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6.4. Yum kernel handling plugin

A yum plugin written by Red Hat developers is provided by default within the yum package which only retains the latest two kernels in addition to the one being installed when you perform updates on your system. This feature can be fine tuned to retain more or less kernels or disabled entirely through the /etc/yum/pluginconf.d/installonlyn.conf file. There are other plugins and utilities available as part of yum-utils package in Fedora Extras software repository. You can install them using the following command.
yum install yum-utils