On Sat, 7 Nov 2020, Jason Antman wrote:
* One CyberPower UPS powering everything
* Three Linux machines, "A", "B", and "C"
* A bunch of network devices, as well as two Raspberry Pis
I'm trying to achieve the following shutdown behavior:
* Kill host A when battery drops to 80%
* Kill host B at 50%
* Kill host C at 10%
* Leave the outputs turned on always, so the network and Pis keep running
* If the power comes back before the battery is exhausted, a script will turn
on hosts A, B, and C via wake-on-lan.
I found the "nut2" Python package (https://github.com/rshipp/python-nut2)
which is built on top of python's telnetlib. That should make most of the
logic rather simple, certainly as compared to the C implementation. It
shouldn't be too difficult to handle that reliably.
It should be even simpler to use upsmon as a passthrough to upssched + a Bash
script often called upssched-cmd. Working in Python is very interesting, but a
custom upssched.conf and Bash script for A, B and C should be quite sufficient
for your setup.
Roger
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