On Thu, 11 Sep 2008 00:52:30 +0300
Andrei Popescu <andreimpopescu@gmail.com> wrote:
> On Wed,10.Sep.08, 14:24:07, Jack Schneider wrote:
>
> > Thanks, Andrei for the response. Checked out #s and yes they have
> > changed.
> > So I need some further guidance... "In case of any doubt use labels."
> > Any pointers to an appropriate "howto"???? Question 2 What's the
> > impact on FSTAB settings?
>
> Here's a (very quick) howto:
>
> * use e2label to create labels for all your partition:
>
> e2label /dev/hdaX root_part
>
> (where 'root_part' is the label for the root partition and /dev/hdaX is
> the device name of the root partition. Use whatever naming scheme you
> want).
>
> * edit /boot/grub/menu.lst and change the line
>
> # kopt=root=/dev/hda5 ro (other boot options)
>
> to
>
> # kopt=root=LABEL=root_part ro (other boot options)
>
> * also edit the stanza that you will boot and replace 'root=/dev/hda5'
> with 'root=LABEL=root_part'
>
> * edit /etc/fstab and change all references to the device (/dev/hda5,
> ...) with LABEL={label}
>
> * reboot
>
> * run /usr/sbin/update-grub to regenerate /boot/grub/menu.lst to use the
> label everywhere.
>
> Regards,
> Andrei
Hope the attached file helps. Commentary is appreciated, even expected ;-)
Title: "Changing mounts in fstab and GRUB boot to LABEL from dev." Author: Abel McClendon hcmmac@clearwire.net Copyright: "Caveat emptor (Law), let the purchaser beware, i. e., let him examine the article he is buying, and act on his own judgment. [1913 Webster]" Substitute "reader" for "purchaser" above. - Author. Substitute "reading" or "using" for "buying" above. - Author. ## Copyright (C) 2008 Abel McClendon This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ## Table of Contents: 1. Preface 2. Physical disk(s) must be labeled. 3. File /etc/fstab must be changed. 4. File /boot/grub/menu.lst must be changed. 5. Backup existing files, place new files, run update-grub, reboot at your leisure. 6. References and credits. Preface : Regularly hard disk device names may change ( e.g. from sdc to sdh to sdb etc). When this happens it possible a system will not boot. This document applies to Debian GNU/Linux with ext2/ext3 file systems. This document does one thing: It describes the procedure used to change mounting in /etc/fstab from /dev/hda1 to LABEL=lenny and make changes to GRUB survive reboot. It does not go into discussion of the merits of LABEL vs. UUID, security, usefulness, or anything else. 2. Physical disk(s) must be labeled. Careful selection of a label naming convention is required because future changes in devices in the system and or moving devices between systems may cause problems. Some devices (partitions) may already be labeled. e2label will tell. Here, pasted directly from the terminal, are the results of using e2label. First command is to see if a label exists. Second command is to do the labeling. Third command is to check whether the labeling took place. as root, partitions mounted : --code # e2label /dev/hda1 # e2label /dev/hda1 lenny # e2label /dev/hda1 lenny # --end code Lather,rinse,repeat as physical partitions and or devices on your system may differ. Of course change the new-label,lenny in this case, with name(s) of your choice. references: man e2label http://www.math.ias.edu/doc/e2fsprogs-1.35/RELEASE-NOTES "The ext2 library has been enhanced to make tune2fs safe to run on mounted file systems. (Users could usually get away with using tune2fs on mounted file systems before, but with the advent of ext3 and journaling, it became important to make tune2fs was *really* safe for use even when the file system being modified is mounted.) E2label is now implemented by tune2fs using an argv[0] dispatch, so that e2label is also now safe for use on mounted file systems." 3. File /etc/fstab must be changed. This procedure insures a good backup to restore and a sane, safe place for editing. as root: --code #cp /etc/fstab ~/misc/dev-to-label/fstab.dev #cp ~/misc/dev-vs-label/fstab.dev ~/misc/dev-to-label/fstab.label #pico ~/misc/dev-to-label/fstab.label #diff fstab.dev fstab.label 5c5 < /dev/hda1 / ext3 errors=remount-ro 0 1 --- > LABEL=lenny / ext3 errors=remount-ro 0 1 --end code Lather,rinse,repeat as physical partitions and or devices on your system may differ. Of course changing the new_label, lenny in this case, with name(s) of your choice. references: man cp man fstab man pico man diff 4. File /boot/grub/menu.lst must be changed. Edited /boot/grub/menu.lst producing this using a similar procedure as above to copy the files into the working directory. Just change the kopt line, update-grub will do the rest for you. as root: --code # diff menu.lst.dev menu.lst.label 62c62 < # kopt=root=/dev/hda1 ro --- > # kopt=root=LABEL=lenny ro vga=792 # --end code references: man grub man update-grub man bootparam the 'default' menu.lst file. 5. Backup existing files, place new files, run update-grub, reboot at your leisure. as root: --code #mv /etc/fstab /etc/fstab.dev.good #cp ~/misc/dev-to-label/fstab.label /etc/fstab #mv /boot/grub/menu.lst /boot/grub/menu.lst.dev.good #cp ~/misc/dev-to-label/menu.lst.label /boot/grub/menu.lst #update-grub # --end code Reboot at your leisure. references: man mv man update-grub 6. References and credits. man - the program man http://lists.debian.org/debian-user/2008/08/msg00808.html http://www.math.ias.edu/doc/e2fsprogs-1.35/RELEASE-NOTES http://shiny.thorne.id.au/2008/02/i-have-been-doing-lot-of-hacking-with.html http://csciwww.etsu.edu/nielsen/4417/grub-partitions-labels.txt http://www.debian-administration.org/articles/522 http://wiki.debian.org/DebianInstaller/Discussion irc channel #debian on OFTC.
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