前文，我們介紹了tomcat負載均衡安裝和配置的內容，前面主要針對的是負載均衡的配置代碼介紹。那么接下來，就是針對于tomcat集群配置的代碼內容，之后的應用配置也做了簡要的敘述。

◆tomcat集群配置

(1)負載均衡配置的條件下配置tomcat集群

(2)分別修改三個tomcat的配置文件conf/server.xml,修改內容如下

修改前

<!--   
<Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster" 
         managerClassName="org.apache.catalina.cluster.session.DeltaManager" 
         expireSessionsOnShutdown="false" 
         useDirtyFlag="true" 
         notifyListenersOnReplication="true">  
 
    <Membership   
        className="org.apache.catalina.cluster.mcast.McastService" 
        mcastAddr="228.0.0.4" 
        mcastPort="45564" 
        mcastFrequency="500" 
        mcastDropTime="3000"/>  
 
    <Receiver   
        className="org.apache.catalina.cluster.tcp.ReplicationListener" 
        tcpListenAddress="auto" 
        tcpListenPort="4001" 
        tcpSelectorTimeout="100" 
        tcpThreadCount="6"/>  
 
    <Sender  
        className="org.apache.catalina.cluster.tcp.ReplicationTransmitter" 
        replicationMode="pooled" 
        ackTimeout="5000"/>  
 
    <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve" 
           filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>  
             
    <Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer" 
              tempDir="/tmp/war-temp/" 
              deployDir="/tmp/war-deploy/" 
              watchDir="/tmp/war-listen/" 
              watchEnabled="false"/>  
                
    <ClusterListener className="org.apache.catalina.cluster.session.ClusterSessionListener"/>  
</Cluster>  
-->    

#p#修改后

<!-- modify by whh -->  
<Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster" 
         managerClassName="org.apache.catalina.cluster.session.DeltaManager" 
         expireSessionsOnShutdown="false" 
         useDirtyFlag="true" 
         notifyListenersOnReplication="true">  
 
    <Membership   
        className="org.apache.catalina.cluster.mcast.McastService" 
        mcastAddr="228.0.0.4" 
        mcastPort="45564" 
        mcastFrequency="500" 
        mcastDropTime="3000"/>  
 
    <Receiver   
        className="org.apache.catalina.cluster.tcp.ReplicationListener" 
        tcpListenAddress="auto" 
        tcpListenPort="4001" 
        tcpSelectorTimeout="100" 
        tcpThreadCount="6"/>  
 
    <Sender  
        className="org.apache.catalina.cluster.tcp.ReplicationTransmitter" 
        replicationMode="pooled" 
        ackTimeout="5000"/>  
 
    <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve" 
           filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>  
             
    <Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer" 
              tempDir="/tmp/war-temp/" 
              deployDir="/tmp/war-deploy/" 
              watchDir="/tmp/war-listen/" 
              watchEnabled="false"/>  
                
    <ClusterListener className="org.apache.catalina.cluster.session.ClusterSessionListener"/>  
</Cluster>  
!-- modify by whh -->   

將集群配置選項的注釋放開即可,如上｡

(3)重啟三個tomcat｡到此負載均衡配置下tomcat的集群已配置完成｡#p#

◆應用配置

對于要進行負載和集群的的tomcat目錄下的webapps中的應用中的WEB-INF中的web.xml文件要添加如下一句負載均衡配置

<distributable/> 

配置前

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">  
  <display-name>TomcatDemo</display-name>  
</web-app> 

配置后

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">  
  <display-name>TomcatDemo</display-name>  
   <distributable/>  
</web-app>