Making a Swap File

sudo mkdir -v /var/cache/swap

cd /var/cache/swap

sudo dd if=/dev/zero of=swapfile bs=1K count=4M

This creates a swapfile of (1k x 4M) 4 Gigs. Change 4M to XM for an XGig swap.

sudo chmod 600 swapfile

sudo mkswap swapfile

sudo swapon swapfile

Test it's working with top

top -bn1 | grep -i swap

or:

echo "/var/cache/swap/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab

Test it'll work at boot with:

sudo swapoff swapfile

sudo swapon -va

Partition Swaps

Put this in /etc/fstab:

UUID=blah-blah none swap sw 0 0

Then test it works with:

sudo swapon -va

Test other partitions in fstab with:

sudo mount -a