@Override
        protected void start() {
            log.info("Creating docker machine \"%s\" with args %s",
                     machine.getName(),
                     machine.getCreateOptions() != null ? machine.getCreateOptions().toString() : "");
            log.info("This might take a while ...");
            start = System.currentTimeMillis();
        }
launch docker-machine to obtain environment settings
src/main/java/io/fabric8/maven/docker/access/DockerMachine.java