-->
<Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1">
<!--
<Engine name="Catalina" defaultHost="localhost">
-->
说明：
第一台tomcat就把jvmRoute="tomcat1"
第二台tomcat就把jvmRoute="tomcat2"
第三台tomcat就把jvmRoute="tomcat3"
**开放集群
**修改tomcat 的 conf/server.xml (使用ajp协议时配置)
在<Engine> 后面或者 <Host>后面简单的加上
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
也可以加上更详细参数的集群配置内容（这是官方默认，请自行修改相关参数）：
<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"/>
