Kubebuilder Operator Build

KUBERNETES OPERATOR DEPLOYMENT

CUSTOM RESOURCE DEFINITION (CRD)
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: appdeployments.mycompany.io
spec:
  group: mycompany.io
  names:
    kind: AppDeployment
  scope: Namespaced
  versions:
  - name: v1
    served: true
    storage: true
    schema:
      openAPIV3Schema:
        properties:
          spec:
            properties:
              replicas: {type: integer}
              image: {type: string}
              env: {type: array}

OPERATOR WORKFLOW (Pseudo-code)
1. Watch AppDeployment resources in cluster
2. On create: generate Deployment, Service, PVC manifests
3. On update: reconcile desired state (scale replicas, update image)
4. On delete: cascade cleanup (keep PVC for data safety)
5. Health probe: restart pods on 3 failed liveness checks

DEPLOYMENT CHECKLIST
✓ Operator container: published to registry.mycompany.com:latest
✓ RBAC: operator SA has get/list/watch/patch on Deployments, Services, PVCs
✓ Leader election: enabled (single operator instance safe)
✓ Finalizers: protect PVC deletion (manual approval required)
✓ Webhooks: validate AppDeployment spec (image must be tagged, replicas 1-10)

EXAMPLE: Create instance
kubectl apply -f - <<EOF
apiVersion: mycompany.io/v1
kind: AppDeployment
metadata:
  name: myapp
spec:
  replicas: 3
  image: myregistry.com/myapp:v1.2.0
  env:
  - name: DB_HOST
    value: postgres.default.svc.cluster.local
EOF

Status: Operator creates 3 pods, 1 service, routes traffic automatically