CentOS7.x 报错 There are no enabled repos.

地址 ：http://mirrors.163.com/centos/7/os/x86_64/Packages/
 
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/centos-release-7-4.1708.el7.centos.x86_64.rpm 
rpm -ivh --replacepkgs --replacefiles centos-release-7-4.1708.el7.centos.x86_64.rpm 
yum update

http://mirrors.163.com/centos/7/os/x86_64/Packages/

文章来自：https://www.cnblogs.com/Amos-Turing/p/8315922.html