Change swap size in Ubuntu 18.04

Swap is a special area on your computer, which the operating system can use as additional RAM.
Starting with Ubuntu 17.04, the swap partition was replaced by a swap file. The main advantage of the swap file is easy resizing.

In the following example, we’ll extend the swap space available in the /swapfile from 4 GB to 8 GB.

    1. Turn off all swap processes
    2. Resize the swap

      if = input file
      of = output file
      bs = block size
      count = multiplier of blocks

    3. Make the file usable as swap
    4. Activate the swap file
    5. Check the amount of swap available