Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007 Installation Manual page 415

As the user root, proceed as follows to set a boot password:
1 At the root prompt, encrypt the password using grub-md5-crypt:
# grub-md5-crypt
Password: ****
Retype password: ****
Encrypted: $1$lS2dv/$JOYcdxIn7CJk9xShzzJVw/
2 Paste the encrypted string into the global section of the file menu.lst:
gfxmenu (hd0,4)/message
color white/blue black/light-gray
default 0
timeout 8
password --md5 $1$lS2dv/$JOYcdxIn7CJk9xShzzJVw/
Now GRUB commands can only be executed at the boot prompt after pressing
P and entering the password. However, users can still boot all operating systems
from the boot menu.
3 To prevent one or several operating systems from being booted from the boot
menu, add the entry lock to every section in menu.lst that should not be
bootable without entering a password. For example:
title linux
kernel (hd0,4)/vmlinuz root=/dev/hda7 vga=791
initrd (hd0,4)/initrd
lock
After rebooting the system and selecting the Linux entry from the boot menu,
the following error message is displayed:
Error 32: Must be authenticated
Press Enter to enter the menu. Then press P to get a password prompt. After en-
tering the password and pressing Enter , the selected operating system (Linux in
this case) should boot.
The Boot Loader 397