Yum-versionlock is a Yum plugin that takes a set of name/versions for packages and excludes all other versions of those packages. This allows you to protect packages from being updated by newer versions.The plugin provides a command "versionlock" which allows you to view and edit the list of locked packages easily.
To install yum-plugin-versionlock package# yum -y install yum-versionlock
To lock a package at current version: # yum versionlock packagename
or # yum versionlock add packagename
To list all current versionlock entries # yum versionlock list
To remove/delete versionlock entry for a package# yum versionlock delete packagename
To remove all versionlock entries: # yum versionlock clear