HEADS UP! -- Re: Kernel versions, xen, grub.conf, yum upgrades

[Tom Horsley]

Another thing to watch for: If you were previously running xen
kernel, and you install a non-xen kernel and remove xen, odds
are good that the file /etc/sysconfig/kernel will still have a
line in it that says something like:

DEFAULTKERNEL=kernel-xen

This will then cause the scripts which attempt to auto edit
the grub.conf file when updating kernels to get very confused
and your newly updated kernel will probably not wind up
as the default, so you'll think you updated, but you'll wind
up booting the old kernel after all :-).

Change the sysconfig line to just:

DEFAULTKERNEL=kernel

and updates will act more normal-like.