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.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.ClusterSessionListener" />
</Cluster>
- 两个tomcat的应用的web.xml下都增加
比如在：
/Users/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/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，需要修改配置
- 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，并发量大需使用redis等方案
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