For a while, rebooting a Linux machine using Ansible has been done primarily using a combination of a reboot shell command module and a wait_for clause to pause execution of other tasks until that machine has came back up. This is also the method that is being taught at the current available revision of DO407 Automation with Ansible course by Red Hat (based on Ansible 2.3). Using this method can be done as follows:
---
- name: Reboot and wait until the server is up
hosts: server1
tasks:
- name: reboot machine
shell: sleep 2; shutdown -r now "Ansible triggered reboot"
async: 1
poll: 0
ignore_errors: true
- name: Wait for server to come back
wait_for:
host: "{{ inventory_hostname }}"
state: started
delay: 30
timeout: 300
port: 22
delegate_to: localhost