枫の屋

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cd /etc/yum.repos.d/

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mv CentOS-Linux-Base.repo CentOS-Linux-Base.repo.bak

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wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

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#首先输入：
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%s/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g
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#回车后，再次按“冒号”后，输入：
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%s/$releasever/$releasever-stream/g
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#回车，然后再按“冒号”后输入保存命令：
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wq

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错误：为 repo ‘appstream‘ 下载元数据失败 : Cannot prepare internal mirrorlist: No URLs in mirrorlist

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baseurl=https://mirrors.aliyun.com/centos/$releasever-stream/extras/$basearch/os/

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#清理
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yum clean all
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#生成缓存
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yum makecache