Celery is an open source asynchronous task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well.
$ docker run --link some-rabbit:rabbit --name some-celery -d celery
$ docker run --link some-rabbit:rabbit --rm celery celery status
$ docker run --link some-redis:redis -e CELERY_BROKER_URL=redis://redis --name some-celery -d celery
$ docker run --link some-redis:redis -e CELERY_BROKER_URL=redis://redis --rm celery celery status