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

---
- name: restart docker
  command: /bin/true
  notify:
    - Docker | reload systemd
    - Docker | reload docker.socket
    - Docker | reload docker
    - Docker | wait for docker

- name: Docker | reload systemd
  systemd:
    daemon_reload: true

- name: Docker | reload docker.socket
  service:
    name: docker.socket
    state: restarted
  when: ansible_os_family in ['CoreOS', 'Container Linux by CoreOS']

- name: Docker | reload docker
  service:
    name: docker
    state: restarted

- name: Docker | wait for docker
  command: "{{ docker_bin_dir }}/docker images"
  register: docker_ready
  retries: 20
  delay: 1
  until: docker_ready.rc == 0