Skip to content

An Alpine Linux base image containing Elixir, Erlang, Node, Hex, and Rebar. Ready for Phoenix applications!

License

Notifications You must be signed in to change notification settings

bitwalker/alpine-elixir-phoenix

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

95 Commits
 
 
 
 
 
 
 
 
 
 
 
 

Repository files navigation

Elixir/Phoenix on Alpine Linux

This Dockerfile provides everything you need to run your Phoenix application in Docker out of the box.

It is based on my alpine-erlang image, and installs Elixir (1.11.0), Node.js (12.18.x), Hex and Rebar. It can handle compiling your Node and Elixir dependencies as part of it's build.

Usage

NOTE: This image is intended to run in unprivileged environments, it sets the home directory to /opt/app, and makes it globally read/writeable. If run with a random, high-index user account (say 1000001), the user can run an app, and that's about it. If run with a user of your own creation, this doesn't apply (necessarily, you can of course implement the same behaviour yourself). It is highly recommended that you add a USER default instruction to the end of your Dockerfile so that your app runs in a non-elevated context.

To boot straight to a prompt in the image:

$ docker run --rm -it --user=1000001 bitwalker/alpine-elixir-phoenix iex
Erlang/OTP 23 [erts-11.1.1] [source] [64-bit] [smp:3:3] [ds:3:3:10] [async-threads:1]

Interactive Elixir (1.11.0) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>

Extending for your own application:

FROM bitwalker/alpine-elixir-phoenix:latest

# Set exposed ports
EXPOSE 5000
ENV PORT=5000 MIX_ENV=prod

# Cache elixir deps
ADD mix.exs mix.lock ./
RUN mix do deps.get, deps.compile

# Same with npm deps
ADD assets/package.json assets/
RUN cd assets && \
    npm install

ADD . .

# Run frontend build, compile, and digest assets
RUN cd assets/ && \
    npm run deploy && \
    cd - && \
    mix do compile, phx.digest

USER default

CMD ["mix", "phx.server"]

It is recommended when using this that you have the following in .dockerignore when running docker build:

_build
deps
assets/node_modules
test

This will keep the payload smaller and will also avoid any issues when compiling dependencies.

Multistage Docker Builds

You can also leverage docker multistage build and bitwalker/alpine-elixir to lower your image size significantly.

An example is shown below:

FROM bitwalker/alpine-elixir-phoenix:latest AS phx-builder

# Set exposed ports
ENV MIX_ENV=prod

# Cache elixir deps
ADD mix.exs mix.lock ./
RUN mix do deps.get, deps.compile

# Same with npm deps
ADD assets/package.json assets/
RUN cd assets && \
    npm install

ADD . .

# Run frontend build, compile, and digest assets
RUN cd assets/ && \
    npm run deploy && \
    cd - && \
    mix do compile, phx.digest

FROM bitwalker/alpine-elixir:latest

EXPOSE 5000
ENV PORT=5000 MIX_ENV=prod

COPY --from=phx-builder /opt/app/_build /opt/app/_build
COPY --from=phx-builder /opt/app/priv /opt/app/priv
COPY --from=phx-builder /opt/app/config /opt/app/config
COPY --from=phx-builder /opt/app/lib /opt/app/lib
COPY --from=phx-builder /opt/app/deps /opt/app/deps
COPY --from=phx-builder /opt/app/.mix /opt/app/.mix
COPY --from=phx-builder /opt/app/mix.* /opt/app/

# alternatively you can just copy the whole dir over with:
# COPY --from=phx-builder /opt/app /opt/app
# be warned, this will however copy over non-build files

USER default

CMD ["mix", "phx.server"]

License

MIT

About

An Alpine Linux base image containing Elixir, Erlang, Node, Hex, and Rebar. Ready for Phoenix applications!

Resources

License

Stars

Watchers

Forks

Packages

No packages published