[CentOS] I need help with GRUB

Sadaruwan Samaraweera slinuxworld at gmail.com
Tue Sep 2 05:36:19 UTC 2008


On Tue, Sep 2, 2008 at 4:14 AM, Al Sparks <data345 at yahoo.com> wrote:

> --- On Mon, 9/1/08, Lanny Marcus <lmmailinglists at gmail.com> wrote:
>
> > From: Lanny Marcus <lmmailinglists at gmail.com>
> > Subject: Re: [CentOS] I need help with GRUB
> > To: "CentOS mailing list" <centos at centos.org>
> > Date: Monday, September 1, 2008, 9:53 AM
> > On Sun, Aug 31, 2008 at 11:31 PM, Sadaruwan Samaraweera
> > <slinuxworld at gmail.com> wrote:>
> > > On Mon, Sep 1, 2008 at 9:55 AM, Ian Forde
> > <ian at duckland.org> wrote:
> > >>
> > >> On Mon, 2008-09-01 at 09:47 +0530, Sadaruwan
> > Samaraweera wrote:
> > >> > Hello,
> > >>
> > >> >    And the problem that I'm having is
> > with my two Linux distros. Ive
> > >> > installed CentOS & Windows in my SATA HDD
> > and I've used my complete
> > >> > 40GB PATA HDD for Ubuntu. Well all OS's
> > work fine with out any
> > >> > problems but when I want to boot into CentOS
> > I've to select the SATA
> > >> > as my booting HDD from the BIOS if I want to
> > go to Ubuntu the I've to
> > >> > select my PATA as the default HDD from the
> > menu. So what I want to do
> > >> > is I need to add Both distros in to one GRUB
> > boot loader and the other
> > >> > thing is that both grubs that I've on
> > both HDD s only detects the
> > >> > windows Partition not the Linux partion. So I
> > need to to know how to
> > >> > add bothe Linux versions I've into one
> > GRUB. I want to use the SATA
> > >> > HDD as my default HDD.
> > >>
> > >> You'll want to merge the grub boot stanzas
> > into one file, apply it to
> > >> one (or both) of the drives, and keep it in sync
> > when you do kernel
> > >> updates (because those affect the grub menu)...
> > This way, you won't have
> > >> to change the BIOS setting.
> > >>
> >
> > > OK, thx for the quick reply but I realy don't know
> > how to do that can any
> > > one help on that note.
> >
> >
> > Possibly what you need to do is add another entry in your
> > /etc/grub.conf file, on the HD you boot from.  Below is
> > mine.
> >
> > [lanny at dell2400 ~]$ sudo cat /etc/grub.conf
> > Password:
> > # grub.conf generated by anaconda
> > #
> > # Note that you do not have to rerun grub after making
> > changes to this file
> > # NOTICE:  You have a /boot partition.  This means that
> > #          all kernel and initrd paths are relative to
> > /boot/, eg.
> > #          root (hd0,2)
> > #          kernel /vmlinuz-version ro
> > root=/dev/VolGroup00/LogVol00
> > #          initrd /initrd-version.img
> > #boot=/dev/hda
> > default=0
> > timeout=5
> > splashimage=(hd0,2)/grub/splash.xpm.gz
> > hiddenmenu
> > title CentOS (2.6.18-92.1.10.el5)
> >         root (hd0,2)
> >         kernel /vmlinuz-2.6.18-92.1.10.el5 ro
> > root=/dev/VolGroup00/LogVol00 rhgb quiet
> >         initrd /initrd-2.6.18-92.1.10.el5.img acpi=off
> > title CentOS (2.6.18-92.1.6.el5)
> >         root (hd0,2)
> >         kernel /vmlinuz-2.6.18-92.1.6.el5 ro
> > root=/dev/VolGroup00/LogVol00 rhgb quiet
> >         initrd /initrd-2.6.18-92.1.6.el5.img acpi=off
> > title CentOS (2.6.18-92.1.1.el5)
> >         root (hd0,2)
> >         kernel /vmlinuz-2.6.18-92.1.1.el5 ro
> > root=/dev/VolGroup00/LogVol00 rhgb quiet
> >         initrd /initrd-2.6.18-92.1.1.el5.img acpi=off
> > title Windows XP
> > rootnoverify (hd0,0)
> > chainloader +1
> > [lanny at dell2400 ~]$
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
>
>
> It's handy that someone posted their grub file.
>
> The answer to your question/situation might be complicated by the fact that
> you use you have been changing your boot up disk in your BIOS.
>
> But the thing to look for in your grub.conf file is:
>
> > title CentOS (2.6.18-92.1.1.el5)
> >         root (hd0,2)
> >         kernel /vmlinuz-2.6.18-92.1.1.el5 ro
>
> Note that this example includes an entry for a hard drive:
>
> >         root (hd0,2)
>
> That entry points to the "first" hard drive, third partition.  If you
> have 2 hard drives, and you wanted to boot off the "second" drive
> first partition, you might use:
>        root (hd1,0)
>
> You basically want to look at the grub configuration for each OS on
> each hard drive you installed it on, and in consolidating them, "cut
> and paste" entries from what you want to be your secondary drive to
> your primary boot drive.
>
> Again, this is only using the above grub.conf as an example.  If you
> have SCSI hard drives instead then probably the grub.conf will show
> something like:
>       root (sd0,2)
>
> So it's important to look at your grub.conf and make modifications.
>
> Hope this helps.  If you want more specific advice, then post BOTH
> grub.conf files, and tell us which one will be from what you want to
> be your secondary drive, and what you want to be your primary drive
> (in BIOS).
>     === Al
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>



-- 
Sadaruwan Samaraweera


Hi,

       Thank you very much for responding for my plea for help and after
some painful hours of search and going through some forums I got what I want
and it's working now here is my grub.conf on the SATA drive which I wanted
to be my primary booting drive.


# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,6)
#          kernel /vmlinuz-version ro root=/dev/VL1/LogVol00
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,6)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-92.1.10.el5)
    root (hd0,6)
    kernel /vmlinuz-2.6.18-92.1.10.el5 ro root=/dev/VL1/LogVol00 rhgb quiet
    initrd /initrd-2.6.18-92.1.10.el5.img
title CentOS (2.6.18-92.el5)
    root (hd0,6)
    kernel /vmlinuz-2.6.18-92.el5 ro root=/dev/VL1/LogVol00 rhgb quiet
    initr /initrd-2.6.18-92.el5.img
title Ubuntu
        rootnoverify (hd1,0)
        chainloader +1
title WindowsXP SP2
    rootnoverify (hd0,0)
    chainloader +1

If there's anything wrong with this please let me know.

Regards
Sadaruwan Samaraweera
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