1.安装memcached内存数据库

yum –y install memcached

可以用telnet localhost 11211

Set abc 0 0 5

12345

get abc

2.web服务器连接memcached的jar包拷贝到tomcat的lib

3.修改server.xml里面修改Engine标签，添加jvmRoute属性，目的是查看sessionid里面带有tomcat的名字，就是这里配置的jvmRoute

<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">

4.配置tomcat的conf目录下的context.xml

<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"

       memcachedNodes="n1:192.168.17.9:11211


"  sticky="false"

   lockingMode="auto"

   sessionBackupAsync="false"

       requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"

sessionBackupTimeout="1000" transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory" />

配置memcachedNodes属性，配置memcached数据库的ip和端口，默认11211，多个的话用空格隔开

目的？让tomcat服务器从memcached缓存里面拿session或者是放session

5.修改index.jsp，取sessionid看一看

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%>

<html lang="en">

SessionID:<%=session.getId()%>

</br>

SessionIP:<%=request.getServerName()%>

</br>

<h1>tomcat1</h1>

</html>