网址：https://github.com/hackyoMa/docker-centos/blob/8/CentOS-Base.repo
使用方法：
cd /etc/yum.repos.d/
rm -f CentOS-Base.repo CentOS-AppStream.repo CentOS-PowerTools.repo CentOS-centosplus.repo CentOS-Extras.repo
curl -o CentOS-Base.repo https://raw.githubusercontent.com/hackyoMa/docker-centos/8/CentOS-Base.repo
yum makecache