centos7 修改yum源为阿里源

# 备份旧配置信息
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

# 下载阿里云源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

# 更新yum源
yum makecache
yum repolist

Linux 修改yum源为国内镜像