centos8的yum源

[baseos]
name=CentOS-Stream-8 - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/8-stream/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[appstream]
name=CentOS-Stream-8 - AppStream
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/8-stream/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

注意：需要将将文件夹（/etc/yum.repos.d/）下的其他文件全部删掉，只保留一个（CentOS-Base.repo）即可，不然会走一些其他的额外配置