Celery is the most widely used open source best message broker software

Celery Free Message Queue Software

Python-based Most Widely Deployed Open Source Message Broker

Celery is an asynchronous open-source task or job queue based on a distributed message queue. It offers queue scheduling focusing on real-time operations.


Celery is an open source, flexible, and reliable distributed message queue system to process vast amounts of messages. It is a task queue with focus on real-time processing while it also supports task scheduling. Celery is licensed under the BSD License. Celery has a simple asynchronous process queue or job queue which is based on distributed message passing. The execution units or process tasks are executed concurrently on a single or more worker nodes using multiprocessing, eventlet or gevent. Celery tasks run asynchronously in the background or synchronously.

Celery message broker software is written using Python but the protocol can be implemented in any language. Celery message queue software is used in production systems like for Instagram, to process millions of tasks every day. It can also work with other programming languages using webhooks. There is a PHP client, Go client, a Node.js client and a Ruby-Client called RCelery. Celery is an open source message queue with 18.4K GitHub stars and 4.2K GitHub forks.

System Requirements

Celery is a Python package that integrates with Redis or RabbitMQ. Celery version 5.1.2 runs on:

  • Python v3.6+
  • Django 2.2+
  • Redis
  • Git


Some of the key features of Celery best message queue are listed below:

  • Scheduling
  • Monitoring
  • High availability
  • Horizontal scaling
  • Autoreloading
  • Resource Leak Protection
  • Workflows
  • Time and Rate Limits
  • Autoscaling
  • User Components
  • Open Source

Installation Instructions

Install Celery on Ubuntu

Celery best message broker is simple and easy to get started software. First, ensure that all the depency packages of Celery are installed and up to date. Below guide covers Celery installation on Debian and Ubuntu including distributions based on them. Please follow the instructions below to setup Celery. Update your system with command:

    sudo apt update && sudo apt upgrade

Next, install celery by running command:

    pip install -U celery

If you’re installing RabbitMQ on Ubuntu or Debian then execute this command:

    sudo apt-get install rabbitmq-server

If you’re using Redis as the backend so make sure You install Redis via apt on Ubuntu by command:

    sudo apt-get install redis-server

Additionally, Celery defines a single or a group of bundles that can be used to install Celery and the required dependencies with command:

    pip install "celery[librabbitmq]"
    pip install "celery[librabbitmq,redis,auth,msgpack]"

For a complete list of the command line options please run:

    celery worker --help
    celery --help

For RabbitMQ you can use amqp://localhost or for Redis you can use redis://localhost.

Congratulations! You have successfully installed Celery queuing service on ubuntu. Enjoy!


What is celery system?

Celery is a simple, flexible, and reliable distributed system to process vast amounts of messages, while providing operations with the tools required to maintain such a system. It’s a task queue with focus on real-time processing, while also supporting task scheduling.

Is celery open source?

Celery is an open source asynchronous task queue or job queue which is based on distributed message passing. While it supports scheduling, its focus is on operations in real time.

Who is using celery?

Who uses Celery? 433 companies reportedly use Celery open source message broker in their tech stacks, including Udemy, Robinhood, and Accenture.

What is the difference between celery and RabbitMQ?

Celery os distributed task queue. Celery is an asynchronous task queue or job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well; RabbitMQ is a messaging broker - an intermediary for messaging. RabbitMQ gives your applications a common platform to send and receive messages, and your messages a safe place to live until received.

Does Instagram use celery?

Instagram uses celery technology as its primary task managing tool.


In this article we discussed about celery. To learn about other message queue (MQ) software, please visit following pages: