Hi!
Some systems I have take some time to shut down, so I would like them to shut down if the UPS have been on battery for 2 minutes. That include my primary ipfire.
Internet has told me that SHUTDOWNCMD “/sbin/shutdown -h +0” in /etc/nut/upsmon.conf will execute when the UPS is both OB (on battery) and LB (Low battery). Like in wiki.ipfire.org - Detailed NUT Configuration where it says
“SHUTDOWNCMD “/sbin/shutdown -h +0” this command will be triggered if UPS sends the BL (Battery Low) flag.”
But I would like to be on the safest side, and not hope “low battery” is enough time to shut down. So 2 minutes sound much more safe for paranoid me.
I do not know much about NUT, but after some Googling, one idea I have is to in /etc/nut/upsmon.conf on client change to this
NOTIFYCMD "/etc/nut/shutdown_script.sh"
NOTIFYFLAG ONBATT EXEC
And then in /etc/nut/shutdown_script.sh have something like this
#!/bin/bash
poll_interval=5
wait_time=120
counter=0
no_wait_time=60
no_counter=0
while true
do
output=$(upsc qnapups@192.168.222.252 ups.status)
if echo "$output" | grep -q "OB"
then
counter=$((counter + poll_interval))
no_counter=0
else
counter=0
no_counter=$((no_counter + poll_interval))
fi
if [ $counter -ge $wait_time ]
then
echo "Still outoput OB = On Battery, after 2 min. I will now shut down"
# Here I will shutdown the system
# "/sbin/shutdown -h +0"
break
fi
if [ $no_counter -ge $no_wait_time ]
then
echo "Have not seen OB for 1 min, so quiting the script"
break
fi
sleep $poll_interval
done
But now I am starting to wonder if I am overdoing this. Surely there must already be a ready-made solution for this in NUT somewhere, but I have just searched with wrong words i Google.
Have any of you done something similar with NUT, and what is the right way to do it?
