-
Notifications
You must be signed in to change notification settings - Fork 1
/
incident-reports.html
299 lines (281 loc) · 12.2 KB
/
incident-reports.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
<!DOCTYPE html>
<html class="writer-html5" lang="en" >
<head>
<meta charset="utf-8" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Incident Reports — E2X H-BRS</title>
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
<!--[if lt IE 9]>
<script src="_static/js/html5shiv.min.js"></script>
<![endif]-->
<script src="_static/jquery.js"></script>
<script src="_static/_sphinx_javascript_frameworks_compat.js"></script>
<script data-url_root="./" id="documentation_options" src="_static/documentation_options.js"></script>
<script src="_static/doctools.js"></script>
<script src="_static/sphinx_highlight.js"></script>
<script src="_static/js/theme.js"></script>
<link rel="author" title="About these documents" href="about.html" />
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="News" href="news.html" />
<link rel="prev" title="People" href="people.html" />
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search" >
<a href="index.html" class="icon icon-home">
E2X H-BRS
<img src="_static/e2x.png" class="logo" alt="Logo"/>
</a>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
<input type="text" name="q" placeholder="Search docs" aria-label="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="about.html">About</a></li>
<li class="toctree-l1"><a class="reference internal" href="research.html">Research</a></li>
<li class="toctree-l1"><a class="reference internal" href="talks.html">Talks</a></li>
<li class="toctree-l1"><a class="reference internal" href="people.html">People</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Incident Reports</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#id2">21.03.2022</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id3">24.11.2021</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id4">10.03.2021</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id5">21.10.2020</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id6">24.07.2020</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id7">15.07.2020</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="news.html">News</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">Usage</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="usage/student.html">Students</a></li>
<li class="toctree-l1"><a class="reference internal" href="usage/instructor.html">Instructors</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">JupyterHub</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="jupyterhub/e2x-jupyterhub.html">E2x JupyterHub</a></li>
<li class="toctree-l1"><a class="reference internal" href="jupyterhub/environment.html">Environment</a></li>
<li class="toctree-l1"><a class="reference internal" href="jupyterhub/dynamic-config.html">Dynamic Configuration</a></li>
<li class="toctree-l1"><a class="reference internal" href="jupyterhub/deployment.html">Deployment</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">E2xgrader</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="e2xgrader/e2xgrader.html">E2xgrader</a></li>
<li class="toctree-l1"><a class="reference internal" href="e2xgrader/installation.html">E2xgrader Installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="e2xgrader/configuration.html">E2xgrader Configuration</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">Nbassignment</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="nbassignment/nbassignment.html">Nbassignment</a></li>
<li class="toctree-l1"><a class="reference internal" href="nbassignment/installation.html">Nbassignment Installation</a></li>
</ul>
<p class="caption" role="heading"><span class="caption-text">ExamKernel</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="exam_kernel/exam_kernel.html">Exam Kernel</a></li>
<li class="toctree-l1"><a class="reference internal" href="exam_kernel/installation.html">ExamKernel Installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="exam_kernel/configuration.html">ExamKernel Configuration</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="index.html">E2X H-BRS</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="index.html" class="icon icon-home" aria-label="Home"></a></li>
<li class="breadcrumb-item active">Incident Reports</li>
<li class="wy-breadcrumbs-aside">
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<section id="incident-reports">
<span id="id1"></span><h1>Incident Reports<a class="headerlink" href="#incident-reports" title="Permalink to this heading"></a></h1>
<section id="id2">
<h2>21.03.2022<a class="headerlink" href="#id2" title="Permalink to this heading"></a></h2>
<ul>
<li><p>Summary:</p>
<ul class="simple">
<li><p>Safe Exam Browser (SEB) asks for an admin passoword on the client side (Windows)</p></li>
<li><p>SEB client is already running (macOS)</p></li>
</ul>
</li>
<li><p>Solution:</p>
<ul>
<li><p>Windows</p>
<ul class="simple">
<li><p>Navigate to <cite>C:\Users\<PC_USER>\AppData\Roaming\SafeExamBrowser</cite>
(Replace <PC_USER> with your PC name)</p></li>
<li><p>Remove <cite>SebClientSettings</cite></p></li>
