docker/tasks/main.yml

---

- name: Install apt-key
  apt_key:
    id: 0EBFCD88
    keyserver: keyserver.ubuntu.com

- name: Ensure https transport to be available
  apt:
    name: apt-transport-https

- name: Activate apt-repo
  apt_repository:
    repo: 'deb https://download.docker.com/linux/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} stable'
    state: present

- name: Install docker
  apt:
    name: docker-ce
    update_cache: yes

- set_fact:
    docker_global_ipv6: "{{ ansible_eth0.ipv6 | selectattr('scope', 'equalto', 'global') | first }}"
  when: docker_configure_ipv6 and ansible_eth0 and ansible_eth0.ipv6 | selectattr('scope', 'equalto', 'global') | list | length > 0

- set_fact:
    docker_ipv6_subnet: "{{ docker_global_ipv6.address | ipsubnet(docker_global_ipv6.prefix) | ipsubnet(80, -1) }}"
  when: docker_global_ipv6 is defined

- name: Create docker drop-in directory
  file:
    dest: /etc/systemd/system/docker.service.d
    state: directory

- name: Configure docker start options
  template:
    src: docker-startopts.conf
    dest: /etc/systemd/system/docker.service.d/docker-startopts.conf
  register: docker_startopts

- name: Restart docker to apply new config
  systemd:
    name: docker.service
    state: restarted
    daemon_reload: yes
  when: docker_startopts.changed

- name: Create docker configuration dir
  file:
    dest: '{{ docker_auth_config_homedir }}/.docker'
    mode: 0700
    owner: '{{ docker_auth_config_user }}'
    state: directory
  when: docker_auth_config is defined

- name: Enable authentication for private registries
  copy:
    content: '{{ docker_auth_config | to_nice_json }}'
    dest: '{{ docker_auth_config_homedir }}/.docker/config.json'
    mode: 0600
    owner: '{{ docker_auth_config_user }}'
  when: docker_auth_config is defined

...