Determine the size of the new swap file in megabytes and multiply by 1024 to determine the number of blocks. For example, the block size of a 64 MB swap file is 65536.
At a shell prompt as root, type the following command with
count being equal to the desired block size:
dd if=/dev/zero of=/swapfile bs=1024 count=65536
Change the persmissions of the newly created file:
chmod 0600 /swapfile
Setup the swap file with the command:
To enable the swap file immediately but not automatically at boot time:
To enable it at boot time, edit
/etc/fstab to include the following entry:
/swapfile swap swap defaults 0 0
The next time the system boots, it enables the new swap file.
After adding the new swap file and enabling it, verify it is enabled by viewing the output of the command
cat /proc/swaps or