CentOS7 修改yum源爲阿里雲

1，登錄root賬號 2，cd /etc/yum.repo.d 3，mv CentOS-Base.repo CentOS-Base.repo.bak 4，wget http://mirrors.aliyun.com/repo/Centos-7.repo 5，mv Centos-7.repo CentOS-Base.repo 6， yum clean all 7， yum makecac

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