Dockerizar um projeto rails ou criar um novo projeto rails com docker

README.md

Setup of project

1. Create file .env and env.test off file .env.sample.

2. Add values in the variables empties

3. Add value below on file .env

DATABASE_URL=postgres://postgres:postgres@db:5432/projeto_development

4. Add value below on file .env.test

DATABASE_URL=postgres://postgres:postgres@db:5432/projeto_test

5. Create file .env.sidekiq and add values below:

REDIS_URL=redis://redis:6379/0
SIDEKIQ_WORKERS=5
DATABASE_URL=postgres://postgres:postgres@db:5432/projeto_development

6. Execute the command below for build image

docker-compose up -d --no-deps --build app

7. Execute the command below for start project

docker compose up -d

8. Execute the command below for access bash

docker compose run --rm app bash

9. Execute the command below for create database

rails db:create

10. Execute the command below for migration database

rails db:migrate

11. Execute the command below for populate database

rails db:seed

Command extras

Reset stats sidekiq

Sidekiq::Stats.new.reset

For the test rspec, execute the command below

ENV_FILE=.env.test docker compose run --rm app rspec

For execute rubocop

docker compose run --rm app rubocop

For debug with binding.pry

docker attach --detach-keys="ctrl-c" <id_do_container_app>

database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  url: <%= ENV["DATABASE_URL"] %>

development:
  <<: *default

test:
  <<: *default

homolog:
  <<: *default

production:
  <<: *default

docker-compose.yml

version: "2"

services:
  app:
    build:
      context: .
    image: nome_da_imagem
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/app
      - projeto_bundle:/usr/local/bundle
    ports:
      - 3000:3000
    networks:
      - projeto_network
    stdin_open: true
    tty: true
    env_file:
      - ${ENV_FILE:-.env}
    depends_on:
      - db

  db:
    image: postgres:13.2-alpine
    container_name: projeto_db
    volumes:
      - pg_data:/var/lib/postgresql/data
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
    ports:
      - "5432:5432"
    networks:
      - projeto_network

  redis:
    image: redis:6.0.12-alpine
    container_name: projeto_redis
    command: redis-server
    volumes:
      - redis_data:/data
    ports:
      - "6379:6379"
    logging:
      driver: none
    networks:
      - projeto_network

  sidekiq:
    image: nome_da_imagem_do_app
    container_name: projeto_sidekiq
    depends_on:
      - app
      - db
      - redis
    #mem_limit: 512m
    volumes:
      - .:/app
      - alfasystem_bundle:/usr/local/bundle
    command: dotenv -f ".env.sidekiq" bundle exec sidekiq -C config/sidekiq.yml
    networks:
      - projeto_network

  mailcatcher:
    restart: on-failure
    image: dockage/mailcatcher:0.8.2
    ports:
    - "1080:1080"
    - "1025:1025"

volumes:
  pg_data:
  redis_data:
  projeto_bundle:

networks:
  projeto_network:
    name: projeto_network

Dockerfile

FROM ruby:3.1.2

ARG NODE_MAJOR_VERSION=19
RUN curl -sL https://deb.nodesource.com/setup_$NODE_MAJOR_VERSION.x | bash -
RUN apt-get update -qq && \
    apt-get install -y build-essential libvips nodejs libpq-dev postgresql-client && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/* /usr/share/doc /usr/share/man && \
    npm install -g yarn

RUN mkdir /app
WORKDIR /app
ADD . /app
RUN gem install bundler -v 2.3.26 # aqui você pode especificar com o que está no final do Gemfile.lock
RUN bundle install

Para novos projetos com rails 7 usar o comando abaixo:

 docker compose run --no-deps app rails new . -d postgresql -c tailwind -j esbuild

Alterar no docker-compose o command do app para chamar pelo bin/dev

Alterar o Procfile.dev para o rails server ter o -b '0.0.0.0'