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Docker でRails6とPostgreSQLの環境構築

Last updated at Posted at 2020-10-18

Dockerで Rails6 + PostgreSQLで環境構築

自分の備忘録も兼ねてDockerでRails6 + PostgreSQLで環境構築のやり方を記事にして残しておきます。
今回はアプリ名をshopping_appとして作成していきます。

作成する環境の各バージョン

  • Ruby 2.7.2
  • Rails 6.0.3
  • PostgreSQL 13.0

ディレクトリ構造

 .
 ├── Dockerfile
 ├── docker-compose.yml
 └── shopping_app
     ├── Gemfile
     └── Gemfile.lock

Dockerfileの作成

まずはDockerfileの作成をします。

FROM ruby:2.7.2
ENV LANG C.UTF-8


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

RUN apt-get update -qq && \
    apt-get install -y build-essential \
            libpq-dev \
            nodejs \
            postgresql-client yarn

RUN mkdir /app
RUN mkdir /app/shopping_app

ENV APP_ROOT /app/shopping_app
WORKDIR $APP_ROOT

ADD ./shopping_app/Gemfile $APP_ROOT/Gemfile
ADD ./shopping_app/Gemfile.lock $APP_ROOT/Gemfile.lock

RUN bundle install

ADD . $APP_ROOT

docker-compose.ymlの作成

docker-compose.ymlを作成します。今回はportを1501に設定しています。

version: '3'
services:
  postgres:
    image: postgres
    ports:
      - "3306:3306"
    volumes:
      - ./tmp/db:/var/lib/postgresql/data #MacOSの場合
    environment:
      POSTGRES_USER: 'admin'
      POSTGRES_PASSWORD: 'admin-pass'
    restart: always
  app:
    build: .
    image: rails
    container_name: 'app'
    command: bundle exec rails s -p 1501 -b '0.0.0.0'
    ports:
      - "1501:1501"
    environment:
      VIRTUAL_PORT: 80
    volumes:
      - ./shopping_app:/app/shopping_app
    depends_on:
      - postgres
    restart: always

volumes:
  app_postgre:
    external: true

Gemfileの作成

source 'https://rubygems.org'
gem 'rails', '6.0.3'

Gemfile.lockは空のままでいいです。

コンテナをBuildしてappを作成

$ docker-compose run app rails new . --force --database=postgresql --skip-bundle

webpackerのinstall

docker-compose run app rails webpacker:install

Databaseの作成と設定

作成されたappのdatabase.ymlを設定します。

default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  # https://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  # 以下を記述
  user: admin
  password: admin-pass
  host: postgres

imageをbuild

docker-compose build

Databaseの作成

docker-compose run app rails db:create

以上で構築完了です。
以下のコマンドでアプリを起動して

docker-compose up

http://localhost:1501/
にアクセスすれば以下の画面に表示されます。

スクリーンショット 2020-10-18 20.16.20.png

以上です。

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