This is a sample CustomResourceDefinition (CRD) and Controller to extend the API running in Kubernetes clusters. Blog post about it here.
Download and install Kubebuilder, Kustomize, and Kind to run your Kubernetes cluster locally. I prefer Kind over Minikube since it starts up faster, but you’re welcome to use any tool to deploy your cluster.
Then compile, install, and run locally:
$ make
go build -o bin/manager main.go
$ make install
kustomize build config/crd | kubectl apply -f -
customresourcedefinition.apiextensions.k8s.io/webpages.sandbox.rvmiller.com created
$ make run
2020-07-04T22:21:21.748-0400 INFO setup starting manager
...Deploy an example custom resource:
webpage.yaml
apiVersion: sandbox.rvmiller.com/v1beta1
kind: WebPage
metadata:
name: sample-web-page
spec:
html: |
<html>
<head>
<title>WebPage CRD</title>
</head>
<body>
<h2>This page served from a Kubernetes CRD!</h2>
</body>
</html>$ kubectl apply -f webpage.yaml
webpage.sandbox.rvmiller.com/sample-web-page created
$ kubectl get configmaps
NAME DATA AGE
sample-web-page-config 1 10m
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
sample-web-page-nginx 1/1 Running 0 10m
$ kubectl port-forward sample-web-page-nginx 7070:80
Forwarding from 127.0.0.1:7070 -> 80
Forwarding from [::1]:7070 -> 80Then you can see nginx serving the webpage: