FreeBSD: swap on file

Create the swap file:

dd if=/dev/zero of=/swap0 bs=1m count=300
chmod 0600 /swap0
echo  "md99	none	swap	sw,file=/usr/swap0,late	0	0" >> /etc/fstab

The md(4) device md99 is used, leaving lower device numbers available for interactive use.
Swap space will be added on system startup.
To add swap space immediately, use swapon(8):

swapon -aL

Remember to remove from /etc/fstab any unused swap entry.

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