Installation guide

the menu interface times out.

• fallback=<integer> — Replace <integer> with the entry title number to try if the first attempt

fails.

• hiddenmenu — Prevents the GRUB menu interface from being displayed, loading the default

entry when the timeout period expires. The user can see the standard GRUB menu by

pressing the Esc key.

• initrd </path/to/initrd> — Enables users to specify an initial RAM disk to use when boot-

ing. Replace </path/to/initrd> with the absolute path to the initial RAM disk.

• kernel </path/to/kernel><option-1><option-N> — Specifies the kernel file to load when

booting the operating system. Replace </path/to/kernel> with an absolute path from the

partition specified by the root directive. Multiple options can be passed to the kernel when it

is loaded.

• password=<password> — Prevents a user who does not know the password from editing the

entries for this menu option.

Optionally, it is possible to specify an alternate menu configuration file after the

password=<password> directive. In this case, GRUB restarts the second stage boot loader and

uses the specified alternate configuration file to build the menu. If an alternate menu config-

uration file is left out of the command, a user who knows the password is allowed to edit the

current configuration file.

For more information about securing GRUB, refer to the chapter titled Workstation Security

in the Red Hat Enterprise Linux Deployment Guide.

• root (<device-type><device-number>,<partition>) — Configures the root partition for

GRUB, such as (hd0,0), and mounts the partition.

• rootnoverify (<device-type><device-number>,<partition>) — Configures the root partition

for GRUB, just like the root command, but does not mount the partition.

• timeout=<integer> — Specifies the interval, in seconds, that GRUB waits before loading the

entry designated in the default command.

• splashimage=<path-to-image> — Specifies the location of the splash screen image to be

used when GRUB boots.

• title group-title — Specifies a title to be used with a particular group of commands used

to load a kernel or operating system.

To add human-readable comments to the menu configuration file, begin the line with the hash

mark character (#).

8. Changing Runlevels at Boot Time

Under Red Hat Enterprise Linux, it is possible to change the default runlevel at boot time.

To change the runlevel of a single boot session, use the following instructions:

8. Changing Runlevels at Boot Time