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Old 12-03-2008, 08:52 AM   #1
diwakars
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Registered: May 2008
Location: India
Distribution: RHEL 5
Posts: 9

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/boot/grub/grub.conf file has been deleted on rhel5


Hello gurus'

I've deleted /boot/grub/grub.conf file from my RHEL5 system for testing purpose.
I'm unable to do "chroot /mnt/sysimage" so how can I change to /boot directory. I was not able to mount my cdrom.


I have additional queries on this
1. What is exactly happening when this file is deleted??
2. How to recover my system in this scenario??
3. Does 512 bytes of the boot loader gets deleted??
4. Is there any other method to recover my system??

I would be thank full and helpful if anyone can solve this issue.

Thanks and regards
Diwakar
 
Old 12-03-2008, 09:40 AM   #2
mrrangerman
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Registered: Oct 2007
Location: MI
Distribution: Debian Slackware
Posts: 528

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Here this should get you going.
 
Old 12-03-2008, 10:51 AM   #3
hasanatizaz
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Registered: Nov 2007
Location: Pakistan
Distribution: Redhat and Debian
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grub.conf is just nothing it is just a file in which entries are made so that next time when you boot your machine you don't have to boot your os manually, instead a file is being read and loadeded in which certain instructions are written that how to pass the control over the kernel and which os should start first.
your mbr is safe till this point,

is it 512 or 446 ?
 
Old 12-03-2008, 10:55 AM   #4
hasanatizaz
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when you insert your rescue cd just do chroot /mnt/sysimage
then cd /boot
you have to make grub.conf yourself

here is my grub.conf

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/sda2
# initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-8.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-8.el5 ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.18-8.el5.img
 
Old 12-03-2008, 11:12 AM   #5
diwakars
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Registered: May 2008
Location: India
Distribution: RHEL 5
Posts: 9

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I mentioned that I cannot do "chroot /mnt/sysimage".
There is no directory called sysimage in /mnt. I tried doing it.
 
Old 12-03-2008, 12:21 PM   #6
chipotphe
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Registered: Nov 2007
Posts: 62

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Quote:
Originally Posted by diwakars View Post
1. What is exactly happening when this file is deleted??
Nothing. Most of the time grub.conf is just a symlink to menu.lst.
Normaly you get "grub>" prompt.

Quote:
Originally Posted by diwakars View Post
2. How to recover my system in this scenario??
Reinstalling grub.
Or creating a configfile.

Quote:
Originally Posted by diwakars View Post
3. Does 512 bytes of the boot loader gets deleted??
No

Quote:
Originally Posted by diwakars View Post
4. Is there any other method to recover my system??
See your question 2
 
  


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