rename '.repo' '.repo.bak' /etc/yum.repos.d/CentOS*.repo
curl -o /etc/yum.repos.d/Centos-vault-8.5.2111.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
curl -o /etc/yum.repos.d/epel-archive-8.repo https://mirrors.aliyun.com/repo/epel-archive-8.repo
yum clean all && yum makecache
推荐用这个软件:http://www.windowscool.com/show/?id=Njk2
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