#! /bin/bash

sudo -i
echo "Create '/swapfile'"
fallocate -l "$1G" /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile

echo ""
echo "Swap status:"
swapon -s
echo ""

echo ""
echo "Mem status:"
free -m
echo ""

echo "Mount swap to fstab."
echo '/swapfile   none    swap    sw    0   0' >> /etc/fstab

echo "Set swapniess to 10"
sysctl vm.swappiness=10
echo vm.swappiness=10 >> /etc/sysctl.conf

echo "Set vfs cache pressure to 50"
sysctl vm.vfs_cache_pressure=50
echo vm.vfs_cache_pressure = 50 >> /etc/sysctl.conf