Put your Elixir app inside minimal Docker image. Based on alpine linux and distillery releases.

1. Add mix_docker to your list of dependencies in mix.exs:

```elixir
def deps do
  [{:mix_docker, "~> 0.3.0"}]
end
```

2. Configure Docker image name

```elixir
# config/config.exs
config :mix_docker, image: "recruitee/hello"
```

3. Run mix docker.init to init distillery release configuration

4. Run mix docker.build & mix docker.release to build the image. See Usage for more.

• Getting Started Tutorial
• Setting up cluster with Rancher

Run mix docker.build to build a release inside docker container

Run mix docker.release to put the release inside minimal docker image

Run mix docker.publish to push newly created image to docker registry

Run mix docker.shipit

Run mix docker.customize

Using ENV variables. The provided Docker images contain REPLACE_OS_VARS=true, so you can use "${VAR_NAME}" syntax in config/prod.exs like this:

config :hello, Hello.Endpoint,
  server: true,
  url: [host: "${DOMAIN}"]    

config :hello, Hello.Mailer,
  adapter: Bamboo.MailgunAdapter,
  api_key: "${MAILGUN_API_KEY}"

The easiest way is to docker exec into running container and run the following command, where CID is the app container IO and hello is the name of your app.

docker exec -it CID /opt/app/bin/hello remote_console

First, run mix docker.customize to copy Dockerfile.build and Dockerfile.release into your project directory. Now you can add whatever you like using standard Dockerfile commands. Feel free to add some more apk packages or run some custom commands. TIP: To keep the build process efficient check whether a given package is required only for compilation (build) or runtime (release) or both.