...    #全局块
 
events {   #events块
 ...
}
 
http  #http块
{
 ... #http全局块
 server  #server块
 { 
  ...  #server全局块
  location [PATTERN] #location块
  {
   ...
  }
  location [PATTERN] 
  {
   ...
  }
 }
 server
 {
  ...
 }
 ...  #http全局块
}

#1、全局块：配置影响nginx全局的指令。一般有运行nginx服务器的用户组，nginx进程pid存放路径，日志存放路径，配置文件引入，允许生成worker process数等。
#user  nobody;
worker_processes  1;
#2、events块：配置影响nginx服务器或与用户的网络连接。有每个进程的最大连接数，选取哪种事件驱动模型处理连接请求，是否允许同时接受多个网路连接，开启多个网络连接序列化等。
events {
    worker_connections  1024;#每个进程最大连接数1024
}

#3、http块：可以嵌套多个server，配置代理，缓存，日志定义等绝大多数功能和第三方模块的配置。如文件引入，mime-type定义，日志自定义，是否使用sendfile传输文件，连接超时时间，单连接请求数等。
http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;#连接超时时间
　　#4、server块：配置虚拟主机的相关参数，一个http中可以有多个server
    server {
        listen       80;
        server_name  localhost;
　　　　#5、location块：配置请求的路由，以及各种页面的处理情况
        location / {
            root   html;
            index  index.html index.htm;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
    
}

#user  nobody;
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 {
    worker_connections  1024;
}


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;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    upstream manager.e3mall.cn {
    server 192.168.25.137:8080;
    }
    upstream www.e3mall.cn {
    server 192.168.25.137:8081;
    }
    upstream search.e3mall.cn {
    server 192.168.25.137:8082;
    }
    upstream item.e3mall.cn {
    server 192.168.25.138:8080;
    }
    upstream sso.e3mall.cn {
    server 192.168.25.138:8081;
    }
    upstream cart.e3mall.cn {
    server 192.168.25.139:8080;
    }
    upstream order.e3mall.cn {
    server 192.168.25.139:8081;
    }
    
   server {
        listen       80;
        server_name  manager.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://manager.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  www.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://www.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  search.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://search.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  item.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://item.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  sso.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://sso.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  cart.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://cart.e3mall.cn;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  order.e3mall.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://order.e3mall.cn;
            index  index.html index.htm;
        }
    }
    

    

}