More swap space for a docker machine.

allocate.sh

for i in $(docker-machine ls | awk '{print $1}'); do
   docker-machine ssh $i -- ls /swapfile || docker-machine ssh $i "fallocate -l 512M /swapfile && chmod 400 /swapfile && mkswap /swapfile" &&
   docker-machine ssh $i "swapon /swapfile && echo '/swapfile none swap defaults 0 0' >> /etc/fstab" &>/dev/null;
done

boot2docker complains about fallocate not being present, any idea how to overcome this?

@arvindkumarc and googlers you can use dd instead of fallocate:

# dd if=/dev/zero of=/swapfile bs=1M count=512