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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@xxxxxxxx
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