Q&A
本日dockerの教科書を買って、分からない所は読み飛ばして読んだのですが、エラーを解決する事が出来ないので、再度質問させてください。
###開発環境
mac os: sierra 10.12.4
IDE: Rubymine （お試し）
linux
1$ docker version 2Client: 3 Version: 17.03.1-ce 4 API version: 1.27 5 Go version: go1.7.5 6 Git commit: c6d412e 7 Built: Tue Mar 28 00:40:02 2017 8 OS/Arch: darwin/amd64 9 10Server: 11 Version: 17.03.1-ce 12 API version: 1.27 (minimum version 1.12) 13 Go version: go1.7.5 14 Git commit: c6d412e 15 Built: Fri Mar 24 00:00:50 2017 16 OS/Arch: linux/amd64 17 Experimental: true
###実行手順
User/***/workspaceディレクトリ下で、Quick start:compose and rails(リンク内容)の指示に従って、Yay! you r on rails.を表示させる。
linux
1**Dockerfile** 2FROM ruby:2.3.3 3RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs 4RUN mkdir /myapp 5WORKDIR /myapp 6ADD Gemfile /myapp/Gemfile 7ADD Gemfile.lock /myapp/Gemfile.lock 8RUN bundle install 9ADD . /myapp 10 11**Gemfile** 12source 'https://rubygems.org' 13gem 'rails', '5.0.0.1' 14 15**docker-compose.yml** 16version: '2' 17services: 18 db: 19 image: postgres 20 web: 21 build: . 22 command: bundle exec rails s -p 3000 -b '0.0.0.0' 23 volumes: 24 - .:/myapp 25 ports: 26 - "3000:3000" 27 depends_on: 28 - db 29 30**config/database.yml** 31development: &default 32 adapter: postgresql 33 encoding: unicode 34 database: myapp_development 35 pool: 5 36 username: postgres 37 password: 38 host: db 39 40test: 41 <<: *default 42 database: myapp_test
###エラー
ターミナル等何もいじらずに
linux
1workspace ****$ rails g controller StaticPages home help 2workspace ****$ rails test 3/Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:671:in `initialize': could not translate host name "db" to address: nodename nor servname provided, or not known (PG::ConnectionBad) 4 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:671:in `new' 5 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:671:in `connect' 6 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:217:in `initialize' 7 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:37:in `new' 8 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:37:in `postgresql_connection' 9 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:721:in `new_connection' 10 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:765:in `checkout_new_connection' 11 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:744:in `try_to_checkout_new_connection' 12 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:705:in `acquire_connection' 13 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:501:in `checkout' 14 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:364:in `connection' 15 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:875:in `retrieve_connection' 16 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_handling.rb:128:in `retrieve_connection' 17 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/connection_handling.rb:91:in `connection' 18 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1041:in `needs_migration?' 19 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:576:in `load_schema_if_pending!' 20 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:591:in `block in maintain_test_schema!' 21 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:822:in `suppress_messages' 22 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:596:in `method_missing' 23 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:591:in `maintain_test_schema!' 24 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_help.rb:15:in `<top (required)>' 25 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require' 26 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require' 27 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency' 28 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require' 29 from /Users/****/workspace/test/test_helper.rb:3:in `<top (required)>' 30 from /Users/****/workspace/test/controllers/static_pages_controller_test.rb:1:in `require' 31 from /Users/****/workspace/test/controllers/static_pages_controller_test.rb:1:in `<top (required)>' 32 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_unit/test_requirer.rb:11:in `require' 33 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_unit/test_requirer.rb:11:in `block in require_files' 34 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_unit/test_requirer.rb:10:in `each' 35 