http://mirrors.aliyun.com/centos/8/isos/x86_64/
cd /etc/yum.repos.d/
rm -f CentOS-Base.repo CentOS-AppStream.repo CentOS-PowerTools.repo CentOS-centosplus.repo curl -o CentOS-Base.repo https://raw.githubusercontent.com/hackyoMa/docker-centos/8/CentOS-Base.repoyum makecache原文：https://www.cnblogs.com/kofsony/p/14074388.html