A Kubernetes operator is a pair of a custom resource definition (CRD) and a controller program for acting on that custom resource. Use this tag for questions about writing controller code and other details of implementing operators.
A Kubernetes operator is a pair of a custom resource definition (CRD) and a controller. The controller is a program that runs inside the Kubernetes cluster and uses the Kubernetes API to monitor instances of that custom resource and take some action. This provides a path to extend Kubernetes by adding your own custom objects to the API.
Controllers are frequently written in go, though this is not a hard requirement. kubebuilder is one popular toolkit for this, maintained by the Kubernetes project.
Use the kubernetes-operator tag for questions about writing your own operator. It will generally be correct to also tag questions with kubernetes and the tag for your implementation language, and for your toolkit if it has its own tag.
Note that, as with all Stack Overflow questions, questions about Kubernetes operators must be programming-related. Questions about installing or using a prebuilt operator are off-topic for Stack Overflow, and might be better asked on another Stack Exchange site like DevOps.SE or Server Fault.
