高性能网站架构之负载均衡 Nginx+tomcat+redis实现tomcat集群

需要注意的问题：

不同机器上的jsessionid的碰撞问题，超时问题？redis的集群问题，出现问题

git:参考

• https://github.com/jcoleman/tomcat-redis-session-manager
• https://github.com/ameizi/DevArticles/issues/123

<Context>
    <Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
    <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
           host="localhost"
           port="6379"
           database="0"
           maxInactiveInterval="60" />
</Context>

Nginx

worker_processes  1;  

#error_log logs/error.log;  
#error_log logs/error.log  notice;  
#error_log logs/error.log  info;  

#pid       logs/nginx.pid;  


events {  
   #use   epoll;             #epoll是多路复用IO(I/OMultiplexing)中的一种方式,但是仅用于linux2.6以上内核,可以大大提高nginx的性能  
   worker_connections  1024;  #单个后台work processes 进程最大的并发连接数  
}  


http {  
   include       mime.types;  
   default_type application/octet-stream;  

   #log_format  main  '$remote_addr - $remote_user [$time_local]"$request" '  
   #                  '$status$body_bytes_sent "$http_referer" '  
   #                 '"$http_user_agent" "$http_x_forwarded_for"';  

   #access_log  logs/access.log  main;  

   sendfile        on;  
   #tcp_nopush     on;  
    #设置超时时间  
   #keepalive_timeout  0;  
   keepalive_timeout  65;  
   #要代理的服务器的地址和端口号    weight 为权重，权重越大 被访问的次数越多， 压力越大！  
  upstream myServer {  

   server 192.168.20.128:8080;  
   server 192.168.20.129:8080 weight=2;  
   }  

   #gzip  on;  
    #监听80 端口  
   server {  
       listen       80;  
       #定义要使用的域名  
       server_name  localhost;  

       #charset koi8-r;  
      #设定本虚拟主机的访问日志  
       #access_log logs/host.access.log  main;  
       #配置前缀  即要转发到的ip+port  
       location / {  
           proxy_pass  http://myServer;  
          # root   html;  
          # index  index.html index.htm;  
       }  

       #error_page  404              /404.html;  

       # redirect server error pages to the static page /50x.html  
       #  
       error_page   500 502 503 504  /50x.html;  
       location = /50x.html {  
           root   html;  
       }  
    }  
}