超丁寧なrails6 + MySQL on Dockerの環境構築

$ git clone https://github.com/azul915/rails6_docker_template.git

# e.g) /bin/bash /path/to/init.sh -p portfolio -r password
$ /bin/bash init.sh -p {project_name} -r {root_password}

# 実行例
CONTAINER ID        IMAGE                        COMMAND                  CREATED             STATUS                       PORTS                                NAMES
91f279ffce2c        rails6_docker_template_web   "irb"                    2 minutes ago       Up 2 minutes                 0.0.0.0:3000->3000/tcp               rails_web
e90ff7416e08        rails6_docker_template_db    "docker-entrypoint.s…"   2 minutes ago       Up 2 minutes                 0.0.0.0:3306->3306/tcp, 33060/tcp    rails_mysql

root@2cd4872e0928:/usr/src# ruby -v

=> ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]

root@2cd4872e0928:/usr/src# sqlite3 --version

=> bash: sqlite3: command not found

root@2cd4872e0928:/usr/src# gem install rails

=> Successfully installed rails-6.0.2.1
   1 gem installed

# Dockerfile
（抜粋）
RUN gem install rails --version="~>6.0.0"

root@a19247e0a147:/usr/src# rails --version

=> Rails 6.0.2.1

docker-compose exec web rails new {project_name} --database=mysql

docker cp rails_web:/usr/src/{project_name} ./

docker-compose down -v

   web:
      build:
         context: .
         dockerfile: ./docker/web.dockerfile
      container_name: rails_web
      volumes:
         - ./portfolio/:/usr/src/portfolio/

$ docker-compose up -d
Creating network "rails6_docker_template_default" with the default driver
Creating rails_mysql ... done
Creating rails_web   ... done

  # before(rails newによる生成直後)
  password:
  host: localhost

  # after
  password: root
  host: db

docker exec -it rails_web /bin/bash

docker-compose exec web /bin/bash

root@2cd4872e0928:/usr/src/{project_name}# rails db:create

=> /usr/local/bundle/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
   /usr/local/bundle/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
   Created database '{project_name}_development'
   Created database '{project_name}_test'

root@2732e9b3ac52:/usr/src/{project_name}# bundle install

=> The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/............
Using rake 13.0.1
(割愛)
Fetching webpacker 4.3.0
Installing webpacker 4.3.0
Bundle complete! 17 Gemfile dependencies, 74 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.

root@2cd4872e0928:/usr/src# exit

docker exec -it rails_mysql /bin/bash

docker-compose exec db /bin/bash

root@58a6d02a3467:/# mysql -u root -p

=> Enter password:
   とパスワードを求められるので`-u`で指定したrootユーザーのパスワードを入力する

=>  Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 15
    Server version: 8.0.19 MySQL Community Server - GPL
    
    Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
    
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
    
    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
    
    mysql>

mysql>show databases;

=> # rails new の{project_name}を portfolio にしたので
   # portfolio_development と portfolio_test ができている
+-----------------------+
| Database              |
+-----------------------+
| information_schema    |
| mysql                 |
| performance_schema    |
| portfolio_development |
| portfolio_test        |
| sys                   |
+-----------------------+
6 rows in set (0.01 sec)

mysql>exit;

root@58a6d02a3467:/# exit

$ docker exec -it rails_web /bin/bash

# Webコンテナにいる状態で
root@a19247e0a147:/usr/src# cd {project_name}

ex)
root@a19247e0a147:/usr/src# cd portfolio

root@a19247e0a147:/usr/src/{project_name} # rails server（rails sでもよい）

=> Booting Puma
=> Rails 6.0.2.1 application starting in development 
=> Run `rails server --help` for more startup options
/usr/local/bundle/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/usr/local/bundle/gems/actionpack-6.0.2.1/lib/action_dispatch/middleware/static.rb:110: warning: The called method `initialize' is defined here
Puma starting in single mode...
* Version 4.3.1 (ruby 2.7.0-p0), codename: Mysterious Traveller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop