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

1. 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>

1. 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/>

1. 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

1. 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
2. 不要漏了distributable的配置，漏了session也不能共享
3. 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