6. Run a UPS drain test!

It would not be a real tutorial if we did not actually test what we prepared for our disaster recovery situation 😉

Back up / snapshot any critical VMs and containers just in case
Ensure that anything important is not plugged into the UPS ports that are not actually backed up (some UPS units have more electrical plugs that are not battery-covered).
On the RPi, watch the log – tail -f /var/log/ups_manager.log to watch for any changes in real time.
Unplug your UPS unit and wait a little. Within a minut, you should receive a notification from Uptime Kuma.

Verify that you receive notifications on power outage - this one is from Uptime Kuma — Uptime Kuma warning on Discord during a power outage test

And within another minute, an email alert:

Example of an email notification sent to my Gmail during a power outage test. — Email notification on power loss – example

Lastly, check the output from the log available in /var/log/ups-manager.log .

Output from the ups-manager.log file that demonstrates that our script is working and that the same hosts are not being repeatedly sent for shutdown. — Evidence that the script is working and triggers every 2 minutes.

You can see that once one host is sent a request for a shutdown, the flag is raised and thus the script does not attempt to shut it down again and again.

6. Run a UPS drain test!

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