Our Device Names
- USB Pen Device Name : /dev/sdb1
- DVD Mount : /media/cdrom0
- USB Mount Point : /media/usb
- USB File System : Win FAT32
- ISO or DVD Image : Fedora / CentOS / RHEL
# dmesg | less
# dmesg | egrep -i 'cd|dvd'
# fdisk -l
Use the first command to identify the USB device name.
Mount CD/DVD ISO or DVD ITSELF
Type the following command to mount Fedora 12 iso image:# mount Fedora-12-x86_64-netinst.iso -o loop /media/cdrom0/
# DVD=/media/cdrom0
# ls -l $DVD
Sample outputs:
total 6 dr-xr-xr-x 3 root root 2048 2009-11-09 05:37 EFI drwxr-sr-x 3 root 499 2048 2009-11-09 05:37 images drwxr-sr-x 2 root 499 2048 2009-11-09 05:36 isolinuxYou need to use files stored in isolinux directory to create a bootable usb pen.
Format Usb
Create the fdisk partition:# fdisk /dev/sdb
You need to create only 1 partition. Next format the partition:
# USB=/media/usb
# mkdosfs /dev/sdb1
Finally mount the partition:
# mkdir -p /media/usb
# mount /dev/sdb1 /media/usb
# USB=/media/usb
Copy Required Files
Type the following commands:# cp -av $DVD/isolinux/* $USB
# cd $USB
# rm isolinux.bin boot.cat TRANS.TBL
# mv isolinux.cfg syslinux.cfg
Also copy the installer's initial RAM disk $DVD/images/pxeboot/initrd.img (for CentOS / RHEL Linux use $DVD/RedHat/images/pxeboot/initrd.img file) CD/DVD onto the usb drive:
# cp -v $DVD/images/pxeboot/initrd.img $USB
Unmount the USB drive
# umount /dev/sdb1
Make the USB Bootable
Type the following command to make the USB drive bootable# syslinux /dev/sdb1
# mount /dev/sdb1 $USB
syslinux is a boot loader for the Linux operating system which operates off an MS-DOS/Windows FAT filesystem.
Install Grub
Type the following command to install GRUB on the USB device:# grub-install --root-directory=$USB /dev/sdb
Create grub.conf:
# cd $USB
# mkdir -p boot/grub
Edit the grub.conf file
default=0 timeout=5 root (hd1,0) title Fedora Linux kernel /vmlinuz initrd /initrd.imgFinally, unmount the USB pen drive, enter:
# umount /dev/sdb1
Your USB pen is ready and should be bootable from the USB device. This can be used to install Fedora or CentOS or RHEL. You can also copy other required tools (such as sniffers or data recovery tools) on this pen. This is left as exercise for the reader.
Unetbootin Installer of Linux/BSD Distributions (GUI Tools)
If command line options are too complicated to follow. Try UNetbootin, which allows you to create bootable Live USB drives for a variety of Linux distributions from Windows or Linux, without requiring you to burn a CD. To install to a partition or USB drive type the following command:$ sudo apt-get install unetbootin
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