ruby-on-rails - "Gem::RemoteFetcher::UnknownHostError"安装 Rails 版本 3.2.15 时

Question

我之前已经在具有数据持久性的实时 ubuntu USB 上成功安装了 rails 3.2.15。

现在我已经习惯了操作系统( Ubuntu 12.04 LTS )，我已经将它安装在笔记本电脑上，并且正在安装我在实时 USB 中使用的东西。

长话短说，我在安装 Rails 时遇到了问题。我使用相同的说明来安装 ruby​​ 和 rails 与 live usb 中的说明相同:http://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/

但是，我在安装 rails 时收到此错误:

ERROR: While executing gem ... (Gem::RemoteFetcher::UnknownHostError) no such name (https://api.rubygems.org/api/v1/dependencies?gems=activemodel)

我已经使用 -V 来查看发生了什么，但是，作为一般的技术菜鸟，我不知道出了什么问题。

这是 -V 给出的:

~$ gem install rails -V 3.2.15 HEAD https://api.rubygems.org/latest_specs.4.8.gz 302 Moved Temporarily HEAD https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz 200 OK GET https://api.rubygems.org/latest_specs.4.8.gz 302 Moved Temporarily GET https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz 200 OK HEAD https://api.rubygems.org/latest_specs.4.8.gz 302 Moved Temporarily HEAD https://s3.amazonaws.com/production.s3.rubygems.org/latest_specs.4.8.gz 304 Not Modified GET https://api.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz 302 Moved Temporarily GET https://bb-m.rubygems.org/quick/Marshal.4.8/rails-4.0.2.gemspec.rz 200 OK HEAD https://api.rubygems.org/api/v1/dependencies 302 Moved Temporarily HEAD https://bundler.rubygems.org/api/v1/dependencies 200 OK HEAD https://api.rubygems.org/api/v1/dependencies 302 Moved Temporarily HEAD https://bundler.rubygems.org/api/v1/dependencies 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=rails 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=rails 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=rails 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=rails 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=railties 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=railties 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=railties 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=railties 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=actionmailer 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=actionmailer 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=actionmailer 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=activerecord 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=activerecord 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=activerecord 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=activerecord 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=actionpack 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=actionpack 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=actionpack 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=actionpack 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=activesupport 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=activesupport 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=activesupport 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=activesupport 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=activemodel 302 Moved Temporarily GET https://bundler.rubygems.org/api/v1/dependencies?gems=activemodel 200 OK ERROR: While executing gem ... (Gem::RemoteFetcher::UnknownHostError) no such name (https://api.rubygems.org/api/v1/dependencies?gems=activemodel)

任何人都可以帮忙吗？

附加信息:

使用:

ruby 2.1.0p0 (2013-12-25 修订版 44422) [i686-linux]

rvm 1.25.15(稳定版)作者:Wayne E. Seguin，Michal Papis [https://rvm.io/]

Answer 1

我遇到了同样的问题:Ubuntu 12.04，ruby 2.1.0 试图安装最新的 rails (4.0.x)。做 gem 安装 rails 我遇到了同样的错误。我做了什么:

更新 ruby​​gem: gem 更新--系统它从 2.2.0 到 2.2.2

找到过时的 gems ( gem outdated ) 并得到了几个过时的:bigdecimal (1.2.3 < 1.2.5)、minitest (4.7.5 < 5.2.3)、psych (2.0.2 < 2.0.4) , rake (10.1.0 < 10.1.1), rdoc (4.1.0 < 4.1.1), 测试单元 (2.1.0.0 < 2.5.5)

更新 gem gem 更新

使用 成功安装 rails gem install rails --no-ri --no-rdoc

在 rails -v 我得到了 Rails 4.0.3。