k3s-ansible/roles/k3s_server/tasks/join_master.yml

---
- name: Verify primary Kubernetes API reachability from {{ joining_master }}
  ansible.builtin.wait_for:
    host: >-
      {{ hostvars[groups[group_name_master | default('master')][0]].k3s_node_ip
      | split(',') | first }}
    port: 6443
    connect_timeout: 2
    timeout: 30
  delegate_to: "{{ joining_master }}"

- name: Join transient k3s-init service for {{ joining_master }}
  ansible.builtin.command:
    cmd: >-
      systemd-run -p RestartSec=2 -p Restart=on-failure
      -p Delegate=yes -p TasksMax=infinity -p KillMode=process
      -p LimitNOFILE=1048576 -p LimitNPROC=infinity -p LimitCORE=infinity
      --unit=k3s-init
      k3s server {{ hostvars[joining_master].k3s_server_init_args }}
    creates: "{{ systemd_dir }}/k3s-init.service"
  delegate_to: "{{ joining_master }}"
  no_log: true

- name: Wait for primary registration of {{ joining_master }}
  ansible.builtin.command:
    cmd: >-
      {{ k3s_kubectl_binary | default('k3s kubectl') }} get node
      {{ hostvars[joining_master].ansible_hostname }}
  delegate_to: "{{ groups[group_name_master | default('master')][0] }}"
  register: joined_master
  until: joined_master.rc == 0
  retries: "{{ retry_count | default(20) }}"
  delay: 2
  changed_when: false