Elixir/Phoenix Docker-based Development Environment

docker-compose.yml

version: '3.2'
services:
  db:
    image: postgres

  web:
    build: .
    volumes:
      - type: bind
        source: .
        target: /app
    ports:
      - "4000:4000"
    depends_on:
      - db
    command:
      - ./run.sh

Dockerfile

# Elixir + Phoenix

FROM elixir:1.6.1

# Install debian packages
RUN apt-get update
RUN apt-get install --yes build-essential inotify-tools postgresql-client

# Install Phoenix packages
RUN mix local.hex --force
RUN mix local.rebar --force
RUN mix archive.install --force https://github.com/phoenixframework/archives/raw/master/phx_new.ez

# Install node
RUN curl -sL https://deb.nodesource.com/setup_6.x -o nodesource_setup.sh
RUN bash nodesource_setup.sh
RUN apt-get install nodejs

WORKDIR /app
EXPOSE 4000

run.sh

#!/bin/sh
# Adapted from Alex Kleissner's post, Running a Phoenix 1.3 project with docker-compose
# https://medium.com/@hex337/running-a-phoenix-1-3-project-with-docker-compose-d82ab55e43cf

set -e


# Ensure the app's dependencies are installed
mix deps.get

# Prepare Dialyzer if the project has Dialyxer set up
if mix help dialyzer >/dev/null 2>&1
then
  echo "\nFound Dialyxer: Setting up PLT..."
  mix do deps.compile, dialyzer --plt
else
  echo "\nNo Dialyxer config: Skipping setup..."
fi

# Install JS libraries
echo "\nInstalling JS..."
cd assets && npm install
cd ..

# Wait for Postgres to become available.
until psql -h db -U "postgres" -c '\q' 2>/dev/null; do
  >&2 echo "Postgres is unavailable - sleeping"
  sleep 1
done

echo "\nPostgres is available: continuing with database setup..."

# Potentially Set up the database
mix ecto.create
mix ecto.migrate

echo "\nTesting the installation..."
# "Proove" that install was successful by running the tests
mix test

echo "\n Launching Phoenix web server..."
# Start the phoenix web server
mix phx.server