Generic watchdog script

watchdog.cron

* * * * * root /usr/local/bin/foo-watchdog.sh

watchdog.logrotate

/var/log/var/log/foo-watchdog.log {
	rotate 5
	daily
	middingok
	compress
	copytruncate
}

watchdog.sh

#!/bin/bash

LOG=/var/log/foo-watchdog.log
PIDFILE=/var/run/foo.pid

# Check watchdog script isn't already running
count=`pgrep -c -f $0`
if [ $count -gt 2 ]; then
	exit 0
fi

# Restart process if PID file is present but the process is not running
if [ -f $PIDFILE ]; then
	PROC_ID=`pgrep -u foo foo`
	if [ -z $PROC_ID ]; then
		echo "`date` - Foo has crashed - restarting.." >> $LOG
		/etc/init.d/foo start >> $LOG 2>&1
	fi
fi