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Re-establish GRUB bootloader

Posted on 2004-04-23
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Last Modified: 2010-04-20
Somehow GRUB was giving me a Hard Disk Error when I tried to boot up.
I've used the rescue option of the install disk get into the system.
It appears all the files are there under a /mnt/sysimage.  Is there a
command I can use to get things back as they were on the hard disk so
I can just boot up?
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Question by:xoxomos
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by:jlevie
ID: 10904882
From a rescue boot you'd need to execute:

chroot /mnt/sysimage
grub-install /dev/hda

replacing hda by whatever the disk device is (hda, hdb, sda, etc). You can see that from a 'df' in resuce mode.
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Author Comment

by:xoxomos
ID: 10905235
Could you make that a bit more idiot-proof?
When I do df
/dev/root         5900       3506       2094     63%     /
/tmp/cdrom        660480     660480     0        100%    /mnt/source
/tmp/hda6         381139     34146      127315   65%     /mnt/sysimage
/tmp/hda1         46636      8998       35230    20%     /mnt/sysimage/boot
/tmp/hda5         17686464   10264360   6541672  61%     /mnt/sysimage/usr
/tmp/hda2         39697740   27130184   10551000 72%     /mnt/sysimage/usr
/tmp/hda7         256667     35490      207925   15%     /mnt/sysimage/var
/tmp/hda2         39697740   27130184   10551000 72%     /mount-hard-drive

The /mount-hard-drive is a directory I just made and mounted /dev/hda2 on it.
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by:jlevie
ID: 10905387
Your boot disk is /dev/hda
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Author Comment

by:xoxomos
ID: 10905929
It looks like grub-install calls grub, but can't find it even though it's in the very same directory.
Error message just comes back 'grub not found'
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jlevie earned 300 total points
ID: 10906182
Did you execute 'chroot /mnt/sysimage' before executing grub-install? The grub-install command is simply a shell script that invokes /sbin/grub. Unless your system has been damaged in some manner such that the grub binary can't run or that the shared libs it uses needs aren't available grub-install should work. You can find out if that's the case by:

chroot /mnt/sysimage
/sbin/grub

That will start grub in interactive mode. If that fails it should emit an error message indicating what the problem is.
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Author Comment

by:xoxomos
ID: 10906414
ok.  noi did not.  it'll have to wait till tomorrow
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by:jlevie
ID: 10907658
It is necessary to execute the chroot first so that grub-install will execute from your system image and not from the rescue envirormnet. Not doing so could be a good reason why it didn't work.
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Author Comment

by:xoxomos
ID: 10909518
Mil gracias!!!!
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