FreeBSD init works different ways. In BSD style, it specifies the kernel security level as follows:
-1: Permanently insecure mode.
0: Insecure mode
1: Secure mode
2: Highly secure mode
3: Network secure mode
You can get current security level (FreeBSD runlevel) using sysctl command:
# sysctl –a | grep kern.securelevel
You can setup new security level in /etc/rc.conf file:
1) Open file in text editor
# vi /etc/rc.conf
2) Add or modify following:
kern_securelevel_enable=”YES” # kernel security level
kern_securelevel=”2″ # range: -1..3 as above
3) Save the changes. Exit and restart FreeBSD.
If init used from command line i.e as a user process, init will emulate AT&T System V UNIX behavior as follows:
0: Halt and turn the power off
1: Go to single-user mode
6: Reboot the machine
c: Block further logins
q: Rescan the /etc/ttys file
1) To halt and turn the power off type:
# init 0
2) You can also use normal halt or shutdown command to shutdown system.
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