How to get nodename of running celery worker? - celery

Question

I want to shut down celery workers specifically. I was using app.control.broadcast('shutdown'); however, this shutdown all the workers; therefore, I would like to pass the destination parameter.
When I run ps -ef | grep celery, I can see the --hostname on the process.
I know that the format is {CELERYD_NODES}{NODENAME_SEP}{hostname} from the utility function nodename
destination = ''.join(['celery', # CELERYD_NODES defined at /etc/default/newfies-celeryd
'#', # from celery.utils.__init__ import NODENAME_SEP
socket.gethostname()])
Is there a helper function which returns the nodename? I don't want to create it myself since I don't want to hardcode the value.

Answer 1

I am not sure if that's what you're looking for, but with control.inspect you can get info about the workers, for example:
app = Celery('app_name', broker=...)
app.control.inspect().stats() # statistics per worker
app.control.inspect().registered() # registered tasks per each worker
app.control.inspect().active() # active workers/tasks
so basically you can get the list of workers from each one of them:
app.control.inspect().stats().keys()
app.control.inspect().registered().keys()
app.control.inspect().active().keys()
for example:
>>> app.control.inspect().registered().keys()
dict_keys(['worker1#my-host-name', 'worker2#my-host-name', ..])