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~~~ mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup ~~~ ~~~ wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo ~~~ ~~~ yum  clean  all ~~~ ~~~ yum makecache ~~~