- name: Check if DNS is already configured
  stat:
    path: /etc/resolv.conf
  register: resolv_conf
- name: Read /etc/resolv.conf
  slurp:
    path: /etc/resolv.conf
  register: resolv_conf_content
  when: resolv_conf.stat.exists
- name: Check if DNS servers are already present
  set_fact:
    dns_configured: "{{ resolv_conf_content['content'] | b64decode | regex_search('^nameserver') is not none }}"
  when: resolv_conf.stat.exists
- name: Apply resolv.conf template only if DNS is not configured
  template:
    src: templates/resolv.conf
    dest: /etc/resolv.conf
    owner: root
    group: root
    mode: u=rw,g=r,o=r
    backup: true
  when: not resolv_conf.stat.exists or not dns_configured