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skills/k8s-security-policies/assets/network-policy-template.yaml

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+# Network Policy Templates
+
+---
+# Template 1: Default Deny All (Start Here)
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default-deny-all
+  namespace: <namespace>
+spec:
+  podSelector: {}
+  policyTypes:
+  - Ingress
+  - Egress
+
+---
+# Template 2: Allow DNS (Essential)
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-dns
+  namespace: <namespace>
+spec:
+  podSelector: {}
+  policyTypes:
+  - Egress
+  egress:
+  - to:
+    - namespaceSelector:
+        matchLabels:
+          name: kube-system
+    ports:
+    - protocol: UDP
+      port: 53
+
+---
+# Template 3: Frontend to Backend
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-frontend-to-backend
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      app: backend
+      tier: backend
+  policyTypes:
+  - Ingress
+  ingress:
+  - from:
+    - podSelector:
+        matchLabels:
+          app: frontend
+          tier: frontend
+    ports:
+    - protocol: TCP
+      port: 8080
+    - protocol: TCP
+      port: 9090
+
+---
+# Template 4: Allow Ingress Controller
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-ingress-controller
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      app: web
+  policyTypes:
+  - Ingress
+  ingress:
+  - from:
+    - namespaceSelector:
+        matchLabels:
+          name: ingress-nginx
+    ports:
+    - protocol: TCP
+      port: 80
+    - protocol: TCP
+      port: 443
+
+---
+# Template 5: Allow Monitoring (Prometheus)
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-prometheus-scraping
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      prometheus.io/scrape: "true"
+  policyTypes:
+  - Ingress
+  ingress:
+  - from:
+    - namespaceSelector:
+        matchLabels:
+          name: monitoring
+    ports:
+    - protocol: TCP
+      port: 9090
+
+---
+# Template 6: Allow External HTTPS
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-external-https
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      app: api-client
+  policyTypes:
+  - Egress
+  egress:
+  - to:
+    - ipBlock:
+        cidr: 0.0.0.0/0
+        except:
+        - 169.254.169.254/32  # Block metadata service
+    ports:
+    - protocol: TCP
+      port: 443
+
+---
+# Template 7: Database Access
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-app-to-database
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      app: postgres
+      tier: database
+  policyTypes:
+  - Ingress
+  ingress:
+  - from:
+    - podSelector:
+        matchLabels:
+          tier: backend
+    ports:
+    - protocol: TCP
+      port: 5432
+
+---
+# Template 8: Cross-Namespace Communication
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-from-prod-namespace
+  namespace: <namespace>
+spec:
+  podSelector:
+    matchLabels:
+      app: api
+  policyTypes:
+  - Ingress
+  ingress:
+  - from:
+    - namespaceSelector:
+        matchLabels:
+          environment: production
+      podSelector:
+        matchLabels:
+          app: frontend
+    ports:
+    - protocol: TCP
+      port: 8080