After an update, there's always a possibility to see some more kernel entries on your GRUB on booting. A quick listing can be done:
# rpm -q kernel
(the lastest is at the bottom, which also can be produced typing # uname -r )
We next make use of the package-cleanup tool in yum-utils to limit the number of kernels desired. If yum-utils isn't installed, do
# yum install yum-utils
Next set the number of kernels to the desired count (say, 2)
# package-cleanup --old kernels --count=2
Make the amount of installed kernels permanent
# gedit /etc/yum.conf
and set installonly_limit = 2
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