Gunicorn worker timeout error

Question

I have setup gunicorn with 3 workers 30 worker connections and using eventlet worker class. It is setup behind Nginx. After every few requests, I see this in the logs.

Answer 1

We had the same problem using Django+nginx+gunicorn. From Gunicorn documentation we have configured the graceful-timeout that made almost no difference.

After some testings, we found the solution, the parameter to configure is: timeout (And not graceful timeout). It works like a clock..

So, Do:

1) open the gunicorn configuration file

2) set the TIMEOUT to what ever you need - the value is in seconds

NUM_WORKERS=3
TIMEOUT=120

exec gunicorn ${DJANGO_WSGI_MODULE}:application \
--name $NAME \
--workers $NUM_WORKERS \
--timeout $TIMEOUT \
--log-level=debug \
--bind=127.0.0.1:9000 \
--pid=$PIDFILE

Answer 2

Run Gunicorn with --log-level debug.

It should give you an app stack trace.

Answer 3

If you are using GCP then you have to set workers per instance type.

Link to GCP best practices https://cloud.google.com/appengine/docs/standard/python3/runtime