Three ways to get RPM packages using yum

Sometimes you need a package offline linux Installation on system , If you find the software package troublesome , Sure linux yum Download the required software package , The preparatory work is to find one that can connect to the Internet linux, And ready yum And yum Source , Generally, we use our vmware linux Virtual machine is OK .
There are two ways ：
1、 commonly yum The tool comes with two parameters

--downloadonly        don't update, just download  // Only download 
--downloaddir=DLDIR   specifies an alternate directory to store packages // Download directory 

The command format is as follows , For example, I want to download screen packet To /root Catalog

yum install --downloadonly --downloaddir=/root screen

Finished , Look at the following ：

[[email protected] ~]# cd /root/
[[email protected] ~]# ll
total 568
-rw-r--r--  1 root root    264 Dec 30 03:16 90-eno-fix.rules
-rw-------. 1 root root    958 May 22  2017 anaconda-ks.cfg
-rw-r--r--  1 root root 565300 Apr 25  2018 screen-4.1.0-0.25.20120314git3c2946.el7.x86_64.rpm

Be careful ： This method will download the dependent packages you need when installing the software package , Isn't this great .

2、 use rpm Package download tool ：yumdownloader
install yumdownloader：

[[email protected] ~]# yum install yum-utils

download screen For example ：

[[email protected] ~]# yumdownloader screen

The default download is in the current directory , Of course, you can also make a download directory , Also use "–downloaddir" Parameters

[[email protected] ~]# ll
total 572
-rw-------. 1 root root    958 May 18  2017 anaconda-ks.cfg
-rwxr-xr-x  1 root root      5 Feb  7  2018 kel.1.txt
-rw-r--r--  1 root root 565300 Apr 25  2018 screen-4.1.0-0.25.20120314git3c2946.el7.x86_64.rpm
-rw-r--r--  1 root root    932 Feb  5  2018 xxx.txt
[[email protected] ~]# 

Be careful ： This way will not download what you want rpm The dependency package of , Just download the software package given in your command

another , Actually you yum Install or update Software , You can choose to install or update The software package of is reserved for download ,yum The general default configuration of is deleted , This can be modified yum The configuration file , Let install or update Save the package after , The following two parameters ：

[[email protected] yum.repos.d]# cat /etc/yum.conf
[main]
cachedir=/var/cache/yum/$basearch/$releasever   // Save the directory 
keepcache=0   //0 Do not save ,1 preservation 
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=23&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release

Last ：
Then you can enter the download directory and pass rpm The installation instructions are installed
install rpm package ：
Forced installation once ： rpm -ivh --force --nodeps *.rpm
Re execution ： rpm -ivh *.rpm