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Docker開発環境

Posted at

はじめに

現在開発中のアプリにDockerを導入したのでアウトプットします。

環境

Ruby on Rails '6.0.0'
Ruby '2.6.5'
MySQL '5.6.47'

Dockerfile

開発中アプリのルートディレクトリにDockerfileを作成します。

Dockerfile
FROM ruby:2.6.5

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

RUN mkdir /アプリ名
WORKDIR /アプリ名

ADD ./Gemfile /アプリ名/Gemfile
ADD ./Gemfile.lock /live_search/Gemfile.lock

RUN gem install bundler
RUN bundle install
ADD . /アプリ名

docker-compose.yml

docker-compose.yml
version: '3'
services:
  db:
    image: mysql:5.6.47
    environment:
      MYSQL_ROOT_PASSWORD: 'password'
    ports:
      - "4306:3306"
    volumes:
      - ./db/mysql-data:/var/lib/mysql

  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/アプリ名
    ports:
      - "3000:3000"
    depends_on:
      - db

entrypoint.sh

entrypoint.sh
set -e

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

exec "$@"

database.yml

database.yml
default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: password
  host: db
  socket: /tmp/mysql.sock

password: password
host: db
を追加

コンテナを作成

ターミナル
% docker-compose build

DB作成、migrationの実行

ターミナル
% docker-compose run web bundle exec rake db:create
% docker-compose run web bundle exec rake db:migrate

コンテナを起動

ターミナル
% docker-compose up 
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