centos7更换yum源为阿里云源

#备份
cd /etc/yum.repos.d
mkdir bak
mv *.repo bak
#下载阿里云源
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

#修改Centos-7.repo

sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo
#清空并重建缓存
yum clean all
yum makecache fast
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