centos快速配置yum源

cd /etc/yum.repo.d/

mkdir allbak

mv * allbak/

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

来源：https://www.cnblogs.com/cou1d/p/12401636.html