How does Kubernetes manage application availability and self-healing?

Kubernetes manages application availability and self-healing through its declarative model, controllers, health checks, and automated reconciliation loops. Operators define the desired state, such as the number of replicas and health requirements, and Kubernetes continuously compares the actual state with that desired state, taking corrective actions like restarting containers, rescheduling pods, or replacing failed instances.

Kubernetes is designed around the idea that users describe what they want, not how to achieve it. This desired state is stored in the Kubernetes API server, and controllers continuously work to make the cluster match that state.

For example, a Deployment might specify that an application should always have three running replicas:…