CentOS修改yum源
cd /etc/yum.repos.d
sudo mv CentOS-Base.repo CentOS-Base.repo.backup
sudo wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
sudo yum clean all
sudo yum makecache
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iPhone请用自带相机扫
安卓用UC/QQ浏览器扫
