On Thu, 13 Apr 2006 21:21:44 +0200
Philippe De Ryck <[EMAIL PROTECTED]> wrote:
> On Thu, 2006-04-13 at 12:13 -0600, Justin Guerin wrote:
> > Hi,
> >
> > I've had to move my install to a new physical disk. I made an image of my
> > two partitions (/boot and /), and they restored properly. Now, I only need
> > to run grub-install to install the boot loader.
> >
> > When I boot from Knoppix, I can mount the / to /mnt/target, then mount
> > /boot
> > to /mnt/target/boot, and /proc to /mnt/target/proc, but I can't get
> > grub-install to work properly. When I chroot /mnt/target, and run grub,
> > grub can't see the drives (error 21). However, when I back out of the
> > chroot, grub sees the drives just fine.
> >
> > Can anyone tell me how grub accesses the bios to find out information about
> > drives? I'm not passing something through the chroot, but I have no idea
> > what. The device nodes are available in the chroot, and so is proc. I'm
> > running as root, and I know I have access to the device nodes.
> >
> > Any help is appreciated.
> >
> > Justin
>
> Justin,
>
> I don't think it is necessary to chroot at all. The knoppix disk has
> grub on board, so you can use that command. The command also has a
> command line switch to specify a device (/dev/hda for instance) and you
> can also specify a root-dir. If you specify as root-dir the mount point
> of your system (/mnt/target) grub will take the config file
> from /mnt/target/boot/...) and everything should work just fine.
>
> If you search the internet (or the manual perhaps) for this specific
> info you'll find a lot more.
>
> Good luck
>
> Philippe De Ryck
This will work, but will install the grub version from Knoppix. If you
still want to do via chroot here's the recipe. Commands indented for
visibility (# means the root prompt, you can use sudo instead) and
assuming hda2 is your '/' and hda1 is your '/boot':
1. mount your / /boot AND /dev:
#mount /dev/hda2 /mnt/target
#mount /dev/hda1 /mnt/target/boot
#mount -o remount /dev /mnt/target/dev
2. chroot:
#chroot /mnt/target
3. mount /proc:
#mount /proc
4. install grub:
#grub-install /dev/hda
This should do it. The first part is the one that can create problems.
If you mount / via Knoppix's fstab then you won't be able to
mount /dev due to the nodev option ;) (This is documented on Knoppix's
site)
HTH
Andrei
--
If you can't explain it simply, you don't understand it well enough.
(Albert Einstein)
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