# Ansible Role: Docker

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An Ansible Role that installs [Docker](https://www.docker.com) on Linux.

## Requirements

None.

## Role Variables

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

```yaml
# 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).

```yaml
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](https://docs.docker.com/engine/install/debian/#uninstall-old-versions) for an up-to-date list of old packages that should be removed.

```yaml
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`.

```yaml
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.

```yaml
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.

```yaml
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.

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

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

```yaml
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.

```yaml
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.

```yaml
docker_users:
  - user1
  - user2
```

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

```yaml
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:

```yaml
- hosts: all

  vars:
    pip_install_packages:
      - name: docker

  roles:
    - geerlingguy.pip
    - geerlingguy.docker
```

## Dependencies

None.

## Example Playbook

```yaml
- hosts: all
  roles:
    - geerlingguy.docker
```

## License

MIT / BSD

## Sponsors

* [We Manage](https://we-manage.de): Helping start-ups and grown-ups scaling their infrastructure in a sustainable way.

The above sponsor(s) are supporting Jeff Geerling on [GitHub Sponsors](https://github.com/sponsors/geerlingguy). You can sponsor Jeff's work too, to help him continue improving these Ansible open source projects!

## Author Information

This role was created in 2017 by [Jeff Geerling](https://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/).