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30 NetworkPolicy Troubleshooting

Dieses Lab zeigt eine funktionierende App und danach eine schrittweise NetworkPolicy-Reparatur: erst Default-Deny, dann DNS-Egress, dann Backend-Traffic.

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30 NetworkPolicy Troubleshooting

Dieses Lab zeigt eine funktionierende App und danach eine schrittweise NetworkPolicy-Reparatur: erst Default-Deny, dann DNS-Egress, dann Backend-Traffic.

Prüfen

bash
kubectl apply --dry-run=client -f manifests/
01 / 04

Ausführung

bash
kubectl apply -f manifests/00-workloads.yaml
kubectl exec -n netpol-troubleshooting deploy/frontend -- wget -qO- http://backend:8080

kubectl apply -f manifests/10-default-deny.yaml
kubectl exec -n netpol-troubleshooting deploy/frontend -- wget -qO- http://backend:8080

kubectl apply -f manifests/20-allow-dns.yaml
kubectl apply -f manifests/30-allow-backend.yaml
kubectl exec -n netpol-troubleshooting deploy/frontend -- wget -qO- http://backend:8080
02 / 04

Lernpunkte

  • NetworkPolicies sind additiv.
  • Default-Deny blockiert Ingress und Egress.
  • DNS-Egress und Backend-Egress sind unterschiedliche Freigaben.
  • Backend-Ingress muss zusätzlich erlaubt werden.
03 / 04

Cleanup

bash
kubectl delete namespace netpol-troubleshooting
04 / 04

K8S · Orthevs Academy

31 modules as one continuous learning path.

The sequence remains unchanged: from the lab skeleton through technical foundations and operating models to final troubleshooting. The technical directory names are deliberately preserved.

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