org https://www.redhat.com/ https://www.centos.org/
https://linux.oracle.com https://edelivery.oracle.com/osdc/faces/Home.jspx
https://www.debian.org/ https://www.ubuntu.com/
mirrors http://mirrors.sohu.com/ http://mirrors.tuna.tsinghua.edu.cn/ http://mirror.centos.org/
