How to Enable, Disable and Install Yum Plug-ins?

YUM plug-ins are small programs that extend and improve the overall performance of the package manager. A few of them are installed by default, while many are not. Yum always notify you which plug-ins, if any, are loaded and active whenever you run any yum command.

 

To see all active plug-ins, run a yum command on the terminal. From the output below, you can see that the fastestmirror plug-in is loaded.

# yum search nginx

Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Determining fastest mirrors
...

 

Enabling YUM Plug-ins

 

To enable yum plug-ins, ensure that the directive plugins=1 (1 meaning on) exists under the [main] section in the /etc/yum.conf file, as shown below.

# vi /etc/yum.conf

 

Yum Configuration File
------------------------------------------------------------------------
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1 installonly_limit=5 

 

This is a general method of enabling yum plug-ins globally. As we will see later on, you can enable them individually in their receptive configuration files.

 

Disabling YUM Plug-ins

 

To disable yum plug-ins, simply change the value above to 0 (meaning off), which disables all plug-ins globally.

plugins=0

 

At this stage, it is useful to note that:

  • Since a few plug-ins (such as product-id and subscription-manager) offer fundamental yum functionalities, it is not recommended to turn off all plug-ins especially globally.
  • Secondly, disabling plug-ins globally is allowed as an easy way out, and this implies that you can use this provision when investigating a likely problem with yum.
  • Configurations for various plug-ins are located in /etc/yum/pluginconf.d/.
  • Disabling plug-ins globally in /etc/yum.conf overrides settings in individual configuration files.
  • And you can also disable a single or all yum plug-ins when running yum, as described later on.

 

Installing and Configuring Extra YUM Plug-ins

 

You can view a list of all yum plug-ins and their descriptions using this command.

# yum search yum-plugin

Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Loading mirror speeds from cached hostfile
 * base: mirror.sov.uk.goscomb.net
 * epel: www.mirrorservice.org
 * extras: mirror.sov.uk.goscomb.net
 * updates: mirror.sov.uk.goscomb.net
========================================================================= N/S matched: yum-plugin ==========================================================================
PackageKit-yum-plugin.x86_64 : Tell PackageKit to check for updates when yum exits
fusioninventory-agent-yum-plugin.noarch : Ask FusionInventory agent to send an inventory when yum exits
kabi-yum-plugins.noarch : The CentOS Linux kernel ABI yum plugin
yum-plugin-aliases.noarch : Yum plugin to enable aliases filters
yum-plugin-auto-update-debug-info.noarch : Yum plugin to enable automatic updates to installed debuginfo packages
yum-plugin-changelog.noarch : Yum plugin for viewing package changelogs before/after updating
yum-plugin-fastestmirror.noarch : Yum plugin which chooses fastest repository from a mirrorlist
yum-plugin-filter-data.noarch : Yum plugin to list filter based on package data
yum-plugin-fs-snapshot.noarch : Yum plugin to automatically snapshot your filesystems during updates
yum-plugin-keys.noarch : Yum plugin to deal with signing keys
yum-plugin-list-data.noarch : Yum plugin to list aggregate package data
yum-plugin-local.noarch : Yum plugin to automatically manage a local repo. of downloaded packages
yum-plugin-merge-conf.noarch : Yum plugin to merge configuration changes when installing packages
yum-plugin-ovl.noarch : Yum plugin to work around overlayfs issues
yum-plugin-post-transaction-actions.noarch : Yum plugin to run arbitrary commands when certain pkgs are acted on
yum-plugin-priorities.noarch : plugin to give priorities to packages from different repos
yum-plugin-protectbase.noarch : Yum plugin to protect packages from certain repositories.
yum-plugin-ps.noarch : Yum plugin to look at processes, with respect to packages
yum-plugin-remove-with-leaves.noarch : Yum plugin to remove dependencies which are no longer used because of a removal
yum-plugin-rpm-warm-cache.noarch : Yum plugin to access the rpmdb files early to warm up access to the db
yum-plugin-show-leaves.noarch : Yum plugin which shows newly installed leaf packages
yum-plugin-tmprepo.noarch : Yum plugin to add temporary repositories
yum-plugin-tsflags.noarch : Yum plugin to add tsflags by a commandline option
yum-plugin-upgrade-helper.noarch : Yum plugin to help upgrades to the next distribution version
yum-plugin-verify.noarch : Yum plugin to add verify command, and options
yum-plugin-versionlock.noarch : Yum plugin to lock specified packages from being updated

 

To install a plug-in, use the same method for installing a package. For instance, we will install the changelog plug-in which is used to display package changelogs before/after updating.

# yum install yum-plugin-changelog 

 

Once you have installed, changelog will be enabled by default, to confirm take look into its configuration file.

# vi /etc/yum/pluginconf.d/changelog.conf

 

Now you can view the changelog for a package (httpd in this case) like this.

# yum changelog httpd

Loaded plugins: changelog, fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.ucartz.com
 * epel: mirror.freethought-internet.co.uk
 * extras: mirrors.ucartz.com
 * updates: mirrors.ucartz.com

Listing all changelogs

==================== Installed Packages ====================
httpd-2.4.6-45.el7.centos.4.x86_64       installed
* Wed Apr 12 17:30:00 2017 CentOS Sources <bugs@centos.org> - 2.4.6-45.el7.centos.4
- Remove index.html, add centos-noindex.tar.gz
- change vstring
- change symlink for poweredby.png
- update welcome.conf with proper aliases
...

 

Disable YUM Plug-ins in Command Line

 

As stated before, we can also turn off one or more plug-ins while running a yum command by using these two important options.

--noplugins – turns off all plug-ins

--disableplugin=plugin_name – disables a single plug-ins

 

You can disable all plug-ins as in this yum command.

# yum search --noplugins yum-plugin

 

The next command disables the plug-in, fastestmirror while installing httpd package.

# yum install --disableplugin=fastestmirror httpd

Loaded plugins: changelog
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.4.6-45.el7.centos.4 will be updated
--> Processing Dependency: httpd = 2.4.6-45.el7.centos.4 for package: 1:mod_ssl-2.4.6-45.el7.centos.4.x86_64
---> Package httpd.x86_64 0:2.4.6-67.el7.centos.6 will be an update
...

 

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