Kopf demo

This is a demo of Kopf, a framework for Kubernetes operators. The demo itself was prepared for the Pycon.sk 2022 talk.

The goal

• Create PythonApplication object in Kubernetes

• Operator should start Job corresponding to the PythonApplication object

• After Job is finished, Operator should update PythonApplication object with the result

• Profit!

How to run

• Bring your own Kubernetes cluster. I used minikube for this demo.

   minikube start --memory=4096M --cpus=2 --disk-size=20gb --kubernetes-version=v1.24.9 --driver=virtualbox
  

• Create PythonApp CRD

  kubectl apply -f deployment/crds.yaml
  

• run the operator locally (in a separate background terminal)

  kopf run main.py --verbose
  

  This step may require to create and use Python virtualenv. ( aka poetry run shell )

• create PythonApplication object and watch Job resource being created.

  kubectl apply -f test-manifests/hello-world.yml -n default
  

• drop PythonApplication object.

  kubectl delete -f test-manifests/hello-world.yml -n default
  

  The Job and Pod objects shall disappear too.

License

CC0 1.0 Universal (CC0 1.0). Public Domain Dedication.

No warranty. Use at your own risk. It it breaks, you should keep both pieces.