CentOS6.8下载，CentOS 6.8 iso下载，CentOs7下载
参考：
6.8
https://man.linuxde.net/download/CentOS_6_8
7
http://isoredirect.centos.org/centos/7/isos/x86_64/
参考：
6.8
https://man.linuxde.net/download/CentOS_6_8
7
http://isoredirect.centos.org/centos/7/isos/x86_64/