Checking the System for Swap Information

Before we begin, we can check if the system already has some swap space available. It is possible to have multiple swap files or swap partitions, but generally one should be enough.

We can see if the system has any configured swap by typing:

sudo swapon --show

If you don’t get back any output, this means your system does not have swap space available currently.

You can verify that there is no active swap using the free utility:

free -h


              total        used        free      shared  buff/cache   available
Mem:           985M         84M        222M        680K        678M        721M
Swap:            0B          0B          0B


As you can see in the Swap row of the output, no swap is active on the system.