ソフトウェア/docker/Railsを動かす のバックアップソース(No.4)

更新

[[公開メモ]]

* 参考にしたページ [#k6629f77]

https://qiita.com/okamos/items/8e9b258e3d610bdc2ed9

Qiita - Ruby on Rails 5.2の新機能(Active Storage, Content Security Policyなど)~
https://qiita.com/ryohashimoto/items/75f48fa5a3846c58f735

* library/ruby イメージ の雰囲気を確かめる [#n6f054ca]

サイズは 55.5MB だった。

 LANG:console
 $ docker run --rm -it ruby:alpine         # 何も指定しないと irb が立ち上がる
  irb(main):001:0>^D
 $ docker run --rm -it ruby:alpine bash    # bash は入っていない
  docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"bash\": executable file not found in $PATH": unknown.
 $ docker run --rm -it ruby:alpine sh      # sh は入ってる
 /# ls -l bin/sh                           # 正体は busybox
  lrwxrwxrwx    1 root     root            12 Jan  9 19:37 bin/sh -> /bin/busybox
 /# ruby --version
  ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-musl]
 /# gem --version
  2.7.6
 /# bundle --version
  Bundler version 1.16.1
 /# gem install rails                      # 始めは gcc 等が入っていないのでコケる
  ...
  Fetching: nokogiri-1.8.2.gem (100%)
  Building native extensions. This could take a while...
  ERROR:  Error installing rails:
          ERROR: Failed to build gem native extension.
  ...
 /# apk add -U --no-cache bash git alpine-sdk nodejs tzdata  # いろいろ入れる
 /# gem install rails                      # これで入った
  ...
  Successfully installed rails-5.2.0
  30 gems installed
 /# rails new myapp
  ...
  Installing sqlite3 1.3.13 with native extensions
  Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
  ...
 /# apk add sqlite-dev
 /# rails new myapp                        # うまく行った
 /# cd myapp
 /myapp# rails s &                         # サーバーを起動
  => Booting Puma
  => Rails 5.2.0 application starting in development
  => Run `rails server -h` for more startup options
  Puma starting in single mode...
  * Version 3.11.4 (ruby 2.5.1-p57), codename: Love Song
  * Min threads: 5, max threads: 5
  * Environment: development
  * Listening on tcp://0.0.0.0:3000
  Use Ctrl-C to stop
 /myapp# wget -O- localhost:3000 | head -4 # 正しく読める
  Connecting to localhost:3000 (127.0.0.1:3000)
  Started GET "/" for 127.0.0.1 at 2018-05-09 20:02:41 +0000
  Processing by Rails::WelcomeController#index as HTML
    Rendering /usr/local/bundle/gems/railties-5.2.0/lib/rails/templates/rails/welcome/index.html.erb
    Rendered /usr/local/bundle/gems/railties-5.2.0/lib/rails/templates/rails/welcome/index.html.erb (3.0ms)
  Completed 200 OK in 6ms (Views: 4.5ms | ActiveRecord: 0.0ms)
  
  <!DOCTYPE html>
  <html>
  <head>
    <title>Ruby on Rails</title>
 /myapp# cat Gemfile                       # 標準の Gemfile
  source 'https://rubygems.org'
  git_source(:github) { |repo| "https://github.com/#{repo}.git" }
  
  ruby '2.5.1'
  
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '~> 5.2.0'
  # Use sqlite3 as the database for Active Record
  gem 'sqlite3'
  # Use Puma as the app server
  gem 'puma', '~> 3.11'
  # Use SCSS for stylesheets
  gem 'sass-rails', '~> 5.0'
  # Use Uglifier as compressor for JavaScript assets
  gem 'uglifier', '>= 1.3.0'
  # See https://github.com/rails/execjs#readme for more supported runtimes
  # gem 'mini_racer', platforms: :ruby
  
  # Use CoffeeScript for .coffee assets and views
  gem 'coffee-rails', '~> 4.2'
  # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
  gem 'turbolinks', '~> 5'
  # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
  gem 'jbuilder', '~> 2.5'
  # Use Redis adapter to run Action Cable in production
  # gem 'redis', '~> 4.0'
  # Use ActiveModel has_secure_password
  # gem 'bcrypt', '~> 3.1.7'
  
