How to create a swap file

# Step1: Create a swap file

# If you want to add more swap, 
# replace 1G with the size of the swap space you need
sudo fallocate -l 1G /swapfile 
# If fallocate is not installed or you get an error message saying 
# fallocate failed: Operation not supported then use the following 
# command to create the swap file
sudo dd if=/dev/zero of=/swapfile bs=1024 count=1048576 # if line 5 executed then leave it
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo nano /etc/fstab
# Paste this in it
/swapfile swap swap defaults 0 0
sudo swapon --show
# Enjoy!
# Credit Linuxize

Source: linuxize.com

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