On Wed, 30 Jul 2008, David Mathog wrote:
David Lombard wrote:
On Wed, Jul 30, 2008 at 09:13:56AM -0700, David Mathog wrote:
It then occurred to me that doing so would
require a trip through the BIOS on every reboot, at least on every x86
based computer I'm familiar with.
Not since kexec was added to the kernel!
That's exactly what I was thinking of for the Beowulf node problem.
For instance:
http://www.knoppix.net/forum/viewtopic.php?t=27192
Beyond using kexec as described above, grub directly supports this; lilo
did too.
I know how to do this by changing the configurations, but not how to
specify a one time change that doesn't need to be manually undone later.
Is either of these boot loaders capable of doing the logical equivalent of:
grub-next-boot-only -default 3
(Override whatever default is in the config file, but just for the next
boot.)
There are several ways to accomplish this, and they can be automated.
For example, run a script at boot time that runs a script like
/etc/specialboot if it exists. Then put:
#!/bin/sh
# cp /boot/grub/grub.conf.default /boot/grub/grub.conf
# cp /boot/grub/grub.conf.special /boot/grub/grub.conf
in it. Copy grub.conf into the two files. Edit special to boot your
special configuration, let the other one save out as the default/restore
point. copy the special to grub.conf. Boot. Uncomment the script line
that puts back the default and boot.
Plus infinite permutations of the general idea. We used to have
something very similar set up for hot installs. There may be better
ways to do it now, but this is easy to understand and implement and will
work.
rgb
Thanks,
David Mathog
[EMAIL PROTECTED]
Manager, Sequence Analysis Facility, Biology Division, Caltech
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Duke University Physics Dept, Box 90305
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