1. Swap disk
2. Swap file

Swap disk

sudo mkswap /dev/sde
sudo swapon /dev/sde

make permanent in /etc/fstab wuth e.g.:

UUID=0f87d670-a6e9-4d8e-97f6-8720caa520d4 none swap sw 0 0

Swap file

SWAPDIR=/home/swap
sudo mkdir $SWAPDIR
sudo fallocate -l 10G $SWAPDIR/swapfile.swap

Previous line has bug On centos 7 (2018-12-13). Use this instead:

sudo dd if=/dev/zero of=$SWAPDIR/swapfile.swap count=40000 bs=1MiB

Then:

sudo mkswap $SWAPDIR/swapfile.swap
sudo chmod 0600 $SWAPDIR/swapfile.swap 
sudo swapon $SWAPDIR/swapfile.swap

make permanent in /etc/fstab:

sudo nano /etc/fstab
$SWAPDIR/swapfile.swap swap swap defaults 0 0