example

This example project implements a controller for ConfigMapCount CRD, which looks like this:

apiVersion: silly.example.org/v1alpha1
kind: ConfigMapCount
metadata:
  name: configmapcount-sample
  namespace: default
status:
  configMaps: 3

This ((not) very useful) API object counts ConfigMaps in the same namespace and puts the count into its .status.configMaps field.

Pre-requisites

Have your Kubernetes cluster ready. One great option is kind:

Build and Install

If you made any changes to API types, you need to generate Go and CRD YAML code:

make generate

To install the CRDs into your Kubernetes cluster:

make install

Run the controller

Run against the configured Kubernetes cluster in ~/.kube/config

make run