Virtual Brain/Linux/Tomcat Monitoring A simple shell script that monitors / supervises my Tomcat process and restarts it if it can not be reached. Note: - It does not access the proc-filesystem of Linux. This would be another feasible approach. - The script is to be run on the same machine as the start-script for Tomcat. - And finally: It's suitable to supervise a webserver as well, it doesn't have to be Tomcat. {code:none} #!/bin/bash #-------------------------------------------------------- # Script contacts a HTTP-Server and executes # a command if server seems to be down. #-------------------------------------------------------- # # Definitions on checked target # SERVER=localhost PORT=8080 URL=/index.jsp CONTENT="HTTP/1.1 200 OK" START_CMD=/usr/java/tomcat/bin/startup.sh RESTART_LOG=/var/log/tomcat/tomcat-restart.log RESTART_MAILADR=calvin@hobbes.com # # Contact server and save server's answer # ANSWER=`wget --server-response --output-document=- http://$SERVER:$PORT/$URL 2>&1` # # Parse answer for content # RUNNING=`echo $ANSWER | grep "$CONTENT" | wc -l` # # React according to running flag # if [ $RUNNING == 1 ] then echo "Server $SERVER:$PORT is running, ok." else DATE_STR=`date` ERR_MSG="$DATE_STR $SERVER:$PORT is NOT running, execute start command..." # Write notification to log if log file defined if [[ -n "$RESTART_LOG" ]] then echo $ERR_MSG >> $RESTART_LOG fi # Notify admin via mail if mail address defined if [[ -n "$RESTART_MAILADR" ]] then echo "The server will be restarted. Maybe you want to check http://$SERVER:$PORT$URL" | mail -s "$ERR_MSG" $RESTART_MAILADR fi exec $START_CMD fi {code} 2005-05-19 23:08:06.511 2005-04-20 22:57:35.547