user  www www;

worker_processes 8;

error_log  /data1/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 51200;

events 
{
 use epoll;
 worker_connections 51200;
}

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

 #charset  utf-8;
     
 server_names_hash_bucket_size 128;
 client_header_buffer_size 32k;
 large_client_header_buffers 4 32k;
     
 sendfile on;
 #tcp_nopush     on;

 keepalive_timeout 30;

 tcp_nodelay on;
 
 #注：proxy_temp_path和proxy_cache_path指定的路径必须在同一分区
 proxy_temp_path /data0/proxy_temp_path;
 #设置Web缓存区名称为cache_one，内存缓存空间大小为500MB，自动清除超过1天没有被访问的缓存数据，硬盘缓存空间大小为30GB。
 proxy_cache_path  /data0/proxy_cache_path  levels=1:2   keys_zone=cache_one:200m inactive=1d max_size=30g;

 upstream my_server_pool {
   server   192.168.1.2:80 weight=1 max_fails=2 fail_timeout=30s;
   server   192.168.1.3:80 weight=1 max_fails=2 fail_timeout=30s;
   server   192.168.1.4:80 weight=1 max_fails=2 fail_timeout=30s;
 }
 
 server
 {
   listen       80;
   server_name  my.domain.com;

   location /
   {
        proxy_set_header Host  $host;
        proxy_set_header X-Forwarded-For  $remote_addr;
        proxy_pass http://my_server_pool;
   }

   location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|js|css)$
   {
        #使用Web缓存区cache_one
        proxy_cache cache_one;
        
        #对不同HTTP状态码缓存设置不同的缓存时间
        proxy_cache_valid  200 304 12h;
        proxy_cache_valid  301 302 1m;
        proxy_cache_valid  any 1m;
        
        #设置Web缓存的Key值，Nginx根据Key值md5哈希存储缓存，这里根据“域名、URI、参数”组合成Key。
        proxy_cache_key $host$uri$is_args$args;
        
        #反向代理，访问后端内容源服务器
        proxy_set_header Host  $host;
        proxy_set_header X-Forwarded-For  $remote_addr;
        proxy_pass http://my_server_pool;
   }  
   
   #用于清除缓存，假设一个URL为http:// my.domain.com/test.gif，通过访问http://my.domain.com/purge/test.gif就可以清除该URL的缓存。
   location ~ /purge(/.*)
   {
        #设置只允许指定的IP或IP段才可以清除URL缓存。
        allow            127.0.0.1;
        allow            192.168.0.0/16;
        deny            all;
        proxy_cache_purge    cache_one   $host$1$is_args$args;
   } 

   access_log  off;
 }
}