configure-HA.yml

---
- name: Enumerate all cluster hosts within the hosts file
  ansible.builtin.blockinfile:
    dest: /etc/hosts
    marker: "# {mark} ANSIBLE MANAGED: microk8s HA Cluster Hosts"
    # yamllint disable rule:line-length
    content: |
      {% for host in groups[microk8s_group_ha] %}
      {{ hostvars[host].ansible_default_ipv4.address }} {{ hostvars[host].ansible_hostname }}
      {% endfor %}
    # yamllint enable rule:line-length
  tags:
    - microk8s
    - microk8s.ha
    - microk8s.ha.hosts

- name: Find the designated host
  ansible.builtin.set_fact:
    microk8s_designated_host: '{{ (groups[microk8s_group_ha]|sort)[0] }}'
  tags:
    - always
    - microk8s
    - microk8s.ha

- block:
    - name: Waiting for microk8s to be ready on microk8s host master
      ansible.builtin.command:
        cmd: microk8s status --wait-ready
      delegate_to: "{{ microk8s_designated_host }}"
      delegate_facts: true
      changed_when: false

    - name: Get the microk8s join command from the microk8s master
      ansible.builtin.shell:
        cmd: >-
          microk8s add-node |
          grep -E -m1 'microk8s join {{ microk8s_ip_regex_ha }}'
      delegate_to: "{{ microk8s_designated_host }}"
      delegate_facts: true
      changed_when: false
      register: microk8s_join_command

    - name: Get microk8s cluster nodes
      ansible.builtin.command:
        cmd: kubectl get nodes --no-headers -o custom-columns=:.metadata.name
      delegate_to: "{{ microk8s_designated_host }}"
      delegate_facts: true
      changed_when: false
      register: microk8s_cluster_node

    - name: Waiting for microk8s to be ready on microk8s host node
      ansible.builtin.command:
        cmd: microk8s status --wait-ready
      changed_when: false

    - name: Set the microk8s join command on the microk8s node
      ansible.builtin.command:
        cmd: "{{ microk8s_join_command.stdout }} --skip-verify"
      when:
        - inventory_hostname not in microk8s_cluster_node.stdout

  when: inventory_hostname != microk8s_designated_host
  tags:
    - microk8s
    - microk8s.ha
    - microk8s.ha.join
...