kubespray/roles/container-engine/docker/tasks/main.yml

---
- name: check if atomic host
  stat:
    path: /run/ostree-booted
  register: ostree

- set_fact:
    is_atomic: "{{ ostree.stat.exists }}"

- 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|lower }}-{{ host_architecture }}.yml"
        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_release|lower }}.yml"
        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version|lower|replace('/', '_') }}.yml"
        - "{{ ansible_distribution|lower }}-{{ host_architecture }}.yml"
        - "{{ ansible_distribution|lower }}.yml"
        - "{{ ansible_os_family|lower }}-{{ host_architecture }}.yml"
        - "{{ ansible_os_family|lower }}.yml"
        - defaults.yml
      paths:
        - ../vars
      skip: true
  tags:
    - facts

# https://yum.dockerproject.org/repo/main/opensuse/ contains packages for an EOL
# openSUSE version so we can't use it. The only alternative is to use the docker
# packages from the distribution repositories.
- name: Warn about Docker version on SUSE
  debug:
    msg: "SUSE distributions always install Docker from the distro repos"
  when: ansible_pkg_mgr == 'zypper'

- include_tasks: 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", "ClearLinux"]) and (ansible_kernel is version(docker_kernel_min_version, "<"))
  tags:
    - facts

- import_tasks: pre-upgrade.yml

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

- name: ensure docker-ce 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", "RedHat", "Suse", "ClearLinux"] or is_atomic) and (docker_repo_info.repos|length > 0)

- name: ensure docker-engine repository public key is installed
  action: "{{ dockerproject_repo_key_info.pkg_key }}"
  args:
    id: "{{item}}"
    url: "{{dockerproject_repo_key_info.url}}"
    state: present
  register: keyserver_task_result
  until: keyserver_task_result is succeeded
  retries: 4
  delay: "{{ retry_stagger | d(3) }}"
  with_items: "{{ dockerproject_repo_key_info.repo_keys }}"
  when:
    - not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat", "Suse", "ClearLinux"] or is_atomic)
    - use_docker_engine is defined and use_docker_engine

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

- name: Configure docker repository on Fedora
  template:
    src: "fedora_docker.repo.j2"
    dest: "{{ yum_repo_dir }}/docker.repo"
  when: ansible_distribution == "Fedora" and not is_atomic

- name: Configure docker repository on RedHat/CentOS
  template:
    src: "rh_docker.repo.j2"
    dest: "{{ yum_repo_dir }}/docker.repo"
  when: ansible_distribution in ["CentOS","RedHat"] and not is_atomic

- name: check if container-selinux is available
  yum:
    list: "container-selinux"
  register: yum_result
  when: ansible_distribution in ["CentOS","RedHat"] and not is_atomic

- name: Configure extras repository on RedHat/CentOS if container-selinux not avaiable in current repos
  yum_repository:
    name: extras
    description: "CentOS-7 - Extras"
    state: present
    baseurl: "{{ extras_rh_repo_base_url }}"
    file: "extras"
    gpgcheck: yes
    gpgkey: "{{extras_rh_repo_gpgkey}}"
    keepcache: "{{ docker_rpm_keepcache | default('1') }}"
    proxy: " {{ http_proxy | default(omit) }}"
  when:
    - ansible_distribution in ["CentOS","RedHat"] and not is_atomic
    - yum_result.results | length == 0

- name: Copy yum.conf for editing
  copy:
    src: "{{ yum_conf }}"
    dest: "{{ docker_yum_conf }}"
    remote_src: yes
  when: ansible_distribution in ["CentOS","RedHat"] and not is_atomic

- name: Edit copy of yum.conf to set obsoletes=0
  lineinfile:
    path: "{{ docker_yum_conf }}"
    state: present
    regexp: '^obsoletes='
    line: 'obsoletes=0'
  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)}}"
    conf_file: "{{item.yum_conf|default(omit)}}"
    state: present
    update_cache: "{{ omit if ansible_distribution == 'Fedora' else True }}"
  register: docker_task_result
  until: docker_task_result is succeeded
  retries: 4
  delay: "{{ retry_stagger | d(3) }}"
  with_items: "{{ docker_package_info.pkgs }}"
  notify: restart docker
  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "ClearLinux"] or is_atomic) and (docker_package_info.pkgs|length > 0)
  ignore_errors: true

- name: Ensure docker packages are installed
  action: "{{ docker_package_info.pkg_mgr }}"
  args:
    name: "{{ item.name }}"
    state: present
  with_items: "{{ docker_package_info.pkgs }}"
  register: docker_task_result
  until: docker_task_result is succeeded
  retries: 4
  delay: "{{ retry_stagger | d(3) }}"
  notify: restart docker
  ignore_errors: true
  when: ansible_os_family in ["ClearLinux"]

- name: get available packages on Ubuntu
  command: apt-cache policy docker-ce
  when:
    - docker_task_result is failed
    - ansible_distribution == 'Ubuntu'
  register: available_packages

- name: show available packages on ubuntu
  fail:
    msg: "{{available_packages}}"
  when:
    - docker_task_result is failed
    - ansible_distribution == 'Ubuntu'

# This is required to ensure any apt upgrade will not break kubernetes
- name: Set docker pin priority to apt_preferences on Debian family
  template:
    src: "apt_preferences.d/debian_docker.j2"
    dest: "/etc/apt/preferences.d/docker"
    owner: "root"
    mode: 0644
  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "ClearLinux", "RedHat", "Suse"] or is_atomic)

- name: ensure service is started if docker packages are already present
  service:
    name: docker
    state: started
  when: docker_task_result is not changed

- name: flush handlers so we can wait for docker to come up
  meta: flush_handlers

- name: set fact for docker_version
  command: "docker version -f '{{ '{{' }}.Client.Version{{ '}}' }}'"
  register: installed_docker_version
  changed_when: false

- name: check minimum docker version for docker_dns mode. You need at least docker version >= 1.12 for resolvconf_mode=docker_dns
  fail:
    msg: "You need at least docker version >= 1.12 for resolvconf_mode=docker_dns"
  when: >
        dns_mode != 'none' and
        resolvconf_mode == 'docker_dns' and
        installed_docker_version.stdout is version('1.12', '<')

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

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