GRUB UUID Question

TKH · 08-11-2012, 09:58 AM

I just have a quick question:
Do I need an initrd.img to use UUID for grub loading?
If so, what do I need to include inside the initrd?
Thank you

towheedm · 08-11-2012, 12:50 PM

For GRUB2, this is set by default in /etc/default/grub.

Code:

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

If the GRUB_DISABLE_LINUX_UUID is uncommented, then comment it and run:

Code:

update-grub    # For debian and Debian-based distro, or
grub-mkconfig -o /boot/grub/grub.cfg    # or
grub2-mkconfig -o /boot/grub2/grub.cfg    # for Fedora, openSUSE and some others

Hope this helps.

syg00 · 08-11-2012, 08:46 PM

If "MBR", and grub (classic) yes you need an initrd. For grub2 see above.
For "gpt" the kernel (now) supports mounting the root via partUUID regardless of the bootloader. This is not the UUID of the filesystem.

So, as usual, it depends ...