[CentOS] RHEL/CentOS 7 Dual boot with CentOS 5.x/6.x - default boot quick solution/howto

Cliff Pratt enkiduonthenet at gmail.com
Sun Mar 23 02:18:26 UTC 2014


On Sun, Mar 23, 2014 at 1:39 PM, Nux! <nux at li.nux.ro> wrote:

> On 22.03.2014 17:46, Ljubomir Ljubojevic wrote:
> > I have RHEL 7 Beta installed in dual boot with CentOS 6.x. Since RHEL
> > 7
> > installed GRUB2, I had problem that RHEL 7 is default boot.
> >
> >
> > My personal solution was to go to /etc/grub.d and run command:
> > mv 10_linux 31_linux
> >
> > grub2-mkconfig -o /boot/grub2/grub.cfg
> >
> > Explanation:
> >
> >
> > - /etc/grub.d is where grub2 writes down config files used to create
> > boot menu.
> > - OS-prober creates 30_os-prober file in /etc/grub.d
> > - 10_linux is created for RHEL/CentOS 7.x system installed.
> >
> > If you change order of files in /etc/grub.d (numbers at the start of
> > the
> > files) the list generated with grub2-mkconfig will change order in the
> > GRUB2 menu :)
>
> Oh boy, I'm so going to miss Grub 0.97..
> Thanks for sharing, though!
>

That method of ordering configuration files has been around for decades, so
nothing new there. (eg /etc/init.d).

However I do find grub2's configuration a little confusing. Nothing new
there. It'll sink in sometime, no doubt.

Cheers,

Cliff



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