Simple Kubernetes Network Policy to open up a pod port

Below shows a very simple Kubernetes Network Policy object. This simply opens up port 80 to the outside in a locked-down environment. The key tags to understand are run, which should be a label on the pod you wish to match, and the ports block under ingress. This should be a list specifiying the ports you wish to open.

---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: ingress-to-nptest
  namespace: default
spec:
  podSelector:
    matchLabels:
      run: np-test-1
  policyTypes:
  - Ingress
  ingress:
  - ports:
    - protocol: TCP
      port: 80