getaddrinfo：节点名或服务名提供，或不知道
我在运行Mac OS X 10.6的计算机上部署了一个Ruby on Rails应用程序。 出现问题的代码由delayed_job运行。 只有通过delayed_job运行时才会出现问题。 如果我在控制台（ rails console production ）中运行它，或者通过cURL直接调用API，它没有任何问题。 而且，整个过程在我的开发环境中没有问题。
基本上，代码在一个地方工作，但由于某种原因，失败的地方工作。 我已经search并find了一些资源，但没有任何build议适用或有任何区别。 当我login到服务器并运行命令时，一切正常。 但由于某种原因，当它们由Capistrano运行/启动时，它不起作用。
任何帮助是极大的赞赏。
重要笔记：
- Ruby版本：1.9.2-p0
- Rails版本：3.0.1
- delayed_job版本：最新（来自collectiveidea / delayed_job ）
- rest-client版本：1.6.1
码：
class CallApi < Struct.new(:num) def perform log "Entering perform" apinum = num || 5 log "ApiNum = #{apinum}" results = attempt(2,10) do ActiveSupport::JSON.decode(RestClient.get(API_URL, {:params => {:apinum => apinum}})) end log "Results retrieved. (count: #{results.count})" end def log(message) Delayed::Worker.logger.info "[CallApi] #{Time.now} - #{message}" end end
环境configuration（注：url是假的，但forms与真实的一样）：
API_URL = "http://api.example.org/api_endpoint" # Originally, I had "http://" before the beginning, but found a # post mentioning that Net::Http.start didn't like that. # So I tried it both ways. # The same error occurs regardless of if the "http://" is there.
打电话错误发生的地方：
RestClient.get(API_URL, {:params => {:apinum => apinum}})
错误：
getaddrinfo: nodename nor servname provided, or not known /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:644:in `initialize' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:644:in `open' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:644:in `block in connect' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/timeout.rb:44:in `timeout' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/timeout.rb:87:in `timeout' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:644:in `connect' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:637:in `do_start' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/net/http.rb:626:in `start' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/rest-client-1.6.1/lib/restclient/request.rb:166:in `transmit' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/rest-client-1.6.1/lib/restclient/request.rb:60:in `execute' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/rest-client-1.6.1/lib/restclient/request.rb:31:in `execute' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/rest-client-1.6.1/lib/restclient.rb:68:in `get' /private/var/www/project-gemset/releases/20101109002137/lib/call_api.rb:7:in `block in perform' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/attempt-0.2.0/lib/attempt.rb:70:in `attempt' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/attempt-0.2.0/lib/attempt.rb:114:in `attempt' /private/var/www/project-gemset/releases/20101109002137/lib/call_api.rb:6:in `perform' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/backend/base.rb:77:in `invoke_job' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:118:in `block (2 levels) in run' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/timeout.rb:57:in `timeout' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:118:in `block in run' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/benchmark.rb:309:in `realtime' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:117:in `run' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:176:in `reserve_and_run_one_job' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:102:in `block in work_off' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:101:in `times' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:101:in `work_off' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:76:in `block (2 levels) in start' /Users/api/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/benchmark.rb:309:in `realtime' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:75:in `block in start' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:72:in `loop' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/worker.rb:72:in `start' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:100:in `run' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:79:in `block in run_process' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application.rb:250:in `call' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application.rb:250:in `block in start_proc' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/daemonize.rb:199:in `call' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/daemonize.rb:199:in `call_as_daemon' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application.rb:254:in `start_proc' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application.rb:294:in `start' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application_group.rb:159:in `block (2 levels) in start_all' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application_group.rb:158:in `fork' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application_group.rb:158:in `block in start_all' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application_group.rb:157:in `each' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/application_group.rb:157:in `start_all' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/controller.rb:80:in `run' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons.rb:193:in `block in run_proc' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/cmdline.rb:112:in `call' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons/cmdline.rb:112:in `catch_exceptions' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/gems/daemons-1.1.0/lib/daemons.rb:192:in `run_proc' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:78:in `run_process' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:72:in `block in daemonize' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:70:in `times' /Users/api/.rvm/gems/ruby-1.9.2-p0@project-gemset/bundler/gems/delayed_job-aba9905764c2/lib/delayed/command.rb:70:in `daemonize' script/delayed_job:5:in `'
DNSparsing失败时发生错误。 检查你是否可以从命令行wget（或curl）的APIurl。 更改DNS服务器并进行testing可能会有所帮助。
我今天遇到了类似的情况 – 将应用程序部署到Mac OS X服务器，并在尝试访问外部API时收到“getaddrinfo”消息。 事实certificate，当最初启动应用程序的ssh会话不再处于活动状态时，会发生错误。 这就是为什么一切工作正常，如果你ssh到你的服务器和手动运行命令（或手动启动服务器） – 只要你保持你的SSH会话活着，这个错误不会发生。
无论这是OS X中的一个bug还是一个怪癖，我都不确定。 以下是使我find解决scheme的页面 – http://lists.apple.com/archives/unix-porting/2010/Jul/msg00001.html
我所要做的就是更新我的capistrano任务，使用“nohup”启动应用程序。 所以改变
run "cd #{current_path} && RAILS_ENV=production unicorn_rails -c config/unicorn.rb -D"
至
run "cd #{current_path} && RAILS_ENV=production nohup unicorn_rails -c config/unicorn.rb -D"
为我做了诡计。
希望这有助于某人 – 这是一个相当痛苦的弄清楚！
rest-client的RestClient在parsingURL时需要http: scheme。 它为你调用Net::HTTP ，它不需要http:部分，但是rest-client负责这个。
该url是您尝试访问的实际url吗？ example.org是一个用于testing和文档的有效域，并且可以访问; 我期望“api”和“api_endpoint”部分失败，并在我尝试联系他们时看到。
require 'socket' IPSocket.getaddress('example.org') # => "2620:0:2d0:200::10" IPSocket.getaddress('api.example.org') # => # ~> -:7:in `getaddress': getaddrinfo: nodename nor servname provided, or not known (SocketError) # ~> from -:7:in `<main>'
以下是我使用Curl的内容：
greg-mbp-wireless:~ greg$ curl api.example.org/api_endpoint curl: (6) Couldn't resolve host 'api.example.org' greg-mbp-wireless:~ greg$ curl example.org/api_endpoint <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>404 Not Found</title> </head><body> <h1>Not Found</h1> <p>The requested URL /api_endpoint was not found on this server.</p> <hr> <address>Apache Server at example.org Port 80</address> </body></html> greg-mbp-wireless:~ greg$ curl example.org <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <HTML> <HEAD> <META http-equiv="Content-Type" content="text/html; charset=utf-8"> <TITLE>Example Web Page</TITLE> </HEAD> <body> <p>You have reached this web page by typing "example.com", "example.net","example.org" or "example.edu" into your web browser.</p> <p>These domain names are reserved for use in documentation and are not available for registration. See <a href="http://www.rfc-editor.org/rfc/rfc2606.txt">RFC 2606</a>, Section 3.</p> </BODY> </HTML>
我重新启动了我的电脑（Mac Mountain Lion），问题解决了。 一些事情必须与壳认为它是从互联网断开，我想。
以某种确定的方式重新启动shell也可以解决这个问题。 只是打开一个新的会话/窗口，但没有奏效。
我简单地通过closures和重新打开terminal来解决这个问题。
我看到这个错误与轨道无关。 原来我的testing是试图使用一个太高的端口（大于65535）。
这段代码会产生有问题的错误
require 'socket' Socket.getaddrinfo("127.0.0.1", "65536")
我在尝试开发与Internet断开连接时遇到了错误。 但是，我正在处理的网站需要能够与其他一些网站进行交stream，所以当它不能这样做的时候就会窒息。 连接到互联网修复了错误。
如果以上全部失败，请尝试转换为UNIX行结尾，或者执行：
brew install dos2unix sudo dos2unix -c mac /private/etc/hosts
也许主机编码是错误的。
希望这可以帮助
我有这个问题运行rake db:create 。 这个网页提到了我的DNS问题。 我检查了我的VPN连接，发现它由于某种原因断开连接。 我重新连接，现在耙工作顺利。
为了避免这个问题，我们可以绑定到127.0.0.1而不是localhost ：
bin/rails server -b 127.0.0.1
我得到了同样的错误，当我检查本地主机设置在主机文件它是不知何故未设置。 设置本地主机到127.0.0.1解决了它。
sudo vi /etc/hosts >> 127.0.0.1 localhost
