服务器yum源更新为阿里云yum源

1 备份下原来的yum源

cd /etc/yum.repos.d/

mv CentOS-Base.repo CentOS-Base.repo_bak
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2 获取阿里云yum源

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
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3 清除缓存

yum clean all
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4 生成缓存

yum makecache