How to Create a Swap File on CentOS Stream 9

To create a swap file on CentOS Stream 9, follow these steps.

Step 1 : Begin by checking the current free memory on your system using the following command:

free -m

Step 2 : Verify the available disk space on your system using:

df -h

Step 3 : Create Swap File. Allocate space for the swap file. In this example, a 2GB swap file is created:

sudo fallocate -l 2G /swapfile

Step 4 : Adjust the permissions of the swap file for security:

sudo chmod 600 /swapfile

Step 5 : Mark the file as swap space:

sudo mkswap /swapfile

Step 6 : Activate the swap file:

sudo swapon /swapfile

Step 7 : Confirm that the swap file is active:

sudo swapon --show

Step 8 : To ensure the swap file is activated on boot, add the following line to /etc/fstab:

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

Congratulations! You have successfully created a swap file on CentOS Stream 9.