Swapfile about and resizeing

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.

        Turn off all swap processes

        1

        sudo swapoff -a

        Resize the swap

        2

        sudo dd if=/dev/zero of=/swapfile bs=1G count=8

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

        Make the file usable as swap

        2

        sudo mkswap /swapfile

        Activate the swap file

        3

        sudo swapon /swapfile

        Check the amount of swap available

        4

        grep SwapTotal /proc/meminfo


DONE!