我正在尝试使用 Rubber 将我的第一个应用程序部署到亚马逊 ec2。我已经尝试了好几次，每次都会出现 Mongo::Connection Failure 的过程错误。我已经尝试了来自多个层的几种不同的实例类型，但仍然遇到相同的错误。只是不知道如何进行。
这是错误日志：
** [out :: production.foo.com] /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongo-1.3.1/lib/mongo/connection.rb:518:in `connect'
** [out :: production.foo.com] :
** [out :: production.foo.com] Failed to connect to a master node at production.foo.com:27017
** [out :: production.foo.com] (
** [out :: production.foo.com] Mongo::ConnectionFailure
** [out :: production.foo.com] )
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongo-1.3.1/lib/mongo/connection.rb:656:in `setup'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongo-1.3.1/lib/mongo/connection.rb:101:in `initialize'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongo-1.3.1/lib/mongo/connection.rb:152:in `new'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongo-1.3.1/lib/mongo/connection.rb:152:in `from_uri'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config/database.rb:89:in `master'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config/database.rb:22:in `configure'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config.rb:273:in `configure_databases'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config.rb:94:in `from_hash'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config.rb:109:in `block in load!'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config.rb:108:in `tap'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/config.rb:108:in `load!'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid.rb:147:in `load!'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/mongoid-2.4.5/lib/mongoid/railtie.rb:84:in `block in <class:Railtie>'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:30:in `instance_exec'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:30:in `run'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:55:in `block in run_initializers'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:54:in `each'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:54:in `run_initializers'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/application.rb:96:in `initialize!'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
** [out :: production.foo.com] from /usr/local/graylog2-web-interface-0.9.6p1/config/environment.rb:6:in `<top (required)>'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `block in require'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `block in load_dependency'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:640:in `new_constants_in'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `load_dependency'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/application.rb:83:in `require_environment!'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands/runner.rb:40:in `<top (required)>'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:63:in `require'
** [out :: production.foo.com] from /usr/local/rubies/1.9.3-p392/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:63:in `<top (required)>'
** [out :: production.foo.com] from ./script/rails:6:in `require'
** [out :: production.foo.com] from ./script/rails:6:in `<main>'
command finished in 66584ms
failed: "/bin/bash -l -c 'sudo -p '\\''sudo password: '\\'' bash -l /tmp/bootstrap_graylog_web'" on production.foo.com