Enable swap allocation

swapon.sh

# swap space allocation
sudo fallocate -l 1G /var/swap.1
# or use following command that agnostic about distro
#sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo chmod 600 /var/swap.1
sudo /sbin/mkswap /var/swap.1
sudo /sbin/swapon /var/swap.1

# check if swap is up in the right way
sudo swapon --show

# (optionally) works to mount swap automatically with fstab on restart machine
sudo cp /etc/fstab /etc/fstab.bak
echo '/var/swap.1 none swap sw 0 0' | sudo tee -a /etc/fstab
sudo sysctl vm.swappiness=10
echo 'vm.swappiness=10' | sudo tee -a /etc/sysctl.conf
sudo sysctl vm.vfs_cache_pressure=50
echo 'vm.vfs_cache_pressure=50' | sudo tee -a /etc/sysctl.conf