ansible-role-docker/tasks/docker_setup.yml

---
- name: Docker configuration and service management
  block:
    - name: Install the Docker default options
      template: src=docker-default.j2 dest={{ docker_defaults_file }} owner=root group=root mode=0644
      when: ansible_service_mgr != 'systemd'
      notify: Restart docker
      tags: ['docker', 'docker_conf']

    - name: Install the Docker daemon config
      template: src=daemon.json.j2 dest=/etc/docker/daemon.json owner=root group=root mode=0644
      notify: Restart docker
      tags: ['docker', 'docker_conf']

    - name: Create the docker service systemd directory
      file: dest=/etc/systemd/system/docker.service.d state=directory mode=0755
      when: ansible_service_mgr == 'systemd'
      tags: ['docker', 'docker_systemd', 'docker_conf']

    - name: Install the Docker additional systemd unit
      template:
        src: docker-systemd-override.conf.j2
        dest: /etc/systemd/system/docker.service.d/override.conf
        owner: root
        group: root
        mode: 0644
      when: ansible_service_mgr == 'systemd'
      notify: Restart docker
      register: reload_systemd
      tags: ['docker', 'docker_systemd', 'docker_conf']

    - name: systemd reload
      command: systemctl daemon-reload
      when: reload_systemd is defined and reload_systemd is changed
      tags: ['docker', 'docker_systemd', 'docker_conf']

    - name: Ensure that the service is started and enabled
      service: name=docker state=started enabled=yes

  when: docker_install
  tags: [docker]

- name: Cron job that prunes the dangling images
  block:
    - name: Install a script that prunes the docker dangling images
      copy:
        src: docker-prune-dangling-images.sh
        dest: /usr/local/sbin/docker-prune-dangling-images
        owner: root
        group: root
        mode: 0744

    - name: Install a cron job that prunes the docker images
      cron:
        name: Prune docker images
        cron_file: docker-prune-images
        special_time: daily
        user: root
        state: present
        job: "/usr/local/sbin/docker-prune-dangling-images"
      when: docker_prune_dangling_images

    - name: Disable the cron job that prunes the docker images
      cron:
        name: Prune docker images
        cron_file: docker-prune-images
        special_time: daily
        user: root
        state: absent
        job: "/usr/local/sbin/docker-prune-dangling-images"
      when: not docker_prune_dangling_images

  when: docker_install
  tags: [docker, docker_prune_images]

- block:
    - name: Remove the docker user
      user: name=docker state=absent

  when: not docker_install
  tags: [docker]