Create Swap File on Linux Ubuntu

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SBCODE

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Published on December 19, 2017 10:37:43 AM ● Video Link: https://www.youtube.com/watch?v=hXb50RxB-YU

Duration: 5:08

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I am using version 16.04 LTS.
In this video I experiment with performance by creating a ram swap file.
Below are the commands I used

Check if I have an existing swap
~# sudo swapon -s

Double checked using free
~# free -m

List available disks to see which I want to use for the new swap
~# df -h

Chose my disk, then allocated 4gb to a new file called swapfile
~# sudo fallocate -l 4G /swapfile

Verified it now exists
~# ls -lh /swapfile

Adjusted permissions so only root can use it
~# sudo chmod 600 /swapfile

Verified changes again
~# ls -lh /swapfile

Convert it to a real swapfile
~# sudo mkswap /swapfile

Turn it on
~# sudo swapon /swapfile

Checked it's usage
~# sudo swapon -s

Checked it using free
~# free -m

Now make it permanent in case of os reboot
~# sudo nano /etc/fstab

Added line below to file
/swapfile none swap sw 0 0

Press Ctrl X, then Y , then enter, to exit nano and save it back to disk

After a while htop showed me the swap file was now being used. You can check again using
~# sudo swapon -s