鲲鹏版本（arm架构）镜像

https://archive.kernel.org/centos-vault/altarch/
Centos7.6 .1810地址如下

https://archive.kernel.org/centos-vault/altarch/7.6.1810/isos/aarch64/
普通centos版本官网地址如下

Index of /centos-vault/centos/

例如：centos7.8官网下载

Index of /centos-vault/centos/7.8.2003/isos/x86_64/

 centos7.9下载

http://ftp.sjtu.edu.cn/centos/7.9.2009/isos/x86_64/

国内下载地址收集如下

http://man.linuxde.net/download/CentOS
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/