kubespray/roles/kubernetes/preinstall/handlers/main.yml

- name: Preinstall | restart network
  command: /bin/true
  notify:
    - Preinstall | reload network
    - Preinstall | reload kubelet
    - Preinstall | kube-controller configured
    - Preinstall | stop controller
    - Preinstall | pause for controller
    - Preinstall | restart controller
  when: not ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]

  # FIXME(bogdando) https://github.com/projectcalico/felix/issues/1185
- name: Preinstall | reload network
  service:
    name: >-
      {% if ansible_os_family == "RedHat" -%}
      network
      {%- elif ansible_os_family == "Debian" -%}
      networking
      {%- endif %}
    state: restarted
  when: not ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] and kube_network_plugin not in ['canal', 'calico']

- name: Preinstall | update resolvconf for Container Linux by CoreOS
  command: /bin/true
  notify:
    - Preinstall | apply resolvconf cloud-init
    - Preinstall | reload kubelet
  when: ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]

- name: Preinstall | apply resolvconf cloud-init
  command: /usr/bin/coreos-cloudinit --from-file {{ resolveconf_cloud_init_conf }}
  when: ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]

- name: Preinstall | reload kubelet
  service:
    name: kubelet
    state: restarted
  notify:
    - Preinstall | kube-controller configured
    - Preinstall | stop controller
    - Preinstall | pause for controller
    - Preinstall | restart controller
  when: not dns_early|bool

- name: Preinstall | kube-controller configured
  stat: path="{{ kube_manifest_dir }}/kube-controller-manager.manifest"
  register: kube_controller_set
  when: inventory_hostname in groups['kube-master'] and dns_mode != 'none' and resolvconf_mode == 'host_resolvconf'

- name: Preinstall | stop controller
  replace:
    dest: "{{ kube_manifest_dir }}/kube-controller-manager.manifest"
    regexp: '(\s+)image:\s+.*?$'
    replace: '\1image: kill.controller.using.fake.image.in:manifest'
  when: inventory_hostname in groups['kube-master'] and dns_mode != 'none' and resolvconf_mode == 'host_resolvconf' and kube_controller_set.stat.exists

- name: Preinstall | pause for controller
  pause: seconds=20
  when: inventory_hostname in groups['kube-master'] and dns_mode != 'none' and resolvconf_mode == 'host_resolvconf' and kube_controller_set.stat.exists

- name: Preinstall | restart controller
  replace:
    dest: "{{ kube_manifest_dir }}/kube-controller-manager.manifest"
    regexp: '(\s+)image:\s+.*?$'
    replace: '\1image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}'
  when: inventory_hostname in groups['kube-master'] and dns_mode != 'none' and resolvconf_mode == 'host_resolvconf' and kube_controller_set.stat.exists