关于虚拟主机server 的 listen 、server_name 配置：

• listen 对应nginx虚拟主机对外提供服务的端口
• server_name 可以理解成虚拟主机的名字，这个值会和http请求里的Host header做匹配
  
  所以
  1、在同一个nginx.conf配置文件里，只要 listen 、server_name组合起来唯一就没有问题；

#user  nobody;
worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;    
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        server_name  localhost;        
        location / {
            root   html;
            index  index.html index.htm;
        }        
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }        
    }

    server {
        listen       80;
        server_name  www.nginxo.com;      
        location / {
            root   html;
            index  index2.html index2.htm;
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

2、server_name 这一行可以配置多个，中间用空格隔开，例如：

server {
        listen       80;
        server_name  www.nginxo.com www.nginxp.com;        

        location / {
            root   html;
            index  index1.html
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }       
    }

3、server_name 也可以配置通配符

server {
        listen       80;
        server_name  *.nginxo.com;        

        location / {
            root   html;
            index  index1.html
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }       
    }

4、server_name 也可以配置正则
用 ~ 符号表示正则匹配

server {
        listen       80;
        server_name  ~^[0-9]+\.nginxo\.com$; 

        location / {
            root   html;
            index  index1.html
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

server_name 匹配规则

从上到下，匹配到后不再继续匹配