kubernetes network policy example

k8s-netpol.yaml

kind: NetworkPolicy
apiVersion: extensions/v1beta1
metadata:
  name: access-nginx
  namespace: secret
spec:
  podSelector:
    matchLabels:
      run: nginx
  ingress:
  - from:
    - namespaceSelector:
        matchExpressions:
        - key: Namespace
          operator: NotIn
          values:
          - secret
    ports:
    - protocol: TCP
      port: 80