Re: Need Help Editing Grub

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Author: Eric Shubert
Date:  
To: plug-discuss
Subject: Re: Need Help Editing Grub
I often use knoppix to do this.

What's the difference though really? As long as he's got ubuntu running
on the HD, he can just do it there. I don't see much easier with a live
cd. Am I missing something?
--
-Eric 'shubes'

Dazed_75 wrote:
> Not addressing deleting windows, would it not be much easier to boot
> from a live CD with grub and di a grub install?
>
> On Sun, Jan 24, 2010 at 7:18 PM, Eric Shubert <
> <mailto:ejs@shubes.net>> wrote:
>
>
>     Mark,
>     I don't understand entirely the commands that kitepilot said to use
>     either.

>
>     Your menu.lst file looks correct.

>
>     savedefault, along with the "default" setting listed earlier in
>     menu.lst, controls which kernel is used as the default. savedefault
>     means "use me to boot next time", so generally speaking, the computer
>     boots whichever OS was running last. Providing the "default" setting
>     corresponds to this behavior.

>
>     makeactive and chainloader commands are used with windows partitions.
>     makeactive makes the partition active (whatever that means, but windows
>     seems to require it), and chainloader, which effectively passes control
>     over to the windows loader program, not unlike what happens when the
>     bios passes control to grub. At least that's what I would guess.

>
>     If grub is not installed in the mbr of the 2nd drive, it needs to be. I
>     think that might be what kp was trying to get to. In order to install
>     grub on mbr of drive hda, issue the "grub" command at the cli. Then at
>     the grub prompt, enter the part after the prompt:
>     grub> root (hd0,0)
>     grub> setup (hd0)
>     grub> quit

>
>     If your OS is the 2nd partition on the drive, then you'd specify:
>     grub> root (hd0,1)

>
>     If your drive is hdb, then you'd use hd1 in place of hd0.

>
>     That drive would then run grub when it's booted.

>
>     --
>     -Eric 'shubes'

>
>
>     Mark Phillips wrote:
>      > This is what I have in menu.lst
>      >
>      > title           Debian GNU/Linux, kernel 2.6.26-2-686
>      > root            (hd1,4)
>      > kernel          /boot/vmlinuz-2.6.26-2-686 root=/dev/hdb5 ro
>      > initrd          /boot/initrd.img-2.6.26-2-686

>      >
>      > title           Microsoft Windows XP Professional
>      > root            (hd0,0)
>      > savedefault
>      > makeactive
>      > chainloader     +1

>      >
>      > So, I change
>      > title           Debian GNU/Linux, kernel 2.6.26-2-686
>      > root            (hd1,4)
>      > kernel          /boot/vmlinuz-2.6.26-2-686 root=/dev/hdb5 ro
>      > initrd          /boot/initrd.img-2.6.26-2-686

>      >
>      > to

>      >
>      > title           Debian GNU/Linux, kernel 2.6.26-2-686
>      > root            (hd0,4) <-- change1 to 0 here
>      > kernel          /boot/vmlinuz-2.6.26-2-686 root=/dev/hda5 ro <---
>     change
>      > b to a here
>      > initrd          /boot/initrd.img-2.6.26-2-686

>      >
>      > and remove
>      > title           Microsoft Windows XP Professional
>      > root            (hd0,0)

>      >
>      > What about these bad boys.....
>      > savedefault
>      > makeactive
>      > chainloader     +1

>      >
>      > I still don't understand the grub commands that I was told to use.

>      >
>      > Mark

>      >
>      > On Sun, Jan 24, 2010 at 5:58 PM, Eric Shubert <
>     <mailto:ejs@shubes.net>
>      > <mailto:ejs@shubes.net <mailto:ejs@shubes.net>>> wrote:

>      >
>      >     "every reference to hd1,0 is converted to hd0,0"
>      >     You need to edit this manually. hd1 in grub corresponds to
>     hdb in linux,
>      >     and hd0 in grub is hda in linux.

