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Chris Biscardi

Docker Machine

In this post, I will record the process through which I attempt to use Docker Machine to deploy a simple Haskell application on Digital Ocean.

Zero to Docker

To get an OSX docker machine running, I had to download two binaries: machine and a version of docker with Identity Authentication. I will refer to these as machine-docker and machine-docker-1.3.1-dev-identity-auth respectively. machine-docker is a new binary while machine-docker-1.3.1-dev-identity-auth is the usual docker binary with some additional commits.

  1. Create an OSX machine using virtualbox. Name it test-machine:
bash
> machine-docker create -d virtualbox test-machine
INFO[0000] Downloading boot2docker...
INFO[0021] Creating SSH key...
INFO[0021] Creating VirtualBox VM...
INFO[0029] Starting VirtualBox VM...
INFO[0029] Waiting for VM to start...
INFO[0061] "test-machine" has been created and is now the active
           machine. To point Docker at this machine, run: export
           DOCKER_HOST=$(machine url) DOCKER_AUTH=identity
  1. Create a function to export the desired env vars. I put this in my ~/.zshrc
bash
to-machine(){
    export DOCKER_HOST=$(machine-docker url) DOCKER_AUTH=identity
}
  1. Test with docker ps in a new shell:
bash
> to-machine
> machine-docker-1.3.1-dev-identity-auth ps
CONTAINER ID  IMAGE  COMMAND  CREATED  STATUS  PORTS  NAMES

Docker to Digital Ocean

  1. Create a Personal Access Token

digital ocean application settings

  1. Name and Generate the token

Screenshot 2014-12-20 14.58.47

  1. After getting a token, I set it to DO_TOKEN:
bash
export DO_TOKEN=mytokenhere235bhn2b23j5k
  1. Create a machine on Digital Ocean
bash
> machine-docker create -d digitalocean --digitalocean-access-token=$DO_TOKEN biscarch/bot
INFO[0000] Creating SSH key...
INFO[0000] Creating Digital Ocean droplet...
INFO[0002] Waiting for SSH...
INFO[0103] "biscarch/bot" has been created and is now the active
           machine. To point Docker at this machine, run: export
           DOCKER_HOST=$(machine url) DOCKER_AUTH=identity
  1. Point Docker at the Digital Ocean Machine biscarch/bot
bash
> to-machine
  1. docker ps on Digital Ocean
bash
> machine-docker-1.3.1-dev-identity-auth ps
The authenticity of host "$ip:$port" can't be established.
Remote key ID XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX
Are you sure you want to continue connecting (yes/no)? yes
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

docker run on Digital Ocean

  1. We can run an image using the barebones image from Snap for Beginners interactively with a pseduo-tty:
bash
> machine-docker-1.3.1-dev-identity-auth run -itp 8000:8000 snapforbeginners/barebones
no port specified, defaulting to port 8000
Listening on http://0.0.0.0:8000/
  1. We can curl our Digital Ocean machine’s IP to see if the container is running:
bash
> curl $DO_IP:8000
hello world

Fin

That’s it. We have a Docker Engine and a container running on Digital Ocean. We can also run multiple containers as Daemons and all of the normal goodness of the Docker CLI.