Sample Controller(Foo Controller)

This Controller is developed by Kubebuilder v2.2.0

インプレスR&D NextPublishing「実践入門 Kubernetesカスタムコントローラーへの道」の第五章に掲載したサンプルコード用のリポジトリです。

https://nextpublishing.jp/book/11389.html

Admission Webhookのサンプルはadmission_webhookに、
Conversion Webhookのサンプルはmulti_conversionに用意しています。

What is this Controller

This Controller reconcile foo custom resource.
Foo resource owns deployment object.

We define foo.spec.deploymentName & foo.spec.replicas.
When we apply foo, then deployment owned by foo is created.

If we delete deployment object like 'kubectl delete deployment/<deployment name>',
foo reconcile it and the deployment is created again.

Or if we scale deployment object like 'kubectl scale deployment/<deployment name> --replicas 0',
foo reconcile it and the deployment keeps the foo.spec.replicas.

How to run

Before you start this operator, you must prepare the kubernetes cluster using like Minikube, Kind.

Clone source code

$ mkdir -p $GOPATH/src/github.com/govargo
$ cd $GOPATH/src/github.com/govargo
$ git clone https://github.com/govargo/foo-controller-kubebuilder.git
$ cd foo-controller-kubebuilder

Run localy

$ make install
$ make run
$ kubectl apply -f config/samples/samplecontroller_v1alpha1_foo.yaml

Run container as Deployment

$ make install
$ make deploy
$ kubectl apply -f config/samples/samplecontroller_v1alpha1_foo.yaml

Reference

This project is inspired by

• https://github.com/kubernetes/sample-controller
• https://github.com/jetstack/kubebuilder-sample-controller