yum install yum-plugin-downloadonly将安装包及其依赖下载到本地
yum install --downloadonly vim # 默认保存到/var/cache/yum/ yum install --downloadonly --downloaddir=/root/mypackages/ vim # 将安装包默认下载到指定目录下Yumdownloader工具 安装yumdownliader工具
yum install yum-utils下载指定安装包
yumdownloader --resolve --destdir=/root/mypackages/ nginx
