hostname.yaml

- hosts: all
  gather_facts: true

  tasks:
  - name: Change the hostname
    hostname:
      name: "{{ inventory_hostname }}"

  - name: Add the inventory into /etc/hosts
    # Courtesy of rwngallego on Github
    lineinfile:
      dest: /etc/hosts
      regexp: '.*{{ item }}$'
      line: "{{ hostvars[item]['ansible_default_ipv4']['address'] }} {{item}}"
      state: present
    when: hostvars[item]['ansible_facts']['default_ipv4'] is defined
    with_items:
      - "{{ groups['all'] }}"