# SWAP on Linux

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Published 2021-08-29

# enabling SWAP on a Centos 7

sudo dd if=/dev/zero of=/swapfile count=2048 bs=1MiB

sudo chmod 600 /swapfile

sudo mkswap /swapfile

sudo swapon /swapfile

Then edit the /etc/fstab file, and add following line to the end:

/etc/fstab
/swapfile   swap    swap    sw  0   0

sudo swapoff -v /swapfile

next, remove the swap file entry /swapfile swap swap defaults 0 0 from /etc/fstab file

and, delete the swapfile with rm command

sudo rm /swapfile

sudo fallocate -l 1G /swapfile

sudo chmod 600 /swapfile

sudo mkswap /swapfile

sudo swapon /swapfile

Backing up /etc/fstab file

sudo cp /etc/fstab /etc/fstab.bak

echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab