Mailinglist Archive: opensuse (946 mails)

[Bruce Ferrell <bferrell@xxxxxxxxxxxx>]

On 10/21/2010 08:00 PM, David C. Rankin wrote:
> On 10/21/2010 07:59 PM, Bruce Ferrell wrote:
>   
> > OK, I got a kernel update and it trashed the boot loader leaving in a
> > grub prompt.
> >
> > SO, since the system repair option was removed because "about the only
> > thing it was used for was to fix the boot loader", how do I fix it?  I
> > really don't want to re-install.
> >
> > Bruce Ferrell
> >     
> +++++++++++++++
> Normal Install
> +++++++++++++++
>
> (1) Boot with the install cd and get to a command line (repair 
> console/whatever)
> (2) chroot your system "in say" /mnt
>
>   use 'cat /proc/partitions' to list your partitions, then start with your 
> root
> partition, home partition and then /boot (if separate and any others). 
> Example:
>
> (assuming / is on /dev/sda1, /boot on /dev/sda2 and /home on /dev/sda3)
>
> mount /dev/sda1 /mnt
> mount /dev/sda2 /mnt/boot
> mount /dev/sda3 /mnt/home
> mount -o bind /dev /mnt/dev
> mount -o bind /proc /mnt/proc
> mount -o bind /sys /mnt/sys
> cd /mnt
> chroot /mnt
>
> ** now you have your system chrooted under /mnt and can use any tools
> (Yast/etc.) to reinstall grub. Just do it by hand, it's easier:
>
> (3) type 'grub'  (no quotes)
>
>     If you are not sure which partition actually holds stage1 boot, use the
> command 'find' like this:
>
> (4)  grub> find /boot/grub/stage1  ( or just 'find stage1' )
>
>     This will search for the file name '/boot/grub/stage1' and show the 
> devices
> which contain the file.  Next set the root device correctly followed by the
> command 'setup' to complete the process. To set grub's root:
>
> (5)  grub> root (hd0,0)
>
> where hd0 represents the drive (hd0 - first drive, hd1 - second drive, etc..)
>
>     The next number is grub's root partition (not the same as your linux
> partition). This is the partition you BOOT from. So, if you have a separate
> /boot partition, this is the '0' based partition number for your /boot
> partition. If you have NO separate /boot partition, then this will just be 
> your
> / partition number.
>
>     If you have a RAID setup, then define the array that will serve as 'hd0',
> 'hd1' in your device.map file. Example:
>
> 00:21 archangel:~> cat /boot/grub/device.map
> (hd0) /dev/mapper/nvidia_fdaacfde
> (hd1) /dev/mapper/nvidia_baaccaja
> (fd0) /dev/fd0
>
>  Then, run the command 'setup'
>
> (6)  grub> setup (hd0)
>
> Your output should be:
>
> Checking if "/boot/grub/stage1" exists....... no
> Checking if "/grub/stage1" exists....... yes
> Checking if "/grub/stage2" exists....... yes
> Checking if "/grub/e2fs_stage1_5" exists....... yes
> Running "embed /grub/e2fs_stage1_5 (hd0)"....... 15 sectors are embedded
> succeded
> Running "install /grub/stage1 (hd0) (hd0) 1+15 p (hd0,2)/grub/stage2
> /grub/grub.conf....... succeded
> Done
>
>     The setup command has installed the GRUB boot loader on the Master Boot
> Record (MBR) of the first drive. (or drive specified with (hd#))
>
> (7) Type quit
>
>   grub> quit
>
> GRUB is now in the MBR.
>
> (8) go check your kernel line in the /boot/grub/menu.lst file and make sure 
> the
> initrd and vmlinuz files are linked to the proper files in /boot. If you need 
> to
> re-link them, just use 'ln -sf <target> <link>' Like:
>
> ln -sf vmlinuz-2.6.25.20-0.7-default vmlinuz
> ln -sf initrd-2.6.25.20-0.7-default initrd
>
> (9) exit the chroot setup by typing 'exit'
>
> reboot :p
>
>   
Mr Rankin,

I don't care what they say, you are a scholar and a gentleman!  And I'll
keep your secret!

Thank you

Bruce
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