Tomcat集群中实现session共享

蔚落 2022-05-22 04:24 234阅读 0赞

**Tomcat集群中实现session共享，会话保持**

Tomcat自带的session cluster方式可以实现会话共享。  
tomcat自带的cluster是基于多播传递以及时间同步的方式，使用session cluster，可以将本地的session复制传递给集群中的其它服务器，多个tomcat间自动实时复制session信息，从而实现session保持。

**一、编辑测试页面，返回会话id**

**Tomcat LB集群搭建参考《Tomcat LB 负载均衡集群实现》**

**链接：https://blog.csdn.net/field\_yang/article/details/80698498**

\[root@test conf\]\# cd  /data/webapps/ROOT/

\[root@test ROOT\]\# vim  index.jsp

\[root@test ROOT\]\# more  index.jsp

<%@ page language="java" %>

<html>

<head><title>Tomcat1</title></head>

<body>

<h1><fontcolor="blue">test.field.com/Tomcat1</font></h1>

<tr>

<td>Session ID</td>

<%session.setAttribute("test.field.com","test.field.com");%>

</tr>

<tr>

<td>Created on</td>

</tr>

</table>

</body>

</html>

\[root@www ROOT\]\# cd  /data/webapps/ROOT/

\[root@www ROOT\]\# vim  index.jsp

\[root@www ROOT\]\# more  index.jsp

<%@ page language="java" %>

<html>

<head><title>Tomcat2</title></head>

<body>

<h1><fontcolor="blue">web1.field.com/Tomcat2</font></h1>

<tr>

<td>Session ID</td>

<%session.setAttribute("web1.field.com","web1.field.com");%>

</tr>

<tr>

<td>Created on</td>

</tr>

</table>

</body>

</html>

**访问：http://192.168.88.132/index.jsp，刷新，每次返回的session都不一样，如图为在Google四次刷新。**

web1.field.com/Tomcat2

Session ID         B5303B4675D513BB409F0824AFEF4121

Created on       1528978355101

test.field.com/Tomcat1

Session ID         4FF2A9DF3CEE3E70AE8464573E9A5C1A

Created on       1528978640933

test.field.com/Tomcat1

Session ID         C1D5F6FA4B7DD09C78FE07A7F7C60806

Created on       1528978657213

web1.field.com/Tomcat2

Session ID         3CDB193E556D9766D0F5A5F01B1A598C

Created on       1528978669299

![70][]

**二、添加session共享**

**添加session共享只需两步**

**1、编辑server.xml**

在<Host name="test.field.com"appBase="/data/webapps" unpackWARs="true"autoDeploy="false">

行下面添加<Cluster ...> ...         </Cluster>之间的内容。

此段代码及用法可以从Tomcat官方文档获取《https://tomcat.apache.org/tomcat-8.0-doc/cluster-howto.html》

此处只需修改：

多播地址：address="228.0.1.8"

服务器地址：address="auto"为address="192.168.88.130"

**1）、Tomcat1修改**

\[root@test conf\]\# vim  server.xml

<ClusterclassName="org.apache.catalina.ha.tcp.SimpleTcpCluster"

channelSendOptions="8">

<ManagerclassName="org.apache.catalina.ha.session.DeltaManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

<ChannelclassName="org.apache.catalina.tribes.group.GroupChannel">

<MembershipclassName="org.apache.catalina.tribes.membership.McastService"

address="228.0.1.8"

port="45564"

frequency="500"

dropTime="3000"/>

<ReceiverclassName="org.apache.catalina.tribes.transport.nio.NioReceiver"

address="192.168.88.130"

port="4000"

autoBind="100"

selectorTimeout="5000"

maxThreads="6"/>

<SenderclassName="org.apache.catalina.tribes.transport.ReplicationTransmitter">

<TransportclassName="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>

</Sender>

<InterceptorclassName="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>

<InterceptorclassName="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>

</Channel>

<ValveclassName="org.apache.catalina.ha.tcp.ReplicationValve"

filter=""/>

<ValveclassName="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

<DeployerclassName="org.apache.catalina.ha.deploy.FarmWarDeployer"

tempDir="/tmp/war-temp/"

deployDir="/tmp/war-deploy/"

watchDir="/tmp/war-listen/"

watchEnabled="false"/>

<ClusterListenerclassName="org.apache.catalina.ha.session.ClusterSessionListener"/>

</Cluster>

**2）、Tomcat2修改**

\[root@www conf\]\# vim  server.xml

<ClusterclassName="org.apache.catalina.ha.tcp.SimpleTcpCluster"

channelSendOptions="8">

<Manager className="org.apache.catalina.ha.session.DeltaManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

<ChannelclassName="org.apache.catalina.tribes.group.GroupChannel">

<MembershipclassName="org.apache.catalina.tribes.membership.McastService"

address="228.0.1.8"

port="45564"

frequency="500"

dropTime="3000"/>

<ReceiverclassName="org.apache.catalina.tribes.transport.nio.NioReceiver"

address="192.168.88.131"

port="4000"

autoBind="100"

selectorTimeout="5000"

maxThreads="6"/>

<SenderclassName="org.apache.catalina.tribes.transport.ReplicationTransmitter">

<TransportclassName="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>

</Sender>

<InterceptorclassName="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>

<InterceptorclassName="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>

</Channel>

<ValveclassName="org.apache.catalina.ha.tcp.ReplicationValve"

filter=""/>

<ValveclassName="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

<DeployerclassName="org.apache.catalina.ha.deploy.FarmWarDeployer"

tempDir="/tmp/war-temp/"

deployDir="/tmp/war-deploy/"

watchDir="/tmp/war-listen/"

watchEnabled="false"/>

<ClusterListenerclassName="org.apache.catalina.ha.session.ClusterSessionListener"/>

</Cluster>

**3）、两台机上检查Tomcat语法：catalina.shconfigtest**

\[root@www conf\]\#catalina.sh  configtest

Using CATALINA\_BASE:   /usr/local/tomcat

Using CATALINA\_HOME:   /usr/local/tomcat

Using CATALINA\_TMPDIR:/usr/local/tomcat/temp

Using JRE\_HOME:        /usr/java/latest

Using CLASSPATH:      /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar