How do I restart celery workers gracefully?

Question

While issuing a new build to update code in workers how do I restart celery workers gracefully?

Edit: What I intend to do is to something like this

Answer 1

If you're going the kill route, pgrep to the rescue:

kill -9 `pgrep -f celeryd`

Mind you, this is not a long-running task and I don't care if it terminates brutally. Just reloading new code during dev. I'd go the restart service route if it was more sensitive.