wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
或者
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all
yum makecache
yum repolist
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
扩展阅读
https://www.cnblogs.com/dennisdong/p/17037248.html
https://luogoddes.github.io/Hexo/2024/07/12/CentOS7%E5%B0%86yum%E6%BA%90%E6%9B%B4%E6%8D%A2%E4%B8%BA%E5%9B%BD%E5%86%85%E6%BA%90%E4%BF%9D%E5%A7%86%E7%BA%A7%E6%95%99%E7%A8%8B/
https://blog.csdn.net/Coin_Collecter/article/details/130071493
https://blog.csdn.net/qq_45156021/article/details/140317134
https://blog.csdn.net/qq_34777982/article/details/140119407
https://www.cnblogs.com/ayers/p/14779311.html
Linux 下的文章
https://www.8kiz.cn/category/Linux/