</ul>
</li>
<li><p>MacOS</p>
<ul>
<li><p>Close SEB</p></li>
<li><p>Open terminal and run</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>defaults<span class="w"> </span>delete<span class="w"> </span>org.safeexambrowser.SafeExamBrowser
</pre></div>
</div>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</section>
<section id="id3">
<h2>24.11.2021<a class="headerlink" href="#id3" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Summary:</p>
<ul>
<li><p>Midterm: MRC-Midterm-WS21</p></li>
<li><p>The seb config did not work on some student laptops:
* On Windows: SEB service was nor running
* On Mac: SEB was already running</p></li>
<li><p>Some students who came in person to the exam room brought laptops which do not have LAN port.</p></li>
</ul>
</li>
</ul>
</section>
<section id="id4">
<h2>10.03.2021<a class="headerlink" href="#id4" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Summary:</p>
<ul>
<li><p>Exam: WuS-WS20 trial</p></li>
<li><p>The connection to the server was sluggish after resizing some openstack instances.</p></li>
<li><p>Four k8s nodes were not accessible from the load balancer instance.</p></li>
<li><p>OpenStack scheduler failed to schedule a big instance to a proper hardware node,
which resulted in OOM in that hardware node, thus killed the networking.</p></li>
</ul>
</li>
<li><p>Actions taken</p>
<ul>
<li><p>[e2x sysadmin] found out which nodes were affected.</p></li>
<li><p>[fb02 sysadmin] did live migration and fix the scheduler.</p></li>
</ul>
</li>
<li><p>Future consideration before resizing an instance: inform fb02 sysadmin</p></li>
</ul>
</section>
<section id="id5">
<h2>21.10.2020<a class="headerlink" href="#id5" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Summary:</p>
<ul>
<li><p>Exam: RP-SS20</p></li>
<li><p>Autosave was broken during the exam and this happened to three student servers.
The manual save did not work too. When they saved the notebook, it says “Autosave Failed! last checkpoint 1 Hour ago”.</p></li>
</ul>
</li>
<li><p>Actions taken during the exam</p>
<ul>
<li><p>Asked them to back up the notebook locally</p>
<ul>
<li><p>Print it into pdf</p></li>
<li><p>Bakcup all answer cells into a text file</p></li>
</ul>
</li>
<li><p>Close and shutdown the notebook server</p></li>
<li><p>Copy the answers from backup file to the notebook</p></li>
</ul>
</li>
<li><p>Solutions:</p>
<ul>
<li><p>Reproduce this error</p></li>
<li><p>Enable create notebook for student to make a backup into a jupyter notebook file instead of backing it up locally</p></li>
<li><p>Enable “Clear output” button</p></li>
<li><p>Clearing the output makes the autosave work again (this solution was suggested
by some students, and it worked for them). This was caused by some plots.
The feature has been added to e2xgrader by this <a class="reference external" href="https://github.com/DigiKlausur/e2xgrader/pull/26">pull request</a>.</p></li>
</ul>
</li>
</ul>
</section>
<section id="id6">
<h2>24.07.2020<a class="headerlink" href="#id6" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Summary:</p>
<ul>
<li><p>Exam: WuS-WS19</p></li>
<li><p>During WuS Klausur GrA, One of the node OOM due to being populated by 35 students
(resource request calculation was wrong). One solution, double minimum requests.</p></li>
</ul>
</li>
<li><p>Actions taken during the exam</p>
<ul>
<li><p>Increased the resource req to 0.5GB per students so that they are evenly distributed</p></li>
<li><p>Not all students server were shutdown because they were working on the exam</p></li>
</ul>
</li>
<li><p>Actions taken after exam for GrB</p>
<ul>
<li><p>Increased the resource req to 0.5GB, and they were evenly distributed</p></li>
</ul>
</li>
<li><p>Solutions:</p>
<ul>
<li><p>Double min cpu and mem so that they can be scheduled evenly across multiple nodes</p></li>
<li><p>Ask Christoph (FB02) to provide c4.m24 (4Vcpu and 24Gb mem), node with this
resource can handle up to 40 students (assuming the requirement is about 250MB
to run the notebook, and thus the request is 500MB (twice as much as requirement)).
This is actually not necessary since we already have c2.m12</p></li>
</ul>
</li>
</ul>
</section>
<section id="id7">
<h2>15.07.2020<a class="headerlink" href="#id7" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Summary:</p>
<ul>
<li><p>The time in the laptops did not sync with the server because the ntp server was blocked by the firewall.</p></li>
</ul>
</li>
<li><p>Solution:</p>
<ul>
<li><p>Enable ntp server in the lernstick and recopy the image</p></li>
</ul>
</li>
</ul>
</section>
</section>
</div>
</div>
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
<a href="people.html" class="btn btn-neutral float-left" title="People" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="news.html" class="btn btn-neutral float-right" title="News" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
<div role="contentinfo">
<p>© Copyright 2023, E2X H-BRS.</p>
</div>
Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a
<a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a>
provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script>
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
</body>
</html>