Rashid Jamil

Using a swapfile to increase the swap space on your system

This can be a very handy function if we want to use a file, instead of a partition, and with modern filesystems the performance is almost on par with using a dedicated partition for your swap area.

1. Using dd lets make a zero’d file for the swap

dd if=/dev/zero of=/swapfile bs=1048576 count=1000

This example would create a swapfile of 1 gig using a blocksize of a megabyte (1048576).

2. Make file as a swapfile

mkswp /swapfile

3. Activate swapfile

swapon /swapfile

4. Verify that our swapfile has been activated

swapon -s

We should see something like this in the list ..

Filename Type Size Used Priority /swapfile file 9999992 0 -2

If you want to have this a permanent solution, then adding the entry to fstab would probally be a better idea, open up /etc/fstab in your favourite editor and add the following line.

/swapfile swap swap defaults 0 0

Rashid Jamil

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