How to password-protect the GRUB2 boot menu in RHEL 7 & 8

Solution Verified - Updated -

Issue

  • How to password-protect boot menu in RHEL 7 or RHEL 8?
  • How to enforce a password for the single user mode?
  • How to prevent user from getting into single-user mode or runlevel 1 without a password?
  • Goal: a Red Hat Enterprise Linux 7 or 8 system that requires manual entry of a bootloader password in order to modify kernel parameters. System can boot kernel without the entry of password if no kernel parameters modification

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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