CentOS从下载到安装

cenos下载地址：

1、官网：https://www.centos.org/download/

2、centos阿里汇总：https://yq.aliyun.com/zt/56604?spm=a2c4e.11155472.0.0.44aa2bb7A9iMel

3、网易镜像【推荐】：http://mirrors.163.com/

4、Centos国内下载源

http://mirrors.btte.net/centos/7/isos/x86_64/ 
http://mirrors.cn99.com/centos/7/isos/x86_64/ 
http://mirrors.sohu.com/centos/7/isos/x86_64/ 
http://mirrors.aliyun.com/centos/7/isos/x86_64/ 
http://centos.ustc.edu.cn/centos/7/isos/x86_64/ 
http://mirrors.neusoft.edu.cn/centos/7/isos/x86_64/ 
http://mirror.lzu.edu.cn/centos/7/isos/x86_64/ 
http://mirrors.163.com/centos/7/isos/x86_64/ 
http://ftp.sjtu.edu.cn/centos/7/isos/x86_64/