apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-nodeport-services
  annotations:
    policies.kyverno.io/title: Disallow NodePort Services
    policies.kyverno.io/category: Zero Trust
    policies.kyverno.io/severity: medium
spec:
  validationFailureAction: Enforce
  background: true
  rules:
    - name: disallow-nodeport
      match:
        any:
          - resources:
              kinds:
                - Service
      exclude:
        any:
          - resources:
              namespaces:
                - kube-system
                - istio-system
      validate:
        message: "NodePort services are not allowed. Use ClusterIP or LoadBalancer."
        pattern:
          spec:
            type: "!NodePort"