How to Create a Swap File on Rocky Linux 9

To create a swap file on Rocky Linux 9, follow these steps.

Step 1 : Begin by checking the available system memory using the command:

free -m

Step 2 : Verify the available disk space using:

df -h

Step 3 : Allocate 2GB of space for the swap file using the fallocate command.

sudo fallocate -l 2G /swapfile

Step 4 : Set proper permissions on the swap file.

sudo chmod 600 /swapfile

Step 5 : Configure the swap file using mkswap.

sudo mkswap /swapfile

Step 6 : Activate the swap file.

sudo swapon /swapfile

Step 7 : Verify the swap file is active.

sudo swapon --show

Step 8 : Update /etc/fstab

- Ensure the swap file is persistent across reboots by modifying the /etc/fstab file:

sudo nano /etc/fstab

- Add the following line:

/swapfile none swap sw 0 0

Congratulations! You have successfully created and configured a swap file on Rocky Linux 9.