Rails和亞馬遜RDS：「生產數據庫沒有配置」

Question

我是全新的AWS，並嘗試在Beanstalk上啓動我的Rails應用程序。我遵循recent tutorial，但我堅持讓我的應用程序連接到RDS。乘客屏幕出現了一個錯誤：

production database is not configured (ActiveRecord::AdapterNotSpecified) 

我database.yml樣子：

production: 
  adapter: mysql2 
  encoding: utf8 
  database: <%= ENV['RDS_DB_NAME'] %> 
  username: <%= ENV['RDS_USERNAME'] %> 
  password: <%= ENV['RDS_PASSWORD'] %> 
  host: <%= ENV['RDS_HOSTNAME'] %> 
  port: <%= ENV['RDS_PORT'] %> 

我確實有配置和運行的RDS實例。我也參加了EC2實例，並驗證了我可以通過RDS_USERNAME，RDS_HOSTNAME等成功連接到RDS。

想到也許我需要在MySQL中手動創建我的數據庫我使用MySQL客戶端來完成那，但我仍然得到相同的錯誤。

所以再次我手動檢查了我的項目，跑bundle exec rake db:migrate --trace獲得其中它的失敗的更完整的畫面EC2實例：

** Invoke db:migrate (first_time) 
** Invoke environment (first_time) 
** Execute environment 
** Invoke db:load_config (first_time) 
** Execute db:load_config 
rake aborted! 
production database is not configured 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/connection_adapters/abstract/connection_specification.rb:39:in `resolve_string_connection' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/connection_adapters/abstract/connection_specification.rb:25:in `spec' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/connection_adapters/abstract/connection_specification.rb:129:in `establish_connection' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/railtie.rb:82:in `block (2 levels) in <class:Railtie>' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:42:in `each' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/base.rb:721:in `<top (required)>' 
/usr/share/ruby/1.9/gems/1.9.1/gems/activerecord-3.2.8/lib/active_record/railties/databases.rake:6:in `block (2 levels) in <top (required)>' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:227:in `call' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:227:in `block in execute' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:222:in `each' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:222:in `execute' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:166:in `block in invoke_with_call_chain' 
/usr/share/ruby/1.9/monitor.rb:211:in `mon_synchronize' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:159:in `invoke_with_call_chain' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:187:in `block in invoke_prerequisites' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:185:in `each' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:185:in `invoke_prerequisites' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:165:in `block in invoke_with_call_chain' 
/usr/share/ruby/1.9/monitor.rb:211:in `mon_synchronize' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:159:in `invoke_with_call_chain' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/task.rb:152:in `invoke' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:141:in `invoke_task' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:99:in `block (2 levels) in top_level' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:99:in `each' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:99:in `block in top_level' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:108:in `run_with_threads' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:93:in `top_level' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:71:in `block in run' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:158:in `standard_exception_handling' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/lib/rake/application.rb:68:in `run' 
/usr/share/ruby/1.9/gems/1.9.1/gems/rake-10.0.2/bin/rake:37:in `<top (required)>' 
/usr/bin/rake:23:in `load' 
/usr/bin/rake:23:in `<main>' 
Tasks: TOP => db:migrate => db:load_config 

Answer 1

WAS用戶錯誤：複製/粘貼從鏈接的文章導致「空格」顯然是一些unicode cruft而不是ASCII 32。

獲得的經驗教訓：使用od -c your_file.yml來診斷潛在的有趣字符。