Configuration File Structure

The GRUB menu interface configuration file is /boot/grub/grub.conf. The
commands to set the global preferences for the menu interface are placed at the
top of the file, followed by stanzas for each operating kernel or operating system
listed in the menu.

The following is a very basic GRUB menu configuration file designed to boot
either Red Hat Enterprise Linux or Microsoft Windows 2000:

  • default=0
  • timeout=10
  • splashimage=(hd0,0)/grub/splash.xpm.gz
  • hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-2.el5PAE)
  • root (hd0,0)
  • kernel /boot/vmlinuz-2.6.18-2.el5PAE ro root=LABEL=/1 rhgb quietinitrd /boot/initrd-2.6.18-2.el5PAE.img
# section to load Windows

  • title Windows rootnoverify (hd0,0) chainloader +1
This file configures GRUB to build a menu with Red Hat Enterprise Linux
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.

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