[CentOS] I need help with GRUB

Al Sparks data345 at yahoo.com
Wed Sep 3 00:59:24 UTC 2008


--- On Mon, 9/1/08, Sadaruwan Samaraweera <slinuxworld at gmail.com> wrote:

> From: Sadaruwan Samaraweera <slinuxworld at gmail.com>
> Subject: Re: [CentOS] I need help with GRUB
> To: "CentOS mailing list" <centos at centos.org>
> Date: Monday, September 1, 2008, 9:36 PM
> 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
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

If it works, great.  I see that you do reference "hd1" on one of your
boot choices.
    === Al


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