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 (monitoring namespace)
  # MUST select on kubernetes.io/metadata.name, not a plain `name:` label.
  # Only ingress-nginx carries a plain `name` label in this cluster; every
  # other namespace has just kubernetes.io/metadata.name, so `name: monitoring`
  # matched nothing and silently denied every Prometheus scrape of :8080
  # (surfaced as context-deadline-exceeded on all 3 gateway replicas while the
  # ServiceMonitor itself was discovered and healthy).
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: monitoring
    ports:
    - protocol: TCP
      port: 8080
  # Allow from poimen namespace (orchestrator & worker pods)
  # Enable Poimen workflows to call the LLM API gateway
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: poimen
    ports:
    - protocol: TCP
      port: 8080
  # Allow from portfolio namespace (riotpiao.com chat terminal)
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: portfolio
    ports:
    - protocol: TCP
      port: 8080
  # Allow from paperless namespace (paperless-ai document auto-tagging)
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: paperless
    ports:
    - protocol: TCP
      port: 8080
  egress:
  # 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
  # Allow to IAM (Zitadel) for JWKS fetch + API
  # Zitadel API listens on 8080 (h2c/plaintext in-cluster); the login UI
  # listens on 3000. Public access goes through ingress-nginx on 443 (already
  # covered by the 10.96.0.0/12 CIDR below), but 8080 keeps direct in-cluster
  # calls working if CoreDNS rewrite is bypassed.
  # NetworkPolicy matches destination pod port, not service port.
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: iam
    ports:
    - protocol: TCP
      port: 8080
    - protocol: TCP
      port: 3000
  # Allow to SQS (queue management service)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: sqs
    ports:
    - protocol: TCP
      port: 9090
  # Allow to Temporal (workflow engine gRPC)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: temporal
    ports:
    - protocol: TCP
      port: 7233
  # Allow to Poimen (memory:8080 + graphql:8090 + redis:6379 + fleet-controller:8788)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: poimen
    ports:
    - protocol: TCP
      port: 8080
    - protocol: TCP
      port: 8090
    - protocol: TCP
      port: 6379
    - protocol: TCP
      port: 8788
  # Allow to Gotify (push notifications)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: notifications
    ports:
    - protocol: TCP
      port: 80
  # Allow to MinIO (S3-compatible storage)
  # Service `minio` listens on port 80 (targetPort 9000).
  # Headless `minio-cluster-hl` is 9000. Allow both.
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: storage
    ports:
    - protocol: TCP
      port: 80
    - protocol: TCP
      port: 9000
  # Allow to Forgejo registry v2 API (image digest lookup for promotion)
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: cicd
    ports:
    - protocol: TCP
      port: 3000
  # Allow to kubernetes API server (ArgoCD Application patching via in-cluster SA).
  # kube-apiserver runs on host network (192.168.1.162/166:6443) — must use ipBlock.
  # ClusterIP 10.96.0.1:443 also routes there, covered by the 10.96.0.0/12 CIDR.
  - to:
    - ipBlock:
        cidr: 10.96.0.0/12
    - ipBlock:
        cidr: 192.168.1.0/24
    ports:
    - protocol: TCP
      port: 443
    - protocol: TCP
      port: 6443