allow-dns-egress.yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-dns-egress
  namespace: keycloak
spec:
  podSelector: {}
  policyTypes:
    - Egress
  egress:
    - to:
        - namespaceSelector:
            matchLabels:
              name: kube-system
      ports:
        - protocol: UDP
          port: 53
        - protocol: TCP
          port: 53
        - protocol: TCP
          port: 5432
        - protocol: TCP
          port: 456
        - protocol: TCP
          port: 567