What is the architecture of Kubernetes operators?

What is the architecture of Kubernetes operators?

Kubernetes operators are designed to extend Kubernetes' capabilities. They consist of a controller and a custom resource definition (CRD). The controller watches the state of the cluster and makes changes as needed to ensure the desired state matches the actual state.

Can you explain how the controller works in more detail?

Sure! The controller is a control loop that continuously monitors the state of the cluster. It uses the Kubernetes API to check the current state of the resources and compares it to the desired state defined in the CRD. If there's a discrepancy, the controller takes action to reconcile the state.

What are some common use cases for Kubernetes operators?

Common use cases include managing complex applications like databases, message queues, and other stateful services. Operators can automate tasks such as backups, scaling, and updates.

How do I create my own Kubernetes operator?

You can create your own operator using the Operator SDK, which provides tools and libraries to help you build, test, and deploy your operator. You'll define your CRD, implement the controller logic, and then deploy it to your Kubernetes cluster.