Nginx+Tomcat+Memcached实现tomcat集群和session共享

一、Nginx安装

  详见前文:http://www.cnblogs.com/yixiwenwen/p/3574097.html

二、memcached安装和启动

  详见前文:http://www.cnblogs.com/yixiwenwen/p/3574137.html

  

三、配置Nginx实现Tomcat的负载均衡和利用memcached实现session共享

1. 修改nginx的配置文件nginx.conf

user  nobody;
worker_processes 4;
error_log logs/error.log;
events {
worker_connections 1024;
} http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
gzip on;
upstream www.yixi.com {
server 192.168.137.46:100;
server 192.168.137.46:101;
        server  192.168.137.46:102;
        
}
server {
listen 80;
server_name www.yixi.com;
charset utf-8;
location / {
root html;
index index.html index.htm;
proxy_pass http://www.yixi.com;
proxy_set_header X-Real-IP $remote_addr;
client_max_body_size 100m;
} location ~ ^/(WEB-INF)/ {
deny all;
} error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
} }
}

2. Tomcat配置

下载并解压三个tomcat7;

下载相应的jar包到所有的tomcat的lib目录下:

couchbase-client-1.2.2.jar

javolution-5.4.3.1.jar

memcached-session-manager-1.6.4.jar

memcached-session-manager-tc7-1.6.4.jar

msm-javolution-serializer-1.6.4.jar

msm-kryo-serializer-1.6.4.jar

msm-xstream-serializer-1.6.4.jar

spymemcached-2.10.2.jar

下面修改Tomcat配置文件,让Tomcat结合memcached实现session共享
[root@localhost lib]# vi /usr/local/tomcat/conf/context.xml
在配置文件中的<context></context>标签里面加入如下内容:

<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="n1:localhost:11211"
requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$"
sessionBackupAsync="false"
sessionBackupTimeout="100"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
copyCollectionsForSerialization="false" />

为了测试在tomcat默认的webroot下的index.jsp中加入这些代码:

SessionID:<%=session.getId()%>
<BR>
SessionIP:<%=request.getServerName()%>
<BR>
SessionPort:<%=request.getServerPort()%>
<%
out.println("This is Tomcat Server 111111!");
%>

(备注:当要同时启动多个tomcat时需要修改一些配置

  a.修改/etc目录下的profile文件:  

export CATALINA_HOME_test_1=/usr/local/tomcat_test/apache-tomcat-7-1
export CATALINA_HOME_test_2=/usr/local/tomcat_test/apache-tomcat-7-2
export CATALINA_HOME_test_3=/usr/local/tomcat_test/apache-tomcat-7-3

  b. 修改bin下的startup.sh和shutdown.sh

  添加 export CATALINA_HOME=$CATALINA_2_HOME  利用profile中第二组设置

4.测试结果:

分别启动nginx memcached tomcat

将host的文件中映射www.yixi.com到自己的ip;

在浏览器中访问www.yixi.com

Nginx+Tomcat+Memcached实现tomcat集群和session共享

访问的的是tomcat3 此时sessionID是:598EA38832CA14F8F14AC3EF0276AD3D-n1

刷新几次发现访问的还是tomcat3,

为了测试 先杀死tomcat3的进程!

Nginx+Tomcat+Memcached实现tomcat集群和session共享

再刷新...

Nginx+Tomcat+Memcached实现tomcat集群和session共享

发现当tomcat3挂掉之后 请求就到了tomcat1 并且我们希望的sessionId还是598EA38832CA14F8F14AC3EF0276AD3D-n1

再把tomcat1挂掉试试:

测试结果:

Nginx+Tomcat+Memcached实现tomcat集群和session共享

只剩下tomcat2还能用 而且sessionId是共享的。

这样整个配置和测试就完成了

附件:

tomcat部分:http://download.csdn.net/detail/yixiwenwen/6986845

nginx.conf :http://download.csdn.net/detail/yixiwenwen/6986719

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