ソフトウェア/docker/Railsを動かす のバックアップ(No.2)

更新

公開メモ

参考にしたページ †

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

library/ruby イメージ †

サイズは 55.5MB だった。

とりあえず雰囲気を確かめる。

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#
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