Ubuntu create swap space

create-swap.sh

#!/bin/sh

swapsize=2048

grep -q "swapfile" /etc/fstab

if [ $? -ne 0 ]; then
	echo 'swapfile not found. Adding swapfile.'
	fallocate -l ${swapsize}M /swapfile
	chmod 600 /swapfile
	mkswap /swapfile
	swapon /swapfile
	echo '/swapfile none swap defaults 0 0' >> /etc/fstab
	sysctl vm.swappiness=10
	echo 'vm.swappiness=10' >> /etc/sysctl.conf
	sysctl vm.vfs_cache_pressure=50
	echo 'vm.vfs_cache_pressure=50' >> /etc/sysctl.conf
else
	echo 'swapfile found. No changes made.'
fi

cat /proc/swaps
cat /proc/meminfo | grep Swap