#!/bin/bash

# Disable current swap
sudo swapoff -a
for file in $(cat /proc/swaps | awk "NR>1" | awk '{print $1}'); do
  echo "rm old swap $file"
  sudo rm ${file}
done
sudo sed -i "/swap/d" /etc/fstab

# Create new swap
size=$(free -m | grep 'Mem' | awk '{print $2}')
echo $size

sudo dd if=/dev/zero of=/swapfile count=${size} bs=1MiB

sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

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

free -h


# Update conf
sudo sed -i '/vm.swappiness/d' /etc/sysctl.conf
echo 'vm.swappiness = 10' | sudo tee -a /etc/sysctl.conf

sudo sed -i '/vm.vfs_cache_pressure/d' /etc/sysctl.conf
echo 'vm.vfs_cache_pressure=50' | sudo tee -a /etc/sysctl.conf

sudo sysctl -p