刚刚开始进入RoR开发，我正在努力让Webrick服务器启动。我在我的rails项目文件夹中。然后我输入rails server或rails s，看起来服务器将启动，然后它会显示Exiting，下面列出了一堆其他内容。谁知道什么是错的？这是终端吐出来的......
wyep:simple_cms designer1$ rails s
=> Booting WEBrick
=> Rails 3.2.13 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': Access denied for user 'root'@'localhost' (using password: NO) (Mysql2::Error)
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout'
from /Users/designer1/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout' from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection'
from /Users/designer1/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/activerecord-3.2.13/lib/active_record/railtie.rb:88:in `block in <class:Railtie>'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
from /Applications/MAMP/htdocs/simple_cms/config/environment.rb:5:in `<top (required)>'
from /Applications/MAMP/htdocs/simple_cms/config.ru:3:in `require'
from /Applications/MAMP/htdocs/simple_cms/config.ru:3:in `block in <main>'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/builder.rb:51:in `instance_eval'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/builder.rb:51:in `initialize'
from /Applications/MAMP/htdocs/simple_cms/config.ru:in `new'
from /Applications/MAMP/htdocs/simple_cms/config.ru:in `<main>'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/builder.rb:40:in `eval'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/builder.rb:40:in `parse_file'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/server.rb:200:in `app'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands/server.rb:46:in `app'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/server.rb:304:in `wrapped_app'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/rack-1.4.5/lib/rack/server.rb:254:in `start'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands/server.rb:70:in `start'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
from /Users/designer1/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
答案 0 :(得分：1)
错误出现在那里：
Access denied for user 'root'@'localhost' (using password: NO) (Mysql2::Error)
在config/database.yml中，您需要指定有效的host，user和password