  # Use ActiveStorage variant
  # gem 'mini_magick', '~> 4.8'
  
  # Use Capistrano for deployment
  # gem 'capistrano-rails', group: :development
  
  # Reduces boot times through caching; required in config/boot.rb
  gem 'bootsnap', '>= 1.1.0', require: false
  
  group :development, :test do
    # Call 'byebug' anywhere in the code to stop execution and get a debugger console
    gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  end
  
  group :development do
    # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
    gem 'web-console', '>= 3.3.0'
    gem 'listen', '>= 3.0.5', '< 3.2'
    # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
    gem 'spring'
    gem 'spring-watcher-listen', '~> 2.0.0'
  end
  
  group :test do
    # Adds support for Capybara system testing and selenium driver
    gem 'capybara', '>= 2.15', '< 4.0'
    gem 'selenium-webdriver'
    # Easy installation and use of chromedriver to run system tests with Chrome
    gem 'chromedriver-helper'
  end
  
  # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
  gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

* 方針 [#me5e176b]

rails サーバー と postgresql サーバーとを別々に建てて接続する

postgres と mysql のイメージサイズは10倍くらい違う。~
どちらでもいいなら postgres を使いたくなる感じ。

 postgres                 alpine              24a77bfbb9ee        13 hours ago        39.5MB
 mysql                    latest              a8a59477268d        5 days ago          445MB

* postgres イメージの使い方 [#u42d179e]

以下まだ考え中、とりあえずメモとして保存。後で編集する。

postgres 側の起動:
 LANG:console
 $ docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres:alpine

 LANG:console
This image includes EXPOSE 5432 (the postgres port), so standard container linking will make it automatically available to the linked containers. The default postgres user and database are created in the entrypoint with initdb.

    The postgres database is a default database meant for use by users, utilities and third party applications.

    postgresql.org/docs

connect to it from an application

 LANG:console
 $ docker run --name some-app --link some-postgres:postgres -d application-that-uses-postgres

* development [#ze449dce]

まだ考え中

 $ docker run -it -v /path_to_app_in_host:/rails_proj -p 13000:3000 myimage/ruby_with_docker /bin/sh
 /# cd /rails_proj
 /# bundle install
 /# rails db:create
 /# rails db:migrate
 /# rails s

* Dockerfile の作りかけ [#nf20b46f]

 FROM ruby:alpine
 
 RUN \
     # いろいろ入れる
     apk add -U --no-cache bash git alpine-sdk nodejs tzdata  && \
     # bundler 入れる
     gem install bundler && \
     #
     cd 

Gemfile
 LANG:ruby
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby '2.5.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
 gem 'puma', '~> 3.11'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'
 # See https://github.com/rails/execjs#readme for more supported runtimes
 gem 'mini_racer', platforms: :ruby
 
 # Use CoffeeScript for .coffee assets and views
 gem 'coffee-rails', '~> 4.2'
 # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
 ## gem 'turbolinks', '~> 5'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
 # gem 'redis', '~> 4.0'
 # Use ActiveModel has_secure_password
 gem 'bcrypt', '~> 3.1.7'
 
 # Use ActiveStorage variant
 # gem 'mini_magick', '~> 4.8'
 
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
 # Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', '>= 1.1.0', require: false
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
 end
 
 group :development do
   # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
   gem 'web-console', '>= 3.3.0'
   gem 'listen', '>= 3.0.5', '< 3.2'
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
 end
 
 group :test do
   # Adds support for Capybara system testing and selenium driver
   gem 'capybara', '>= 2.15', '< 4.0'
   gem 'selenium-webdriver'
   # Easy installation and use of chromedriver to run system tests with Chrome
   gem 'chromedriver-helper'
 
   gem 'rspec-rails'
   gem 'rails-controller-testing'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 # gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 # riot support
 gem 'riot_js-rails', github: 'bjarosze/riot_js-rails', ref: 'f6328dbabcdf69400e1cea70485973ae1c926b94'
 gem 'slim-rails'
 
 # frontend libraries
 gem 'jquery-rails'
 gem 'jquery-validation-rails'
 gem 'materialize-sass'
 
 # easy way to check emails sent by rails app
 group :development do
   gem "letter_opener"
   gem "letter_opener_web"
 end

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