kubespray/roles/docker/tasks/main.yml

---
- name: gather os specific variables
  include_vars: "{{ item }}"
  with_first_found:
    - files:
        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_version|lower|replace('/', '_') }}.yml"
        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_release }}.yml"
        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version|lower|replace('/', '_') }}.yml"
        - "{{ ansible_distribution|lower }}.yml"
        - "{{ ansible_os_family|lower }}.yml"
        - defaults.yml
      paths:
        - ../vars
      skip: true
  tags: facts

- include: set_facts_dns.yml
  when: dns_mode != 'none' and resolvconf_mode == 'docker_dns'
  tags: facts

- name: check for minimum kernel version
  fail:
    msg: >
          docker requires a minimum kernel version of
          {{ docker_kernel_min_version }} on
          {{ ansible_distribution }}-{{ ansible_distribution_version }}
  when: (not ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]) and (ansible_kernel|version_compare(docker_kernel_min_version, "<"))
  tags: facts

- name: ensure docker repository public key is installed
  action: "{{ docker_repo_key_info.pkg_key }}"
  args:
    id: "{{item}}"
    keyserver: "{{docker_repo_key_info.keyserver}}"
    state: present
  register: keyserver_task_result
  until: keyserver_task_result|succeeded
  retries: 4
  delay: "{{ retry_stagger | random + 3 }}"
  with_items: "{{ docker_repo_key_info.repo_keys }}"
  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] or is_atomic)

- name: ensure docker repository is enabled
  action: "{{ docker_repo_info.pkg_repo }}"
  args:
    repo: "{{item}}"
    state: present
  with_items: "{{ docker_repo_info.repos }}"
  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] or is_atomic) and (docker_repo_info.repos|length > 0)

- name: Configure docker repository on RedHat/CentOS
  template:
    src: "rh_docker.repo.j2"
    dest: "/etc/yum.repos.d/docker.repo"
  when: ansible_distribution in ["CentOS","RedHat"] and not is_atomic

- name: ensure docker packages are installed
  action: "{{ docker_package_info.pkg_mgr }}"
  args:
    pkg: "{{item.name}}"
    force: "{{item.force|default(omit)}}"
    state: present
  register: docker_task_result
  until: docker_task_result|succeeded
  retries: 4
  delay: "{{ retry_stagger | random + 3 }}"
  with_items: "{{ docker_package_info.pkgs }}"
  notify: restart docker
  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] or is_atomic) and (docker_package_info.pkgs|length > 0)

- name: check minimum docker version for docker_dns mode. You need at least docker version >= 1.12 for resolvconf_mode=docker_dns
  command: "docker version -f '{{ '{{' }}.Client.Version{{ '}}' }}'"
  register: docker_version
  failed_when: docker_version.stdout|version_compare('1.12', '<')
  changed_when: false
  when: dns_mode != 'none' and resolvconf_mode == 'docker_dns'

- name: Set docker systemd config
  include: systemd.yml

- name: ensure docker service is started and enabled
  service:
    name: "{{ item }}"
    enabled: yes
    state: started
  with_items:
    - docker