Swap configuration guide for Raspberry Pi

Check the available swap:

free -h

Turn off the swap:

sudo dphys-swapfile swapoff

Check that no swap is available:

free -h

Edit configuration:

sudo nano /etc/dphys-swapfile

In the configuration, change the value of CONF_SWAPSIZE as desired (in MiB):

# CONF_SWAPSIZE=200
CONF_SWAPSIZE=1024

Save and exit, then set up the swap file:

sudo dphys-swapfile setup

Expected output:

want /var/swap=1024MByte, checking existing: deleting wrong size file (104857600), generating swapfile ... of 1024MBytes

Enable swapping:

sudo dphys-swapfile swapon

Verify that the available swap is as desired:

free -h

Known issue

The default swap size in /etc/dphys-swapfile is 200. However, the actual swap available was 100 MiB (104857600).

Maybe a restart is needed to verify that this configuration guide works as intended.