Ping

To check the status (computers on or off) and if users are logged-in, the following playbook can be run:

- name: Ping
  hosts: computers
  gather_facts: no

  roles:

    - role: ufrmath.computer_labs.ping

which uses the role ufrmath.computer_labs.ping.

This role try to ping the computers with:

command ping -c 1 -w 1 {{ ansible_default_ipv4.address }}

and for computers which are on, return the list of logged-in users (not being admin):

who | grep -v admin