high level overview of the architecture. The broker pushes tasks to the worker servers. A worker server is a networked machine running celeryd. This can be one or more machines depending on the workload clustering when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your dads laptop while the queue is temporarily overloaded). Concur- rency Tasks are • Installing RabbitMQ on OS X – Configuring the system hostname – Starting/Stopping the RabbitMQ server 1.2.1 Installing RabbitMQ See Installing RabbitMQ over at RabbitMQ’s website. For Mac OS X see

clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concur- rency routing model you can route tasks to different workers, or select different message topologies, by configuration or even at runtime. Remote- control Worker nodes can be controlled from remote by using broadcast Installation & Configuration • Installing the RabbitMQ Server – Setting up RabbitMQ – Installing RabbitMQ on OS X * Configuring the system host name * Starting/Stopping the RabbitMQ server Installation

clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concur- rency routing model you can route tasks to different workers, or select different message topologies, by configuration or even at runtime. Remote- control Worker nodes can be controlled from remote by using broadcast Installing RabbitMQ on OS X – Configuring the system host name – Starting/Stopping the RabbitMQ server 1.2.1 Installing RabbitMQ See Installing RabbitMQ over at RabbitMQ’s website. For Mac OS X see

. . . . . . 65 3 Configuration and defaults 67 3.1 Example configuration file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 3.2 Configuration Directives . . . . clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concur- rency routing model you can route tasks to different workers, or select different message topologies, by configuration or even at runtime. Remote- control Worker nodes can be controlled from remote by using broadcast

tasks, Subtasks and Callbacks HTTP Callback Tasks (Webhooks) Routing Tasks Configuration and defaults Example configuration file Concurrency settings Task result backend settings Database backend settings backend settings Messaging settings Task execution settings Worker: celeryd Periodic Task Server: celerybeat Monitor Server: celerymon Cookbook Creating Tasks Running celeryd as a daemon Tutorials Tutorials Tasks - celery.execute Task Result - celery.result Task Information and Utilities - celery.task Configuration - celery.conf Remote Management of Workers - celery.task.control HTTP Callback Tasks - celery

. . . . . . 77 3 Configuration and defaults 83 3.1 Example configuration file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 3.2 Configuration Directives . . . . clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concur- rency routing model you can route tasks to different workers, or select different message topologies, by configuration or even at runtime. Remote- control Worker nodes can be controlled from remote by using broadcast

. . . . . . 62 3 Configuration and defaults 63 3.1 Example configuration file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 3.2 Configuration Directives . . . . Utilities - celery.task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 9.7 Configuration - celery.conf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 9.27 Celery Periodic Task Server - celery.bin.celerybeat . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 9.28 celeryev:

Guide Tasks Executing Tasks HTTP Callback Tasks (Webhooks) Routing Tasks Configuration and defaults Example configuration file Concurrency settings Task result backend settings Database backend settings backend settings Messaging settings Task execution settings Worker: celeryd Periodic Task Server: celerybeat Monitor Server: celerymon Cookbook Creating Tasks Running celeryd as a daemon Unit Testing Tutorials Tasks - celery.execute Task Result - celery.result Task Information and Utilities - celery.task Configuration - celery.conf Remote Management of Workers - celery.task.control HTTP Callback Tasks - celery

Tasks (Webhooks) Routing Tasks Monitoring and Management Guide Optimizing Concurrency Signals Configuration and defaults Cookbook Contributing Community Resources Tutorials Frequently Asked Questions Change Beanstalk First steps with Celery Choosing your Broker Creating a simple task Configuration Running the celery worker server Executing the task Where to go from here Resources Getting Help Bug tracker clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concurrency Concurrency

Callback Tasks (Webhooks) Routing Tasks Monitoring and Management Guide Optimizing Concurrency Configuration and defaults Cookbook Contributing Community Resources Tutorials Frequently Asked Questions Change Installing RabbitMQ on OS X First steps with Celery Creating a simple task Configuration Running the celery worker server Executing the task Where to go from here Resources Getting Help Bug tracker clustering and HA when used in combination with RabbitMQ. You can set up new workers without central configuration (e.g. use your grandma’s laptop to help if the queue is temporarily congested). Concurrency Concurrency