community.general.docker_image_info – Inspect docker images

Note

This plugin is part of the community.general collection (version 1.3.6).

To install it use: ansible-galaxy collection install community.general.

To use it in a playbook, specify: community.general.docker_image_info.

Synopsis

• Provide one or more image names, and the module will inspect each, returning an array of inspection results.

• If an image does not exist locally, it will not appear in the results. If you want to check whether an image exists locally, you can call the module with the image name, then check whether the result list is empty (image does not exist) or has one element (the image exists locally).

• The module will not attempt to pull images from registries. Use community.general.docker_image with source set to pull to ensure an image is pulled.

Requirements

The below requirements are needed on the host that executes this module.

• Docker API >= 1.20

• Docker SDK for Python: Please note that the docker-py Python module has been superseded by docker (see here for details). For Python 2.6, docker-py must be used. Otherwise, it is recommended to install the docker Python module. Note that both modules should not be installed at the same time. Also note that when both modules are installed and one of them is uninstalled, the other might no longer function and a reinstall of it is required.

• Docker SDK for Python >= 1.8.0 (use docker-py for Python 2.6)

Parameters

Parameter	Choices/Defaults	Comments
api_version string	Default: "auto"	The version of the Docker API running on the Docker Host. Defaults to the latest version of the API supported by Docker SDK for Python and the docker daemon. If the value is not specified in the task, the value of environment variable DOCKER_API_VERSION will be used instead. If the environment variable is not set, the default value will be used. aliases: docker_api_version
ca_cert path		Use a CA certificate when performing server verification by providing the path to a CA certificate file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file ca.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_ca_cert, cacert_path
client_cert path		Path to the client's TLS certificate file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file cert.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_client_cert, cert_path
client_key path		Path to the client's TLS key file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file key.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_client_key, key_path
debug boolean	Choices: no ← yes	Debug mode
docker_host string	Default: "unix://var/run/docker.sock"	The URL or Unix socket path used to connect to the Docker API. To connect to a remote host, provide the TCP connection string. For example, tcp://192.0.2.23:2376. If TLS is used to encrypt the connection, the module will automatically replace tcp in the connection URL with https. If the value is not specified in the task, the value of environment variable DOCKER_HOST will be used instead. If the environment variable is not set, the default value will be used. aliases: docker_url
name list / elements=string		An image name or a list of image names. Name format will be name[:tag] or repository/name[:tag], where tag is optional. If a tag is not provided, latest will be used. Instead of image names, also image IDs can be used. If no name is provided, a list of all images will be returned.
ssl_version string		Provide a valid SSL version number. Default value determined by ssl.py module. If the value is not specified in the task, the value of environment variable DOCKER_SSL_VERSION will be used instead.
timeout integer	Default: 60	The maximum amount of time in seconds to wait on a response from the API. If the value is not specified in the task, the value of environment variable DOCKER_TIMEOUT will be used instead. If the environment variable is not set, the default value will be used.
tls boolean	Choices: no ← yes	Secure the connection to the API by using TLS without verifying the authenticity of the Docker host server. Note that if validate_certs is set to yes as well, it will take precedence. If the value is not specified in the task, the value of environment variable DOCKER_TLS will be used instead. If the environment variable is not set, the default value will be used.
tls_hostname string	Default: "localhost"	When verifying the authenticity of the Docker Host server, provide the expected name of the server. If the value is not specified in the task, the value of environment variable DOCKER_TLS_HOSTNAME will be used instead. If the environment variable is not set, the default value will be used.
validate_certs boolean	Choices: no ← yes	Secure the connection to the API by using TLS and verifying the authenticity of the Docker host server. If the value is not specified in the task, the value of environment variable DOCKER_TLS_VERIFY will be used instead. If the environment variable is not set, the default value will be used. aliases: tls_verify

Notes

Note

• This module was called docker_image_facts before Ansible 2.8. The usage did not change.

• Connect to the Docker daemon by providing parameters with each task or by defining environment variables. You can define DOCKER_HOST, DOCKER_TLS_HOSTNAME, DOCKER_API_VERSION, DOCKER_CERT_PATH, DOCKER_SSL_VERSION, DOCKER_TLS, DOCKER_TLS_VERIFY and DOCKER_TIMEOUT. If you are using docker machine, run the script shipped with the product that sets up the environment. It will set these variables for you. See https://docs.docker.com/machine/reference/env/ for more details.

• When connecting to Docker daemon with TLS, you might need to install additional Python packages. For the Docker SDK for Python, version 2.4 or newer, this can be done by installing docker[tls] with ansible.builtin.pip.

• Note that the Docker SDK for Python only allows to specify the path to the Docker configuration for very few functions. In general, it will use $HOME/.docker/config.json if the DOCKER_CONFIG environment variable is not specified, and use $DOCKER_CONFIG/config.json otherwise.

Examples

- name: Inspect a single image
  community.general.docker_image_info:
    name: pacur/centos-7

- name: Inspect multiple images
  community.general.docker_image_info:
    name:
      - pacur/centos-7
      - sinatra
  register: result

- name: Make sure that both images pacur/centos-7 and sinatra exist locally
  ansible.builtin.assert:
    that:
      - result.images | length == 2

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key	Returned	Description
images list / elements=dictionary	always	Inspection results for the selected images. The list only contains inspection results of images existing locally. Sample: [{'Architecture': 'amd64', 'Author': '', 'Comment': '', 'Config': {'AttachStderr': False, 'AttachStdin': False, 'AttachStdout': False, 'Cmd': ['/etc/docker/registry/config.yml'], 'Domainname': '', 'Entrypoint': ['/bin/registry'], 'Env': ['PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'], 'ExposedPorts': {'5000/tcp': {}}, 'Hostname': 'e5c68db50333', 'Image': 'c72dce2618dc8f7b794d2b2c2b1e64e0205ead5befc294f8111da23bd6a2c799', 'Labels': {}, 'OnBuild': [], 'OpenStdin': False, 'StdinOnce': False, 'Tty': False, 'User': '', 'Volumes': {'/var/lib/registry': {}}, 'WorkingDir': ''}, 'Container': 'e83a452b8fb89d78a25a6739457050131ca5c863629a47639530d9ad2008d610', 'ContainerConfig': {'AttachStderr': False, 'AttachStdin': False, 'AttachStdout': False, 'Cmd': ['/bin/sh', '-c', '#(nop) CMD ["/etc/docker/registry/config.yml"]'], 'Domainname': '', 'Entrypoint': ['/bin/registry'], 'Env': ['PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'], 'ExposedPorts': {'5000/tcp': {}}, 'Hostname': 'e5c68db50333', 'Image': 'c72dce2618dc8f7b794d2b2c2b1e64e0205ead5befc294f8111da23bd6a2c799', 'Labels': {}, 'OnBuild': [], 'OpenStdin': False, 'StdinOnce': False, 'Tty': False, 'User': '', 'Volumes': {'/var/lib/registry': {}}, 'WorkingDir': ''}, 'Created': '2016-03-08T21:08:15.399680378Z', 'DockerVersion': '1.9.1', 'GraphDriver': {'Data': None, 'Name': 'aufs'}, 'Id': '53773d8552f07b730f3e19979e32499519807d67b344141d965463a950a66e08', 'Name': 'registry:2', 'Os': 'linux', 'Parent': 'f0b1f729f784b755e7bf9c8c2e65d8a0a35a533769c2588f02895f6781ac0805', 'RepoDigests': [], 'RepoTags': ['registry:2'], 'Size': 0, 'VirtualSize': 165808884}]

Authors

• Chris Houseknecht (@chouseknecht)