Mutating Webhook Lab

Inspired by: https://dev.to/ineedale/writing-a-very-basic-kubernetes-mutating-admission-webhook-5b1

Prereqs:

• Install Kubectl
• Install Kind
• Install docker

Process:

1. Create cluster:

./kind-with-local-registry.sh

## Verify local registy is working
docker pull gcr.io/google-samples/hello-app:1.0
docker tag gcr.io/google-samples/hello-app:1.0 localhost:5001/hello-app:1.0
docker push localhost:5001/hello-app:1.0
kubectl create deployment hello-server --image=localhost:5001/hello-app:1.0
## Verify deployment comes up
kubectl delete deployment hello-server

2. Create webhook TLS artifacts

./ssl/gen_tls.sh

3. Update mutating webhook manifest

## Copy this output and paste into manifest CaBundle section
cat ca.crt | base64 | tr -d '\n'

4. Apply mutating webhook

kubectl apply -f manifests/mutatig-webhook.yaml

5. Build Container and deploy

docker build -t localhost:5001/demo:1.0.0 -f Dockerfile .
docker push localhost:5001/demo:1.0.0

6. Test webhook

kubectl apply -f manifests/test