Explore Marathon, a framework built on Apache Mesos that provides fault-tolerant and elastic scale-out architecture for long-lived applications. Learn how Marathon solves common DevOps concerns, including deploying apps on large clusters, service discovery, scaling with demand, and handling failures. Discover the benefits of using Marathon as an init.d for your data center, its REST API for controlling app lifecycles, and support for running Docker containers. Gain insights into Marathon's design goals, key features, workflow, and API capabilities for launching and scaling applications. Examine service discovery options, including HAProxy integration, and review case studies from Twitter and Airbnb. Get started with Marathon and learn how it can reduce infrastructure complexity and provide a self-serve interface for developers to launch apps.