Apache Tomcat 5.5 Servlet/JSP 容器Monitoring and Managing Tomcat |  |
| 前言 |
监视服务器运行状况对于今天的网路来说已经变得越来越重要。监视服务器的运行，获取统计资料，
修改服务器设置是系统管理员的日常工作。
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| 使用 JMX 遥控器的 Ant 指令来管理 Tomcat |
Tomcat 提供了使用 Ant 1.6 来管理 Tomcat 的 antlib。
antlib 把 $CATALINA_HOME/server/lib 里的 catalina-ant.jar from 复制到 $ANT_HOME/lib 里。
下面的例子显示 JMX Accessor 的使用方法：
<project name="Catalina Ant JMX"
xmlns:jmx="antlib:org.apache.catalina.ant.jmx"
default="state"
basedir=".">
<property name="jmx.server.name" value="localhost" />
<property name="jmx.server.port" value="9012" />
<property name="cluster.server.address" value="192.168.1.75" />
<property name="cluster.server.port" value="9025" />
<target name="state" description="Show JMX Cluster state">
<jmx:open
host="${jmx.server.name}"
port="${jmx.server.port}"
username="controlRole"
password="tomcat"/>
<jmx:get
name="Catalina:type=IDataSender,host=localhost,senderAddress=${cluster.server.address},senderPort=${cluster.server.port}"
attribute="connected"
resultproperty="IDataSender.backup.connected"
echo="false"
/>
<jmx:get
name="Catalina:type=ClusterSender,host=localhost"
attribute="senderObjectNames"
resultproperty="senderObjectNames"
echo="false"
/>
<!-- get current maxActiveSession from ClusterTest application
echo it to ant output and store at
property <em>clustertest.maxActiveSessions.orginal</em>
-->
<jmx:get
name="Catalina:type=Manager,path=/ClusterTest,host=localhost"
attribute="maxActiveSessions"
resultproperty="clustertest.maxActiveSessions.orginal"
echo="true"
/>
<!-- set maxActiveSession to 100
-->
<jmx:set
name="Catalina:type=Manager,path=/ClusterTest,host=localhost"
attribute="maxActiveSessions"
value="100"
type="int"
/>
<!-- get all sessions and split result as delimiter <em>SPACE</em> for easy
access all session ids directly with ant property sessions.[0..n].
-->
<jmx:invoke
name="Catalina:type=Manager,path=/ClusterTest,host=localhost"
operation="listSessionIds"
resultproperty="sessions"
echo="false"
delimiter=" "
/>
<!-- Access session attribute <em>Hello</em> from first session.
-->
<jmx:invoke
name="Catalina:type=Manager,path=/ClusterTest,host=localhost"
operation="getSessionAttribute"
resultproperty="Hello"
echo="false"
>
<arg value="${sessions.0}"/>
<arg value="Hello"/>
</jmx:invoke>
<!-- Query for all application manager.of the server from all hosts
and bind all attributes from all found manager mbeans.
-->
<jmx:query
name="Catalina:type=Manager,*"
resultproperty="manager"
echo="true"
attributebinding="true"
/>
<!-- echo the create properties -->
<echo>
senderObjectNames: ${senderObjectNames.0}
IDataSender.backup.connected: ${IDataSender.backup.connected}
session: ${sessions.0}
manager.length: ${manager.length}
manager.0.name: ${manager.0.name}
manager.1.name: ${manager.1.name}
hello: ${Hello}
manager.ClusterTest.0.name: ${manager.ClusterTest.0.name}
manager.ClusterTest.0.activeSessions: ${manager.ClusterTest.0.activeSessions}
manager.ClusterTest.0.counterSend_EVT_SESSION_EXPIRED: ${manager.ClusterTest.0.counterSend_EVT_SESSION_EXPIRED}
manager.ClusterTest.0.counterSend_EVT_GET_ALL_SESSIONS: ${manager.ClusterTest.0.counterSend_EVT_GET_ALL_SESSIONS}
</echo>
</target>
</project>
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导入： 用下面的指令导入 JMX Accessor 项目
<import file="${CATALINA.HOME}/bin/jmxaccessor-tasks.xml" /> ，
参考下面的 Ant 指令： jmxOpen, jmxSet, jmxGet,
jmxQuery, jmxInvoke,jmxEquals and jmxCondition.
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