Django Celery Logging Best Practice

Question

I\'m trying to get Celery logging working with Django. I have logging set-up in settings.py to go to console (that works fine as I\'m hosting on

Answer 1

It is troubling that Celery interferes with the root logger (which is not best practice and can't be controlled completely), but it does not disable your app's custom loggers in any way, so use your own handler names and define your own behavior rather than trying to fix this issue with Celery. [I like to keep my application logging separate anyway). You could use separate handlers or the same for Django code and Celery tasks, you just need to define them in your Django LOGGING config. Add formatting args for module, filename, and processName to your formatter for sanity, to help you distinguish where messages originate.

[this assumes you have setup a handler for 'yourapp' in the LOGGING settings value that points to an Appender - sounds like you are aware of this though].

views.py

log = logging.getLogger('yourapp')
def view_fun():
    log.info('about to call a task')
    yourtask.delay()

tasks.py

log = logging.getLogger('yourapp')
@task
def yourtask():
    log.info('doing task')

For the logging that Celery generates - use the celeryd flags --logfile to send Celery output (eg, worker init, started task, task failed) to a separate place if desired. Or, use the other answer here that sends the 'celery' logger to a file of your choosing.

Note: I would not use RotatingFileHandlers - they are not supported for multi-process apps. Log rotation from another tool like logrotate is safer, same goes with logging from Django assuming you have multiple processes there, or the same log files are shared with the celery workers. If your using a multi-server solution you probably want to be logging somewhere centralized anyway.