[Techtalk] Grub defaults after new kernel image install
Carla Schroder
carla at bratgrrl.com
Tue Jul 25 15:14:23 UTC 2006
On Tuesday 25 July 2006 07:48, Gina Lanik wrote:
> Hiya,
>
> I'm updating a few of our RHEL servers at work, which in some case also
> means a newer kernel image. Now I seem to recall that if in grub.conf the
> "default" line was set to anything other than 0, this would be honored on a
> new kernel image install so the server would boot from the "old" already
> existing and former default kernel. Is my memory faulty or was this
> behavior changed some time ago?
>
> TIA & cheers,
>
> Gina
The kernel stanzas are numbered in order starting from 0, so you can make any
of them the default. For example, if you have three different kernel stanzas
you can make the third one the default with 'default 2'. I don't recall what
happens when RHEL updates, you might have to configure this manually to get
the one you want.
A slick trick is to use the 'savedefault' option, which probably isn't what
you want, but I feel like telling about it anyway. :) If you are
multi-booting or have multiple kernels, GRUB will boot whatever you booted to
last, instead of always having the same default. It looks like this:
default saved
title Ubuntu, kernel 2.6.15-26-k7
root (hd0,4)
kernel /vmlinuz-2.6.15-26-k7 root=/dev/mapper/Ubuntu-root ro quiet splash
initrd /initrd.img-2.6.15-26-k7
savedefault
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Carla Schroder
check out my "Linux Cookbook", the ultimate Linux user's
and sysadmin's guide! http://www.oreilly.com/catalog/linuxckbk/
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