Permanent swap space in Ubuntu

If swap space is already active, the above command will output information about swap

this will allocate 4GB of disc space to swapfile.

We want to ensure that only root user can read and write to this newly created swap file.

After this command you should be able to see the swap swpace in overall computer memory. Check it using below command.

or the below command:

By default this swap file will go away after you rebootyour system. To persist changes across reboots, you need to add the swap entry into /etc/fstab file.

And paste the below line:

Swappiness value defines at what priority the swap space will be used by the operating system. Value can range from 0 (os avoids using swap) to 100 (os will aggressively use swap space). Default value of swap space could be around 30.

If you are using SSD, its better to keep system swappiness to a low value like 5 or 10 (so that lesser number of writes happen on swap)

30

Add the below line:

If you want to remove the swap space completely, you can follow these steps:

That’s all.