vn-ansible/roles/debian-base/tasks/witness.yml

- name: Check if witness have been generated
  stat:
    path: /etc/vn.witness
  register: keys_generated_marker
- name: Generate variable if not exists
  set_fact:
    vn_first_time: "{{ not keys_generated_marker.stat.exists }}"
- name: Create marker file to indicate vn happends
  file:
    path: /etc/vn.witness
    state: touch
  when: vn_first_time