ansiblle-serial-reboot.yml

---
# EXAMPLE: ansible-playbook -i inventory/local-vagrant/hosts --diff reboot.yml -e reboot_hosts=utility,dev,sandbox
- hosts: "{{reboot_hosts}}"
  become: yes
  # Reboot one at a time to enable play failure if any don't come back
  serial: 1
  tasks:
    - debug:
        msg: "Rebooting {{inventory_hostname_short}}"

    # https://docs.ansible.com/ansible/latest/collections/ansible/builtin/reboot_module.html
    - name: "Reboot {{inventory_hostname_short}}"
      reboot:
        reboot_timeout: 120
      register: reboot_result
      ignore_errors: true

    - debug:
        msg: "{{reboot_result}}"

    # NOTE: We could put a notification task or something here if we wanted
    - debug:
        msg: "Failure caught, exiting play..."
      failed_when: true
      when: reboot_result.failed