[ Thanks to An Anonymous Reader for
this link. ]
“Set BIOS Password
The BIOS is boot firmware, designed to be the first code run by a
PC when powered on. It controls many important system parameters,
including which devices the system will try to boot from, and in
which order. Assign a password to prevent any unauthorized changes
to the BIOS configuration. Reboot the server. Press special key
like F2 (this key may vary from system to system). Go to BIOS
configuration menu to add a password. Save and close the bios by
pressing F10 (again key may vary)“Set GRUB Boot Loader Password
By default popular Linux distro includes GRUB or Lilo as the
default boot loader for x86 systems. GRUB can be used to select
from different kernel images available on a particular operating
system’s partitions, as well as to pass boot-time parameters to
kernels. It also allows to to boot from different partitions or
media. GRUB can be used to by pass all security measurement
(including authentication) using single-user mode. You must
password protect GRUB from modifying the boot parameters and to
improve server security. See how to set GRUB boot loader password
using grub-md5-crypt command.”