Managing stateless applications
A single Pod is a point of failure. If the node it’s on crashes, the Pod and your application are gone. To build resilient, production-ready systems, you need a way to manage Pods automatically—ensuring a desired number of replicas are always running and healthy. This is the job of Kubernetes controllers. This section focuses on controllers designed for stateless applications, such as web servers or API gateways, where any Pod is interchangeable. We’ll start with the foundational controller, the ReplicaSet, which guarantees a specific number of Pods are running. Then, we’ll build on that concept to explore the Deployment, the most common and powerful controller you’ll use daily for handling rolling updates, rollbacks, and declarative application management.
Foundation of scaling: ReplicaSets
ReplicaSets are a foundational Kubernetes concept that facilitates scaling and self-healing functionality for your applications...
