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Ansible Role: Docker

An Ansible Role that installs Docker on Linux.

Requirements

None.

Role Variables

Available variables are listed below, along with default values (see defaults/main.yml):

# Edition can be one of: 'ce' (Community Edition) or 'ee' (Enterprise Edition).
docker_edition: 'ce'
docker_packages:
    - "docker-{{ docker_edition }}"
    - "docker-{{ docker_edition }}-cli"
    - "docker-{{ docker_edition }}-rootless-extras"
docker_packages_state: present

The docker_edition should be either ce (Community Edition) or ee (Enterprise Edition). You can also specify a specific version of Docker to install using the distribution-specific format: Red Hat/CentOS: docker-{{ docker_edition }}-<VERSION> (Note: you have to add this to all packages); Debian/Ubuntu: docker-{{ docker_edition }}=<VERSION> (Note: you have to add this to all packages).

You can control whether the package is installed, uninstalled, or at the latest version by setting docker_packages_state to present, absent, or latest, respectively. Note that the Docker daemon will be automatically restarted if the Docker package is updated. This is a side effect of flushing all handlers (running any of the handlers that have been notified by this and any other role up to this point in the play).

docker_obsolete_packages:
  - docker
  - docker.io
  - docker-engine
  - docker-doc
  - podman-docker
  - containerd
  - runc

A list of packages to be uninstalled prior to running this role. See Docker's installation instructions for an up-to-date list of old packages that should be removed.

docker_service_manage: true
docker_service_state: started
docker_service_enabled: true
docker_restart_handler_state: restarted

Variables to control the state of the docker service, and whether it should start on boot. If you're installing Docker inside a Docker container without systemd or sysvinit, you should set docker_service_manage to false.

docker_install_compose_plugin: true
docker_compose_package: docker-compose-plugin
docker_compose_package_state: present

Docker Compose Plugin installation options. These differ from the below in that docker-compose is installed as a docker plugin (and used with docker compose) instead of a standalone binary.

docker_install_compose: false
docker_compose_version: "2.29.2"
docker_compose_arch: "{{ ansible_architecture }}"
docker_compose_url: "https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-linux-{{ docker_compose_arch }}"
docker_compose_path: /usr/local/bin/docker-compose

Docker Compose installation options.

docker_add_repo: true

Controls whether this role will add the official Docker repository. Set to false if you want to use the default docker packages for your system or manage the package repository on your own.

docker_repo_url: https://download.docker.com/linux

The main Docker repo URL, common between Debian and RHEL systems.

docker_apt_release_channel: stable
docker_apt_arch: "{{ 'arm64' if ansible_architecture == 'aarch64' else 'amd64' }}"
docker_apt_repository: "deb [arch={{ docker_apt_arch }}] {{ docker_repo_url }}/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} {{ docker_apt_release_channel }}"
docker_apt_ignore_key_error: True
docker_apt_gpg_key: "{{ docker_repo_url }}/{{ ansible_distribution | lower }}/gpg"
docker_apt_filename: "docker"

(Used only for Debian/Ubuntu.) You can switch the channel to nightly if you want to use the Nightly release.

You can change docker_apt_gpg_key to a different url if you are behind a firewall or provide a trustworthy mirror. Usually in combination with changing docker_apt_repository as well. docker_apt_filename controls the name of the source list file created in sources.list.d. If you are upgrading from an older (<7.0.0) version of this role, you should change this to the name of the existing file (e.g. download_docker_com_linux_debian on Debian) to avoid conflicting lists.

docker_yum_repo_url: "{{ docker_repo_url }}/{{ (ansible_distribution == 'Fedora') | ternary('fedora','centos') }}/docker-{{ docker_edition }}.repo"
docker_yum_repo_enable_nightly: '0'
docker_yum_repo_enable_test: '0'
docker_yum_gpg_key: "{{ docker_repo_url }}/centos/gpg"

(Used only for RedHat/CentOS.) You can enable the Nightly or Test repo by setting the respective vars to 1.

You can change docker_yum_gpg_key to a different url if you are behind a firewall or provide a trustworthy mirror. Usually in combination with changing docker_yum_repository as well.

docker_users:
  - user1
  - user2

A list of system users to be added to the docker group (so they can use Docker on the server).

docker_daemon_options:
  storage-driver: "overlay2"
  log-opts:
    max-size: "100m"

Custom dockerd options can be configured through this dictionary representing the json file /etc/docker/daemon.json.

Use with Ansible (and `docker` Python library)

Many users of this role wish to also use Ansible to then build Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the docker Python library using the geerlingguy.pip role:

- hosts: all

  vars:
    pip_install_packages:
      - name: docker

  roles:
    - geerlingguy.pip
    - geerlingguy.docker

Dependencies

None.

Example Playbook

- hosts: all
  roles:
    - geerlingguy.docker

License

MIT / BSD

Author Information

This role was created in 2017 by Jeff Geerling, author of Ansible for DevOps.

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