下载yum源到本地

1、配置yum源
base wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
epel wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
2、装软件
yum install createrepo yum-utils -y
3、配置本地目录
mkdir -p /data
4、同步
yum repolist
reposync -r base -p /data