讓Tomcat啟動時支援JMX，可以透過JConsole遠端管理

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

檔案名稱 tomcat

描述 tomcat with JMX support

檔案大小 4 Kbytes

下載次數 4 次

[Disk] 下載

檔案名稱 setenv.sh

描述 setenv with JMX support

檔案大小 399 bytes

下載次數 4 次

[Disk] 下載

檔案名稱	tomcat
描述	tomcat with JMX support
檔案大小	4 Kbytes
下載次數	4 次
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檔案名稱	setenv.sh
描述	setenv with JMX support
檔案大小	399 bytes
下載次數	4 次
下載