open socket left in connection
mdounin at mdounin.ru
Thu Sep 27 10:04:17 UTC 2012
On Wed, Sep 26, 2012 at 11:37:31AM -0700, raylu wrote:
> We run nginx in front of a python app through proxy_pass. Occasionally,
> we update the configuration and reload/hup the nginx master. Sometimes,
> we see a line in the error.log like
> 2012/08/08 02:21:31 [alert] 7153#0: open socket #10 left in connection 5
> I see src/os/unix/ngx_process_cycle.c outputs this inside
> ngx_worker_process_exit() but I don't understand the check that it's
> doing before hand. Can someone explain what is going on when this line
> gets output?
It checks if all the sockets are properly closed on process
shutdown (except ones which are expected to be left open, e.g.
listening sockets). If there are sockets which aren't closed - it
will complain with the message in question. This basically means
socket leak somewhere.
If you see this message with recent nginx without 3rd party
modules - you may want to provide more info. Some useful tips how
to debug this may be found here on wiki:
More information about the nginx