在完成Tomcat Cluster的安裝後（請參考
http://www.andowson.com/posts/list/315.page這篇），我們可以透過JConsole來監控Tomcat運行的狀態，只需要修改Tomcat啟動時的設定即可。
1.修改setenv.sh，加上下列設定
CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=${JMX_PORT} -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"
修改後的完整內容如下：
JAVA_HOME="/usr/java/latest"
JAVA_OPTS="-server -XX:NewSize=503m -XX:MaxNewSize=503m -XX:SurvivorRatio=8 -XX:MaxPermSize=128m -Xss768k -Xms2013m -Xmx2013m -Djava.net.preferIPv4Stack=true -Djava.awt.headless=true"
CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=${JMX_PORT} -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"
2.修改/etc/init.d/tomcat
(1)在原先的WORKER_PORT=( 8105 8205 )下面，加上JMX_PORTS=( 9105 9205 )
(2)在start()中，將原先的
su -l $TOMCAT_USER -c "export CATALINA_BASE=$CATALINA_BASE; $CATALINA_HOME/bin/startup.sh"
改為
su -l $TOMCAT_USER -c "export CATALINA_BASE=$CATALINA_BASE; export JMX_PORT=${JMX_PORTS[i]}; $CATALINA_HOME/bin/startup.sh"
修改後的完整內容如下：
#!/bin/sh
#
# Startup script for Tomcat, the Apache Servlet Engine
#
# chkconfig: - 84 16
# description: Tomcat Servlet Engine
# processname: tomcat
# pidfile: /var/run/worker1.pid /var/run/worker2.pid
# Source function library.
. /etc/rc.d/init.d/functions
# User under which tomcat will run
TOMCAT_USER=tomcat
RETVAL=0
CATALINA_HOME=/var/tomcat6
WORKER_ROOT=/var/robust
WORKER_LIST=( worker1 worker2 )
WORKER_PORT=( 8105 8205 )
JMX_PORTS=( 9105 9205 )
# start, debug, stop, and status functions
start() {
i=$1
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
if [ $SHUTDOWN_PORT -ne 0 ]; then
echo "Tomcat ${WORKER_LIST[i]} already started"
else
echo "Starting tomcat ${WORKER_LIST[i]}..."
CATALINA_BASE="$WORKER_ROOT/${WORKER_LIST[i]}"
chown -R $TOMCAT_USER:$TOMCAT_USER $CATALINA_HOME
chown -R $TOMCAT_USER:$TOMCAT_USER $WORKER_ROOT
su -l $TOMCAT_USER -c "export CATALINA_BASE=$CATALINA_BASE; export JMX_PORT=${JMX_PORTS[i]}; $CATALINA_HOME/bin/startup.sh"
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
while [ $SHUTDOWN_PORT -eq 0 ]; do
sleep 1
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
done
echo "Tomcat ${WORKER_LIST[i]} started in normal mode"
RETVAL=$?
[ $RETVAL = 0 ] && touch /var/lock/subsys/${WORKER_LIST[i]} /var/run/${WORKER_LIST[i]}.pid
fi
}
debug() {
i=$1
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
if [ $SHUTDOWN_PORT -ne 0 ]; then
echo "Tomcat ${WORKER_LIST[i]} already started"
else
echo "Starting tomcat ${WORKER_LIST[i]} in debug mode..."
CATALINA_BASE="$WORKER_ROOT/${WORKER_LIST[i]}"
rm -rf $CATALINA_BASE/work/*
chown -R $TOMCAT_USER:$TOMCAT_USER $CATALINA_HOME
chown -R $TOMCAT_USER:$TOMCAT_USER $WORKER_ROOT
su -l $TOMCAT_USER -c "export CATALINA_BASE=$CATALINA_BASE; $CATALINA_HOME/bin/catalina.sh jpda start"
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
while [ $SHUTDOWN_PORT -eq 0 ]; do
sleep 1
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
done
echo "Tomcat ${WORKER_LIST[i]} started in debug mode"
RETVAL=$?
[ $RETVAL = 0 ] && touch /var/lock/subsys/${WORKER_LIST[i]} /var/run/${WORKER_LIST[i]}.pid
fi
}
stop() {
i=$1
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
if [ $SHUTDOWN_PORT -eq 0 ]; then
echo "Tomcat ${WORKER_LIST[i]} already stopped"
else
echo "Stopping tomcat ${WORKER_LIST[i]} ..."
CATALINA_BASE="$WORKER_ROOT/${WORKER_LIST[i]}"
su -l $TOMCAT_USER -c "export CATALINA_BASE=$CATALINA_BASE; $CATALINA_HOME/bin/shutdown.sh"
SHUTDOWN_PORT=`ps -ef|grep ${WORKER_LIST[i]}|grep -v grep|wc -l`
while [ $SHUTDOWN_PORT -ne 0 ]; do
sleep 1
SHUTDOWN_PORT=`ps -ef|grep ${WORKER_LIST[i]}|grep -v grep|wc -l`
done
echo "Tomcat ${WORKER_LIST[i]} stopped"
RETVAL=$?
[ $RETVAL=0 ] && rm -f /var/lock/subsys/${WORKER_LIST[i]} /var/run/${WORKER_LIST[i]}.pid
fi
}
status() {
for (( i = 0 ; i < ${#WORKER_LIST[@]} ; i++ ))
do
SHUTDOWN_PORT=`netstat -vatn|grep LISTEN|grep ${WORKER_PORT[i]}|wc -l`
if [ $SHUTDOWN_PORT -eq 0 ]; then
echo "Tomcat ${WORKER_LIST[i]} stopped"
else
MODE="normal"
JPDA_PORT=`netstat -vatn|grep LISTEN|grep 8000|wc -l`
if [ $JPDA_PORT -ne 0 ]; then
MODE="debug"
fi
echo "Tomcat ${WORKER_LIST[i]} running in $MODE mode"
fi
done
}
case "$1" in
start)
start 0
start 1
;;
debug)
debug 0
debug 1
;;
stop)
stop 0
stop 1
;;
restart)
stop 0
start 0
stop 1
start 1
;;
redebug)
stop 0
debug 0
stop 1
debug 1
;;
status)
status
;;
*)
echo "Usage: $0 {start|debug|stop|restart|redebug|status}"
exit 1
esac
exit $RETVAL
接下來就可以用jconsole來連了，
在Windows主機上安裝JDK 5以上版本，然後設定好JAVA_HOME及Path環境變數，接著開一個命令列視窗，然後輸入jconsole這個指令來執行
在Remote Process那邊輸入<Host IP>:<JMX Port>，例如
10.66.19.16:9205
再點選Connect按鈕，如果一切正常就可以看到畫面了
障礙排除：
如果連線失敗請參考注意事項：
*注意事項：請用"hostname -i"檢查一下是否回傳主機的真實IP，而非127.0.0.1，如果回傳127.0.0.1，則需修改/etc/hosts，將hostname另外設定IP，參考範例如下：
127.0.0.1 localhost.localdomain localhost
10.66.19.16 www
另外執行"/sbin/iptables --list"檢查是否有防火牆設定。
參考資料
http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html
http://java.sun.com/javase/6/docs/technotes/guides/management/faq.html#linux1
