CentOS - Mar 2015 - installing C7 on a laptop with Win7, dual boot

On Mon, Mar 02, 2015 at 03:33:59PM +0100, M?rio Barbosa
wrote:
> On 03/02/2015 02:06 AM, Fred Smith wrote:
> > Hi all!
> > 
> > I've just installed C7 on my netbook that already contained Win7
(and
> > also Fedora 19, which the C7 is intended to replace). The Fedora
installer
> > had found the windows installation and it appeared in the grub menu,
> > and was bootable and worked fine.
> > 
> > The C7 installer did not put the windows installation into the grub
> > menu.
> > 
> > with some googling I found a page at
https://priteshugrankar.wordpress.com/2014/09/12/dual-booting-centos-7-and-windows-7/
that gives a simple recipe for
> > fixing this problem. basically:
> > 
> > cp /boot/grub2/grub.cfg orig.grub.cfg
> > grub2-mkconfig -o /boot/grub2/grub.cfg
> > 
> > with (on his system) the second command above producing this output:
> > 
> > 	[root at localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
> > 	Generating grub configuration file ...
> > 	Found linux image: /boot/vmlinuz-3.16.2-1.el7.elrepo.x86_64
> > 	Found initrd image: /boot/initramfs-3.16.2-1.el7.elrepo.x86_64.img
> > 	Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
> > 	Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
> > 	Found linux image: /boot/vmlinuz-3.10.0-123.6.3.el7.x86_64
> > 	Found initrd image: /boot/initramfs-3.10.0-123.6.3.el7.x86_64.img
> > 	Found linux image:
/boot/vmlinuz-0-rescue-327fe33f3b364802871211321a2790b7
> > 	Found initrd image:
/boot/initramfs-0-rescue-327fe33f3b364802871211321a2790b7.img
> > 	Found Windows 7 (loader) on /dev/sda1
> > 	Found Windows 7 (loader) on /dev/sda2
> > 	done
> > 
> > Unfortunately, when I did it, I got this:
> > 
> > Generating grub configuration file ...
> > Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
> > Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
> > Found linux image: /boot/vmlinuz-3.10.0-123.20.1.el7.x86_64
> > Found initrd image: /boot/initramfs-3.10.0-123.20.1.el7.x86_64.img
> > Found linux image:
/boot/vmlinuz-0-rescue-c875112952114f6284f69abaa4f9a2f7
> > Found initrd image:
/boot/initramfs-0-rescue-c875112952114f6284f69abaa4f9a2f7.img
> > done
> > 
> > No mention of the windows installation.
> > 
> > It's not that I use the win7 installation much, but I do want to
be able
> > to do so when one of those rare occasions pops up.
> > 
> > Thanks in advance!
> > 
> > Fred
> 
> 
> 1) Install ntfs "support"
> yum install -y epel-release
> yum install -y ntfs-3g ntfsprogs
> 
> 2) re-run the grub config gen script
> grub2-mkconfig -o /boot/grub2/grub.cfg
> 
> Best,
> M?rio
Ah, Mario, that's exactly what I needed to know! thanks!

It seems rather like a chicken-and-the-egg problem, which came first?
you can't install ntfs-3g until you've installed the system, and it
won't notice the windows partition(s) there until you've installed
ntfs-3g. But it sets up the grub config at install time, so you get
a system apparently without windows support.

A newbie (which I'm not) would certainly find this confusing/disheartening.

Thanks again for the solution I needed!

Fred

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us
-----------------------------
   "For the word of God is living and active. Sharper than any double-edged
   sword, it penetrates even to dividing soul and spirit, joints and marrow; 
              it judges the thoughts and attitudes of the heart."  
---------------------------- Hebrews 4:12 (niv) ------------------------------

On Mon, Mar 2, 2015 at 7:55 AM, Fred Smith
<fredex at fcshome.stoneham.ma.us> wrote:
> On Mon, Mar 02, 2015 at 03:33:59PM +0100, M?rio Barbosa wrote:
>> 1) Install ntfs "support"
>> yum install -y epel-release
>> yum install -y ntfs-3g ntfsprogs
>>
>> 2) re-run the grub config gen script
>> grub2-mkconfig -o /boot/grub2/grub.cfg
>>
>> Best,
>> M?rio
>
> Ah, Mario, that's exactly what I needed to know! thanks!
>
> It seems rather like a chicken-and-the-egg problem, which came first?
> you can't install ntfs-3g until you've installed the system, and it
> won't notice the windows partition(s) there until you've installed
> ntfs-3g. But it sets up the grub config at install time, so you get
> a system apparently without windows support.
>
> A newbie (which I'm not) would certainly find this
confusing/disheartening.
Ahh yes, good tip.

I'm pretty sure dual-boot on CentOS is de-emphasized or maybe flat out
not supported, is probably why ntfs3-g isn't on the installer media.
On Fedora, that's a required based package because of explicit dual
boot support, and it's necessary because the installer uses ntfs-3g to
resize the Windows volume to make room for Fedora.


-- 
Chris Murphy

On Mon, Mar 02, 2015 at 06:05:37PM -0700, Chris Murphy
wrote:
> On Mon, Mar 2, 2015 at 7:55 AM, Fred Smith
> <fredex at fcshome.stoneham.ma.us> wrote:
> > On Mon, Mar 02, 2015 at 03:33:59PM +0100, M?rio Barbosa wrote:
> 
> >> 1) Install ntfs "support"
> >> yum install -y epel-release
> >> yum install -y ntfs-3g ntfsprogs
> >>
> >> 2) re-run the grub config gen script
> >> grub2-mkconfig -o /boot/grub2/grub.cfg
> >>
> >> Best,
> >> M?rio
> >
> > Ah, Mario, that's exactly what I needed to know! thanks!
> >
> > It seems rather like a chicken-and-the-egg problem, which came first?
> > you can't install ntfs-3g until you've installed the system,
and it
> > won't notice the windows partition(s) there until you've
installed
> > ntfs-3g. But it sets up the grub config at install time, so you get
> > a system apparently without windows support.
> >
> > A newbie (which I'm not) would certainly find this
confusing/disheartening.
> 
> Ahh yes, good tip.
> 
> I'm pretty sure dual-boot on CentOS is de-emphasized or maybe flat out
> not supported, is probably why ntfs3-g isn't on the installer media.
> On Fedora, that's a required based package because of explicit dual
> boot support, and it's necessary because the installer uses ntfs-3g to
> resize the Windows volume to make room for Fedora.
So that's why it worked with F19. I sure didn't know Anaconda could
resize the Windoze partition for you... I did it with gparted-live
when I installed F19. 

As my mom used to say: "You live and learn!:

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