Run a Stateful App on Kubernetes with HTTPS and Persistent Storage

What you will build

A small but complete Kubernetes application: web, database, storage, TLS and configuration done properly.

Starting point: you only need a Vultr account. This challenge is self-contained, so you can do it without having done any other.

The requirements

• A Deployment for the app and a StatefulSet or Deployment for the database
• A PersistentVolumeClaim backed by Vultr Block Storage
• An Ingress controller with a certificate from cert-manager and Let's Encrypt
• Configuration in a ConfigMap and credentials in a Secret, not in the image
• Readiness and liveness probes on the app
• A rolling update shown without errors

The drill

1. Write a record through the app
2. Delete the database pod with kubectl
3. Wait for it to come back
4. Read the record again and confirm it survived
5. Push a new image tag and watch the rolling update

kubectl delete pod -l app=db
kubectl get pods -w
kubectl get pvc

Destroy the cluster and any load balancers or volumes it created when you are done so you are not billed for them.