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Kubernetes transport plugin for Chef Inspec Train

This plugin allows applications that rely on Train to communicate with the Kubernetes API. For example, InSpec uses this to perform compliance checks against any resource in the Kubernetes API. Train plugins are managed by InSpec CLI.

Usage

When used in combination with the InSpec Kubernetes Resource Pack you can validate the spec of any Kubernetes resource you have access to:

describe k8sobjects(api: 'v1', type: 'pods', namespace: 'default', labelSelector: 'run=nginx') do
  it { should exist }
  ...
end
describe k8sobjects(api: 'v1', type: 'namespaces', labelSelector: 'myns=prod') do
  it { should exist }
  ...
end
describe k8sobject(api: 'v1', type: 'pod', namespace: 'default', name: 'my-pod') do
  it { should exist }
  its('name') { should eq 'my-pod' }
  ...
end

File resource

inspec.backend.file('PATH', pod: 'POD', container: 'CONTAINER', namespace: 'NAMESPACE')

Currently it supports only Linux based containers

Preconditions

  • InSpec 3.7+ or 4.x+
  • Ruby 2.4+
  • You have set the env var KUBECONFIG or have a valid ~/.kube/config

Installation

NOTE: The train-kubernetes plugin now comes included with InSpec 5.22.0 and later, and does not require installation separately.

Train plugins are distributed as gems. You may choose to manage the gem yourself, but if you are an InSpec user, InSPec can handle it for you.

First, run:

gem install train-kubernetes

Next, run:

inspec plugin install train-kubernetes

Next, view the plugins.json:

vi ~/.inspec/plugins.json

If it has the version set to "= 0.1.3", modify it to "0.1.3" and save the file.

Verify the plugin:

inspec plugin list

inspec detect -t k8s://

== Platform Details

Name:      k8s
Families:  cloud, api
Release:   0.1.3

Troubleshooting (Only applicable for InSpec version 5.21.* and earlier)

If you run into issues installing via inspec plugin install train-kubernetes, try:

  • Try running gem install train-kubernetes before inspec plugin install train-kubernetes.
  • Ensure the ~/.inspec/plugins.json has "0.1.3" and not "= 0.1.3" for the version value. Modify it by hand if needed.
  • Ensure you can cleanly install the k8s-ruby gem version 0.10.4 or greater. e.g. gem install k8s-ruby -v 0.10.4
  • Ensure that only one version of the excon gem is installed. e.g. gem list | grep excon. If you see two versions, gem uninstall excon and remove the older version.

Reporting Issues

Bugs, typos, limitations, and frustrations are welcome to be reported through the GitHub issues page for the train-kubernetes project.

You may also ask questions in the #inspec channel of the Chef Community Slack team. However, for an issue to get traction, please report it as a github issue.

Development Process

If you wish to contribute to this plugin, please use the usual fork-branch-push-PR cycle. All functional changes need new tests, and bugfixes are expected to include a new test that demonstrates the bug.

Reference Information

Plugin Development is documented on the train project on GitHub.