我有几个专用服务器，有些后台工作人员有时会在重启前运行几天。当发生这种情况时（似乎它们运行超过24小时）然后我开始出现这样的错误：
getaddrinfo: Temporary failure in name resolution
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/smtp.rb:540:in `open'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/smtp.rb:540:in `tcp_socket'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/smtp.rb:549:in `block in do_start'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/timeout.rb:99:in `timeout'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/smtp.rb:549:in `do_start'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/smtp.rb:519:in `start'
来自该特定进程的所有远程调用都会发生错误，直到它重新启动（不是硬件/服务器重启，只是ruby进程）。我已经仔细检查/确认重新启动进程是一个修复程序，因为我已经尝试通过SSH连接到服务器，然后在发生故障的情况下运行一个新进程，这个进程可以完美运行，而有问题的进程仍然失败
所以我的问题是，为什么会发生这种情况，如何以其他方式解决问题，而不是每天重新启动流程？
我正在使用ruby 1.9.3 p194并使用sidekiq gem处理后台作业（但我不怀疑那个人应该对这个混乱负责）。
服务器位于http://www.hetzner.de（但我不认为它们应该受到责备，因为它正在进行中）
更新
除了上面的smtp调用错误，我在做简单的http请求时也会遇到这样的错误。这也会在重新启动进程后解决：
# (Errno::EHOSTUNREACH) "No route to host - connect(2)"
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent/ssl_reuse.rb:29:in `initialize'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent/ssl_reuse.rb:29:in `open'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent/ssl_reuse.rb:29:in `block in connect'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/timeout.rb:54:in `timeout'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/timeout.rb:99:in `timeout'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent/ssl_reuse.rb:29:in `connect'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/http.rb:755:in `do_start'
/home/deployer/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/net/http.rb:750:in `start'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent.rb:628:in `start'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent.rb:888:in `reset'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent.rb:567:in `connection_for'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persistent.rb:926:in `request'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/mechanize-2.5.1/lib/mechanize/http/agent.rb:258:in `fetch'
/home/deployer/apps/au/shared/bundle/ruby/1.9.1/gems/mechanize-2.5.1/lib/mechanize.rb:407:in `get'