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Re: A Grub Boot Question about initrd

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On Sat, Jun 05, 2021 at 12:46:13PM -0500, Martin McCormick wrote:
> I have a plan but I need some more information.  Is there any
> personalization done by the boot setup process?

Yes. One of the GRUB's tasks is to supply kernel which is about to boot
with root=... cmdline parameter. Root filesystem UUID can be used for
this.


> Do our UUID's or any other specific information pertaining to the
> installation make it in to the initrd files?

In Debian - no, unless you include it there for some bizarre reason.
It's not needed for the things initrd usually does.


> 	If that is so, then two computers using the same
> processor type should be able to use copies of the same initrd files
> and the only thing that is personalized on an individual computer
> is all the grub configuration in which the UUID's of at least /
> and /swap partitions are sprinkled throughout grub.cfg and
> /etc/default/grub.

It's not the CPU difference you need to worry about.
Different SATA controllers, video cards, NICs - i.e. what they call
periphery devices - those things require different kernel modules that
should be (or could be) used in early boot process, and therefore need
to be included in initrd.

Luckily, Debian uses initramfs-tools for building initrd, and
initramfs-tools should build initrd with everything and a kitchen sink
included (MODULES=most in /etc/initramfs-tools/initramfs.conf).


> 	One should be able to write a program to get the
> appropriate UUID's out of fstab on the working system
> and translate them in to corresponding UUID's for the system on
> the operating table.

Er, they've invented filesystem labels for exactly this many decades
ago.


> 	As an aside, one ought to be able to do something like
> this.  It makes life a lot simpler.  Both systems are using the
> same kernel and versions of the same processor the only real
> differences are the UUID's.

Perfectly possible for the last 15 years or so. Assuming Debian and
MODULES=most, of course.

Reco

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Thread

A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-05 19:50 +0200
  Re: A Grub Boot Question about initrd deloptes <deloptes@gmail.com> - 2021-06-05 20:10 +0200
  Re: A Grub Boot Question about initrd Reco <recoverym4n@enotuniq.net> - 2021-06-05 20:30 +0200
    Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-05 21:30 +0200
  Re: A Grub Boot Question about initrd Felix Miata <mrmazda@earthlink.net> - 2021-06-05 21:30 +0200
    Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-05 23:30 +0200
      Re: A Grub Boot Question about initrd Greg Wooledge <greg@wooledge.org> - 2021-06-06 01:20 +0200
      Re: A Grub Boot Question about initrd Felix Miata <mrmazda@earthlink.net> - 2021-06-06 01:50 +0200
      Re: A Grub Boot Question about initrd Cindy Sue Causey <butterflybytes@gmail.com> - 2021-06-06 02:20 +0200
        Re: A Grub Boot Question about initrd Gene Heskett <gheskett@shentel.net> - 2021-06-06 04:30 +0200
        Re: A Grub Boot Question about initrd "Andrew M.A. Cater" <amacater@einval.com> - 2021-06-06 14:30 +0200
  Re: A Grub Boot Question about initrd Andrei POPESCU <andreimpopescu@gmail.com> - 2021-06-06 13:20 +0200
    Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-06 20:40 +0200
      Re: A Grub Boot Question about initrd Felix Miata <mrmazda@earthlink.net> - 2021-06-06 22:40 +0200
        Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-07 00:00 +0200
          Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-07 03:10 +0200
          Re: A Grub Boot Question about initrd Felix Miata <mrmazda@earthlink.net> - 2021-06-07 04:40 +0200
            Re: A Grub Boot Question about initrd "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-07 14:20 +0200
            Grub Success at Last "Martin McCormick" <martin.m@suddenlink.net> - 2021-06-09 00:20 +0200
              Re: Grub Success at Last, but way offtopic Gene Heskett <gheskett@shentel.net> - 2021-06-09 01:00 +0200
    Re: A Grub Boot Question about initrd David Wright <deblis@lionunicorn.co.uk> - 2021-06-07 20:40 +0200

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