Start here: https://github.com/ryanwi/rails7-on-docker/generate

Rails 7 on Docker demo application

This app demonstrates Rails 7 with PostgreSQL, import maps, turbo, stimulus and hotwire, all running in Docker.

NOTE: There is also an example Rails 6 application working in Docker with Webpacker

Features

• Rails 7
• Ruby 3.3
• Dockerfile and Docker Compose configuration
• PostgreSQL database
• Redis
• GitHub Actions for
  • tests
  • Rubocop for linting
  • Security checks with Brakeman and bundler-audit
  • Building and testing of a production Docker image
• Dependabot for automated updates

Requirements

Please ensure you are using Docker Compose V2. This project relies on the docker compose command, not the previous docker-compose standalone program.

https://docs.docker.com/compose/#compose-v2-and-the-new-docker-compose-command

Check your docker compose version with:

% docker compose version
Docker Compose version v2.10.2

Initial setup

cp .env.example .env
docker compose build
docker compose run --rm web bin/rails db:setup

Running the Rails app

docker compose up

Running the Rails console

When the app is already running with docker-compose up, attach to the container:

docker compose exec web bin/rails c

When no container running yet, start up a new one:

docker compose run --rm web bin/rails c

Running tests

docker compose run --rm web bin/rspec

Updating gems

docker compose run --rm web bundle update
docker compose up --build

Production build

(adjust tags as needed)

with BuildKit

DOCKER_BUILDKIT=1 docker build --tag rails-on-docker --load .

Test the image can be used and Rails starts up, use a fake key for testing purposes only:

docker run --rm --env SECRET_KEY_BASE=dummy rails-on-docker

With legacy builder (no BuildKit)

docker build --tag rails-on-docker .

Test the image can be used and Rails starts up, use a fake key for testing purposes only:

docker run --rm --env SECRET_KEY_BASE=dummy rails-on-docker

Deployment

This app can be hosted wherever Ruby is supported and PostgreSQL databases can be provisioned.

Render

NOTE: You will need to generate a production secret with bin/rails secret and set it as the SECRET_KEY_BASE environment variable.

Credits/References

Rails with Docker

• Quickstart: Compose and Rails
• Docker Rails Samples
• Docker for Rails Developers Build, Ship, and Run Your Applications Everywhere
• Ruby on Whales: Dockerizing Ruby and Rails development
• Rails generator to produce Dockerfiles and related files
• docker init
• Rails 7.1 Dockerfile Generator Template

Rails 7 with importmaps

• Alpha preview: Modern JavaScript in Rails 7 without Webpack

Rails 7 with hotwire

• Stimulus 3 + Turbo 7 = Hotwire 1.0
• Turbo 7
• Rails 7 will have three great answers to JavaScript in 2021+
• Hotwire Turbo Replacing Rails UJS

Author

Ryan Williams

• https://www.ryanwilliams.dev
• https://twitter.com/ryanwi
• https://hachyderm.io/@ryanwi
• https://github.com/ryanwi