Apache mod_wsgi python server is giving 503

[Darshan Patil]

Hi,

I have my apache server where I am using mod_wsgi to run python endpoints which serve images from the server. There are lot of requests hitting the server and I started seeing errors like following:

Python has shutdown.

Connection closed to child with abortive shutdown.

Resource temporarily unavailable: mod_wsgi (pid=1211): Unable to connect to WSGI daemon process 'app' on '/run/httpd/wsgi.10.0.1.sock' after multiple attempts as listener backlog limit was exceeded or the socket does not exist.

I am not sure what is going on here, can anybody has clue what the problem could be? And how can I scale with mod_wsgi and python.

Thanks,

Darshan

[Graham Dumpleton]

Can you supply the full log messages below from Apache error log with any prefixes so I can identify what output them.

The mod_wsgi code does emit a message "Python has shutdown", but doesn't emit a message "Connection closed to child with abortive shutdown".

So is important that can see the full log messages include any date/time stamp and prefixes. Any other messages around that time would also be useful.

If I had to guess, you are using some third party package for Python which assumes that if it has an internal error message that it can force a process shutdown using a signal or call of C level exit() function.

Also, although you see the messages "Resource temporarily unavailable" are they transient and after a moment requests start to be processed again?

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