create_swap_file.sh

# Swap should take place on the Instance Storage (ephemeral) disk and not an EBS device. 
# Check that your ephemeral storage is mounted sudo mount /dev/xvda2 /mnt
sudo dd if=/dev/zero of=/mnt/swapfile bs=1M count=16348 # create 16G swap
# Permission
sudo chown root:root /mnt/swapfile
sudo chmod 600 /mnt/swapfile
# Activate swapfile
sudo mkswap /mnt/swapfile
sudo swapon /mnt/swapfile
# add this to /etc/fstab
/mnt/swapfile swap swap defaults 0 0
# Activate swap 
sudo swapon -a
# Config file to settle option
sudo nano /etc/sysctl.conf