Re: [WBEL-users] Screwed by a CentOS4 install test

I'm not a grub expert but here is probably our best source of info on
the subject:
http://www.gnu.org/software/grub/manual/html_node/index.html

On 4/14/06, Jack Glendening <[email protected]> wrote:
> Terry,
>
> It appears that your message is coming fromt a private email rather from the
> mailing list so I will reply by email.
>
> > You are supposed to be repairing the boot loader, not the install -
> > you should stay on task.
>
> OK, I will try to repair the boot loader - but so far my attempts to do so
> have not been successful.
>
> > Try Shift-PageUp to go back and read those errors,  which should give
> > you valuable clues.
> > You can also look at the xfree log and see what went wrong.
>
> Using I can now see that the first obvious failure comes from
> the line
>    "Remounting root filesystem: read-write mode : mount: LABEL=1 duplicate -
> not mounted"
> That occurs after the "Welcome to WBEL" line.
>  But I notice that prior to that there are lines
>    "FS: file system mounted root (ext2 filesystem)
>    RedHat nash version 3.5.13 starting"
>
> I don't see how/why RedHat nash should be in there since I believe that is the
> CentOS4 version.
>
> > Just write your boot loader to MBR of hda and be done with it, (to me,
> > that is somewhat simplier), and it doesn't really matter which distro
> > you do it from - a boot lodader is a bootloader is a bootloader - grub
> > is grub (lilo is lilo, etc.)
>
> Well "just" doesn't seeom so simple for me since what I have tried so far has
> not worked.
>
> Someone on the CentOS4 forum said I should issue the following:
> commands to a grub prompt obtained at the (CentOS4) boot screen
>    root (hd0,0
>    setup (hd0)
>    chainloader +1
>    boot
>
> but when I tried that I got error messages at the "bootloader +1" line and at
> the "boot" line.  From reading the GRUB manual it seemed to me that I should
> instead use "setup (hd0,0)" so I re-ran the sequence with that alteration and
> this time I got the following messages (these are hand typed, not a cut+paste
> exact copy) - note that my hda1 partitiona has a label /boot
>   root (hd0,0)
>        Filesystem is ext2fs, partition type 0x83
>   setup (hd0,0)
>        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 (hd0,0)" failed - this is not fatal
>         Running "install /grub/stage1 (hd0,0) /grub/stage2 p /grub/grub.conf"
> succeeded
>         Done
>   chainloader +1
>         (no messages returned, error or otherwise)
>   boot
>       Read Error
>
> If you have an alternative grub command sequence I should use I will be glad
> to try it.  FWIW I do have backups of what was in the WBEL /boot prior to
> this mess.  Also FYI the hda1/grub/grub.conf uses the lines
>       root (hd0,0)
>       kernel /vmlinuz-2.4.21-40.ELsmp ro root=LABEL=/ hdc=ide-scsi
>      initrd /initrd-2.4.21-40.ELsmp.img
>
>                              Jack
>


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