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CentOS / RHEL 5 : How to password-protect single user mode

Locking down single-user mode in RHEL5 requires editing /boot/grub/grub.conf and /etc/inittab files.

1. Define the single user login shell in /etc/inittab by adding a the below line :

# vi /etc/inittab
...
su:S:wait:/sbin/sulogin

Or you can also use output redirection to have the entry placed in the file /etc/inittab :

# echo "su:S:wait:/sbin/sulogin" >>/etc/inittab

2. Doing the above results in single-user mode showing the same login prompt normally seen in emergency (maintenance) mode :
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