[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

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