SANYALnet Labs | Save State of VirtualBox Virtual Machines on APC UPS power loss shutdown by apcupsd Linux Daemon / onbattery event handler script: see https://supratim-sanyal.blogspot.com/2021/09/save-state-of-virtualbox-virtual.html

onbattery

#!/bin/bash
#
# /etc/apcupsd/onbattery
#
# This shell script if placed in /etc/apcupsd
# will be called by /etc/apcupsd/apccontrol when the UPS
# goes on batteries.
# We send an email message to root to notify him.
#

# On AC power loss, the events raised seem to be:
# 2021-08-17 11:13:34 +0000  Power failure.
# 2021-08-17 11:13:40 +0000  Running on UPS batteries.
# 2021-08-17 11:13:43 +0000  Reached remaining time percentage limit on batteries.
# 2021-08-17 11:13:43 +0000  Initiating system shutdown!
# apccontrol seems to fork off the scripts for later events even when prior events
# are still being handled. So all other event handlers are coded to return 99
# to abort, so that only this one processes the "on battery" event completely
# and shuts down


logger "$0 $(date): START"
wall "$0 $(date): START"
echo "$0 $(date): START"

#HOSTNAME=`hostname`
#MSG="$HOSTNAME UPS $1 Power Failure !!!"
#
#(
#   echo "$MSG"
#   echo " "
#   /sbin/apcaccess status
#) | $APCUPSD_MAIL -s "$MSG" $SYSADMIN

# Reclaim cache memory
time /root/clear-kernel-memory-cache.sh > /var/log/clear-kernel-memory-cache.shutdown.log 2>&1

time /root/save-vms-on-ups-power.sh > /var/log/save-vms-on-ups-power.shutdown.log 2>&1

sync;sync;sync
poweroff

# Exit 0 for apcupsd to continue to shutdown; 99 to abort shutdown
logger "$0 $(date): END"
wall "$0 $(date): END"
echo "$0 $(date): END"
exit 0