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 boot.cat -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.