大家都知道Centos8于2021年年底停止了服务，大家再在使用yum源安装时候，
出现下面错误“错误：Failed to download metadata for repo ‘AppStream’:
Cannot prepare internal mirrorlist: No URLs in mirrorlist”
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
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
即可更新yum源了
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标签：CentOS,centos,repos,repo,mirrorlist,yum,linux From： https://www.cnblogs.com/shixiangqian/p/17981086