Snippets to Dockerize Rails App

snippets-docker-rails.txt

mkdir nameOfProject
cd nameOfProject

docker run --rm --user "$(id -u):$(id -g)" -v $(pwd):/usr/src -w /usr/src -ti ruby:latest bash
gem install rails
rails new . --database=postgresql --skip-bundle

--------------------- Dockerfile ----------------------

FROM ruby:latest

# add nodejs and yarn dependencies for the frontend
RUN curl -sL https://deb.nodesource.com/setup_6.x | bash - && \
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
 
# Instala nossas dependencias
RUN apt-get update && apt-get install -qq -y --no-install-recommends \
nodejs yarn build-essential libpq-dev imagemagick git-all nano
 
 
# Seta nosso path
ENV INSTALL_PATH /myapp
 
# Cria nosso diretório
RUN mkdir -p $INSTALL_PATH
 
# Seta o nosso path como o diretório principal
WORKDIR $INSTALL_PATH
 
# Copia o nosso Gemfile para dentro do container
COPY Gemfile ./
 
# Seta o path para as Gems
ENV BUNDLE_PATH /gems
 
# Copia nosso código para dentro do container
COPY . .

----------------- Compose ----------------------

version: "3"
 
services:
  postgres:
    image: "postgres:alpine"
    volumes:
      - postgres:/var/lib/postgresql/data
 
  app:
    depends_on:
      - "postgres"
    build: .
    command: bash start.sh
    ports:
      - "3000:3000"
    volumes:
      - .:/myapp
      - gems:/gems
 
 
volumes:
  postgres:
  gems:
  
-------------------- start.sh ---------------------------
# Instala as Gems
bundle check || bundle install
 
# Roda nosso servidor
bundle exec puma -C config/puma.rb

------------------ database.yml -------------------------

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  host: postgres
  user: postgres
 
 
development:
  <<: *default
  database: myappdb_development
 
 
test:
  <<: *default
  database: myappdb_test
 
 
production:
  <<: *default
  database: myappdb_production
  username: myappdb
  password: <%= ENV['EXCHANGE_DATABASE_PASSWORD'] %>
  
  ---------------- run migration ----------------
  
  docker-compose run --rm app bundle exec rails db:create db:migrate
  
  
  .