linux-create-swap-area

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Swap is an area on a hard drive that has been designated as a place where the operating system can temporarily store data that it can no longer hold in RAM.

Create empty file on disk

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sudo dd if=/dev/zero of=/opt/swap bs=1024 count=2048000

Make swap

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sudo mkswap /opt/swap

Change permission

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sudo chmod 600 /opt/swap

Enable

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sudo swapon /opt/swap

Check result

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~ # free -m
              total        used        free      shared  buff/cache   available
Mem:           3921          90        1567           1        2263        3543
Swap:           974         107         867

              total        used        free      shared  buff/cache   available
Mem:           3921          92        1565           1        2263        3542
Swap:          2974         106        2868

Disable

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sudo swapoff /opt/swap

Remove file on disk

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sudo rm -f /opt/swap