jw81 / dockerized-rails7

A working, bare-bones example of how to use Docker Compose to dockerize a Rails 7 app with a Postgres DB.

Description

This is a bare-bones example of how to use Docker Compose to Dockerize a Rails 7 app with a Postgres DB. Below is a "script" for how to build a project exactly like this.

(These steps assume that you are using and are familiar with RVM and you're on a silicon chip MacOS.)

Steps to Reproduce

• In terminal, navigate to where you're going to create the app.
• run :: rvm use ruby-3.1.0
• run :: rvm gemset create dockerized-rails-7.0.4.2
• run :: rvm gemset use dockerized-rails-7.0.4.2
• run :: gem install bundler
• run :: gem install rails -v 7.0.4.2
• run :: rails new dockerized-rails7 --database=postgresql
• run :: cd dockerized-rails7
• run :: touch Dockerfile
  • Copy/Paste and Save this into the new Dockerfile

  FROM ruby:3.1.0
  
  RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
  WORKDIR /app
  COPY . /app/
  
  ENV BUNDLE_PATH /gems
  RUN bundle install
  
  ENTRYPOINT ["bin/rails"]
  CMD ["s", "-b", "0.0.0.0"]
  
  EXPOSE 3000
  

• run :: touch docker-compose.yml
  • Copy/Paste and Save this into the new docker-compose.yml file

  services:
    db:
      image: postgres:15.2
      environment:
        - POSTGRES_PASSWORD=password
      ports:
        - "5432:5432"
      volumes:
        - "dbdata:/var/lib/postgresql/data"
  
    web:
      build: .
      ports:
        - "3000:3000"
      depends_on:
        - db
      environment:
        - DATABASE_URL=postgres://postgres:password@db:5432/postgres
      volumes:
        - .:/app
  
  volumes:
    dbdata:
  

• run :: docker compose up
• Give it a bit to build and when the console output shows that everything is ready, navigate to localhost:3000
• You should now see the Rails splash screen in your browser
• hit ctrl + c to stop the Dockerized app
• run :: docker compose down to remove the app containers