install docker-machine with vultr driver
#!/bin/bash
curl -L https://github.com/docker/machine/releases/download/v0.7.0/docker-machine-`uname -s`-`uname -m` > /usr/local/bin/docker-machine && \
chmod +x /usr/local/bin/docker-machine
curl -L https://github.com/janeczku/docker-machine-vultr/releases/download/v1.0.7/docker-machine-driver-vultr-v1.0.7-linux-amd64.tar.gz > /tmp/docker-machine-driver-vultr-v1.0.7-linux-amd64.tar.gz
tar xvfz /tmp/docker-machine-driver-vultr-v1.0.7-linux-amd64.tar.gz -C /usr/local/bin
chmod +x /usr/local/bin/docker-machine-driver-vultr