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Addresses the #1 finding from the 2026-02-19 security audit: zero NetworkPolicies across 19 namespaces (flat network). This PR adds 29 Cilium network policies: - 6 default-deny ingress policies (database, security, home-automation, selfhosted, ai, roundtable) - 5 cluster-wide policies (DNS, ingress controllers, Prometheus scraping) - 18 app-specific allow policies mapping actual traffic flows Architecture: - Default deny on high-value namespaces (databases, secrets, AI) - Explicit allow rules based on actual dependency mapping - CiliumClusterwideNetworkPolicy for cross-cutting concerns - Namespace-scoped CiliumNetworkPolicy for app-specific rules - Separate Flux Kustomization (cilium-network-policies) with Cilium dependency Namespaces covered: database, security, home-automation, selfhosted, ai, roundtable Not yet covered (lower risk): media, observability, kube-system, cert-manager⚠️ DEPLOY NOTE: Review policies before merging. Default-deny policies will break traffic that isn't explicitly allowed. Recommend deploying one namespace at a time and monitoring with Hubble.
Added: - default-deny-media: isolate *arr apps, Plex, Sabnzbd - default-deny-observability: isolate Grafana, Loki, Prometheus - allow-media-apps: autobrr→postgres, media apps→external (indexers/usenet) - allow-observability-apps: grafana→postgres/loki/prometheus, alertmanager→external (notifications), gatus→health checks Now covers ALL application namespaces: ai, database, home-automation, media, observability, roundtable, security, selfhosted (8/8)
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