The Operator Pattern in Kubernetes

Managing simple, stateless applications in Kubernetes is straightforward. But what about complex, stateful applications like databases or message queues?

These applications often require deep operational knowledge for tasks like upgrades, backups, and scaling. Manually managing them can be a huge challenge.

Kubernetes has powerful built-in controllers for managing resources like Deployments and StatefulSets. They handle scaling and self-healing for many applications.

However, they don't understand the specific operational logic of a PostgreSQL database or an Apache Kafka cluster. They can't perform tasks like database schema migrations or Kafka topic management.