Centos7 换源 yum 阿里源
备份原来的源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载阿里的yum源
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
更新一下
yum update
https://blog.51cto.com/u_15119353/5058467