Keeping kernels

[david walcroft]

I'm trying to keep 4 kernels in  /boot/grub/grub.conf
 I have this in /etc/yum.conf

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
metadata_expire=1800
exclude=
installonly_kernel=4

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d

But it is not working,is there somewhere else that controls this
or have I got 'installonly_kernel=4' wrong.


   david