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_unit/test_requirer.rb:10:in `require_files' 36 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/test_unit/minitest_plugin.rb:76:in `plugin_rails_init' 37 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:80:in `block in init_plugins' 38 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:78:in `each' 39 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:78:in `init_plugins' 40 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:129:in `run' 41 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands/test.rb:9:in `<top (required)>' 42 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:138:in `require' 43 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:138:in `require_command!' 44 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:95:in `test' 45 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!' 46 from /Users/****/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>' 47 from bin/rails:4:in `require' 48 from bin/rails:4:in `<main>' 49 50
###エラー時のコンテナの状態
linux
1workspace ****$ docker-compose ps 2 Name Command State Ports 3--------------------------------------------------------------------------------- 4workspace_db_1 docker-entrypoint.sh postgres Up 5432/tcp 5workspace_web_1 bundle exec rails s -p 300 ... Up 0.0.0.0:3000->3000/tcp
###やった事や考えた事等
エラーをググった所、postgresqlのパスが正しいですか？という回答を見つけたのですが、/var/lib/にdockerディレクトリ（イメージとコンテナ）が見つかりませんでした。また、ローカル(/usr/local/Cellar/postgresql/)にrubyとpostgresqlをインストールしているため、イメージをhubからプルする場合と違って、別途パスの指定が必要なのか？
本を読んだりググったりと、思いつく事を片っ端からやってみたのですが解決出来ないので、お力添えいただけますでしょうか。
回答1件
0
ベストアンサー
User/***/workspaceディレクトリ下で、Quick start:compose and rails(リンク内容)の指示に従って、Yay! you r on rails.を表示させる。
とありますが、「Yay! you r on rails.」が正常に表示されることを確認してから、「エラー」の操作を行ったということでよろしいでしょうか？
config/database.ymlはコンテナ内で実行するための設定になっています。ホスト側で実行するとdbを見つけられないため、データベースの接続エラーになります。
以下のようにコンテナ内で実行する必要があると思います。
sh
1$ docker-compose run web rails g controller StaticPages home help 2Expected string default value for '--helper'; got true (boolean) 3Expected string default value for '--assets'; got true (boolean) 4 create app/controllers/static_pages_controller.rb 5 route get 'static_pages/help' 6 route get 'static_pages/home' 7 invoke erb 8 create app/views/static_pages 9 create app/views/static_pages/home.html.erb 10 create app/views/static_pages/help.html.erb 11 invoke test_unit 12 create test/controllers/static_pages_controller_test.rb 13 invoke helper 14 create app/helpers/static_pages_helper.rb 15 invoke test_unit 16 invoke assets 17 invoke coffee 18 create app/assets/javascripts/static_pages.coffee 19 invoke scss 20 create app/assets/stylesheets/static_pages.scss 21 22$ docker-compose run web rails test 23/myapp/db/schema.rb doesn't exist yet. Run `rails db:migrate` to create it, then try again. If you do not intend to use a database, you should instead alter /myapp/config/application.rb to limit the frameworks that will be loaded. 24Run options: --seed 11517 25 26# Running: 27 28.. 29 30Finished in 0.980967s, 2.0388 runs/s, 2.0388 assertions/s. 31 322 runs, 2 assertions, 0 failures, 0 errors, 0 skips 33
リンク先に書いてある通りにやって10分でできました。dockerは便利ですね。
【追記】
以下のように--rmをつけないとゴミコンテンが増えてしまいます。
sh
1$ docker-compose run --rm web rails g controller StaticPages home help 2$ docker-compose run --rm web rails test
sh
1$ docker-compose ps 2 Name Command State Ports 3----------------------------------------------------------------------------- 4rails_db_1 docker-entrypoint.sh postgres Up 5432/tcp 5rails_web_1 bundle exec rails s -p 300 ... Up 0.0.0.0:3000->3000/tcp 6 7$ docker ps -a 8CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 952933a58373c rails_web "rails test" 13 minutes ago Exited (0) 13 minutes ago rails_web_run_4 102b8ce1178dc0 rails_web "rails g controlle..." 14 minutes ago Exited (0) 14 minutes ago rails_web_run_3 115c03a4144fe9 rails_web "rake db:create" 16 minutes ago Exited (0) 16 minutes ago rails_web_run_2 12718ffb33ba83 rails_web "bundle exec rails..." 16 minutes ago Up 7 minutes 0.0.0.0:3000->3000/tcp rails_web_1 136103f114c226 462714f32758 "rails new . --for..." 20 minutes ago Exited (0) 20 minutes ago rails_web_run_1 14f902caef094a postgres "docker-entrypoint..." 22 minutes ago Up 7 minutes 5432/tcp rails_db_1
投稿2017/04/02 00:23
編集2017/04/02 00:35
総合スコア1800
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