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Old 12-06-2012, 11:06 AM   #1
jjj0923
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Registered: Jun 2011
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need to some identifying where to re-install grub loader on my system.


I have to re-install the grub loader on one of my systems

My Centos installation has 3 partitions
100 meg for /boot
6000 for swap
and the rest is created for /

my device names are:
/dev/dciss/c0d0p1 (boot)
/dev/dciss/c0d0p2 (swap)
and /dev/dciss/c0d0p3 ( / ) respectively.

I am not sure which partition (the boot p1′ or the / p3′ should contain the grub loader. My /boot partition is marked as boot with an asterisk?

I am following the instructions provided here:
http://roshan18.wordpress.com/2008/0...b-boot-loader/

however I'm a little concerned because I though I'd be installing the grub loader in (hd0,2) and I dumped the grub.conf file from another system I have that has the exact same disk & partition layout and this is what I see:

[root@myserver-backup grub]# cat device.map
# this device map was generated by anaconda
(hd0) /dev/cciss/c0d0

[root@myserver-backup grub]# cat 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/cciss/c0d0p3
# initrd /initrd-version.img
#boot=/dev/cciss/c0d0
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-308.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-308.el5 ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.18-308.el5.img
 
Old 12-06-2012, 11:18 AM   #2
amani
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Registered: Jul 2006
Location: Kolkata, India
Distribution: 64-bit GNU/Linux, Kubuntu64, Fedora QA, Slackware,
Posts: 2,758

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If the kernel numbers are ok, then it is ok.
Also why can't you automatically install grub?

#grub-install /dev/sda
 
Old 12-06-2012, 12:14 PM   #3
jjj0923
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Registered: Jun 2011
Posts: 14

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Quote:
Originally Posted by amani View Post
If the kernel numbers are ok, then it is ok.
Also why can't you automatically install grub?

#grub-install /dev/sda

it comes back with an error:

"not found or not a block device" and I run it from /sbin where grub-install is located
 
Old 12-06-2012, 12:15 PM   #4
jjj0923
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Registered: Jun 2011
Posts: 14

Original Poster
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Quote:
Originally Posted by amani View Post
If the kernel numbers are ok, then it is ok.
Also why can't you automatically install grub?

#grub-install /dev/sda
what exactly does "If the kernel numbers are ok, then it is ok." this mean?

I don't understand your reply.

given my device names - where should I install the grub loader?
 
Old 12-06-2012, 03:24 PM   #5
robertjinx
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Registered: Oct 2007
Location: Prague, CZ
Distribution: RedHat / CentOS / Ubuntu / SUSE / Debian
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Just run:

Code:
# grub
grub> root (hd0,0)
grub> setup (hd0)
grub> quit
# reboot
 
Old 12-09-2012, 09:57 AM   #6
amani
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Registered: Jul 2006
Location: Kolkata, India
Distribution: 64-bit GNU/Linux, Kubuntu64, Fedora QA, Slackware,
Posts: 2,758

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Quote:
Originally Posted by jjj0923 View Post
what exactly does "If the kernel numbers are ok, then it is ok." this mean?

I don't understand your reply.


given my device names - where should I install the grub loader?
You said that those were cut pasted.

Since centOS has grub legacy and not grub2,

grub-install /dev/mapper/<FIND THIS NAME>

should be sufficient or follow above post
 
  


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