StatefulSets for Stateful Apps

Welcome! In this lesson, we'll dive into StatefulSets, a Kubernetes object designed to manage stateful applications.

Unlike stateless apps (which are easily scaled and replaced), stateful apps require unique identities and persistent storage for each instance. Think databases, message queues, or custom applications that store data locally.

Traditional Deployments are great for stateless applications. If a Pod dies, a new one replaces it, and it doesn't matter which one serves the request.

But for stateful apps, each replica often needs a stable, unique identity and its own dedicated storage. If a database Pod restarts, it needs to reconnect to its specific data volume.