备份源
mv CentOS-Linux-Base.repo CentOS-Linux-Base.repo.bak
下载镜像源配置
wget http://mirrors.aliyun.com/repo/Centos-8.rep
修改镜像源
vim CentOS-Base.repo
# vim命令模式下执行
%s/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g
%s/$releasever/$releasever-stream/g
mv CentOS-Linux-Base.repo CentOS-Linux-Base.repo.bak
wget http://mirrors.aliyun.com/repo/Centos-8.rep
vim CentOS-Base.repo
# vim命令模式下执行
%s/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g
%s/$releasever/$releasever-stream/g