[HowTo] Change swap size in Linux (Ubuntu)

From Ubuntu 17, the swap partition was replaced by a swap file. The main advantage of the swap file is easy resizing.

In the following example, we will change the swap size from 2 GB to 4 GB.

• Turn off the swap

  sudo swapoff -a

• Resize the swap

  sudo dd if=/dev/zero of=/swapfile bs=1G count=4

  if = input file
  of = output file
  bs = block size count = multiplier of blocks
• Make the file as swap

  sudo mkswap /swapfile

• Activate the swap file

  sudo swapon /swapfile

• Check the amount of swap available

  grep SwapTotal /proc/meminfo