The Geek Stuff shows you how to password protect your grub boot loader installation in Linux

If you are a Linux sysadmin, you might not want others in your IT department, who has physical access to the server, change anything from the GRUB bootloader menu that is displayed during system startup.

GRUB is the 3rd stage in the Linux boot process that we discussed earlier.

GRUB security features allows you to set a password to the grub entries. Once you set a password, you cannot edit any grub entries, or pass arguments to the kernel from the grub command line without entering the password.

  How to Password Protect Grub Boot Loader in Linux