homelab-frontend/k8s/network-policy.yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: api-gateway
  namespace: api
  labels:
    app: api-gateway
spec:
  podSelector:
    matchLabels:
      app: api-gateway
  policyTypes:
  - Ingress
  - Egress
  ingress:
  # Allow from ingress-nginx controller (from ingress-nginx namespace)
  - from:
    - namespaceSelector:
        matchLabels:
          name: ingress-nginx
    ports:
    - protocol: TCP
      port: 8080
  # Allow from Prometheus scraping (if in monitoring namespace)
  - from:
    - namespaceSelector:
        matchLabels:
          name: monitoring
    ports:
    - protocol: TCP
      port: 8080
  egress:
  # Kubernetes API server egress is handled by CiliumNetworkPolicy
  # (k8s/cilium-netpol.yaml) using toEntities: kube-apiserver.
  # Standard NetworkPolicy ipBlock doesn't work with Cilium for service VIPs.
  # Allow DNS
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: kube-system
    ports:
    - protocol: UDP
      port: 53
    - protocol: TCP
      port: 53
  # Allow to upstreams (LLM services in llm-serving namespace)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: llm-serving
    ports:
    - protocol: TCP
      port: 80
    - protocol: TCP
      port: 8000
    - protocol: TCP
      port: 8001
  # Allow to other upstreams if needed (embeddings, reranker, etc.)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: llm-serving
    ports:
    - protocol: TCP
      port: 8080
  # Allow to atlas (riotpiao-backend) for /cluster/* routes
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: atlas
    ports:
    - protocol: TCP
      port: 8080