On Wednesday, February 17, 2016 10:03:04 AM Rick Stevens wrote:
On 02/16/2016 09:19 PM, Mike Wright wrote:
> On 02/16/2016 08:15 AM, Chris Murphy wrote:
>> At the GRUB menu, type
>>
>> pager=1
>> set
>>
>> Look for variable 'prefix=' this will be drive, partition, and path, to
>> the GRUB directory where its cfg and modules are found.
>
> All right Chris!
>
>
> So apparently grub.cfg is ?compiled? into some other secret location
> know only to the bootloader. I have the sinking feeling I have to run
> some grub2 magic spell to get the modified boot file into wherever it
> goes but am loathe to try anything. The reason I have a stripped down
> grub.cfg is because the last one generated for me was pushing 200K and
> the boot lines in each stanza had, so help me, nineteen swap files
> included in each one.
>
grub2 uses the file /boot/grub2/grub.cfg by default. This file does get rebuilt by kernel
updates,
and by running /sbin/grub2-mkconfig
> Now the question:
>
> Is there a command that will take my simplified grub.cfg and install it
> without modifying it in any way and leave me with a bootable system?
> (please please please say yes).
I've never used it, but I suspect grub-menulst2cfg may do what you
want. It claims to "Convert a configuration file from GRUB 0.xx to GRUB
2.xx format". If you're going to continue to tinker in this way, you
really have to read up on grub2:
http://www.gnu.org/software/grub/manual/grub.html
I agree it's convoluted and confusing and I'm not a fan (just like I'm
not a fan of systemd or journald), but that's what you're stuck with.
Most of the config info you may need to change is in /etc/default/grub.
The scripts that generate the menu entries are in /etc/grub.d
(particularly 10_linux and possibly 40_custom). The final config created
by grub2-mkconfig generally ends up in /boot/grub2/grub.cfg.
If you remove the file /etc/grub.d/30_osprober, then grub2-mkconfig will not look for
other
operating systems to add to the config file, but will only add the kernels for the current
OS. Then
if you have a simple chainloader as the initial config that points to each OS, each OS
will only
have its on entries in its grub.cfg.
--
Lester M Petrie
Bldg 5700, Room O305
Oak Ridge National Laboratory
Phone 865-574-5259, Email petrielmjr(a)ornl.gov