CentOS8 yum/dnf 配置国内源

# file: /etc/yum.repos.d/CentOS-AppStream.repo

[AppStream]
name=CentOS-$releasever - AppStream
baseurl=http://mirrors.aliyun.com/centos/$releasever/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

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# file: /etc/yum.repos.d/CentOS-Base.repo

[BaSEOS]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos/$releasever/BaSEOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
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# file: /etc/yum.repos.d/CentOS-Epel.repo

[epel]
name=CentOS-$releasever - Epel
baseurl=http://mirrors.aliyun.com/epel/8/Everything/$basearch
enabled=1
gpgcheck=0
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# file: /etc/yum.repos.d/CentOS-Media.repo

[c8-media-BaSEOS]
name=CentOS-BaSEOS-$releasever - Media
baseurl=file:///media/CentOS/BaSEOS/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
[c8-media-AppStream]
name=CentOS-AppStream-$releasever - Media
baseurl=file:///media/CentOS/AppStream/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
注：CentOS-Media 配置需要将光盘挂载至/media/CentOS路径，否则在使用时会报错。

然后执行如下命令：

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dnf clean all    # 清除所有的缓存文件
dnf makecache    # 制作元数据缓存