docker-compose + development Phoenix

docker-compose.yml

version: "3.2"
services:
  postgres:
    image: mdillon/postgis:10
    environment:
      - POSTGRES_PASSWORD=
      - POSTGRES_USER=exchange
      - PG_DATA=/var/lib/postgresql/data
    ports:
      - "15432:5432"
    volumes:
      - ./pg_data:/var/lib/postgresql/data
  exchange:
    build:
      context: ./
      dockerfile: Dockerfile.dev
    volumes:
      - type: bind
        source: ./
        target: /app
    ports:
      - "4000:4000"
    depends_on:
      - postgres
    command:
      - ./bin/run.sh

Dockerfile.dev

FROM cargosense/elixir-ubuntu:20.2-v1.6.2

# Install debian packages
RUN apt-get update
RUN apt-get install -y 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

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

export PGPASSWORD="FIXME-YOUR-PASSWORD"

# 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

# Wait for Postgres to become available.
until psql -h postgres -U "FIXME-YOUR-DB-USER" -c '\q' template1 2>/dev/null; do
  >&2 echo "Postgres is unavailable - sleeping"
  sleep 1
done

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

if psql -h postgres -U "FIXME-YOUR-DB-USER" -c '\q' FIXME_YOUR_DB_NAME 2>/dev/null;
then
  echo "Database already setup"
else
  mix ecto.setup
fi

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