geerlingguy.ansible-role-docker/tasks/main.yml

---
- name: Load OS-specific vars.
  include_vars: "{{ lookup('first_found', params) }}"
  vars:
    params:
      files:
        - '{{ansible_facts.distribution}}.yml'
        - '{{ansible_facts.os_family}}.yml'
        - main.yml
      paths:
        - 'vars'

- include_tasks: setup-RedHat.yml
  when: ansible_facts.os_family == 'RedHat'

- include_tasks: setup-Debian.yml
  when: ansible_facts.os_family == 'Debian'

- name: Install Docker packages.
  package:
    name: "{{ docker_packages }}"
    state: "{{ docker_packages_state }}"
  notify: restart docker
  ignore_errors: "{{ ansible_check_mode }}"
  when: "ansible_version.full is version_compare('2.12', '<') or ansible_facts.os_family not in ['RedHat', 'Debian']"

- name: Install Docker packages (with downgrade option).
  package:
    name: "{{ docker_packages }}"
    state: "{{ docker_packages_state }}"
    allow_downgrade: true
  notify: restart docker
  ignore_errors: "{{ ansible_check_mode }}"
  when: "ansible_version.full is version_compare('2.12', '>=') and ansible_facts.os_family in ['RedHat', 'Debian']"

- name: Install docker-compose plugin.
  package:
    name: "{{ docker_compose_package }}"
    state: "{{ docker_compose_package_state }}"
  notify: restart docker
  ignore_errors: "{{ ansible_check_mode }}"
  when: "docker_install_compose_plugin | bool == true and (ansible_version.full is version_compare('2.12', '<') or ansible_facts.os_family not in ['RedHat', 'Debian'])"

- name: Install docker-compose-plugin (with downgrade option).
  package:
    name: "{{ docker_compose_package }}"
    state: "{{ docker_compose_package_state }}"
    allow_downgrade: true
  notify: restart docker
  ignore_errors: "{{ ansible_check_mode }}"
  when: "docker_install_compose_plugin | bool == true and ansible_version.full is version_compare('2.12', '>=') and ansible_facts.os_family in ['RedHat', 'Debian']"

- name: Ensure /etc/docker/ directory exists.
  file:
    path: /etc/docker
    state: directory
    mode: 0755
  when: docker_daemon_options.keys() | length > 0

- name: Configure Docker daemon options.
  copy:
    content: "{{ docker_daemon_options | to_nice_json }}"
    dest: /etc/docker/daemon.json
    mode: 0644
  when: docker_daemon_options.keys() | length > 0
  notify: restart docker

- name: Ensure Docker is started and enabled at boot.
  service:
    name: docker
    state: "{{ docker_service_state }}"
    enabled: "{{ docker_service_enabled }}"
  ignore_errors: "{{ ansible_check_mode }}"
  when: docker_service_manage | bool

- name: Ensure handlers are notified now to avoid firewall conflicts.
  meta: flush_handlers

- include_tasks: docker-compose.yml
  when: docker_install_compose | bool

- name: Get docker group info using getent.
  getent:
    database: group
    key: docker
    split: ':'
  when: docker_users | length > 0

- name: Check if there are any users to add to the docker group.
  set_fact:
    at_least_one_user_to_modify: true
  when:
    - docker_users | length > 0
    - item not in ansible_facts.getent_group["docker"][2]
  with_items: "{{ docker_users }}"

- include_tasks: docker-users.yml
  when: at_least_one_user_to_modify is defined