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Specify grub root with uuid?
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Philippe23
Tux's lil' helper
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Joined: 20 Dec 2006
Posts: 89
Location: Rome, NY

PostPosted: Sun Apr 21, 2013 9:47 pm    Post subject: Specify grub root with uuid? Reply with quote

Grub disagrees with my kernel over drive ordering. I'd like to move both to UUIDs or Labels. I know how to do so with the kernel parameter, but I do not know how to do so with the grub root command:

title=Gentoo Linux (3.8.3) Custom Kernel (new-drive)
root (hd1,3)
kernel /boot/kernel-3.8.3-hardened root=/dev/sdb4

Anyone know how?
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Maitreya
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Joined: 11 Jan 2006
Posts: 221

PostPosted: Mon Apr 22, 2013 11:59 am    Post subject: Reply with quote

IIRC grub 0.97 can do this with an initrd for normal partitions.

title=Gentoo Linux (3.8.3) Custom Kernel (new-drive)
kernel /boot/kernel-3.8.3-hardened realroot=SOME-RIDICULOUS-STRING-01234
initrd /boot/initramfs-3.8.3-hardened


And without for GPT partitions.

title=Gentoo Linux (3.8.3) Custom Kernel (new-drive)
kernel /boot/kernel-3.8.3-hardened root=PARTUUID=SOME-RIDICULOUS-STRING-01234
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Philippe23
Tux's lil' helper
Tux's lil' helper


Joined: 20 Dec 2006
Posts: 89
Location: Rome, NY

PostPosted: Mon Apr 22, 2013 12:47 pm    Post subject: Reply with quote

Yeah, that's the kernel options, an argument to the kernel that's resolved by the kernel. The part I don't know is how to change the bold+italic line in my post, the one that tells GRUB where to find kernel itself. "(hd1,3)" is the part I'd like to replace.
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s4e8
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Joined: 29 Jul 2006
Posts: 212

PostPosted: Mon Apr 22, 2013 12:54 pm    Post subject: Reply with quote

If /boot/grub and /boot/ live on same partition, you don't need the bold+italic line.
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baragoon
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Joined: 11 Feb 2013
Posts: 8

PostPosted: Thu Apr 25, 2013 9:51 am    Post subject: Reply with quote

use labels fo filesystems
Code:
# cat /media/GENTOO_USB_BOOT/grub/device.map
(hd0)   LABEL=GENTOO_USB_ROOT


Code:
# cat /media/GENTOO_USB_BOOT/grub/grub.conf

default 0
timeout 10
splashimage=(hd0,0)/boot/grub/splash.xpm.gz

title Gentoo Linux 3.7.10
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-3.7.10-gentoo root=/dev/ram0 real_root=LABEL=GENTOO_USB_ROOT rootfstype=ext4 elevator=noop
initrd /boot/initramfs-genkernel-x86_64-3.7.10-gentoo
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py-ro
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Joined: 24 Sep 2002
Posts: 1493
Location: St. Wendel

PostPosted: Thu Apr 25, 2013 11:57 am    Post subject: Reply with quote

Legacy Grub can't handle UUID for it self, you would need to upgrade to grub2.

Bye
Py
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