Hetzner is an unofficial driver for docker-machine. This means you need to install the driver for hetzner separately before you can use it.

1. Download the latest version of the driver from https://github.com/JonasProgrammer/docker-machine-driver-hetzner/releases
2. Extract the binary and place it in your PATH.

For example on Linux you can do:

wget https://github.com/JonasProgrammer/docker-machine-driver-hetzner/releases/download/2.0.1/docker-machine-driver-hetzner_2.0.1_linux_amd64.tar.gz
tar -xvf docker-machine-driver-hetzner_2.0.1_linux_amd64.tar.gz
sudo install --mode +x docker-machine-driver-hetzner /usr/local/bin/

Provider Configuration for Hetzner

Example configuration file:

{
    "provider": "hetzner",
    "apiToken": "CHANGEME!",
    "s3":{
        "accessKey": "CHANGEME!",
        "secretKey": "CHANGEME!",
        "endpoint": "CHANGEME!",
        "bucket": "CHANGEME!",
        "ignoreSSL": false
    },

    "maxRuntime": -1,
    "maxUploadTime": -1,
    "machinesLimit": -1,
    "createRetries": 1,
    "location": "fsn1",

    "image": "ubuntu-18.04",
    "snapshot": false,
    "engineInstallUrl": "\"https://releases.rancher.com/install-docker/19.03.9.sh\"",

    "sshKey":{
        "fingerprint": "",
        "path": "",
    },

    "imageSizeMapping": [
        {"maxImages": 5, "slug": "cx11"},
        {"maxImages": 50, "slug": "cx21"}
    ],
    "minImages": -1,

    "addSwap": 1,
    "dockerImage": "webodm/nodeodx",

    "dockerRegistry":{
        "username": "",
        "password": "",
        "url": ""
    } 
}

Field	Description
apiToken	Hetzner API Token
s3	S3 keys and bucket configuration
machinesLimit	Maximum number of machines that are allowed to run at the same time. Set to -1 for no limit.
createRetries	Number of attempts to create a machine before giving up. Defaults to 1.
maxRuntime	Maximum number of seconds a machine is allowed to run ever. Set to -1 for no limit.
maxUploadTime	Maximum number of seconds a machine is allowed to receive file uploads. Set to -1 for no limit.
location	Location identifier where the machines should be created.
image	Image identifier (from public images) or snapshot identifier (private) if snapshot is set to true (see below).
snapshot	When set to true, image refers to a snapshot in the user account instead of an image name. Useful to speed up boot time if you already have a machine with the docker image preloaded.
sshKey	Optionally specify an existing Hetzner SSH fingerprint and private key path instead of generating new keys.
imageSizeMapping	Max images count to machine size mapping. The autoscaler will pick a machine size based on the number of images of the incoming task. Use this to control what size of machine should correspond to which image count. The least powerful machine able to process a certain number of images is always selected.
minImages	Minimum number of images that a dataset needs to have for the autoscaler to be used (-1 = no minimum).
addSwap	Optionally add this much swap space to the machine as a factor of total RAM (RAM * addSwap). A value of 1 sets a swapfile equal to the available RAM.
dockerImage	Docker image to launch
dockerGpu	Enables GPU acceleration by passing --gpu all to docker
dockerRegistry	If pulling images from a private registry or repository, issue a docker login with these information