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# docker_host_info – Retrieves facts about docker host and lists of objects of the services

New in version 2.8.

- Synopsis

- Requirements

- Parameters

- Notes

- Examples

- Return Values

- Status

## 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- Docker SDK for Python: Please note that the docker-py Python module has been superseded by docker (see here for details).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 | 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
containers boolean | Choices: no ← yes | Whether to list containers.
containers_filters dictionary |  | A dictionary of filter values used for selecting containers to list. For example, `until: 24h`. See the docker documentation for more information on possible filters.
debug boolean | Choices: no ← yes | Debug mode
disk_usage boolean | Choices: no ← yes | Summary information on used disk space by all Docker layers. The output is a sum of images, volumes, containers and build cache.
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
images boolean | Choices: no ← yes | Whether to list images.
images_filters dictionary |  | A dictionary of filter values used for selecting images to list. For example, `dangling: true`. See the docker documentation for more information on possible filters.
networks boolean | Choices: no ← yes | Whether to list networks.
networks_filters dictionary |  | A dictionary of filter values used for selecting networks to list. 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 | 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
verbose_output boolean | Choices: no ← yes | When set to `yes` and networks, volumes, images, containers or disk_usage is set to `yes` 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 L(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.
volumes boolean | Choices: no ← yes | Whether to list volumes.
volumes_filters dictionary |  | A dictionary of filter values used for selecting volumes to list. 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 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: Get info on docker host
      docker_host_info:
      register: result

    - name: Get info on docker host and list images
      docker_host_info:
        images: yes
      register: result

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

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

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

    - debug:
        var: result.host_info

## Return Values

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

Key | Returned | Description
--- | --- | ---
can_talk_to_docker boolean | both on success and on error | Will be `true` if the module can talk to the docker daemon.
containers list / elements=dictionary | When containers is `yes` | List of dict objects containing the basic information about each container. Keys matches the `docker container ls` output unless verbose_output=yes. See description for verbose_output.
disk_usage dictionary | When disk_usage is `yes` | Information on summary disk usage by images, containers and volumes on docker host unless verbose_output=yes. See description for verbose_output.
host_info dictionary | always | Facts representing the basic state of the docker host. Matches the `docker system info` output.
images list / elements=dictionary | When images is `yes` | List of dict objects containing the basic information about each image. Keys matches the `docker image ls` output unless verbose_output=yes. See description for verbose_output.
networks list / elements=dictionary | When networks is `yes` | List of dict objects containing the basic information about each network. Keys matches the `docker network ls` output unless verbose_output=yes. See description for verbose_output.
volumes list / elements=dictionary | When volumes is `yes` | List of dict objects containing the basic information about each volume. Keys matches the `docker volume ls` output unless verbose_output=yes. See description for verbose_output.

## Status

- This module is not guaranteed to have a backwards compatible interface. [preview]

- This module is maintained by the Ansible Community. [community]

### Authors

- Piotr Wojciechowski (@WojciechowskiPiotr)

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