71 lines
3.2 KiB
Markdown
Executable File
71 lines
3.2 KiB
Markdown
Executable File
## Create a Docker Machine
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You can use [Docker Machine](https://docs.docker.com/machine/) to provision a new host, or to connect to an existing host. In either case, the result will be a "machine" configured on your local workstation or laptop that represents the remote host. After you activate the machine on your local workstation, when you run `docker` commands locally, Docker Machine will execute them on the remote host for you.
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### Provision a new host
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Docker Machine can provision new hosts on various platforms using one of its [supported drivers](https://docs.docker.com/machine/drivers/). When provisioning a host, Docker Machine will automatically install the latest version of [Docker Engine](https://www.docker.com/products/docker-engine) on the host. It will also generate local TLS certificate and key files to connect to the host and authenticate with the `docker` daemon on the host.
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In the following example, we provision a new virtual server on [IBM SoftLayer](https://www.softlayer.com/promo/freeCloud/freecloud). (You can provision similarly on RackSpace, AWS, and other hosting providers). We set `DRIVER_OPTS` to the SoftLayer-specific options.
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```
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# Set Docker Machine SoftLayer driver options
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export DRIVER_OPTS="--driver softlayer \
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--softlayer-api-key <my_softlayer_api_key> \
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--softlayer-user <my_softlayer_username> \
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--softlayer-domain mydomain \
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--softlayer-cpu 16 \
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--softlayer-memory 65536 \
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--softlayer-disk-size 100 \
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--softlayer-region wdc01"
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# Create a machine named jupyterhub
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docker-machine create $DRIVER_OPTS jupyterhub
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```
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### Connect to an existing host
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This example configures a "machine" on your local workstation that connects to an existing remote host at IP address `10.0.0.10`. To do this, you must use Docker Machine's `generic` driver, and your local workstation must have a private SSH key that allows you to perform password-less login to the host.
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Substitute your own IP address and path to SSH key in the `DRIVER_OPTS` below. Note that when you run the `docker-machine create` command, Docker Machine will install and configure the latest Docker Engine on the remote host (or upgrade the Docker Engine on the host if it is already installed).
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```
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# Use the generic driver to create a Docker machine that
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# controls the Docker daemon on an existing host
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export DRIVER_OPTS="--driver generic \
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--generic-ip-address 10.0.0.10 \
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--generic-ssh-key /Users/jtyberg/.ssh/myhost_rsa.pem"
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# Create a machine named jupyterhub
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docker-machine create $DRIVER_OPTS jupyterhub
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```
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## Activate Docker Machine
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You must set specific `DOCKER_*` environment variables to tell `docker` that it should run commands against a particular machine. The remainder of this document assumes that the machine called `jupyterhub` is active, and therefore, all `docker` commands will run on the `jupyterhub` remote host.
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To set the `jupyterhub` machine as active:
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```
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eval "$(docker-machine env jupyterhub)"
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```
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All this does is set the right environment variables:
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```
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env|grep DOCKER
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DOCKER_HOST=tcp://10.0.0.10:2376
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DOCKER_MACHINE_NAME=jupyterhub
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DOCKER_TLS_VERIFY=1
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DOCKER_CERT_PATH=/Users/jtyberg/.docker/machine/machines/jupyterhub
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```
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To see which machine is active:
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```
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docker-machine active
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```
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