Raspberry PI: How to Increase swapfile

1. Confirm the current swap file status
   ==========================

pi@raspberrypi ~ $ swapon -s

Filename                                Type            Size    Used    Priority
/var/swap                               file            102396  0       -1

2. Stop dphys-swapfile
   ==========================

pi@raspberrypi ~ $ sudo /etc/init.d/dphys-swapfile stop

Stopping dphys-swapfile swapfile setup ..., done.

3. Modify dphys-swapfile conf File
   ==========================

Change the value of CONF_SWAPSIZE (in MB) (e.g. 1GB)

pi@raspberrypi ~ $ sudo vi /etc/dphys-swapfile

CONF_SWAPSIZE=1024

4. Start dphys-swapfile
   ===========================

pi@raspberrypi ~ $ sudo /etc/init.d/dphys-swapfile start

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

5. Confirm the increased swap file
   ===========================

pi@raspberrypi ~ $ swapon -s

Filename                                Type            Size    Used    Priority
/var/swap                               file            1048572 0       -1

6. Confirm by meminfo
   ===========================

pi@raspberrypi ~ $ cat /proc/meminfo

MemTotal:         497764 kB
MemFree:          361356 kB
...
SwapTotal:       1048572 kB
SwapFree:        1048572 kB
...