Ruby on Rails development with docker-compose, spring and PostgreSQL

docker-compose.yml

version: '2'

volumes:
  postgres-data:
    driver: local

services:
  db:
    image: postgres
    volumes:
      - postgres-data:/var/lib/postgresql/data        
  spring:
    build: .
    volumes:
      - .:/usr/src/app
    command: bundle exec spring server
    pid: host        
  web:
    build: .
    command: bundle exec puma -b 'tcp://0.0.0.0:3000'
    volumes:
      - .:/usr/src/app
    ports:
      - "3000:3000"
    depends_on:
      - db  

Dockerfile

# 1: Use ruby 2.3.3 as base:
FROM ruby:2.3.3

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev 

# 2: We'll set the application path as the working directory
WORKDIR /usr/src/app

# 3: We'll set the working dir as HOME and add the app's binaries path to $PATH:
ENV HOME=/usr/src/app PATH=/usr/src/app/bin:$PATH

# 7: Install the current project gems - they can be safely changed later during
# development via `bundle install` or `bundle update`:
ADD Gemfile* /usr/src/app/
RUN set -ex && bundle install --jobs 2 --retry 3 --clean

checkout the blog post: https://grant-ps.blog/2017/03/15/ruby-on-rails-development-with-docker-compose-spring-and-postgresql/