How to Change a Swap File on AlmaLinux 10

To change a swap file on AlmaLinux 10, follow the steps below to safely disable the old swap, create a new swap file, and enable it permanently.

Step 1 : Check Current Swap

View the active swap configuration:

swapon --show

Step 2 : Turn Off All Swap

Disable all active swap spaces:

sudo swapoff -a

Step 3 : Edit /etc/fstab

Open the fstab file and comment out the existing swap entry:

sudo nano /etc/fstab

Add # at the beginning of the line related to the old swap.

Step 4 : Create a New Swap File (4 GB Example)

sudo fallocate -l 4G /swapfile

Step 5 : Set Correct Permissions

Secure the swap file:

sudo chmod 600 /swapfile

Step 6 : Set Up the Swap Area

sudo mkswap /swapfile

Step 7 : Enable the New Swap File

sudo swapon /swapfile

Step 8 : Verify Swap Is Active

sudo swapon --show

Step 9 : Make Swap Permanent

Edit /etc/fstab again and add:

/swapfile none swap sw 0 0

Congratulations! You have successfully changed and configured a new swap file on AlmaLinux 10, ensuring your system uses the updated swap space correctly.