tomcat配置集群

在Tomcat中使用集群功能相对简单。最简单的用法是直接在server.xml文件的或节点下添加

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
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配置，这意味着集群相关的配置都使用默认的，它其实等同于

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">          <Manager className="org.apache.catalina.ha.session.DeltaManager"                   expireSessionsOnShutdown="false"                   notifyListenersOnReplication="true"/>          <Channel className="org.apache.catalina.tribes.group.GroupChannel">            <Membership className="org.apache.catalina.tribes.membership.McastService"                        address="228.0.0.4"                        port="45564"                        frequency="500"                        dropTime="3000"/>            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"                      address="auto"                      port="4000"                      autoBind="100"                      selectorTimeout="5000"                      maxThreads="6"/>            <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">              <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>            </Sender>            <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>            <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>          </Channel>          <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"                 filter=""/>          <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>          <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"                    tempDir="/tmp/war-temp/"                    deployDir="/tmp/war-deploy/"                    watchDir="/tmp/war-listen/"                    watchEnabled="false"/>          <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener">          <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener">        </Cluster>
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默认情况下使用DeltaManager会话管理器；使用GroupChannel作为集群通信通道，组播地址和端口为228.0.0.4和45564，使用ReplicationTransmitter作为消息发射器，使用NioReceiver作为消息接收器，另外添加TcpFailureDetector和MessageDispatch15Interceptor两个拦截器；使用ReplicationValve和JvmRouteBinderValve管道阀门；使用FarmWarDeployer作为集群部署器；添加JvmRouteSessionIDBinderListener和ClusterSessionListener集群监听器。