Summary

백엔드 Rails API & 프런트 엔드 React & Docker 환경을 실현했으므로 절차를 기록해 둡니다.

파일 구성

1. Rails 초기 설정 파일 작성

source 'https://rubygems.org'
gem 'rails', '=>6'

# 空

2. Rails & React 용 Docker 관련 파일 작성

Rails

FROM ruby:2.7.2

# Rails6 からは以下のインストールが必要
# https://yarnpkg.com/lang/en/docs/install/#debian-stable
RUN 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 && \
  apt-get update -qq && apt-get install -y nodejs postgresql-client vim && \
  apt-get install -y yarn && \
  apt-get install -y imagemagick && \
  apt-get install -y libvips-tools && \
  apt-get install -y locales

RUN curl -sL https://deb.nodesource.com/setup_7.x | bash - && \
    apt-get install nodejs

RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

CMD ["rails", "server", "-b", "0.0.0.0"]

#!/bin/bash
set -e

# Remove a potentially pre-existing server.pid for Rails.
rm -f /myapp/tmp/pids/server.pid

# Then exec the container's main process (what's set as CMD in the Dockerfile).
exec "$@"

React

FROM node:14.16.0-alpine3.10
WORKDIR /usr/src/app

3. docker-compose.yml 만들기

version: "3.9"

services:
  db:
    image: postgres
    volumes:
      - postgres-data:/var/lib/postgresql/data
    environment:
      - POSTGRES_PASSWORD=password

  api:
    build:
      context: ./api/
      dockerfile: Dockerfile
    command: /bin/sh -c "rm -f /myapp/tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - ./api:/myapp
      - ./api/vendor/bundle:/myapp/vendor/bundle
    environment:
      TZ: Asia/Tokyo
      RAILS_ENV: development
    ports:
      - 3000:3000
    depends_on:
      - db

  front:
    build:
      context: ./front/
      dockerfile: Dockerfile
    volumes:
      - ./front:/usr/src/app
    command: sh -c "cd frontend && yarn start"
    ports:
      - "8000:3000"

volumes:
  postgres-data:
    driver: local

4. docker 명령 실행

$ docker-compose run api rails new . --force --no-deps --database=postgresql --api
$ docker-compose build
# yarn でインストール、Typescript 対応
$ docker-compose run --rm front sh -c "yarn create react-app frontend --template typescript"

5. database.yml 변경

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password: password
  pool: 5

development:
  <<: *default
  database: myapp_development

test:
  <<: *default
  database: myapp_test

production:
  <<: *default
  database: myapp_production
  username: myapp
  password: <%= ENV['MYAPP_DATABASE_PASSWORD'] %>

6. docker-compose로 시작

$ docker-compose up -d
$ docker-compose run api rails db:create

참고