30 second apache/nginx/gunicorn timeout¶

Tags: django

All our websites go to one single apache machine that proxies out the requests to the various backend servers. (Btw, I think I’d like to replace apache with nginx, but this is what’s running now).

Our latest sites run with gunicorn behind nginx.

One URL took a long time to render. Calculating a year’s worth of data. Longer than 30 seconds. And after 30 seconds I’d get an nginx “502 Bad Gateway” error. Looking at the nginx error log I’d see a comment about an upstream gateway unexpectedly closing the connection.

• Nginx has a proxy_read_timeout. Default is 60 seconds, not 30, but for good measure I set it to 90 seconds. Didn’t help.

• Upstream? What is upstream, what is downstream? I assumed apache would be “up”, as that’s where the request is coming from. There was no relevant timeout setting there.

• Turns out that upstream means where the response is coming from. So gunicorn. And yes, gunicorn by default has a timeout of 30 seconds.

Solution: call gunicorn with --timeout 90.

Now that I’ve written it down I can google it in two years’ time when I’ve forgotten all about it :-) To close it off, here’s a picture of with lots and lots of lines. An apache/nginx/gunicorn problem is less complicated :-)