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[ OpenBSD ]
"Setting OpenBSD Securelevel" - Huzeyfe Ínal - (2004-08-06 11:22:23) 
OpenBSD comes with 4 different SecureLevel,which are -1,0,1,2.Default securelevel is 1 ,-1 is being the least secure; 2 is the most secure.
You can change this value in /etc/rc.securelevel and reboot to activate new securelevel,if u don't want reboot u can try
sysctl -w kern.securelevel=2
kern.securelevel: 1 -> 2
note**:Securelevel may not be lowered while the system is running, it can only be raised.
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