Howto expand swap space by adding a swap file in Ubuntu

This post shows how to supplement your swap partition with a swap file.Quote from a thread in Ubuntuforums post by jdong.
First, create a 1000M swap file:

sudo dd if=/dev/zero of=/swap_file bs=1M count=1000

recommend size of swap is half of RAM,so replace 1000 with the size of the swap file desired, in MB. You can also put the swap_file in a different location if desired.

Next, we’ll secure the swapspace, so ordinary users cannot read the contents:

sudo chown root:root /swap_file
sudo chmod 600 /swap_file

Then,turn it into swap space, and turn it on:

sudo mkswap /swap_file
sudo swapon /swap_file

Finally,make it turn on at every bootup, open up /etc/fstab:

sudo gedit /etc/fstab

add this line to the end of the file:

/swap_file       none            swap    sw              0       0

Thanks,jdong from:http://ubuntuforums.org/showthread.php?t=89782

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