Create SWAP in Ubuntu

create-swap-ubuntu.sh

#!/bin/bash

set -e

# $1 - arg1, swap size in G (e.g 1G)
if [ -z $1 ]; then
        echo "Error! Please provide swap size in G as argument."
        echo "Example: create-swap-ubuntu.sh 1G"
        exit 1
else
        sudo fallocate -l $1 /swapfile
        sudo chmod 600 /swapfile
        sudo mkswap /swapfile
        sudo swapon /swapfile
        sudo swapon --show
        sudo cp /etc/fstab /etc/fstab.bak
        echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

        # Adjust cache pressure setting
        sudo sysctl vm.swappiness=10
        sudo sysctl vm.vfs_cache_pressure=50

        # Make changes permanent
        echo "vm.swappiness=10" | sudo tee -a /etc/sysctl.conf
        echo "vm.vfs_cache_pressure=50" | sudo tee -a /etc/sysctl.conf
fi