kubespray/roles/network_plugin/tasks/main.yml

---
- name: "Test if network plugin is defined"
  fail: msg="ERROR, One network_plugin variable must be defined (Flannel or Calico)"
  when: ( kube_network_plugin is defined and kube_network_plugin == "calico" and kube_network_plugin == "flannel" ) or
        kube_network_plugin is not defined

- include: flannel.yml
  when: kube_network_plugin == "flannel"

- name: Set docker daemon options
  template:
    src: docker
    dest: "{{ '/etc/sysconfig/docker-network' if ansible_os_family == 'RedHat' else '/etc/default/docker' }}"
    owner: root
    group: root
    mode: 0644
  notify:
    - restart docker

- name: Write docker.service systemd file
  template:
    src: systemd-docker.service
    dest: /lib/systemd/system/docker.service
  notify: restart docker
  when: init_system == "systemd"

- meta: flush_handlers

- include: calico.yml
  when: kube_network_plugin == "calico"