#!/bin/bash
set -exo pipefail

# https://www.linode.com/docs/guides/how-to-increase-swap-space-in-ubuntu/
# https://help.ubuntu.com/community/SwapFaq

sudo swapon --show
free -h
df -h

if [ -f /swapfile ]; then
    set +x
    echo "Already exists"
    exit 1
fi;

sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

sudo swapon --show
free -h
df -h

sudo cp /etc/fstab /etc/fstab.bak
echo "/swapfile       swap            swap    defaults          0     0" | sudo tee -a /etc/fstab
sudo sysctl vm.swappiness=50
echo "vm.swappiness=50" | sudo tee -a /etc/fstab

sudo swapon --show