How to password-protect single user mode in RHEL 7 with /etc/inittab

Solution Verified - Updated -

Issue

  • How to password-protect single user mode in RHEL7?
  • 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?
  • How to set the ":S:wait:/sbin/sulogin" in RHEL7?

Environment

  • Red Hat Enterprise Linux 7

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