free -h
df -h /
fallocate -l 4G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
echo '/swapfile none swap sw 0 0' >> /etc/fstab
sysctl vm.swappiness=20
echo 'vm.swappiness=20' >> /etc/sysctl.conf
free -h
swapon --show

free -h
df -h /

fallocate -l 4G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile

echo ''/swapfile none swap sw 0 0'' >> /etc/fstab

sysctl vm.swappiness=20
echo ''vm.swappiness=20'' >> /etc/sysctl.conf

free -h
swapon --show