How to add Swap file in Linux

2024-02-20

Create a file that will be used for swap
```
sudo fallocate -l 4G /swapfile
```
Set the correct permissions for swap file
```
sudo chmod 600 /swapfile
```
Use the mkswap utility to set up the file as Linux swap area
```
sudo mkswap /swapfile
```
Enable the swap with the following command
```
sudo swapon /swapfile
```
if Need to make the change permanent, then update the /etc/fstab file and append the following line
```
/swapfile swap swap defaults 0 0
```
To verify that the swap is active
```
sudo swapon --show
free -h
```