Is there an easy way to do this?

I have a UPS connected to my freenas box, and using NUT and UPSC I can
monitor the battery level on my centos 7 host.

In the case of an emergency, and my UPS goes below, lets say 40% battery, I
would like to make a script to shutdown all running VMs, and then reboot
the host.

Otherwise I am afraid of sending a straight reboot command to the host
without taking care of the virtual machines first.

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