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Simple Copier for K8s Deployments

Deployment copy with different image version and labels.

Example:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  labels:
    app: nginx
  annotations:
    knowshan.github.io/SimpleCopier-image-version: "latest"
    "knowshan.github.io/SimpleCopier-image-replace": |
      "{\"nginx:1.14.2\" : \"nginx:latest\"}"
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

In above case of, SimpleCopier controller will create a new deployment nginx-latest with image nginx:latest (replacing nginx:1.14.2) and labels updated with suffix -latest.

Use cases for having a deployment copy with different image:

• Upgrade tests
• Compare different versions
• Security risk assessment - Check if different image version will pass security gate
• Any other tests and verifications

This will be useful if you're managing Kubernetes resources using tools like Terraform or Helm. Instead of additional provisioning code, you can have a copy of your deployment with separate name, labels and image by simply adding annotations.

ToDo

• Add tests - Ginkgo and kuttl
• Add copier for other Kubernetes resources such as service and ingress
• Explore creating a custom resource for patching - Override database configuration or credentials that shouldn't be shared with the copied deployment