>      >
>      >     Mark Phillips wrote:
>      >      > I understand the flow....shouldn't I tell grub somehow
>     that the
>      >     new boot
>      >      > drive is hd0,0? In your steps below, is there perhaps, a typo?

>      >      >
>      >      > Thanks!

>      >      >
>      >      > Mark

>      >      >
>      >      > On Sun, Jan 24, 2010 at 3:58 PM, 
>     <mailto:kitepilot@kitepilot.com>
>      >     <mailto:kitepilot@kitepilot.com <mailto:kitepilot@kitepilot.com>>
>      >      > <mailto:kitepilot@kitepilot.com
>     <mailto:kitepilot@kitepilot.com> <mailto:kitepilot@kitepilot.com
>     <mailto:kitepilot@kitepilot.com>>>
>      >     < <mailto:kitepilot@kitepilot.com>
>     <mailto:kitepilot@kitepilot.com <mailto:kitepilot@kitepilot.com>>
>      >      > <mailto:kitepilot@kitepilot.com
>     <mailto:kitepilot@kitepilot.com>
>      >     <mailto:kitepilot@kitepilot.com
>     <mailto:kitepilot@kitepilot.com>>>> wrote:

>      >      >
>      >      >      >> 1. How do I change grub on the Linux drive (hdb)
>     to say
>      >     "the ...
>      >      >     If you are running GRUB 0.XX (GRUB 1.XX is different):
>      >      >     Boot your Debian machine and as root run:
>      >      >     grub
>      >      >     root (hd1,0)
>      >      >     root (hd1)
>      >      >     It should answer that it found the stages, verify that
>     there
>      >     are no
>      >      >     errors.
>      >      >     quit

>      >      >

>      >      >
>      >      >     Then take a backup of /boot/grub/menu.lst and and make
>     sure that
>      >      >     everything
>      >      >     is either using UUID(s) or labels or every reference
>     to hd1,0 is
>      >      >     converted
>      >      >     to hd0,0

>      >      >
>      >      >     Verify your /etc/fstab likewise.

>      >      >

>      >      >
>      >      >      > 2. Do I move the second drive to the first ide port, or
>      >     leave it
>      >      >     as ...
>      >      >     Shutdown, pull the cable from the windoze drive and
>     plug it
>      >     to Linux
>      >      >     drive.
>      >      >     Turn on and pray...   :)
>      >      >     Free advice, you can't sue me   ;-)
>      >      >     YMMV
>      >      >     ET

>      >      >

>      >      >

>      >      >

>      >      >
>      >      >     Mark Phillips writes:

>      >      >
>      >      >      > I have two ide drives in one machine - drive 1 is a
>      >     Windows drive
>      >      >     and drive
>      >      >      > 2 is a Linux drive. Using grub, I can boot into either
>      >     windows or
>      >      >     debian. I
>      >      >      > want to remove the windows drive and replace it
>     with a larger,
>      >      >     blank drive
>      >      >      > for backup storage. I have a feeling if I just
>     remove the
>      >     first
>      >      >     drive and
>      >      >      > put the new one there, the machine will not boot, since
>      >     the MBR
>      >      >     is probably
>      >      >      > on the first drive (it came with the machine, and I
>     just added
>      >      >     the second
>      >      >      > drive for Linux). My questions:

>      >      >      >
>      >      >      > 1. How do I change grub on the Linux drive (hdb) to
>     say "the
>      >      >     windows drive
>      >      >      > is dead, boot here instead, long live linux"?

>      >      >      >
>      >      >      > 2. Do I move the second drive to the first ide port, or
>      >     leave it
>      >      >     as the
>      >      >      > second ide drive and put the new drive in the fist
>     ide port?

>      >      >      >
>      >      >      > Thanks!

>      >      >      >
>      >      >      > Mark
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>
>
>     --
>     -Eric 'shubes'

>
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>
>
>
> --
> Dazed_75 a.k.a. Larry
>
> The spirit of resistance to government is so valuable on certain
> occasions, that I wish it always to be kept alive.
> - Thomas Jefferson
>



--
-Eric 'shubes'

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