Re: "Recovery disk" question

From: Joe (joe_at_jretrading.com)
Date: 02/05/05

  • Next message: Adam Funk: "Re: Getting "shutdown" to shut the power off." 
    Date: Sat, 5 Feb 2005 12:46:11 +0000
To: debian-user@lists.debian.org

    In message <3uo1G-3wb-11@gated-at.bofh.it>, Jack Nguy
    <jack.nguy@gmail.com> writes
    >On Thu, 03 Feb 2005 19:50:50 -0800, Rich Rudnick <nickrud@verizon.net> wrote:
    >> On Thu, 2005-02-03 at 20:09 -0500, Curt Howland wrote:
    >> > -----BEGIN PGP SIGNED MESSAGE-----
    >> >
    >> > Ok, I intend to use Knoppix as a recovery disk. I know it has tools
    >> > like fsck and such, but I have a procedural question:
    >> >
    >> > How do I run "lilo" (if I need to, Cromm forbid) so that the MBR and
    >> > boot files on the hard drive are effected, not the CD?
    >> >
    >> > I've never tried to boot from one disk and run "lilo" on the other, I
    >> > don't know how to change the perspective of "lilo" to know to look
    >> > at /dev/hda1 instead of whatever disk it booted from.
    >> >
    >>
    >> My Seven Steps to Lilo Heaven
    >>
    >> (Assuming sarge or later for nano)
    >>
    >> 1. Boot up knoppix (or any recovery disk) and open a shell.
    >>
    >> 2. Create a mount point ( `mkdir /repair` )
    >>
    >> 3. Mount your root partition ( `mount -text3 /dev/hdd2 /repair` for me )
    >>
    >> * If /boot and/or /etc are separate partitions, mount them also
    >> ( /repair/[ boot|etc ] )
    >>
    >> 4. Switch to the hard disk installation ( `chroot /repair` )
    >>
    >> 5. Check for the correct boot files ( `ls /boot` )
    >>
    >> 6. Check the lilo configuration ( `nano /etc/lilo.conf` )
    >>
    >> 7. Write the MBR ( `lilo` )
    >

    >after you rescue root=/dev/hda[xx], I think you can usually run lilo
    >and have it write to the harddrives MBR. Seems easier that the other
    >stuff.
    >
    But that has to be done from the working system. The OP asked how to do
    it from another Linux running on the machine. Lilo can do the chroot
    itself (one less man lookup, unless you use chroot often).

     From 'man lilo':

          -r root-directory
                   Before doing anything else, do a chroot to the
                   indicated directory. Used for repairing a setup
                   from a boot floppy.

    Carry out steps 1, 2 and 3 and issue the command (using the example
    given):

    lilo -r /dev/hdd2/repair

    If there is any question of the integrity of the existing boot files or
    lilo.conf, Rich's method is slightly easier, but usually you know
    they're OK and just need to repair the MBR. 

    -- 
Joe
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