Docker Machine 介绍
Docker Machine是一个简化Docker安装的命令行工具，通过一个简单的命令行即可在相应的平台上安装Docker，比如VirtualBox、
Digital Ocean、Microsoft Azure。
使用过程：
$ docker-machine create -d virtualbox dev INFO[0000] Creating SSH key... INFO[0000] Creating VirtualBox VM... INFO[0007] Starting VirtualBox VM... INFO[0007] Waiting for VM to start... INFO[0041] "dev" has been created and is now the active machine. INFO[0041] To point your Docker client at it, run this in your shell: $(docker-machine env dev) $ docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM dev * virtualbox Running tcp://192.168.99.127:2376 $ $(docker-machine env dev) $ docker run busybox echo hello world Unable to find image 'busybox:latest' locally 511136ea3c5a: Pull complete df7546f9f060: Pull complete ea13149945cb: Pull complete 4986bf8c1536: Pull complete hello world $ docker-machine create -d digitalocean --digitalocean-access-token=secret staging INFO[0000] Creating SSH key... INFO[0001] Creating Digital Ocean droplet... INFO[0002] Waiting for SSH... INFO[0070] Configuring Machine... INFO[0109] "staging" has been created and is now the active machine. INFO[0109] To point your Docker client at it, run this in your shell: $(docker-machine env staging) $ docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM dev virtualbox Running tcp://192.168.99.127:2376 staging * digitalocean Running tcp://104.236.253.181:2376