---
title: About the docker Resource
---

# docker

Use the `docker` InSpec audit resource to test configuration data for docker daemon. It is a very comprehensive resource. Please have a look at [docker_container](docker_container) and [docker_image](docker_image), too.

## Syntax

A `docker` resource block declares allows you to write test for many containers:

    describe docker.containers do
      its('images') { should_not include 'u12:latest' }
    end

or:

    describe docker.containers.where { name == 'flamboyant_colden' } do
      it { should be_running }
    end

where

* `.where()` may specify a specific item and value, to which the matchers are compared
* `commands`, `ids`, `images`, `labels`, `local_volumes`, `mounts`, `names`, `networks`, `ports`, `sizes`  and `'status'` are valid matchers for `containers`

The `docker` resource block also declares allows you to write test for many images:

    describe docker.images do
      its('repositories') { should_not include 'inssecure_image' }
    end

or if you want to query specific images:

    describe docker.images.where { repository == 'ubuntu' && tag == '12.04' } do
      it { should_not exist }
    end

where

* `.where()` may specify a specific item and value, to which the matchers are compared
* `commands`, `ids`, `images`, `labels`, `local_volumes`, `mounts`, `names`, `networks`, `ports`, `sizes`  and `'status'` are valid matchers for `containers`



## Matchers

This InSpec audit resource has the following matchers:

### containers

`containers` returns information about containers as returned by [docker ps -a](https://docs.docker.com/engine/reference/commandline/ps/). You can determine specific information about

    describe docker.containers do
      its('ids') { should include 'sha:71b5df59...442b' }
      its('commands') { should_not include '/bin/sh' }
      its('images') { should_not include 'u12:latest' }
      its('ports') { should include '0.0.0.0:1234->1234/tcp' }
      its('labels') { should include 'License=GPLv2,Vendor=CentOS' }
    end


### images

`images` returns information about docker image as returned by [docker images](https://docs.docker.com/engine/reference/commandline/images/). You can determine specific information about

    describe docker.images do
      its('ids') { should include 'sha:12b5df59...442b' }
      its('repositories') { should_not include 'my_image' }
      its('tags') { should_not include 'unwanted_tag' }
      its('sizes') { should_not include "1.41 GB" }
    end

### version

`info` returns the parsed result of [docker version](https://docs.docker.com/engine/reference/commandline/version/)

    describe docker.version do
      its('Server.Version') { should cmp >= '1.12'}
      its('Client.Version') { should cmp >= '1.12'}
    end


### info

`info` returns the parsed result of [docker info](https://docs.docker.com/engine/reference/commandline/info/)

    describe docker.info do
      its('Configuration.Path') { should eq 'value' }
    end


### object('id')

`object` returns low-level information about docker objects. It is calling [docker inspect](https://docs.docker.com/engine/reference/commandline/info/) under the hood.

    describe docker.object(id) do
      its('Configuration.Path') { should eq 'value' }
    end


## Examples

The following examples show how to use this InSpec audit resource.

### Return all running containers

    docker.containers.running?.ids.each do |id|
      describe docker.object(id) do
        its('State.Health.Status') { should eq 'healthy' }
      end
    end

### Verify a Docker Server and Client version

    describe docker.version do
      its('Server.Version') { should cmp >= '1.12'}
      its('Client.Version') { should cmp >= '1.12'}
    end

### Iterate over all containers to verify host coniguration

    docker.containers.ids.each do |id|
      # call docker inspect for a specific container id
      describe docker.object(id) do
        its(%w(HostConfig Privileged)) { should cmp false }
        its(%w(HostConfig Privileged)) { should_not cmp true }
      end
    end

### Iterate over all images to verify the container was built without ADD instruction

    docker.images.ids.each do |id|
      describe command("docker history #{id}| grep 'ADD'") do
        its('stdout') { should eq '' }
      end
    end

### Verify that health-checks are enabled for a container

    describe docker.object('71b5df59442b') do
      its(%w(Config Healthcheck)) { should_not eq nil }
    end

### Run the DevSec docker baseline  profile

There are two ways to run the `docker-baseline` profile to test Docker via the `docker` resource.

Clone the profile:

    $ git clone https://github.com/dev-sec/cis-docker-benchmark.git

and then run:

    $ inspec exec cis-docker-benchmark

Or execute the profile directly via URL:

    $ inspec exec https://github.com/dev-sec/cis-docker-benchmark