Difference between revisions of "User:Faelar"

From ArchWiki
Jump to: navigation, search
(Blanked the page)
(8 intermediate revisions by 2 users not shown)
Line 1: Line 1:
[[Category:Boot process (English)]]
[[Category:System recovery (English)]]
[[Category:HOWTOs (English)]]
{{i18n_entry|English|Reinstalling GRUB}}
{{i18n_entry|Español|Reinstalando GRUB}}
{{i18n_entry|Česky|Přeinstalování GRUBu (Česky)}}
{{i18n_entry|Italiano|Reinstalling GRUB (Italiano)}}
{{i18n_entry|Ελληνικά|Reinstalling GRUB (Ελληνικά)}}
This guide will show you how to reinstall GRUB with an Arch Installation CD if you lose GRUB somehow.
*In this guide, I'll be using <tt>sda</tt> as my root udev type references. If you are using a pre-0.7.1 installation CD, you will have to substitute udev references for devfs references. See [[Technical Terms#Hard Drives|Hard Drives]] if this doesn't make sense.
*Also, be aware that this guide is aimed at people using SATA drives, not IDE so subsitute IDE names like <tt>hda</tt> iinstead of <tt>sda</tt> if you  have IDE devices and you are not using libata.
== Booting the Install CD ==
The first thing you will need is an [http://www.archlinux.org/download Install CD]. Any install CD should work; however, using the latest CD will be easier than using an older CD.
Boot the CD as if you were doing an installation ('''DO NOT''' use the <tt>root= option</tt>) and move on to the next step.
=== Mount and Chroot into Your Current Installation ===
Now, you need to mount your current installation. The general process for this is as follows:
*NOTE: You need to know what the proper partitions and filesystem types are. I will use <tt>sda1</tt> as the root partition and <tt>ext3</tt> as the filesystem in this example; change those for your personal setup.
cd /
# If you are using a pre-0.7.1 CD, sda1 will be /dev/discs/disc0/part1
mount -t ext3  /dev/sda1 /mnt
mount -t proc  proc      /mnt/proc
mount -t sysfs  sys      /mnt/sys
mount -o bind  /dev      /mnt/dev
chroot /mnt /bin/bash
Now you should be logged in as root, and into your current installation as if you had just booted it and logged in as root.
If your /boot directory is on the same partition as your /, move on to the next step. If on the other hand it's on a separate partition (for example, /dev/sda2), then you need to mount that partition now to /boot so that grub can find the files it needs:
mount -t ext2  /dev/sda2  /boot
===Reinstalling GRUB===
Edit <tt>/boot/grub/menu.lst</tt> and make sure that everything is in order. Once you are completely sure that <tt>menu.lst</tt> is correct, run the following command:
grub-install /dev/sda
This command should complete sucessfully if you have followed all the steps. (If not, take a look at the notes below.) That's it, you're done! Exit chroot and reboot:
cd /
umount -a
cd /
umount -a
If you get an error that says <tt>The file /boot/grub/stage1 not read correctly</tt>, it probably means that your fstab/mtab is incorrect for some reason and needs to be fixed. These files are <tt>/etc/mtab</tt> and <tt>/etc/fstab</tt>. Edit them and make sure they point to the correct partitions, then rerun grub-install.
If this still doesn't fix the error message and you're using ext2/3 as filesystem for your boot partition, use "tune2fs -l /dev/sda1" to check for the Inode size of your root/boot partition. Anything else than 128 will make grub unable to read the partition. The only solution for this problem is to recreate your rootfs with the correct options (fix /etc/mke2fs.conf and set inode_size to 128).
If you get an error that says <tt>sed: can't read /boot/grub/device.map: No such file or directory</tt>, it means that you need to use the --recheck option with grub-install.
  grub-install --recheck /dev/sda
Hopefully that covers all the issues you should encounter. If you get any other errors, reboot and do the guide step-by-step again.

Latest revision as of 23:14, 10 August 2009