12-02-2017
Security here is to be understood from outer world, servers are in computer rooms, I doubt you unless you are a senior sysadm will have access, as mentionned above there is no more security if someone can physically get hold of your equipment, to be able to use grub means being in front of the PC... All you can do in such case is not allow to boot from any other device on your PC, and now you can guess what possible issue you risk...
That is why the hardening is difficult with cheap equipment
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LEARN ABOUT LINUX
grub-setup
GRUB-SETUP(8) System Administration Utilities GRUB-SETUP(8)
NAME
grub-setup - set up a device to boot using GRUB
SYNOPSIS
grub-setup [OPTION...] DEVICE
DESCRIPTION
Set up images to boot from DEVICE.
You should not normally run this program directly. Use grub-install instead.
-a, --allow-floppy
Make the drive also bootable as floppy (default for fdX devices). May break on some BIOSes.
-b, --boot-image=FILE
Use FILE as the boot image [default=boot.img]
-c, --core-image=FILE
Use FILE as the core image [default=core.img]
-d, --directory=DIR
Use GRUB files in the directory DIR [default=/boot/grub]
-f, --force
Install even if problems are detected
-m, --device-map=FILE
Use FILE as the device map [default=/boot/grub/device.map]
-r, --root-device=DEV
Use DEV as the root device [default=guessed]
-s, --skip-fs-probe
Do not probe for filesystems in DEVICE
-v, --verbose
Print verbose messages.
-?, --help
give this help list
--usage
give a short usage message
-V, --version
print program version
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
DEVICE must be an OS device (e.g. /dev/sda).
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
grub-install(8), grub-mkimage(1), grub-mkrescue(1)
The full documentation for grub-setup is maintained as a Texinfo manual. If the info and grub-setup programs are properly installed at
your site, the command
info grub-setup
should give you access to the complete manual.
grub-setup (GRUB) 1.99-12ubuntu5 October 2011 GRUB-SETUP(8)