python broker_url = 'redis://localhost:6379/0' result_backend = 'redis://localhost:6379/0' python broker_url = 'amqp://guest:guest@localhost:5672//' result_backend = 'amqp://' shell celery -A your_module_name worker --concurrency=8 shell celery -A your_module_name worker --concurrency=4 -n worker1@%h celery -A your_module_name worker --concurrency=4 -n worker2@%h python python