</code></td>
</tr>
</tbody>
</table>

</section>
<section id="slide-org1606b94">
<h3 id="org1606b94">Pop Quiz</h3>
<ul class="fragment roll-in">
<li>Who was Mr. Slate?</li>

</ul>

<ul class="fragment roll-in">
<li>How do you get an overview of the changes to your clone?</li>

</ul>

<ul class="fragment roll-in">
<li>How can you easily search a git repository?</li>

</ul>

<aside class="notes">
<dl>
<dt>Who was Mr. Slate?</dt><dd>Fred Flintstones Boss on The Flintstones</dd>
<dt>How do you get an overview of the changes to your clone?</dt><dd><code>git status</code></dd>
<dt>How can you easily search a git repository?</dt><dd><code>git grep</code></dd>

</dl>

</aside>
</section>
</section>
</div>
</div>
<p> CFEngine </p>
<script src="./reveal.js/dist/reveal.js"></script>
<script src="./reveal.js/plugin/markdown/markdown.js"></script>
<script src="./reveal.js/plugin/notes/notes.js"></script>
<script src="./reveal.js/plugin/highlight/highlight.js"></script>
<script>
// Full list of configuration options available here:
// https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({

controls: false,
progress: true,
history: false,
center: true,
slideNumber: 'c',
rollingLinks: true,
keyboard: true,
mouseWheel: false,
fragmentInURL: false,
hashOneBasedIndex: false,
pdfSeparateFragments: true,
overview: true,
width: 1280,
height: 1024,

transition: 'fade',
transitionSpeed: 'default',

// Plugins with reveal.js 4.x
plugins: [ RevealMarkdown, RevealNotes, RevealHighlight ],

// Optional libraries used to extend reveal.js
dependencies: [
]

});
</script>
</body>
</html>