Hi, you may find it easier to do the work using the SYSLINUX/EXTLINUX boot loader.

In my experience, it takes less time to learn how to use syslinux from zero,
compared to doing anything at all non-standard in grub/grub2.

And with grub2 even having custom order of boot entries is now non-standard.

This is addition to all the cases where grub/grub2 just
plain does not work (gives you a blank screen, or tells you
that existing files do not exist, or goes to the wrong disk,
or in one case corrupted the CMOS settings, and etc of course).

I am a happy SYSLINUX user and I would recommend it to everybody -
for network booting, for booting from disk, for booting from USB,
for booting from anything. My latest success was EFI boot
from a pcie ssd, where grub2 at best gave me a "grub>" prompt
and nothing more.


K.O.


On Mon, Apr 03, 2017 at 02:26:36PM -0700, Keith Lofstrom wrote:
> I'm looking for examples (with explanatory comments) of
> customized configuration files to use in the /etc/grub.d
> directory, somewhere out there on the intertubes.
> 
> Specifically, what I hope to add is a "11_single" file
> to /etc/grub.d that adds a boot menu option for booting
> the most recent kernel in single user mode. 
> 
> Yes, I know I can select a menu entry with "e", and
> then edit "SINGLE" onto the end of the kernel line.
> However, I will typically only do this when something
> is wrong, I am in a hurry to fix it, and prone to
> mistakes.  I prefer to prepare for emergencies in
> advance, when I am calm and have time to think things
> through, so I will have more brain cells to focus on
> on the specifics of an unplanned emergency.
> 
> I do best by copying and understanding examples.  The
> example "41_custom" file has almost no useful comments;
> they are there to remind the RHEL maintainer, not teach
> a newbie to make safe tweaks.  Ditto the documentation.
> 
> Completely implemented and explained, the new grub2
> setup could be a lot safer and easier to use than the
> old grub setup.  But old grub was simple vi tweaks of
> a single grub.conf file, and the new setup requires
> far more knowledge to operate properly.  I prefer to
> learn from multiple tested examples.  I'd rather spend
> an hour than a week learning to do this.
> 
> Any suggestions?  I did find an almost-germane
> explanation of a particular grub2 customization at
> https://help.ubuntu.com/community/Grub2/CustomMenus
> but my brain is too small to translate that into the
> solution that I am hoping for.
> 
> Keith
> 
> -- 
> Keith Lofstrom          [log in to unmask]

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada