Swap space is hard disk space that extends system RAM
Create a swap file (or partition)

dd if=/dev/zero of=/var/local/swapfile bs=1k count=1M

Write special signature

mkswap /var/local/swapfile

Add entry to /etc/fstab
/var/local/swapfile swap swap defaults 0 0
Activate swap space

swapon -a

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