是否引用Docker for Mac测试版？如果是这样，那么你不必创建一个docker-machine（VM）。你可以使用Docker本机。只需打开终端并执行任何docker命令。

How do I create docker-machine from Command-Line?
I using Docker for mac(not Docker toolbox).

In Docker toolbox (this is not Docker for Mac), I could create docker-machine like docker-machine create -d virtualbox default

But now, I don't know default driver name of Docker for mac.

What is driver name?

Are referring Docker for Mac beta? If so, then you don't have to create a docker-machine (VM). You can use Docker natively. Just open the terminal and execute any docker command.