Add 4 GB swapspace on Ubuntu 14.04

add_swap.sh

# based on https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04
# run with eval "$(curl -sL https://gist.githubusercontent.com/czechboy0/ba249dc375dd6335f30f7acd593aa193/raw/add_swap.sh)"

echo "Starting with swap table:"
sudo swapon -s

echo "Available space:"
df -h

echo "Creating a 4GB swap file"
sudo fallocate -l 4G /swapfile
ls -lh /swapfile
sudo chmod 600 /swapfile

echo "Enabling swap file"
sudo mkswap /swapfile
sudo swapon /swapfile

echo "Current swap files:"
sudo swapon -s

echo "Enabling swap for after reboot"
echo "/swapfile   none    swap    sw    0   0" >> /etc/fstab

echo "Setting swappiness to 10"
sudo sysctl vm.swappiness=10
echo "vm.swappiness=10" >> /etc/sysctl.conf

echo "Setting cache pressure to 50"
sudo sysctl vm.vfs_cache_pressure=50
echo "vm.vfs_cache_pressure = 50" >> /etc/sysctl.conf

echo "You might want to reboot now just for good measures :)"