- name: set hostname
  ansible.builtin.hostname:
    name: "{{ main_linux_srv01_hostname }}.{{ main_domain_name }}"

- name: update /etc/hosts
  ansible.builtin.replace:
    path: /etc/hosts
    regexp: "ubuntu"
    replace: "{{ main_linux_srv01_hostname }}.{{ main_domain_name }} {{ main_linux_srv01_hostname }}"