---
################################################################################
# Join nodes to cluster.
# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#join-nodes 
################################################################################

- name: Get the kubeadm join command from the Kubernetes master.
  command: kubeadm token create --print-join-command
  changed_when: false
  when: kubernetes_role == 'master'
  register: kubernetes_join_command_result

- name: Set the kubeadm join command globally.
  set_fact:
    kubernetes_join_command: "{{ kubernetes_join_command_result.stdout }}"
  when: kubernetes_join_command_result.stdout is defined
  delegate_to: "{{ item }}"
  delegate_facts: true
  with_items: "{{ groups['all'] }}"

- name: Join node to cluster.
  command:
    cmd: "{{ kubernetes_join_command }}"
    creates: /etc/kubernetes/kubelet.conf
  become: true
  when: kubernetes_role == 'worker'