nagios sensor to check wether services / server needs to be restarted. It depends on checkrestart (from debian-goodies) to list packages which needs to be restarted.

nagios-check-restart.sh

#!/usr/bin/env bash


if [ -e /var/run/reboot-required ]; then
        echo "error: need reboot (kernel upgrade)"
        exit 2
fi

checkrestart &>/dev/null || { echo 'need checkrestart (apt-get install debian-goodies) to get the actual service list' ; exit 1; }

if [ -e /var/run/reboot-required.pkgs ]; then
        echo -n 'error: services need restart ('
        checkrestart | grep service | awk '{ service[$2]++; } END { for (s in service) { printf ("%s ", s) } }'
        echo ')'
        exit 1
fi

echo "ok"
exit 0