Implement Kubernetes network policies
Secure Kubernetes networking
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Write Kubernetes NetworkPolicy manifests to implement zero-trust networking for a [microservices application]. Allow only necessary communication: [describe service communication requirements]. Add a default deny-all policy per namespace, allow DNS resolution, and permit monitoring scraping from the prometheus namespace.
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Assurez-vous de créer une politique `DenyAll` avec `podSelector: {}` avant toute règle d’autorisation : Kubernetes évalue toutes les politiques en union, donc l’absence de refus explicite laisse tout passer. Pour DNS, autorisez l’egress vers `kube-dns` (port 53/UDP). Utilisez des sélecteurs de namespace et de pod précis (via `matchLabels`) pour éviter les fuites inter-namespaces. Testez avec `kubectl run --image=alpine -it` en vérifiant les connexions bloquées.
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