Red Hat ENTERPRISE LINUX 5 - VIRTUAL SERVER ADMINISTRATION, Installation Manual

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Configuration File Directives
101
chain1
This file configures GRUB to build a menu with Red Hat Enterprise Linux as the default operating
system and sets it to autoboot after 10 seconds. Two sections are given, one for each operating
system entry, with commands specific to the system disk partition table.
Note
Note that the default is specified as an integer. This refers to the first
title
line in the
GRUB configuration file. For the
Windows
section to be set as the default in the previous
example, change the
default=0
to
default=1
.
Configuring a GRUB menu configuration file to boot multiple operating systems is beyond the scope of
this chapter. Consult
Section 9.9, “Additional Resources”
for a list of additional resources.
9.7.2. Configuration File Directives
The following are directives commonly used in the GRUB menu configuration file:
•
chainloader </path/to/file>
— Loads the specified file as a chain loader. Replace
</
path/to/file>
with the absolute path to the chain loader. If the file is located on the first sector of
the specified partition, use the blocklist notation,
+1
.
•
color <normal-color> <selected-color>
— Allows specific colors to be used in the menu,
where two colors are configured as the foreground and background. Use simple color names such
as
red/black
. For example:
color red/black green/blue
•
default= <integer>
— Replace
<integer>
with the default entry title number to be loaded if 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
booting. 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