如何调试heroku上的"错误R10(引导超时)"问题

Question

我感兴趣的是有什么步骤可以了解在60秒内发生的事情是什么阻止了发射和通常的原因.

这就是日志文件的外观(不知道实际上是什么)

2013-01-14T10:34:17+00:00 app[web.1]: => Booting Thin
2013-01-14T10:34:17+00:00 app[web.1]: => Call with -d to detach
2013-01-14T10:34:17+00:00 app[web.1]: => Rails 3.2.2 application starting in production on http://0.0.0.0:52216
2013-01-14T10:34:17+00:00 app[web.1]: => Ctrl-C to shutdown server
2013-01-14T10:34:23+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2013-01-14T10:34:23+00:00 heroku[web.1]: Stopping process with SIGKILL
2013-01-14T10:34:24+00:00 heroku[web.1]: Process exited with status 137
2013-01-14T10:34:24+00:00 heroku[web.1]: State changed from starting to crashed

我想如果至少有一个堆栈跟踪显示,当进程被杀死时,它会非常有用.

发生这种情况时你做了什么/检查了什么？

PS:我不是在寻找我的案例的答案,而是一般的步骤,每个人都可以从中受益.

Answer 1

我通常首先通过以下代码(initializers/debug_require.rb)确定宝石花了很长时间:

if ENV['DEBUG_REQUIRE']
  require 'benchmark'

  def require(file)
    @@first ||= Time.now
    rc = false
    ts = Benchmark.measure do
      rc = super
    end
    if ENV['DEBUG_REQUIRE'].to_f < ts.total
      total = ts.format("%t require #{file}")
      from_start = (Time.now - @@first).to_i
      $stdout.puts "#{total} (#{from_start} second(s) from start)"
    end
    rc
  end
end

将其添加到config/boot.rb:

require File.expand_path('../initializers/debug_require', __FILE__)

并设置 heroku config:add DEBUG_REQUIRE=1

观察日志输出是否需要缓慢.