Docker + Rails7 + Webpack な開発環境の構築方法【コピペでOK】

$ touch Dockerfile docker-compose.yml entrypoint.sh Gemfile Gemfile.lock my.cnf

version: "3"
services:
  app:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && ./bin/dev"
    # raisl6の場合： command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/myapp:delegated
    ports:
      - "3000:3000"
    depends_on:
      - db
    tty: true
    stdin_open: true

  db:
    image: mysql:8.0
    environment:
      MYSQL_ROOT_PASSWORD: password
    ports:
      - '3306:3306'
    volumes:
      - ./tmp/db:/var/lib/mysql:delegated
      - ./my.cnf:/etc/mysql/conf.d/my.cnf
    cap_add:
      - SYS_NICE

FROM ruby:3.1.2
ENV TZ Asia/Tokyo

RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
    && apt-get update -qq \
    && apt-get install -y nodejs \
    && npm install -g yarn

WORKDIR /myapp
RUN gem install bundler
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install

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

rm -f /myapp/tmp/pids/server.pid

exec "$@"

source 'https://rubygems.org'
gem 'rails', '~>6.1.4'

[mysqld]
character-set-server=utf8mb4
collation-server=utf8mb4_general_ci
default-authentication-plugin=mysql_native_password

$ docker-compose run --no-deps app rails new . --force --database=mysql --javascript=webpack --skip-test
$ docker-compose build