Example docker config for rails develompent

Dockerfile

FROM ruby:2.4

## In case of postgresql for heroku:
# RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main" >> /etc/apt/sources.list.d/postgeresql.list \
#  && wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
#  && apt-get update                                     \
#  && apt-get update                                     \
#  && apt-get install -y --no-install-recommends         \
#    postgresql-client-9.6 pv ack-grep ccze unp htop vim \
#  && rm -rf /var/lib/apt/lists/*                        \
#  && apt-get purge -y --auto-remove

## In case of mysql for amazon RDS
RUN apt-get update                                                     \
  && apt-get update                                                    \
  && apt-get install -y --no-install-recommends mysql-client nodejs pv \
  && rm -rf /var/lib/apt/lists/*                                       \
  && apt-get purge -y --auto-remove

ENV BUNDLER_VERSION 1.15.3

RUN gem install bundler --version "$BUNDLER_VERSION"

WORKDIR /usr/src/app

EXPOSE 3000

CMD ["rails", "server", "-b", "0.0.0.0"]

gistfile1.txt

version: '2'

services:
  app: &app_base
    build: .
    working_dir: /usr/src/app
    volumes:
      - .:/usr/src/app
      # to be able to forward ssh-agent to github throught capistrano (bundle on server)
      - "~/.ssh/id_rsa:/root/.ssh/id_rsa"
      - $SSH_AUTH_SOCK:$SSH_AUTH_SOCK
    environment: &app_environment
      TZ: Europe/Madrid
      # to keep bundle effect between container restarts (withou rebuild):
      BUNDLE_PATH: /usr/src/app/.bundle       
      BUNDLE_APP_CONFIG: /usr/src/app/.bundle
      DATABASE_HOST: db
      MEMCACHED_HOST: cache
      SSH_AUTH_SOCK: # this left empty copies from outside env
    command: 'bin/start'
    ports:
      - "3000:3000"
    depends_on:
      - db
      - cache
      - queue
  queue:
    # import app's config to run delayed_job workers
    <<: *app_base 
    ports: [] # dont open 300 also, it would collide with app's
    depends_on:
      - db
      - cache
    environment:
      <<: *app_environment
      QUEUE: default
    command: 'bin/start_queue'
  cache:
    image: memcached
    ports:
      - "11211"
  db:
    image: mysql:5.5
    environment:
      MYSQL_DATABASE: my_project_development
      MYSQL_ROOT_PASSWORD: root
    volumes:
      # max_allowed_packet=32M' or any other custom config for mysql
      - './config/mysql:/etc/mysql/conf.d/'
    ports:
      # expose the port on localhost to use db GUI
      - "3306:3306"
## In case of postgres
#  db:
#    image: postgres
#    ports:
#      - "5432:5432"
#    environment:
#      POSTGRES_DB: my_project_development
#      POSTGRES_USER: root
#      POSTGRES_PASSWORD: root

start

#!/usr/bin/env bash
# bin/start

echo "Removing old server pid's if any..."
rm -f tmp/pids/server.pid

echo "Checking bundle dependencies..."
bundle check || bundle install

echo "Booting up..."
bundle exec rails s -p 3000 -b 0.0.0.0 -e development

start_queue

#!/usr/bin/env bash
# bin/start_queue 

echo "Removing old server pid's if any..."
rm -f tmp/pids/delayed*.pid

echo "Checking bundle dependencies..."
bundle check || bundle install

echo "Booting up..."
bundle exec bin/delayed_job run -n 2