Nginx+Tomcat+Memcached共享session集群配置

1、采用Nginx负载均衡
2、memcached共享session
3、tomcat集群配置(3台CentOS 6)
 
(172.18.188.64): 操作系统CentOS 6; 安装nginx、memcached和tomcat 6
(172.18.188.76): 操作系统CentOS 6; 安装tomcat 6
(172.18.188.78): 操作系统CentOS 6; 安装tomcat 6
 
nginx、memcached、tomcat 6安装省略.
 
nginx配置如下:
 
nginx.conf如下:
#运行nginx所在的用户名和用户组
#user  root root;
 
#启动进程数
worker_processes 8;
#全局错误日志及PID文件
error_log /usr/local/webserver/nginx/logs/nginx_error.log crit;
 
pid /usr/local/webserver/nginx/nginx.pid;
 
#Specifies the value for maximum file descriptors that can be opened by this process.
 
worker_rlimit_nofile 65535;
#工作模式及连接数上限
events
{
  use epoll;
  worker_connections 65535;
}
#设定http服务器，利用它的反向代理功能提供负载均衡支持
http
{
  #设定mime类型
  include       mime.types;
  default_type  application/octet-stream;
  include /usr/local/webserver/nginx/conf/proxy.conf;
  #charset  gb2312;
  #设定请求缓冲  
  server_names_hash_bucket_size 128;
  client_header_buffer_size 32k;
  large_client_header_buffers 4 32k;
  #client_max_body_size 8m;
    
  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;
###禁止通过ip访问站点
#  server{
#       server_name _;
#       return 404;
#       }
 
upstream tserver {
    server 172.18.188.64:8080 weight=1;
    server 172.18.188.76:8080 weight=1;
    server 172.18.188.78:8080 weight=1;
}
 
  server
  {
    listen       80;
    server_name  vmwarehost;
    index index.html index.htm index.jsp;
    root  /home/www/web/ROOT;
 
    #limit_conn   crawler  20;  
   
    location /
    {
    proxy_pass http://tserver;
    } 
   
    location /NginxStatus
    {
      stub_status on;
      access_log off;
    }   
  
    location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|ico)$
    {
      expires      30d;
    }
 
    location