CentOS-8源安装更新
参考博文:https://developer.aliyun.com/mirror/centos
rm /etc/yum.repos.d/CentOS-* 所有文件全部删除
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
yum clean all && yum makecache
yum upgrade && yum update
OK