50 lines
2.2 KiB
Markdown
50 lines
2.2 KiB
Markdown
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---
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title: Elixir on Heroku with Docker Containers
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---
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It is possible to deploy your Elixir application on Heroku using the [Elixir Buildpack
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](https: //github.com/HashNuke/heroku-buildpack-elixir). However, you may want to deploy using Docker on Heroku instead. Perhaps your application has complex setup or configuration needs. Or perhaps you already have a Docker-ified application and you don’t want to have to do extra work to convert it to buildpacks and Procfiles.
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Heroku supports Docker via the [Container Registry and Runtime](https://devcenter.heroku.com/articles/container-registry-and-runtime). Here’s the process of getting it set up:
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1. Create a Heroku application with `heroku create <app_name>`.
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2. Set the Heroku stack to “container” `heroku set:stack container`. This enables the container functionality and ensures that Heroku doesn’t become confused if your project also contains other manifests (such as package.json or Gemfile).
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3. Set up your Docker environment to talk to Heroku’s Docker registry instead of the default Docker registry: `heroku container:login`.
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4. Build the image and push it to the Heroku registry: `heroku container:push web`.
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5. Deploy it to your dynos: `heroku container:release web`.
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6. Check your site and make sure everything works.
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7. If your application does not boot and logs the error message `Shall I install Hex? (if running non-interactively, use \"mix local.hex --force\") [Yn] ** (Mix) Could not find an SCM for dependency :phoenix from <app_name>.Mixfile`, you may have to make a small change to your Dockerfile.
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- Add ENV MIX_HOME=/opt/mix before you install hex & rebar in your Dockerfile. The reason this is needed from what I can gather is that Heroku’s Docker execution environment is different from your local development environment.
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For reference, here’s my full Dockerfile for my Phoenix application:
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```Dockerfile
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FROM elixir:1.8.0-alpine
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RUN apk add make gcc libc-dev
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ENV CC=gcc
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ENV MIX_HOME=/opt/mix
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RUN mix local.hex --force \\
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&& mix local.rebar --force
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WORKDIR /root/app
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ADD ./ /root/app/
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EXPOSE 4000
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ARG MIX_ENV=prod
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RUN echo ${MIX_ENV}
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ENV MIX_ENV=$MIX_ENV
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ENV PORT=4000
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RUN mix deps.get
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RUN mix deps.compile
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RUN MAKE=cmake mix compile
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RUN mix phx.digest
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CMD [\"mix\", \"phx.server\"]
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```
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