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104 lines
2.1 KiB
Text
104 lines
2.1 KiB
Text
---
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title: About the docker_image Resource
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platform: linux
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---
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# docker_image
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Use the `docker_image` Chef InSpec audit resource to verify a Docker image.
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<br>
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## Availability
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### Installation
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This resource is distributed along with Chef InSpec itself. You can use it automatically.
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### Version
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This resource first became available in v1.21.0 of InSpec.
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## Syntax
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A `docker_image` resource block declares the image:
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describe docker_image('alpine:latest') do
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it { should exist }
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its('id') { should eq 'sha256:4a415e...a526' }
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its('repo') { should eq 'alpine' }
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its('tag') { should eq 'latest' }
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end
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<br>
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## Resource Parameter Examples
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The resource allows you to pass in an image id:
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describe docker_image(id: alpine_id) do
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...
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end
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If the tag is missing for an image, `latest` is assumed as default:
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describe docker_image('alpine') do
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...
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end
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You can also pass in repository and tag as separate values
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describe docker_image(repo: 'alpine', tag: 'latest') do
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...
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end
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<br>
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## Property Examples
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### id
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The `id` property returns the full image id:
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its('id') { should eq 'sha256:4a415e3663882fbc554ee830889c68a33b3585503892cc718a4698e91ef2a526' }
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### image
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The `image` property tests the value of the image. It is a combination of `repository/tag`:
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its('image') { should eq 'alpine:latest' }
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### repo
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The `repo` property tests the value of the repository name:
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its('repo') { should eq 'alpine' }
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### tag
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The `tag` property tests the value of image tag:
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its('tag') { should eq 'latest' }
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### Test a Docker image
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describe docker_image('alpine:latest') do
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it { should exist }
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its('id') { should eq 'sha256:4a415e...a526' }
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its('image') { should eq 'alpine:latest' }
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its('repo') { should eq 'alpine' }
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its('tag') { should eq 'latest' }
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end
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<br>
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## Matchers
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For a full list of available matchers, please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
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### exist
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The `exist` matcher tests if the image is available on the node:
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it { should exist }
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