tomcat8的session共享实现方案

tomcat8的session共享实现

下载tomcat

版本：apache-tomcat-8.0.53.zip

实现步骤，只需要两步

两个tomcat的server.xml都增加一样cluster配置

<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.MessageDispatch25Interceptor" />
    </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.ClusterSessionListener" />
</Cluster>

两个tomcat的应用的web.xml下都增加<distributable/>
比如在：
/Users/da/Library/Tomcat/apache-tomcat-8.0.53-8081/webapps/ROOT/WEB-INF/web.xml
增加：
<distributable/>

然后重启两台tomcat即可

新建jsp测试

session.jsp

<html> <head> <title>test2</title> </head> <body> SessionID is <%=session.getId()%> <BR> SessionIP is <%=request.getServerName()%> <BR> SessionPort is <%=request.getServerPort()%> <% out.println("Response from tomcat2"); %> </body> </html>

比如放置在：
/Users/da/Library/Tomcat/apache-tomcat-8.0.53-8082/webapps/ROOT/session.jsp
另一台一样。

访问：
http://localhost:8081/session.jsp
http://localhost:8082/session.jsp

sessionid一致：

SessionID is 6E5D26E07FDE6FB5D01A59F457D64333 SessionIP is tomcat.chinaunicom.tech SessionPort is 80 Response from tomcat1 SessionID is 6E5D26E07FDE6FB5D01A59F457D64333 SessionIP is tomcat.chinaunicom.tech SessionPort is 80 Response from tomcat2

注意事项

需要使用tomcat8版本（上述测试在8.0.53上通过）。如果需要tomcat7，请告诉我，不是这种配置，我需要修改一下

不要漏了distributable的配置，漏了session也不能共享

这种方案只适用于并发量较少的应用，目前可以先用着，明天我再尝试并发量大的复杂一点的方案看行不行

参考官网：
http://localhost:8082/docs/cluster-howto.html
http://tomcat.apache.org/tomcat-8.0-doc/config/cluster.html
翻译：
http://wiki.jikexueyuan.com/project/tomcat/clustering.html