我正在使用 Ubuntu 12.04 LTS（32 位，服务器）、puppet 2.7.17、ruby 1.8.7.352 rubygems 1.8.15 和 Apache 2.2.22。
当我尝试运行命令来迁移数据库时，
<server>:/usr/share/puppet-dashboard# rake RAILS_ENV=production db:migrate
我收到以下错误：
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from /usr/share/puppet-dashboard/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:21.
NOTE: Gem::SourceIndex#initialize is deprecated with no replacement. It will be removed on or after 2011-11-01.
Gem::SourceIndex#initialize called from /usr/share/puppet-dashboard/config/../vendor/rails/railties/lib/rails/vendor_gem_source_index.rb:100.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /usr/lib/ruby/vendor_ruby/1.8/rubygems/source_index.rb:91.
rake aborted!
no such file to load -- rdoc/task
(See full trace by running task with --trace)
当我第一次尝试启动 puppet-dashboard 服务时，它抱怨说找不到 rake ~> 1.1.0，所以我安装了它。
现在我收到以下错误：
Missing these required gems:
rack >= 0
然而...
# gem list
*** LOCAL GEMS ***
hiera (0.3.0)
rack (1.4.1, 1.1.0)
rack-test (0.6.1)
机架安装清晰。阅读后这个问题我甚至删除了 rack 1.4.1，只留下 1.1.0，但仍然出现同样的错误。
答案1
puppet-dashboard上说不要使用10.04 LTS中的rubygems版本，但是没说12.04 LTS中的打包版本也不行。
根据邮件列表的一个建议，我运行了 puppet-dashboard 手册中列出的脚本，并将我的 gem 安装降级到 1.3.7。
我还安装了 rdoc gem。
在这两个更改之间，它解决了该问题。
答案2
在全新安装的 Ubuntu 12.04 Server AMD64 上，我运行了以下两个命令来使其正常db:migrate工作：
sudo gem install rack --version=1.1.0
sudo gem install rack --version=1.1.2
除了这个更改之外，我完全按照安装文档操作，并且成功了。我不知道这两项操作是否都需要，但第一项操作本身只是稍微改变了错误消息。:-)
答案3
您可能还对 Ruby 版本管理器感兴趣。此工具支持同一台机器上的多个 ruby 环境，且不会发生 gem 冲突。