- name: Generate join token on the master node
  command: kubeadm token create --print-join-command
  register: join_command
  delegate_to: "{{ groups['master'][0] }}"
  run_once: true
  changed_when: false

- name: Set join token as a fact
  set_fact:
    join_token: "{{ join_command.stdout }}"
  run_once: true

- name: Check if node is already joined
  command: kubectl get nodes
  register: kubectl_nodes
  ignore_errors: yes
  changed_when: false
  delegate_to: "{{ groups['master'][0] }}"
  run_once: true

- name: Join worker node to the cluster
  command: "{{ join_token }}"
  when: >
    join_token is defined and
    inventory_hostname not in kubectl_nodes.stdout