GRUB Queries ?! Post: 302884127

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Operating Systems Linux Debian GRUB Queries ?! Post 302884127 by sreyan32 on Friday 17th of January 2014 02:38:22 PM

01-17-2014

Registered User

Quote:

Originally Posted by Corona688

GRUB is often packaged by distributions to make it easier to install and upgrade.

GRUB's very reason to exist is because it uses configuration files instead of finicky bits hardcoded inside the MBR or some other hard-to-access disk location. That's quite a feat for a mere bootloader -- reading files generally needs the OSes help. That's what makes GRUB so big and complicated (for a bootloader, anyway). That's also what makes grub so flexible.

Other bootloaders like lilo cannot actually access files before anything boots. It must cache its configuration in the MBR or some other difficult-to-read place before before it will take effect.

GRUB usually uses Windows' bootloader to load Windows. It doesn't have to overwrite it due to the way Windows stores it. A simple 'chainloader' command tells grub to load the MBR from the Windows partition and it can handle itself from there.

Sir, you didn't tell me why various distributions are provided for various OSes. Like Debian has its own version of GRUB which is different from Fedora. If GRUB can boot all Linux why cant there be only one single universal GRUB for all Linux ?

Also why does GRUB need to read the configuration files of Linux ? It doesn't do so with Windows so why can't it do the same for Linux ?

Also what is the difference between the GRUB offered at-:
GNU GRUB - Obtaining GRUB
and the GRUB that comes with every Linux distribution ?

---------- Post updated at 01:08 AM ---------- Previous update was at 01:03 AM ----------

Quote:

Originally Posted by hicksd8

I'm not the Grub expert that you are looking for but maybe I'll say a few things that might help. My forte is Solaris, SCO and Linux (but not boot loaders).

However, I have had to deal with a number of boot failures under Linux and Linux Appliances (eg, RSA boxes) so I know that Grub errors and corruptions can be fixed ("re-installed" boot loader).

Here's a link:

301 Moved Permanently

Also there's a project on the internet called Super Grub Disk (with a later version called Super Grub2 Disk) which provides all kinds of tools for Grub. I never go into battle against Grub without their bootable CD in my toolkit.

Also, Super Grub Disk To The Rescue! - What's a GRUB? - Tutorials - LinuxPlanet

Hope that helps and I hope that you get other responses.

Sir, I know that SuperGRUB can repair GRUB but can it install GRUB on a system without a Linux bootloader ?

sreyan32

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LEARN ABOUT SUNOS

installgrub

installgrub(1M) 														   installgrub(1M)

NAME

       installgrub - install GRUB in a disk partition or a floppy

SYNOPSIS

       /sbin/installgrub [-fm] stage1 stage2 raw-device

       The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader.

       installgrub  installs  GRUB  stage  1  and  stage  2  files on the boot area of a disk partition. If you specify the -m option, installgrub
       installs the stage 1 file on the master boot sector of the disk.

       The installgrub command accepts the following options:

       -f

	   Suppresses interaction when overwriting the master boot sector.

       -m

	   Installs GRUB stage1 on the master boot sector interactively.

       The installgrub command accepts the following operands:

       stage1

	   The name of the GRUB stage 1 file.

       stage2

	   The name of the GRUB stage 2 file.

       raw-device

	   The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable.  For  disk
	   devices,  specify  the  slice  where  the  GRUB  menu  file	is  located.  (For Solaris it is the root slice.) For a floppy disk, it is
	   /dev/rdiskette.

       Example 1: Installing GRUB on a Hard Disk Slice

       The following command installs GRUB on a system where the root slice is c0d0s0:

       example# /sbin/installgrub /boot/grub/stage1 
		/boot/grub/stage2 /dev/rdsk/c0d0s0

       Example 2: Installing GRUB on a Floppy

       The following command installs GRUB on a formatted floppy:

       example# mount -F pcfs /dev/diskette /mnt
       # mkdir -p /mnt/boot/grub
       # cp /boot/grub/* /mnt/boot/grub
       # umount /mnt
       # cd /boot/grub
       # /sbin/installgrub stage1 stage2 /dev/rdiskette

       /boot/grub

	   Directory where GRUB files reside.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5)

       Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always
       boot the GRUB in the Solaris partition regardless of which fdisk partition is active.

								    24 May 2005 						   installgrub(1M)