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check_pid.sh
executable file
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check_pid.sh
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#!/usr/bin/env bash
# Author: Jon Schipp
# Date: 04-15-2014
########
# Examples:
# 1.) Check if sshd has restarted since last check
# $ ./check_pid.sh -f /var/run/sshd.pid
# Nagios Exit Codes
OK=0
WARNING=1
CRITICAL=2
UNKNOWN=3
usage()
{
cat <<EOF
Check if a service has been restarted by comparing its PID to each previous run.
Options:
-f Specify PID filename as full path
-o Temporary PID file storage directory (def: /tmp)
Usage: $0 -f /var/run/sshd.pid -o /tmp/pids/
EOF
}
if [ $# -lt 1 ];
then
usage
exit 1
fi
# Define now to prevent expected number errors
DIR=/tmp
CHECK=0
COUNT=0
while getopts "hf:o:" OPTION
do
case $OPTION in
h)
usage
;;
f)
FILEPATH="$OPTARG"
CHECK=1
;;
o)
DIR="$OPTARG"
;;
\?)
exit 1
;;
esac
done
FILE=$(echo $FILEPATH | sed 's/^.*\///')
if [ ! -f $FILEPATH ]; then
echo "File doesn't exist or is not a regular file!"
exit $UNKNOWN
fi
if [ $CHECK -eq 1 ]; then
if [ ! -f $DIR/$FILE ]; then
echo "First run for PID or can't access file in temporary storage location: $DIR/$FILE"
cp -f $FILEPATH $DIR
exit $UNKNOWN
fi
# In case the PID is temporarily locked by another program
until [ ! -z $NEWPID ] && [ ! -z $OLDPID ];
do
NEWPID=$(cat $FILEPATH)
OLDPID=$(cat $DIR/$FILE)
COUNT=$((COUNT+1))
if [ $COUNT -ge 10 ]
then
break
fi
done
if [ $NEWPID -eq $OLDPID ]; then
echo "Service is still running with the same PID: $(echo $NEWPID)"
cp -f $FILEPATH $DIR
exit $OK
else
echo "Service restarted. OLDPID: $(echo $OLDPID) NEWPID: $(echo $NEWPID)"
cp -f $FILEPATH $DIR
exit $CRITICAL
fi
fi