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Tomcat集群中实现session共享

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" %>

Tomcat1

test.field.com/Tomcat1

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

Session ID	<%= session.getId()%>
Created on	<%= session.getCreationTime() %>

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

[root@www ROOT]# vim index.jsp

[root@www ROOT]# more index.jsp

<%@ page language="java" %>

Tomcat2

web1.field.com/Tomcat2

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

Session ID	<%= session.getId() %>
Created on	<%= session.getCreationTime() %>

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

二、添加session共享

添加session共享只需两步

1、编辑server.xml

在

行下面添加 ... 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

channelSendOptions="8">

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

address="228.0.1.8"

port="45564"

frequency="500"

dropTime="3000"/>

address="192.168.88.130"

port="4000"

autoBind="100"

selectorTimeout="5000"

maxThreads="6"/>

filter=""/>

tempDir="/tmp/war-temp/"

deployDir="/tmp/war-deploy/"

watchDir="/tmp/war-listen/"

watchEnabled="false"/>

2）、Tomcat2修改

[root@www conf]# vim server.xml

channelSendOptions="8">

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

address="228.0.1.8"

port="45564"

frequency="500"

dropTime="3000"/>

address="192.168.88.131"

port="4000"

autoBind="100"

selectorTimeout="5000"

maxThreads="6"/>

filter=""/>

tempDir="/tmp/war-temp/"

deployDir="/tmp/war-deploy/"

watchDir="/tmp/war-listen/"

watchEnabled="false"/>

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