Tomcat中session复制技术

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一、准备三台机器
主机的服务都正常，nginx与Tomcat构建负载均衡

主机名 IP地址

nginx 192.168.200.111

Tomcat1 192.168.200.112

Tomcat2 192.168.200.113

准备hosts文件，并修改主机名为nginx 、tomcat1 、tomcat2

[root@localhost ~]# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
:: localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.200.111 nginx
192.168.200.112 tomcat1
192.168.200.113 tomcat2
[root@localhost ~]# hostname nginx
[root@localhost ~]# bash
[root@nginx ~]#

使用scp将/etc/hosts文件传到其它两台上

[root@nginx ~]# scp /etc/hosts 192.168.200.112:/etc/hosts
hosts hosts.allow hosts.deny
[root@nginx ~]# scp /etc/hosts 192.168.200.112:/etc/hosts
The authenticity of host '192.168.200.112 (192.168.200.112)' can't be established.
ECDSA key fingerprint is a1:3a:d3:5a:d8:dc:::ee:be:5c::::c3:db.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.200.112' (ECDSA) to the list of known hosts.
root@192.168.200.112's password:
hosts
————————————————————————
[root@nginx ~]# scp /etc/hosts 192.168.200.113:/etc/hosts
The authenticity of host '192.168.200.113 (192.168.200.113)' can't be established.
ECDSA key fingerprint is d2:9d:0f:d3:4f:8b::f7:9d:e4:7c:9b:::bc:.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.200.113' (ECDSA) to the list of known hosts.
root@192.168.200.113's password:
hosts
_________________________________________________________________________
修改主机名
[root@localhost ~]# hostname tomcat1
[root@localhost ~]# bash
[root@localhost ~]# hostname tomcat2
[root@localhost ~]# bash

二、修改Tomcat配置文件开启session复制功能

[root@tomcat2 ~]# vim /usr/local/tomcat/conf/server.xml
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2"> #另一台改为Tomcat1
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
————————————————————————————————————————
[root@tomcat2 ~]# vim /usr/local/tomcat/webapps/ROOT/WEB-INF/web.xml
<distributable/>

三、准备测试文件，重启服务测试

[root@tomcat1 ~]# vim /usr/local/tomcat/webapps/ROOT/session.jsp
Session ID:<%= session.getId() %><BR>
SessionPort:<%= request.getServerPort() %>
<% out.println("This tomcat server 192.168.200.112");%>
————————————————————————————————————————————
[root@tomcat2 ~]# vim /usr/local/tomcat/webapps/ROOT/session.jsp
Session ID:<%= session.getId() %><BR>
SessionPort:<%= request.getServerPort() %>
<% out.println("This tomcat server 192.168.200.113");%>

[root@tomcat2 ~]# /usr/local/tomcat/bin/shutdown.sh
[root@tomcat2 ~]# /usr/local/tomcat/bin/startup.sh

测试结果

四、补充Tomcat官方session复制方式
注：其它更改还需要设置，与上边一样
别忘了加 jvmRoute=“tomcat2”

[root@tomcat2 ~]# vim /usr/local/tomcat/conf/server.xml

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="">
<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="228.25.25.4"
port=""
frequency=""
dropTime=""/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.200.112" #另一台将地址改为113
port=""
autoBind=""
selectorTimeout=""
maxThreads=""/>
<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.JvmRouteSessionIDBinderListener"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>