Celery on AWS ECS - Complete Guide

This article provides a comprehensive guide to deploying Celery workers on AWS ECS, addressing common pitfalls such as task loss during scaling and deployments, tasks never fully processed due to frequent interruptions, and long task delays. It explains how ECS task interruptions (SIGTERM/SIGKILL) interact with Celery's default settings (task_acks_late, task_reject_on_worker_lost, confirm_publish), leading to lost or stuck tasks. The article offers solutions for each problem, including configuration changes and best practices for reliable task processing in a cloud environment. It includes references to a full example repository and is aimed at developers using Celery with AWS ECS for scalable applications.