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Yum Plugins

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Yum  provides plugins that extend and enhance its operations. Certain plugins are installed by default. Yum always informs you which plugins, if any, are loaded and active whenever you call any yum command: 

~]# yum info yum
Loaded plugins: presto, refresh-packagekit, security
[output truncated]
Note that the plugin names which follow Loaded plugins are the names you can provide to the --disableplugins=<plugin_name> option.

 Enabling, Configuring and Disabling Yum Plugins

 To enable Yum plugins, ensure that a line beginning with plugins= is present in the [main] section of /etc/yum.conf, and that its value is set to 1:
plugins=1
You can disable all plugins by changing this line to plugins=0.

Disabling plugins is not advised

Disabling all plugins is not advised because certain plugins provide important Yum services. In particular, rhnplugin enables connecting to Red Hat Network, and the security plugin allows system administrators to easily update the system with (sometimes critical) security updates. Disabling plugins globally is provided as a convenience option, and is generally only recommended when diagnosing a potential problem with Yum.

Every installed plugin has its own configuration file in the /etc/yum/pluginconf.d/ directory. You can set plugin-specific options in these files. For example, here is the security plugin's security.conf configuration file:

Example 1.7. A minimal Yum plugin configuration file
[main]
enabled=1
Plugin configuration files always contain a [main] section (similar to Yum's /etc/yum.conf file) in which there is (or you can place if it is missing) an enabled= option that controls whether the plugin is enabled when you run yum commands.

If you disable all plugins by setting enabled=0 in /etc/yum.conf, then all plugins are disabled regardless of whether they are enabled in their individual configuration files.

If you merely want to disable all Yum plugins for a single yum command, use the --noplugins option.

If you simply want to disable one or more Yum plugins for a single yum command, then you can add the --disableplugin=<plugin_name> option to the command:

Example 1.8. Disabling the presto plugin while running yum update
 yum update --disableplugin=presto
 
The plugin names you provide to the --disableplugin= option are the same names listed after the Loaded plugins: line in the output of any yum command. You can disable multiple plugins by separating their names with commas. In addition, you can match multiple similarly-named plugin names or simply shorten long ones by using glob expressions: --disableplugin=presto,refresh-pack*.

 Installing More Yum Plugins

Yum plugins usually adhere to the yum-plugin-<plugin_name> package-naming convention, but not always: the package which provides the presto plugin is named yum-presto, for example. You can install a Yum plugin in the same way you install other packages:
yum install yum-downloadonly 

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How To Download a RPM Package Using yum Command Without Installing On Linux

I would like to only download the packages via yum and not install/update them. How do I download a RPM package using yum command under CentOS Enterprise Linux server 5.x or RHEL 5.x systems?

You need to install plugin called yum-downloadonly. This plugin adds a --downloadonly flag to yum so that yum will only download the packages and not install/update them. Following options supported by this plugin:

[a] --downloadonly : don't update, just download a rpm file
[b] --downloaddir=/path/to/dir : specifies an alternate directory to store packages such as /tmp

Please note following instructions are only tested on CentOS server but should work with RHN and RHEL without any problem.

How do I download a RPM package only from RHN or CentOS mirror, without installing it?

Download httpd package but don't install/update, enter:
# yum update httpd -y --downloadonly
By default package will by downloaded and stored in /var/cache/yum/ directory. But, you can specifies an alternate directory to store packages such as /opt, enter:
# yum update httpd -y --downloadonly --downloaddir=/opt
Sample output:

yum install httpd -y --downloadonly
Loading "downloadonly" plugin
Loading "fastestmirror" plugin
Loading "security" plugin
Loading mirror speeds from cached hostfile
 * base: centos.mirrors.mypsh.com
 * updates: mirror.steadfast.net
 * addons: mirrors.gigenet.com
 * extras: holmes.umflint.edu
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package httpd.i386 0:2.2.3-11.el5_1.centos.3 set to be updated
filelists.xml.gz          100% |=========================| 2.8 MB    00:03
filelists.xml.gz          100% |=========================| 681 kB    00:11
filelists.xml.gz          100% |=========================| 122 kB    00:00
filelists.xml.gz          100% |=========================|  150 B    00:00
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 httpd                   i386       2.2.3-11.el5_1.centos.3  base              1.1 M
Transaction Summary
=============================================================================
Install      1 Package(s)
Update       0 Package(s)
Remove       0 Package(s)
Total download size: 1.1 M
Downloading Packages:
(1/1): httpd-2.2.3-11.el5 100% |=========================| 1.1 MB    00:01
exiting because --downloadonly specified

To see downloaded file, enter:
# ls -l /opt/*.rpm
Sample output:

-rw-r--r-- 1 root root 1116426 Jan 17 03:36 /opt/httpd-2.2.3-11.el5_1.centos.3.i386.rpm
-rw-r--r-- 1 root root   83452 Oct  2  2007 /opt/lighttpd-fastcgi-1.4.18-1.el5.rf.i386.rpm
-rw-r--r-- 1 root root  635045 Oct 20  2007 /opt/psad-2.1-1.i386.rpm

Method # 2: yum-utils.noarch Package

yum-utils is a collection of utilities and examples for the yum package manager. It includes utilities by different authors that make yum easier and more powerful to use. These tools include: debuginfo-install, package-cleanup, repoclosure, repodiff, repo-graph, repomanage, repoquery, repo-rss, reposync, repotrack, verifytree, yum-builddep, yum-complete-transaction, yumdownloader, yum-debug-dump and yum-groups-manager.
# yum -y install yum-utils.noarch

Now use the yumdownloader command which is a program for downloading RPMs from Yum repositories. Type the following command to download httpd rpm file:
# yumdownloader httpd



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Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

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