apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: mattermost
spec:
  podSelector:
    matchLabels:
      app: mattermost
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            system: "true"
      - podSelector:
          matchLabels:
            app: nginx-ingress-controller
      ports:
        - protocol: TCP
          port: 8065
  egress:
    - to:
      - podSelector:
          matchLabels:
            app: mysql
      ports:
        - protocol: TCP
          port: 3306
    - to:
        - namespaceSelector:
            matchLabels:
              system: "true"
        - podSelector:
            matchLabels:
              k8s-app: coredns
      ports:
        - protocol: TCP
          port: 53
        - protocol: UDP
          port: 53
