ansible/roles/kubernetes/node/tasks/main.yml

---
- name: Join the cluster
  block:
    - name: Set cluster endpoint record
      become: true
      ansible.builtin.lineinfile:
        path: /etc/hosts
        state: present
        regexp: '^\d+\.\d+\.\d+\.\d+\ .*-cluster-endpoint$'
        line: "{{ control_plane_endpoint }} {{ cluster_name }}-cluster-endpoint"

    - name: Obtain join command from control_plane
      ansible.builtin.command: "kubeadm token create --print-join-command"
      when: inventory_hostname != "control_plane"
      register: join_cmd
      delegate_to: "{{ item }}"
      delegate_facts: true
      with_items: ["control_plane"]

    - name: Execute join command
      become: true
      ansible.builtin.command: "{{ join_cmd.results[0].stdout }}"