阿里云多个二级域名，解析到同一个机器外网ip地址： 

http://demo.xxx.com.cn/

 http://yang.xxx.com.cn/

nginx.conf 配置文件：

server{listen 80;server_name yang.xxx.com.cn;# 第1个二级域名映射80端口index index.html index.htm index.php;root  /www/server/phpmyadmin-yang;#error_page   404   /404.html;include enable-php.conf;location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)${expires      30d;}location ~ .*\.(js|css)?${expires      12h;}location ~ /\.{deny all;}access_log  /www/wwwlogs/access.log;}server{listen 80;server_name demo.xxx.com.cn;# 第2个二级域名映射80端口index index.html index.htm index.php;root  /www/server/phpmyadmin-demo;#error_page   404   /404.html;include enable-php.conf;location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)${expires      30d;}location ~ .*\.(js|css)?${expires      12h;}location ~ /\.{deny all;}access_log  /www/wwwlogs/access.log;}