icinga2-checks/check_systemd_service.sh

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#!/bin/bash
function usage {
echo "Usage:
-u [UNIT name]
-t Service is triggered by a timer and is allowed to be inactive"
}
# Initialize variables
UNIT=""
IS_TIMER=false
# Parse command line arguments
while getopts "u:t" opt; do
case ${opt} in
u )
UNIT=$OPTARG
;;
t )
IS_TIMER=true
;;
\? )
echo "Invalid option: $OPTARG" 1>&2
exit 1
;;
: )
echo "Invalid option: $OPTARG requires an argument" 1>&2
exit 1
;;
esac
done
shift $((OPTIND -1))
# Check if UNIT name is provided
if [ -z "$UNIT" ]; then
usage
exit -1
fi
# Check if the unit is enabled
enabled=$(systemctl is-enabled "$UNIT")
if [ "$enabled" != "enabled" ]; then
echo "CRITICAL - $UNIT is not enabled"
exit 2
fi
# Check if the unit is active
active=$(systemctl is-active "$UNIT")
substate=$(systemctl show "$UNIT" --property=SubState --value)
if [ "$active" = "activating" ]; then
echo "WARNING - $UNIT is activating"
exit 1
elif [ "$active" != "active" ] || { [ "$substate" = "exited" ] && [ "$IS_TIMER" = false ]; }; then
echo "CRITICAL - $UNIT is not active"
exit 2
fi
if [ "$IS_TIMER" = true ] && [ "$substate" = "exited" ]; then
echo "OK - $UNIT is active (exited) and enabled"
else
echo "OK - $UNIT is active and enabled"
fi
exit 0