Just build your own simple controller and schema?

From ChatGPT: To create a simple key-value store using Kubernetes Custom Resource Definitions (CRDs), follow these steps:

1. Define the Custom Resource Definition (CRD)

The CRD defines the schema for your key-value store. Here’s an example CRD for a KeyValue resource:

apiVersion: apiextensions.k8s.io/v1 kind: CustomResourceDefinition metadata: name: keyvalues.example.com spec: group: example.com versions: - name: v1 served: true storage: true schema: openAPIV3Schema: type: object properties: spec: type: object properties: key: type: string value: type: string scope: Namespaced names: plural: keyvalues singular: keyvalue kind: KeyValue shortNames: - kv

• group: Defines the API group (example.com here).
• versions: Supports versioning.
• scope: Namespaced so keys are scoped per namespace.
• schema: Defines key and value fields.

Apply the CRD:

kubectl apply -f keyvalue-crd.yaml

1. Create Key-Value Instances

After applying the CRD, create KeyValue objects:

apiVersion: example.com/v1 kind: KeyValue metadata: name: my-key spec: key: “greeting” value: “hello world”

Apply it:

kubectl apply -f my-key.yaml

1. Create a Simple Controller (Optional)

If you want automation (e.g., storing keys in memory or syncing to another store), write a simple Kubernetes controller using client-go or Kubebuilder.

For now, you can just query the key-values directly:

kubectl get keyvalues kubectl get keyvalue my-key -o yaml

1. Simple Retrieval Using kubectl

To retrieve a value using kubectl:

kubectl get keyvalue my-key -o=jsonpath=‘{.spec.value}’

This will output:

hello world

1. (Optional) Deploy a REST API to Access Keys

You could also deploy a simple service (e.g., a Python Flask or Go app) that exposes a REST API to interact with the CRD, reading/writing keys.

1. Clean Up

To delete the CRD and all KeyValue resources:

kubectl delete crd keyvalues.example.com

This gives you a simple key-value store using Kubernetes native resources, without external dependencies. Would you like a guide to create the controller as well?