DigitalOceanにDocker MachineでCentOS7をプロビジョンする方法 ref: http://qiita.com/zembutsu/items/04f896a96d0fc857f3a7

file0.txt

$ export $do_token='自分のAPI_token'
$ docker-machine create \
    --driver digitalocean \
    --digitalocean-access-token $do_token  \
    --digitalocean-region sgp1 \
    --digitalocean-size 2gb \
    --digitalocean-image centos-7-0-x64 \
     centos7-docker

file1.txt

Running pre-create checks...
Creating machine...
(centos7-docker) Creating SSH key...
(centos7-docker) Creating Digital Ocean droplet...
(centos7-docker) Waiting for IP address to be assigned to the Droplet...
Waiting for machine to be running, this may take a few minutes...
Detecting operating system of created instance...
Waiting for SSH to be available...
Detecting the provisioner...
Provisioning with centos...
Copying certs to the local machine directory...
Copying certs to the remote machine...
Setting Docker configuration on the remote daemon...
Checking connection to Docker...
Docker is up and running!
To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: (snip)

file2.txt

$ docker-machine ls
NAME             ACTIVE   DRIVER         STATE     URL                          SWARM   DOCKER    ERRORS
centos7-docker   -        digitalocean   Running   tcp://<ip>:2376             v1.10.3

file3.txt

$ docker-machine ssh centos7-docker
Last login: Thu Mar 31 07:17:47 2016 from xxx
[root@centos7-docker ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
[root@centos7-docker ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

file4.txt

$ curl -H "Authorization: Bearer $do_token" \
    -X GET "https://api.digitalocean.com/v2/images" | jq "."

file5.txt

{
  "images": [
    {
（省略）
    {
      "id": 16040476,
      "name": "7.2 x64",
      "distribution": "CentOS",
      "slug": "centos-7-0-x64",
      "public": true,
      "regions": [
        "nyc1",
        "sfo1",
        "nyc2",
        "ams2",
        "sgp1",
        "lon1",
        "nyc3",
        "ams3",
        "fra1",
        "tor1"
      ],
      "created_at": "2016-02-29T21:17:07Z",
      "min_disk_size": 20,
      "type": "snapshot"
    },
（省略）