CentOS 更新 aliyun yum源

备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

目录

cd /etc/yum.repos.d/

下载

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

生成缓存和更新

yum clean all

yum makecache

yum -y update