community.docker.docker_host_info module – Retrieves facts about docker host and lists of objects of the services.

Note

This module is part of the community.docker collection (version 2.7.1).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

To install it, use: ansible-galaxy collection install community.docker.

To use it in a playbook, specify: community.docker.docker_host_info.

Synopsis

  • Retrieves facts about a docker host.

  • Essentially returns the output of docker system info.

  • The module also allows to list object names for containers, images, networks and volumes. It also allows to query information on disk usage.

  • The output differs depending on API version of the docker daemon.

  • If the docker daemon cannot be contacted or does not meet the API version requirements, the module will fail.

Requirements

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

  • Docker API >= 1.21

  • Docker SDK for Python: Please note that the docker-py Python module has been superseded by docker (see here for details).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 >= 1.10.0 (use docker-py for Python 2.6)

Parameters

Parameter

Comments

api_version

aliases: docker_api_version

string

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.

Default: “auto”

ca_cert

aliases: tls_ca_cert, cacert_path

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.

client_cert

aliases: tls_client_cert, cert_path

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.

client_key

aliases: tls_client_key, key_path

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.

containers

boolean

Whether to list containers.

Choices:

  • no ← (default)

  • yes

containers_filters

dictionary

A dictionary of filter values used for selecting containers to list.

For example, until: 24h.

label is a special case of filter which can be a string <key> matching when a label is present, a string <key>=<value> matching when a label has a particular value, or a list of strings <key>/<key>=<value.

See the docker documentation for more information on possible filters.

debug

boolean

Debug mode

Choices:

  • no ← (default)

  • yes

disk_usage

boolean

Summary information on used disk space by all Docker layers.

The output is a sum of images, volumes, containers and build cache.

Choices:

  • no ← (default)

  • yes

docker_host

aliases: docker_url

string

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.

Default: “unix://var/run/docker.sock”

images

boolean

Whether to list images.

Choices:

  • no ← (default)

  • yes

images_filters

dictionary

A dictionary of filter values used for selecting images to list.

For example, dangling: true.

label is a special case of filter which can be a string <key> matching when a label is present, a string <key>=<value> matching when a label has a particular value, or a list of strings <key>/<key>=<value.

See the docker documentation for more information on possible filters.

networks

boolean

Whether to list networks.

Choices:

  • no ← (default)

  • yes

networks_filters

dictionary

A dictionary of filter values used for selecting networks to list.

label is a special case of filter which can be a string <key> matching when a label is present, a string <key>=<value> matching when a label has a particular value, or a list of strings <key>/<key>=<value.

See the docker documentation for more information on possible filters.

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

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.

Default: 60

tls

boolean

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 true 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.

Choices:

  • no ← (default)

  • yes

tls_hostname

string

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.

The current default value is localhost. This default is deprecated and will change in community.docker 2.0.0 to be a value computed from docker_host. Explicitly specify localhost to make sure this value will still be used, and to disable the deprecation message which will be shown otherwise.

use_ssh_client

boolean

added in 1.5.0 of community.docker

For SSH transports, use the ssh CLI tool instead of paramiko.

Requires Docker SDK for Python 4.4.0 or newer.

Choices:

  • no ← (default)

  • yes

validate_certs

aliases: tls_verify

boolean

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.

Choices:

  • no ← (default)

  • yes

verbose_output

boolean

When set to true and networks, volumes, images, containers or disk_usage is set to true then output will contain verbose information about objects matching the full output of API method. For details see the documentation of your version of Docker API at https://docs.docker.com/engine/api/.

The verbose output in this module contains only subset of information returned by _info module for each type of the objects.

Choices:

  • no ← (default)

  • yes

volumes

boolean

Whether to list volumes.

Choices:

  • no ← (default)

  • yes

volumes_filters

dictionary

A dictionary of filter values used for selecting volumes to list.

label is a special case of filter which can be a string <key> matching when a label is present, a string <key>=<value> matching when a label has a particular value, or a list of strings <key>/<key>=<value.

See the docker documentation for more information on possible filters.

Notes

Note

  • 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.

  • This module uses the Docker SDK for Python to communicate with the Docker daemon.

Examples

- name: Get info on docker host
  community.docker.docker_host_info:
  register: result

- name: Get info on docker host and list images
  community.docker.docker_host_info:
    images: true
  register: result

- name: Get info on docker host and list images matching the filter
  community.docker.docker_host_info:
    images: true
    images_filters:
      label: "mylabel"
  register: result

- name: Get info on docker host and verbose list images
  community.docker.docker_host_info:
    images: true
    verbose_output: true
  register: result

- name: Get info on docker host and used disk space
  community.docker.docker_host_info:
    disk_usage: true
  register: result

- name: Get info on docker host and list containers matching the filter
  community.docker.docker_host_info:
    containers: true
    containers_filters:
      label:
        - key1=value1
        - key2=value2
  register: result

- ansible.builtin.debug:
    var: result.host_info

Return Values

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

Key

Description

can_talk_to_docker

boolean

Will be true if the module can talk to the docker daemon.

Returned: both on success and on error

containers

list / elements=dictionary

List of dict objects containing the basic information about each container. Keys matches the docker container ls output unless verbose_output=true. See description for verbose_output.

Returned: When containers is true

disk_usage

dictionary

Information on summary disk usage by images, containers and volumes on docker host unless verbose_output=true. See description for verbose_output.

Returned: When disk_usage is true

host_info

dictionary

Facts representing the basic state of the docker host. Matches the docker system info output.

Returned: always

images

list / elements=dictionary

List of dict objects containing the basic information about each image. Keys matches the docker image ls output unless verbose_output=true. See description for verbose_output.

Returned: When images is true

networks

list / elements=dictionary

List of dict objects containing the basic information about each network. Keys matches the docker network ls output unless verbose_output=true. See description for verbose_output.

Returned: When networks is true

volumes

list / elements=dictionary

List of dict objects containing the basic information about each volume. Keys matches the docker volume ls output unless verbose_output=true. See description for verbose_output.

Returned: When volumes is true

Authors

  • Piotr Wojciechowski (@WojciechowskiPiotr)