To start CFS automatically at boot time, add these lines to /etc/rc.local:

if [ -x ${PREFIX}/sbin/cfsd ]; then
	if pgrep mountd > /dev/null; then
		echo -n ' cfsd';	${PREFIX}/sbin/cfsd >/dev/null 2>&1
		mount -o port=3049,nfsv2,intr,sync localhost:/null /crypt
	else
		echo -n ' cfsd (failed, no mountd running)'
	fi
fi

Then do these steps as root:

   0) add this line to /etc/exports

/null localhost

   1) set "nfs_server=YES" and "portmap=YES" in /etc/rc.conf.local
   2) reboot or start all necessary daemons by hand and mount /crypt