How to Add Swap Space on Ubuntu 20.04

How do I check if my Ubuntu 20.04 system has swap space enabled?

It is very easy to check if you have swap space enabled, you can use the following command in the terminal to check if swap space is enabled:

sudo swapon --show

What command should I use to create a swap file on Ubuntu 20.04?

To create a swap file, you can use the dd command to allocate space and the mkswap command to set it up as swap space. here is an example for this command:

sudo fallocate -l [size]G /swapfile && sudo chmod 600 /swapfile && sudo mkswap /swapfile && sudo swapon /swapfile

How can I add a swap partition to my Ubuntu 20.04 system??

You can use the mkswap command to set up an existing partition as swap space and the swapon command so that you can enable it, for example (Remove the partition to the partition identifier (example – /dev/sda3):

sudo mkswap /dev/[partition]
sudo swapon /dev/[partition]

What is the command to configure Ubuntu 20.04 to automatically mount swap space on boot?

To configure Ubuntu 20.04 to automatically mount swap space on boot, you can edit the /etc/fstab file, here is an example for this:

sudo nano /etc/fstab

Add the following line at the ending of the file:

/swapfile none swap sw 0 0

How can I resize an existing swap file on Ubuntu 20.04?

You can use the following commands to resize an existing swap file (you will have to replace the [new size] with the new size of the swap file you want to set in gigabytes):

sudo swapoff /swapfile
sudo fallocate -l [new size]G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

Swap file takes space in the disk storage and later act as a memory for computation whenever the RAM in our system is full, it is important to create swap space in the Ubuntu system if you feel like your physical RAM is not enough to compute the work, the swap space can be created without any third party software because the ubuntu has a built-in feature for creating swap space files.