ProxyRequests Off
ProxyPass /examples balancer://mycluster/ stickysession=JSESSIONID

ProxyPassReverse /examples balancer://mycluster/ stickysession=JSESSIONID
<Proxy balancer://mycluster>
     BalancerMember ajp://192.168.1.102:8009/examples/ route=worker1 loadfactor=1
     BalancerMember ajp://192.168.1.102:8909/examples/ route=worker2 loadfactor=1
</Proxy>
SetHandler balancer-manager

如图

#上面ip端口红色部分与apache-tomcat-x.x.x/config/server.xml  中<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> 中的端口保持一直

d.编辑tomcat1/apache-tomcat-6.0.32/config/server.xml

server.xml文件,如果tomcat在不同机器上，则不需要修改，本人环境是本机上测试.所以其中的一个tomcat的端口一定要修改

需要修改的地方（红色部分）

<Connector port="8080" protocol="HTTP/1.1"
             connectionTimeout="20000"
             redirectPort="8443" />

<Server port="8005" shutdown="SHUTDOWN">

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

把这段信息<Engine name="Catalina" defaultHost="localhost"/>

用下面的配置信息覆盖,如果在本机中红色端口需要修改，jvmRoute参数不能一样

<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1"/>

<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="192.168.1.102"
                      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>

e.配置tomcat.x.x.x/webapps/examples/WEB-INF/web.xml,加上红色部分，以支持seesion复制

在<webapp>

...........

.........

<distributable/>

</webapp>

最后.复制tomcat下webapps下的文件到 /opt/web/apache2/htdocs

cp –R  /opt/web/tomcat1/apache-tomcat-6.0.32/webapps/* /opt/web/apache2/htdocs

到这里负载均衡和session复配置已经完成

开始启动 apache2

cd /opt/web/apache2/bin

./apachectl -k start

启动2个tomcat

cd /opt/web/tomcat2/apache-tomcat-6.0.32/bin

./start.sh

cd /opt/web/tomcat1/apache-tomcat-6.0.32/bin

./start.sh

测试session 复制

http://192.168.1.102/examples/servlets/servlet/SessionExample

查看负载均衡

http://192.168.1.102/balancer-manager

但是有个问题，如果session有很多对象，而对象又不停的变化，这就使得seesion会消耗很大性能.

网上查了下,可以用memcached来做缓存应用.有时间再把这个整理下