Cloud Foundry: The Definitive Guide

Chapter 6. Diego

Diego is the container runtime architecture for Cloud Foundry. It is responsible for managing the scheduling, orchestration, and running of containerized workloads. Essentially, it is the heart of Cloud Foundry, running your applications and one-off tasks in containers, hosted on Windows and Linux backends. Most Cloud Foundry users (e.g., developers) do not interact with Diego directly. Developers interact only with Cloud Foundry’s API, known as CAPI. However, comprehending the Diego container runtime is essential for Platform Operators because, as an operator, you are required to interact with Diego for key considerations such as resilience requirements and application troubleshooting. Understanding Diego is essential for understanding how workloads are deployed, run, and managed. This understanding also provides you with an appreciation of the principles underpinning container orchestration.

This chapter explores Diego’s concepts and components. It explains the purpose of each Diego service, including how the services interrelate as state changes throughout the system.

Implementation Changes

It is important to understand the fundamental concepts of the Diego system. The specific technical implementation is less consequential because it is subject to change over time. What Diego does is more important than how it does it.

Why Diego?

Residing at the core of Cloud Foundry, Diego handles the scheduling, running, and monitoring of tasks and long-running processes ...