Question

RabbitMQ now seems to be working correctly. However, when I try

python -m celery.bin.celeryd --loglevel=INFO` 

(regular celeryd doesn’t work), I get the error

No handlers could be found for logger “multiprocessing”`).

Here’s the full output (redacted slightly):

[2011-06-06 02:08:08,105: WARNING/MainProcess] -------------- celery@blahblah v2.2.6
---- **** -----
--- * ***  * -- [Configuration]
-- * - **** ---   . broker:      amqplib://blah@localhost:5672/vhost
- ** ----------   . loader:      celery.loaders.default.Loader
- ** ----------   . logfile:     [stderr]@INFO
- ** ----------   . concurrency: 2
- ** ----------   . events:      OFF
- *** --- * ---   . beat:        OFF
-- ******* ----
--- ***** ----- [Queues]
 --------------   . celery:      exchange:celery (direct) binding:celery


[Tasks]
  . tasks.add
[2011-06-06 02:08:08,812: WARNING/MainProcess] celery@blahblah has started
.
No handlers could be found for logger "multiprocessing"
No handlers could be found for logger "multiprocessing"

I’d really like to get this set up properly, so I can move on to using it with Django!

(It is not my first no handlers found error, but I’m having trouble finding anything on the web regarding this…)

Answer 1

There seems to be something strange in the way celery initializes logging. If I put the switch --logfile=yourfile.log on the command-line, it works reliably, but reading the logging from the config gives unreliable results including the stuff you’re seeing.