问题的产生，都是源于真实的需求。。。
01、yum安装切保存rpm包于本地
[root@yhs_web_1 ~]# vim /etc/yum.conf [main]
cachedir=/var/cache/yum/$basearch/$releasever #保存路径
keepcache=1 #开启保存
debuglevel=
logfile=/var/log/yum.log
exactarch=
obsoletes=
gpgcheck=
plugins=
installonly_limit=
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=16&ref=http://bugs.centos.org/bug_report
_page.php?category=yumdistroverpkg=centos-release # This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
# It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# metadata_expire=90m # PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
02、下载指定rpm包，不安装
yum install -y yum-utils #yumdownloade
yumdownloade openssh #下载切保存到本地
03、下载rpm包切下载依赖相关包，不安装
yum -y install yum-downloadonly #yum 插件
yum -y install --downloadonly --downloaddir=/tmp/ vlock
--downloadongly 仅仅下载
--downloaddir 指定保存目录
yum-downloadonly:
链接: https://pan.baidu.com/s/1i5L4NOx 密码: 99tb