On Tue, Jul 2, 2024 at 11:49 AM Frank Bures <buresf@xxxxxxxxx> wrote:
Hi,
I was wondering if it was possible to boot the existing F40 installation
from a USB. I tried to research this but everything I was able to find
dealt with booting a live image of F40 from USB and/or installing a live
image of F40 on a USB.
I have a couple SSD's in external USB3 cases with Fedora 40 installed.
I just do a normal Fedora Workstation install from the Fedora 40 Live Installer
on USB stick. One is used 7x24 on an old iMac with a very slow 2. in laptop
type internal drive. The other is used for testing and rescues. I boot them
using:
% doas cat /etc/grub.d/40_custom
#!/usr/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Boot from USB Drive" {
set root=UUID=<UUID>
linux /vmlinuz root=/<UUID> ro
initrd /initrd.img
}
#!/usr/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Boot from USB Drive" {
set root=UUID=<UUID>
linux /vmlinuz root=/<UUID> ro
initrd /initrd.img
}
What I want is to create a USB stick with /boot and /boot/efi fs in such a
way that it boots an existing F40 installation on a HD.
This is way outside the design parameters for most USB sticks. Most will
have very poor performance running a full Fedora installation, and will not
last used this way.
I am not talking about rescuing the system from a live Fedora USB. I am
talking about a fully automatic boot of an existing installed Fedora from a
USB.
Is it possible and what would it involve?
* disable secure boot in the "UEFI" ("BIOS") configuration
* good quality external USB3 SSD
* add an external USB boot entry in grub2 on the host system
I have done this on systems with an existing Fedora installation and put the
grub2 USB stanza on the internal drive. On a system without any linux
installation I have only used BIOS boot, without UEFI.
--
George N. White III
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