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I am trying to deploy a Phoenix app with a Postgres database on Docker. I also intend to use Nginx as my reverse proxy ( but this is not the main agenda). So I have been using Phoenix Releases but somehow I have failed to run mix phx.server to start the system. Here is my Dockerfile :

# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
# instead of Alpine to avoid DNS resolution issues in production.
#
# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
# https://hub.docker.com/_/ubuntu?tab=tags
#
# This file is based on these images:
#
#   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20240701-slim - for the release image
#   - https://pkgs.org/ - resource for finding needed packages
#   - Ex: hexpm/elixir:1.17.2-erlang-27.0-debian-bullseye-20240701-slim
#
ARG ELIXIR_VERSION=1.17.2
ARG OTP_VERSION=27.0
ARG DEBIAN_VERSION=bullseye-20240701-slim

ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y && apt-get install -y build-essential git 
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && 
    mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

COPY priv priv

COPY lib lib

COPY run.sh ./

COPY assets assets

# compile assets
RUN mix assets.deploy

# Compile the release
RUN mix compile

# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && 
  apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates 
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen

ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8

WORKDIR "/app"
RUN chown nobody /app

# set runner ENV
ENV MIX_ENV="prod"

# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/my_app ./

USER nobody

EXPOSE 4000

# If using an environment that doesn't automatically reap zombie processes, it is
# advised to add an init process such as tini via `apt-get install`
# above and adding an entrypoint. See https://github.com/krallin/tini for details
# ENTRYPOINT ["/tini", "--"]

CMD ["/app/bin/server"]

I want a way I can run the server using mix phx.server . Currently what i have done is this which does not work since there is the error saying

mix not found

I wrote this run.sh file and made it executable :


#!/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..."

#Analysis style code
# Prepare Credo if the project has Credo start code analyze
if mix help credo >/dev/null 2>&1
then
  echo "nFound Credo: analyzing..."
  mix credo || true
else
  echo "nNo Credo config: Skipping code analyze..."
fi

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

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

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

And then attached it to the docker-compose.yml


version: "3.2"
services:
  db:
    image: postgres:16.0-alpine
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_EXTENSIONS: citext ,uuid-ossp
    ports:
      - 5432:5432

  web:
    build: .
    volumes:
      - type: bind
        source: .
        target: /app
    ports:
      - "4000:4000"
    environment:
      # Modify your config files (dev.exs and test.exs) so that the password and hostname can be overridden
      # when environment variables are set:
      # password: System.get_env("DB_PASS", "postgres"),
      # hostname: System.get_env("DB_HOST", "localhost"),
      - DB_PASS=
      - DB_HOST=db
    depends_on:
      - db
    command:
      - ./run.sh

Kindly point out where you think i am going wrong so i immediately change it .

Or Provide an alternative way of Dockerizing this application
Thank you.

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Danh mục

Deploying a Phoenix Application with a Postgres database