本文记录nginx+redis+tomcat实现session共享的过程
nginx安装：http://blog.csdn.net/grhlove123/article/details/47834673
redis安装：http://blog.csdn.net/grhlove123/article/details/47783471
准备两个tomcat，修改相应的端口
| 名称 | IP | 端口 | tomcat版本 | JDK |
| tomcat1 | 10.10.49.23 | 8080 | 7.0.40 | 1.7.0_25 |
| tomcat2 | 10.10.49.15 | 8081 | 7.0.40 | 1.7.0_25 |
修改nginx.conf加上：
- upstream backend {
- server 10.10.49.23:8080 max_fails=1 fail_timeout=10s;
- server 10.10.49.15:8081 max_fails=1 fail_timeout=10s;
- }
- location / {
- root html;
- index index.html index.htm;
- proxy_pass http://backend;
- }
启动nginx。
下载tomcat-redis-session-manager相应的jar包，主要有三个：
wget https://github.com/downloads/jcoleman/tomcat-redis-session-manager/tomcat-redis-session-manager-1.2-tomcat-7-java-7.jar
wget http://central.maven.org/maven2/redis/clients/jedis/2.5.2/jedis-2.5.2.jar
wget http://central.maven.org/maven2/org/apache/commons/commons-pool2/2.0/commons-pool2-2.0.jar
下载完成后拷贝到$TOMCAT_HOME/lib中
修改两tomcat的context.xml:
- <Context>
- <!-- Default set of monitored resources -->
- <WatchedResource>WEB-INF/web.xml</WatchedResource>
- <!-- Uncomment this to disable session persistence across Tomcat restarts -->
- <!--
- <Manager pathname="" />
- -->
- <!-- Uncomment this to enable Comet connection tacking (provides events
- on session expiration as well as webapp lifecycle) -->
- <!--
- <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
- -->
- <Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
- <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
- host="10.10.49.20"
- port="6379"
- database="0"
- maxInactiveInterval="60" />
- </Context>
在tomcat/webapps/test放一个index.jsp
- <%@ page language="java" %>
- <html>
- <head><title>TomcatA</title></head>
- <body>
- <table align="centre" border="1">
- <tr>
- <td>Session ID</td>
- <td><%= session.getId() %></td>
- </tr>
- <tr>
- <td>Created on</td>
- <td><%= session.getCreationTime() %></td>
- </tr>
- </table>
- </body>
- </html>
- sessionID:<%=session.getId()%>
- <br>
- SessionIP:<%=request.getServerName()%>
- <br>
- SessionPort:<%=request.getServerPort()%>
- <%
- //为了区分，第二个可以是222
- out.println("This is Tomcat Server 1111");
- %>
启动tomcat，发现有异常：com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve 类找不到
分别打开三个jar包，确实没有这个类，解决可以参考：
http://blog.csdn.net/qinxcb/article/details/42041023
通过访问http://10.10.49.20/test/
刷新：
可以看到虽然Server从1111变为2222，但session的创建时间没有变化，这就完成了session共享。
1，安装redis并配置和启动, tomcat也做相就的下载，其他地方都有，可以在其他地方查阅。
2, 获取tomcat依赖包：
Tomcat使用 从https://github.com/xetorthio/jedis/downloads下载jedis作为java的redis客户端，
从https://github.com/jcoleman/tomcat-redis-session-manager/downloads下载tomcat的redis session manager插件
从http://commons.apache.org/proper/commons-pool/download_pool.cgi下载apache的common pool2包，2.2，将这几个jar包拷贝到tomcat7的lib目录下
包有： redis2.8、jedis.jar、common-pool2.2.jar、tomcat-redis-session-manager-1.2-tomcat-7.jar
3 配置 tomcat
在https://github.com/jcoleman/tomcat-redis-session-manager 这里面文章看到的配置为：
<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
host="localhost" <!-- optional: defaults to "localhost" -->
port="6379" <!-- optional: defaults to "6379" -->
database="0" <!-- optional: defaults to "0" -->
maxInactiveInterval="60" <!-- optional: defaults to "60" (in seconds) -->
sessionPersistPolicies="PERSIST_POLICY_1,PERSIST_POLICY_2,.." <!-- optional -->
sentinelMaster="SentinelMasterName" <!-- optional -->
sentinels="sentinel-host-1:port,sentinel-host-2:port,.." <!-- optional --> />
而下载的包tomcat-redis-session-manager-1.2-tomcat-7-java-7.jar或tomcat-redis-session-manager-1.2-tomcat-7.jar
4 相关包的里面并没有类：com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve
所以从https://github.com/jcoleman/tomcat-redis-session-manager直接下载源码：
发现源码里面存在相应的类，同时源码（tomcat-redis-session-manager）依赖了tomcat其他的包：tomcat-juli.jar
而tomcat默认是没有这些包的，从http://mirrors.cnnic.cn/apache/tomcat/tomcat-7/v7.0.57/bin/extras/ 下载tomcat-juli-adapters.jar和tomcat-juli.jar两个包，放在apache-tomcat-7.0.57\lib目录下，同时将tomcat-juli.jar放在apache-tomcat-7.0.57\bin目录下
同时将编译tomcat-redis-session-manager的源码，通过相应的依赖包common-pool2.2，jedis以及tomcat-juli.jar编译，
并打成自己的jar包，我已经上传在：
http://download.csdn.net/detail/qinxcb/8279761
然后将这个依赖包放在apache-tomcat-7.0.57\lib目录下，删除网上下载的tomcat-redis-session-manager-1.2-tomcat-7.jar.
http://blog.csdn.net/qinxcb/article/details/42041023
