安装apache,php:
yum install httpd php

假设VPS的IP是58.130.17.168，有两个域名指向该IP，分别是domain1.com, domain2.com,

修改/etc/httpd/conf/httpd.conf，在文件的最后加入：

ServerName 58.130.17.168
NameVirtualHost 58.130.17.168

VirtualHost 58.130.17.168>
        ServerName domain1.com
        DocumentRoot /var/www/domain1.com
        Directory "/var/www/domain1.com">
            Options Indexes FollowSymLinks
            AllowOverride None
            Order allow,deny
            Allow from all
        /Directory>
/VirtualHost>

VirtualHost 58.130.17.168>
        ServerName domain2.com
        DocumentRoot /var/www/domain2.com
        Directory "/var/www/domain2.com">
            Options Indexes FollowSymLinks
            AllowOverride None
            Order allow,deny
            Allow from all
        /Directory>
/VirtualHost>

然后在/var/www/domain1.com和/var/www/domain2.com下创建不同的index.html文件：
echo "domain1">/var/www/domain1.com/index.html
echo "domain2">/var/www/domain2.com/index.html

在浏览器里输入http://domain1.com和http://domain2.com即可看到效果了