iiab/roles/0-init/tasks/hostname.yml

- name: Does /etc/cloud/cloud.cfg exist i.e. is this ubuntu-18 server?
  stat:
    path: /etc/cloud/cloud.cfg
  register: U18_server

- name: 'Put "preserve_hostname: true" in /etc/cloud/cloud.cfg (ubuntu-18 server)'
  lineinfile:
    path: /etc/cloud/cloud.cfg
    regexp: '^preserve_hostname*'
    line: 'preserve_hostname: true'
    state: present
  when: U18_server is defined and U18_server.stat.exists

- name: 'Turn the crank for systemd: hostnamectl set-hostname "{{ iiab_hostname }}.{{ iiab_domain }}" (debuntu)'
  shell: hostnamectl set-hostname "{{ iiab_hostname }}.{{ iiab_domain }}"
  when: is_debuntu

- name: Install /etc/sysconfig/network from template (redhat)
  template:
    src: roles/network/templates/network/sysconfig.network.j2
    dest: /etc/sysconfig/network
    owner: root
    group: root
    mode: 0644
  when: is_redhat

- name: Put hostnames "127.0.0.1 localhost.localdomain localhost box {{ iiab_hostname }}" in /etc/hosts
  lineinfile:
    path: /etc/hosts
    regexp: '^127\.0\.0\.1'
    line: '127.0.0.1            localhost.localdomain   localhost  box {{ iiab_hostname }}'
    owner: root
    group: root
    mode: 0644

#- name: Re-configuring httpd - not initial install
#  include_tasks: roles/httpd/tasks/main.yml
#  when: iiab_stage|int > 3

#- name: Re-configuring rest of networking - not initial install
#  include_tasks: roles/network/tasks/main.yml
#  when: iiab_stage|int > 4