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NOTE: CentOS Enterprise Linux is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux.

2.4. Can You Install Using the CD-ROM?

There are several methods that can be used to install Red Hat Enterprise Linux.

Installing from a CD-ROM requires that you have purchased a Red Hat Enterprise Linux 4 product, or you have a Red Hat Enterprise Linux CD-ROM, and you have a CD-ROM drive. Most new computers allow booting from the CD-ROM. If your system supports booting from the CD-ROM, it is an easy way to begin a local CD-ROM installation.

Your BIOS may need to be changed to allow booting from your CD-ROM drive. For more information about changing your BIOS, refer to Section 4.3.1 Booting the Installation Program on x86, AMD64, and Intel® EM64T Systems.

2.4.1. Alternative Boot Methods


If you can boot using the CD-ROM drive, you can create your own CD-ROM to boot the installation program. This may be useful, for example, if you are performing an installation over a network or from a hard drive. Refer to Section 2.4.2 Making an Installation Boot CD-ROM for further instructions.

USB pen drive

If you cannot boot from the CD-ROM drive, but you can boot using a USB device, such as a USB pen drive, the following alternative boot method is available:

To boot using a USB pen drive, use the dd command to copy the diskboot.img image file from the /images/ directory on CD-ROM 1. For example:

dd if=diskboot.img of=/dev/sda   

Your BIOS must support booting from a USB device in order for this boot method to work.

2.4.2. Making an Installation Boot CD-ROM

isolinux (not available for Itanium systems) is used for booting the Red Hat Enterprise Linux installation CD. To create your own CD-ROM to boot the installation program, use the following instructions:

Copy the isolinux/ directory from the Red Hat Enterprise Linux CD #1 into a temporary directory (referred to here as <path-to-workspace>) using the following command:

cp -r <path-to-cd>/isolinux/ <path-to-workspace>

Change directories to the <path-to-workspace> directory you have created:

cd <path-to-workspace>

Make sure the files you have copied have appropriate permissions:

chmod u+w isolinux/*

Finally, issue the following command to create the ISO image file:

mkisofs -o file.iso -b isolinux.bin -c -no-emul-boot \ 
-boot-load-size 4 -boot-info-table -R -J -v -T isolinux/


The above command was split into two lines for printing purposes only. When you execute this command, be sure to type it as a single command, all on the same line.

Burn the resulting ISO image (named file.iso and located in <path-to-workspace>) to a CD-ROM as you normally would.

  Published under the terms of the GNU General Public License Design by Interspire