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Old 09-13-2009, 11:02 AM   #1
ssenuta
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Registered: Mar 2006
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Distribution: Mandriva-2006
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Creating a Grub2 boot-cd with a (grub.cfg) menu ..my solution


Here is how I created a Grub2 boot-cd with a (grub.cfg) menu:
mkdir /tmp/cdroot
mkdir /tmp/cdroot/boot
mkdir /tmp/cdroot/boot/grub

cp /boot/grub/grub.cfg /tmp/cdroot/boot/grub

cd /tmp

grub-mkrescue --modules="linux ext2 fshelp ls boot pc" --overlay=cdroot --image-type=cdrom grub2-boot.iso

Burn the grub2-boot.iso image with K3b or cdrecord

###################################################################
NOTE: The above proceedure assumes you already have a grub.cfg file.
If you don't, create one in the /tmp/cdroot/boot/grub directory
 
Old 10-01-2009, 01:17 AM   #2
kerrylinux
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Registered: May 2009
Location: Co. Kerry, Ireland
Distribution: CentOS, Fedora, RedHat, Ubuntu Enterprise Cloud
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Hello,

have a look at:

http://linuxcoaching.eu/linux_coachi...-cd-drive.html

This can be a natural solution for those, who need to boot (grub2) without a CD drive.

RON
 
Old 10-04-2009, 10:00 PM   #3
ssenuta
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Thank you for the Grub2 "loopback" reference. I tested the procedure outlined in the article & was able to successfully boot a rescue ramdrive from a (rescue.iso) image file. After my ramdrive is booted, I can remove the usp-stick & just work from ram.

#####################################################################
Here is what I did:

fdisk -l ..fdisk displays your drives
Plugin usb-stick
fdisk -l ..fdisk identifies your new (usb-stick) drive

fdisk /dev/sdc ..Create two primary linux type 83 partitions (sdc1=10M & sdc2=default)
on the usb stick & toggle (a) /dev/sdc1 to (*) bootable
mkfs.ext3 /dev/sdc1
mkfs.ext3 /dev/sdc2

mount -t ext3 /dev/sdc2 /mnt/misc
cp rescue.iso /mnt/misc
umount /mnt/misc

mount -t ext3 /dev/sdc1 /mnt/misc
grub-install --modules="linux boot pc ext2 fshelp ls loopback gzio" --root-directory=/mnt/misc /dev/sdc1

Edit /mnt/misc/boot/grub/device.map

(eg.) (fd0) /dev/fd0
(hd0) /dev/sdc ..usb-stick (/dev/sdc) will be 1st hard-drive to boot
(hd1) /dev/sdb
(hd2) /dev/sda
(hd3) /dev/hda

grub-install --modules="linux boot pc ext2 fshelp ls loopback gzio" --root-directory=/mnt/misc /dev/sdc1

Create /boot/grub/grub.cfg

(eg.) set default=0
set timeout=10
set menu_color_normal=white/cyan
set menu_color_highlight=yellow/blue

menuentry "Isolinux Rescue-2.6.30" {
loopback loop (hd0,2)/rescue.iso ..(hd0,2)=/dev/sdc2
set root=(loop)
linux /isolinux/bzImage root=/dev/ram0 vga=771 ..bzImage (kernel) is in isolinux directory of rescue.iso
initrd /isolinux/initrd.gz ..initrd.gz (rootfs) is in isolinux directory of rescue.iso
}

Umount /mnt/misc
#####################################################################

Note: Because this .iso image is for ramdrive rootfs, I added the kernel (bzImage) parameter "root-/dev/ram0"

Last edited by ssenuta; 10-04-2009 at 10:02 PM.
 
Old 02-04-2010, 06:16 PM   #4
aus9
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Registered: Oct 2003
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ssenuta

thankyou for your info.

It appears there have been changes. I use to burn grub2 cds with genisoimage and an extracted eltorito image from grub-mkrescue....and keyword searching brought me here

thanks

FWIW your old command no longer works
grub-mkrescue --modules="linux ext2 fshelp ls boot pc" --overlay=cdroot --image-type=cdrom grub2-boot.iso

instead try this
Code:
grub-mkrescue --modules="linux ext2 fshelp ls boot pc" --output=grub2-boot.iso cdroot

Last edited by aus9; 02-04-2010 at 06:22 PM. Reason: turn off the caps key
 
  


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