---

- name: Use hostname module to set hostname, or failback to command module
  block:
    - name: Set hostname for host using hostname module
      ansible.builtin.hostname:
        name: "{{ inventory_hostname }}"
      notify:
        - "Restart_syslog_{{ ansible_distribution | lower }}_{{ ansible_distribution_major_version }}"

  rescue:
    - name: Ensure hostname package is present
      ansible.builtin.package:
        name: hostname
        state: present

    - name: Set hostname file if running in container
      ansible.builtin.set_fact:
        hostname_hostname_file: "{{ hostname_hostname_file }}.container"
      when:
        - ansible_virtualization_type | regex_search("docker|podman|container")

    - name: Add entry into hostname file
      ansible.builtin.lineinfile:
        path: "{{ hostname_hostname_file }}"
        line: "{{ inventory_hostname }}"
        state: present
        create: true
        mode: '0644'

    - name: Update hostname from /etc/hostname
      ansible.builtin.command:
        cmd: "hostname -F {{ hostname_hostname_file }}"
      notify:
        - "Restart_syslog_{{ ansible_distribution | lower }}_{{ ansible_distribution_major_version }}"
      when:
        - not ansible_virtualization_type | regex_search("docker|podman|container")


...