Nginx+tomcat负载均衡session问题解决

 测试环境：
 server1 服务器上安装了 nginx + tomcat01
 server2 服务器上只安装了 tomcat02
 server1 IP 地址：  192.168.2.88
 server2 IP 地址：  192.168.2.89
 安装步骤：
 1. 在server1 上安装配置 nginx + nginx_upstream_jvm_route
 shell $> wget -c http://sysoev.ru/nginx/nginx-0.7.61.tar.gz
 shell $> svn checkout http://nginx-upstream-jvm-route.googlecode.com/svn/trunk/ nginx-upstream-jvm-route-read-only
 shell $> tar zxvf nginx-0.7.61
 shell $> cd nginx-0.7.61
 shell $> patch -p0 < ../nginx-upstream-jvm-route-read-only/jvm_route.patch
 shell $> useradd www
 shell $> ./configure --user=www --group=www --prefix=/usr/local//nginx --with-http_stub_status_module --with-http_ssl_module --add-module=/root/nginx-upstream-jvm-route-read-only
 shell $> make
 shell $> make install
 2.分别在两台机器上安装 tomcat和java （略）
 设置tomcat的server.xml, 在两台服务器的tomcat的配置文件中分别找到：
 "Catalina" defaultHost="localhost" >
 分别修改为：
 Tomcat01:
 "Catalina" defaultHost="localhost" jvmRoute="a">
 Tomcat02:
 "Catalina" defaultHost="localhost" jvmRoute="b">
 并在webapps下面建立aa文件夹，在里面建立要测试的index.jsp文件，内容如下：
 <%@ page language="java"import="java.util.*" pageEncoding="UTF-8"%>
 <%
 %>




 88


 <%out.print(request.getSession()) ;%>


 <%out.println(request.getHeader("Cookie")); %>



 两个tomcat一样只需要修改红色的部分
 分别启动两个tomcat
 3．设置nginx
 shell $> cd /usr/local/nginx/conf
 shell $> mv nginx.conf nginx.bak
 shell $> vi nginx.conf
 ## 以下是配置 ###
 user www www;
 worker_processes  4;
 error_log logs/nginx_error.log crit;
 pid /usr/local/nginx/nginx.pid;
 #Specifies the value  for maximum file descriptors that can be opened by  this process.
 worker_rlimit_nofile  51200;
 events
 {
 use epoll;
 worker_connections  2048;
 }
 http
 {
 upstream backend {
 server 192.168.2.88:8080 srun_id=a;
 server 192.168.2.89:8080 srun_id=b;
 jvm_route $cookie_JSESSIONID|sessionid reverse;
 }
 include mime.types;
 default_type application/octet-stream;
 #charset gb2312;
 charset UTF-8;
 server_names_hash_bucket_size  128;
 client_header_buffer_size 32k;
 large_client_header_buffers  4 32k;
 client_max_body_size 20m;
 limit_rate 1024k;
 sendfile on;
 tcp_nopush on;
 keepalive_timeout  60;
 tcp_nodelay on;
 fastcgi_connect_timeout  300;
 fastcgi_send_timeout  300;
 fastcgi_read_timeout  300;
 fastcgi_buffer_size 64k;
 fastcgi_buffers  4 64k;
 fastcgi_busy_buffers_size 128k;
 fastcgi_temp_file_write_size 128k;
 gzip on;
 #gzip_min_length 1k;
 gzip_buffers 4 16k;
 gzip_http_version  1.0;
 gzip_comp_level  2;
 gzip_types text/plain application/x-javascript text/css application/xml;
 gzip_vary on;
 #limit_zone crawler $binary_remote_addr 10m;
 server
 {
 listen 80;
 server_name 192.168.2.88;
 index index.html index.htm index.jsp;
 root /var/www;
 #location ~ .*\.jsp$
 location / aa/
 {
 proxy_pass http://backend;
 proxy_redirect off;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header Host $http_host;
 }
 location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
 {
 expires 30d;
 }
 location ~ .*\.(js|css)?$
 {
 expires 1h;
 }
 location /Nginxstatus {
 stub_status on;
 access_log off;
 }
 log_format access  '$remote_addr - $remote_user [$time_local] "$request" '
 '$status $body_bytes_sent "$http_referer" '
 '"$http_user_agent" $http_x_forwarded_for';
 # access_log off;
 }
 }
 4.测试
 打开浏览器，输入：http://192.168.2.88/aa/
 刷新了N次还都是88，也就是补丁起作用了，cookie 值也获得了，为了测试，我又打开了“遨游浏览器”（因为session 和 cookie问题所以从新打开别的浏览器），输入网址：
 http://192.168.2.88/aa/
 显示89，刷新N次后还是89，大家测试的时候如果有疑问可一把 nginx 配置文件的
 srun_id=a srun_id=b 去掉，然后在访问，就会知道页面是轮询访问得了！！