okd/roles/openshift_openstack/tasks/hostname.yml

---
- name: Setting Hostname Fact
  set_fact:
    new_hostname: "{{ custom_hostname | default(inventory_hostname_short) }}"

- name: Setting FQDN Fact
  set_fact:
    new_fqdn: "{{ new_hostname }}.{{ openshift_openstack_full_dns_domain }}"

- name: Setting hostname and DNS domain
  hostname: name="{{ new_fqdn }}"

- name: Check for cloud.cfg
  stat: path=/etc/cloud/cloud.cfg
  register: cloud_cfg

- name: Prevent cloud-init updates of hostname/fqdn (if applicable)
  lineinfile:
    dest: /etc/cloud/cloud.cfg
    state: present
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  with_items:
  - { regexp: '^ - set_hostname', line: '# - set_hostname' }
  - { regexp: '^ - update_hostname', line: '# - update_hostname' }
  when: cloud_cfg.stat.exists == True