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NOTE: CentOS Enterprise Linux 5 is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux 5 is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux 5.

Chapter 20. Additional Boot Options

This appendix discusses additional boot and kernel boot options available for the Red Hat Enterprise Linux installation program.

To use any of the boot options presented here, type the command you wish to invoke at the installation boot: prompt.

boot time command arguments


this command asks you to select the installation method you would like to use when booting from the Red Hat Enterprise Linux CD-ROM.


this argument causes the installation program to prompt you to use a driver image from a specified HTTP, FTP, or NFS network address.


this command allows remote display forwarding. In this command, ip should be replaced with the IP address of the system on which you want the display to appear.

On the system you want the display to appear on, you must execute the command xhost +remotehostname, where remotehostname is the name of the host from which you are running the original display. Using the command xhost +remotehostname limits access to the remote display terminal and does not allow access from anyone or any system not specifically authorized for remote access.


this command gives you the option of testing the integrity of the install source (if an ISO-based method). this command works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Verifying that the ISO images are intact before you attempt an installation helps to avoid problems that are often encountered during an installation.


this command disables hardware detection and instead prompts the user for hardware information.


this command runs rescue mode. Refer to Chapter 26, Basic System Recovery for more information about rescue mode.


this command disables the graphical installation program and forces the installation program to run in text mode.


this command allows you to install from a VNC server.


this command sets the password used to connect to the VNC server.


this command disables the default selection of ipv6 options during the installer stage 1 processing. Ipv6 settings may still be made manually if this option is specified, but the default behavior will be that Ipv6 settings are not enabled.


The 3270 console (most often used during installation on IBM System z) does not recognize terminal formatting entries common to most unix-style terminals. Specifying this option changes the behavior of anaconda during kickstart installations so that console output on the 3270 is much better. This option should not be used for regular, interactive installations.


This option is used to specify (usually in conjunction with the cmdline option) kickstart installation for IBM System z.

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