Watchdog for tomcat

Here is just short script that restarts tomcat when it wrizes. It happens to our prod during peak load. You need to place inder webapps/ROOT directory a file isalive.html with one word ‘YES’ inside. Or alternatively modify a script and access default index.jsp.

#!/bin/sh
HOST=127.0.0.1
PORT=8080

#infinite loop
while [ 1 ]
do
	#try to access tomcat's page
	RES=`wget -O - -o /dev/null --proxy=off http://${HOST}:${PORT}/isalive.html | awk '{ print $1 }'`
	echo got ${RES}
	#decide on reply
	if [ "$RES" = "YES" ]
	then
		echo tomcat is responding on $HOST:$PORT
	else
		echo tomcat seems to be dead.
		echo Killing...
		for thepin in `ps -Af | grep -v grep | grep tomcat | grep catalina | awk '{ print $2 }'`
		do
			kill -9 ${thepin}
		done
		echo Starting...
		sudo -u tomcat /usr/local/tomcat/bin/startup.sh
	fi

sleep 60
done

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