将CentOS默认yum源更换为阿里云镜像

CentOS 7

yum install -y wget && mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup && wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

CentOS 8

yum install -y wget && mv /etc/yum.repos.d/CentOS-Linux-BaseOS.repo /etc/yum.repos.d/CentOS-Base.repo.backup && wget -O /etc/yum.repos.d/CentOS-Linux-BaseOS.repo http://mirrors.aliyun.com/repo/Centos-8.repo