在AWS Linux上增加RestClient/Net :: HTTP中的connect(2)超时

Question

我正在使用rest-client来POST一个非常慢的Web服务.我设置timeout为600秒,我已经确认它正在传递给Net :: HTTP @read_timeout和@open_timeout.

但是,大约两分钟后,我得到一个低级超时错误,Errno::ETIMEDOUT: Connection timed out - connect(2):

回溯的相关部分是

Operation timed out - connect(2) for [myhost] port [myport]
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:879:in `initialize'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:879:in `open'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:879:in `block in connect'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/timeout.rb:88:in `block in timeout'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/timeout.rb:98:in `call'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/timeout.rb:98:in `timeout'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:878:in `connect'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:863:in `do_start'
/Users/dmoles/.rvm/rubies/ruby-2.2.5/lib/ruby/2.2.0/net/http.rb:852:in `start'
/Users/dmoles/.rvm/gems/ruby-2.2.5/gems/rest-client-2.0.0/lib/restclient/request.rb:766:in `transmit'
/Users/dmoles/.rvm/gems/ruby-2.2.5/gems/rest-client-2.0.0/lib/restclient/request.rb:215:in `execute'
/Users/dmoles/.rvm/gems/ruby-2.2.5/gems/rest-client-2.0.0/lib/restclient/request.rb:52:in `execute'

看起来抛出错误的代码行是

TCPSocket.open(conn_address, conn_port, @local_host, @local_port)

好像底层connect(2)系统调用的超时时间大约是两分钟,而传递给Net :: HTTP的超时参数只能缩短它,而不能延长它.有没有办法修改套接字参数来设置更长的超时？

编辑添加:这似乎只是我们的AWS Linux服务器上的问题 - 在我的MacOS开发机器上,十分钟超时工作.我假设connect()MacOS/BSD上的默认超时时间更长,但我真的不知道.

Answer 1

首先，您可以只增加tcp_syn_retries更新/proc/sys/net/ipv4/tcp_syn_retries文件的配置。参考这里。

如果 if 不起作用，我认为您需要激活SO_KEEPALIVE或TCP_USER_TIMEOUT选项。但可能在rest-client.

因此，也许您需要自己制作一个叉子或创建Socket和。Socket::Option

Mike Perham 在他的博客中写到了这一点。