开机启动设置U盘直接安装， 不修改配置文件。 直接在安装时设置里打开网络，九可以跳过第 4 条。
service network restart
yum -y install net-tools
yum -y install wget
Set Up Subdomains with Apache Virtual Hosts
Some people are unaware that the “www” part of the URL is actually a subdomain (http://www.example.com), and can (in theory) point to a different location than http://example.com - it is not advised that you use www as an active sudomain, as most people expect both example.com and www.example.com to have the same content.
This is actually the basis for canonicalisation, but that’s another blog post altogether
So how do we set up subdomains using Apache virtual hosts? It’s actually very simple, we just need to configure two things, follow this guide for a very simple apache subdomain virtual host example: Apache Virtual Host Configuration File