VirtualBox 创建Centos7并配置网络NAT+Host-Only

安装VirtualBox：https://baijiahao.baidu.com/s?id=1617088883237334113&wfr=spider&for=pc

安装Centos7：https://blog.youkuaiyun.com/maty_wang/article/details/79127718

设置Host-Only：https://blog.youkuaiyun.com/dkfajsldfsdfsd/article/details/79441874

配置NAT+Host-Only：https://yq.aliyun.com/articles/674033  +  https://blog.youkuaiyun.com/ZopaulCode/article/details/80357961

设置阿里云的yum 源：https://www.cnblogs.com/lpbottle/p/7875400.html