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!

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.

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.