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watch -n 5 free -m

# We can see if the system has any configured swap by typing:

# sudo swapon --show

You can verify that there is no active swap using the free utility:

# free -h

Before we do this, we should check the current disk usage by typing:


df -h

sudo fallocate -l 1G /swapfile


sudo chmod 600 /swapfile
ls -lh /swapfile

sudo mkswap /swapfile

sudo swapon /swapfile

sudo swapon --show

free -h

# Back up the /etc/fstab file in case anything goes wrong:

# sudo cp /etc/fstab /etc/fstab.bak
# You can add the swap file information to the end of your /etc/fstab file by typing:

# read about swappiness

# https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-16-04

# echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab