kubespray/roles/kubernetes/master/tasks/gen_kube_tokens.yml

---
- name: tokens | generate tokens for master components
  command: "{{ kube_script_dir }}/kube-gen-token.sh {{ item[0] }}-{{ item[1] }}"
  environment:
    TOKEN_DIR: "{{ kube_token_dir }}"
  with_nested:
    - [ "system:kubectl" ]
    - "{{ groups['kube-master'] }}"
  register: gentoken_master
  changed_when: "'Added' in gentoken_master.stdout"
  when: inventory_hostname == groups['kube-master'][0]
  notify: restart kube-apiserver

- name: tokens | generate tokens for node components
  command: "{{ kube_script_dir }}/kube-gen-token.sh {{ item[0] }}-{{ item[1] }}"
  environment:
    TOKEN_DIR: "{{ kube_token_dir }}"
  with_nested:
    - [ 'system:kubelet' ]
    - "{{ groups['kube-node'] }}"
  register: gentoken_node
  changed_when: "'Added' in gentoken_node.stdout"
  when: inventory_hostname == groups['kube-master'][0]
  notify: restart kube-apiserver