How to adjust swap size?

Q&A
1

I want to resize the swap size to 8GiB.

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2 
sudo swapoff /var/swapfile
sudo dd if=/dev/zero of=/var/swapfile bs=1GiB count=8
sudo mkswap /var/swapfile
sudo chmod 0600 /var/swapfile
sudo swapon /var/swapfile
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