external-secrets: NetworkPolicy, through a folder app of its own

apps/templates/external-secrets-folder.yaml

@@ -0,0 +1,19 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: external-secrets-folder
+  namespace: argocd
+  finalizers:
+  - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/rubenhensen/k8scd.git
+    targetRevision: HEAD
+    path: external-secrets
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: external-secrets
+  syncPolicy:
+    automated:
+      selfHeal: true

external-secrets/networkpolicy.yaml

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+# External Secrets' three pods reach each other, DNS and the API server
+# (the node, port 16443); the controller also reads Vault
+# (vault-active.vault.svc:8200, which vault/networkpolicy.yaml lets it
+# into). Besides their own namespace they take connections only from the
+# node: the API server calls the webhook from there and the kubelet probes
+# come from there too (10.1.7.64 is the node's Calico VXLAN address,
+# projectcalico.org/IPv4VXLANTunnelAddr). The Password generator behind
+# gatus/backup-check-token needs no network. The chart's Application
+# (apps/templates/external-secrets-helm.yaml) only installs the chart, so
+# this folder gets an Application of its own, external-secrets-folder.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default
+spec:
+  podSelector: {}
+  policyTypes:
+    - Ingress
+    - Egress
+  ingress:
+    - from:
+        - podSelector: {}
+    - from:
+        - ipBlock:
+            cidr: 192.168.1.204/32
+        - ipBlock:
+            cidr: 10.1.7.64/32
+  egress:
+    - to:
+        - podSelector: {}
+    - to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+          podSelector:
+            matchLabels:
+              k8s-app: kube-dns
+      ports:
+        - protocol: UDP
+          port: 53
+        - protocol: TCP
+          port: 53
+    - to:
+        - ipBlock:
+            cidr: 192.168.1.204/32
+      ports:
+        - port: 16443
+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: controller-to-vault
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: external-secrets
+  policyTypes:
+    - Egress
+  egress:
+    - to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: vault
+          podSelector:
+            matchLabels:
+              app.kubernetes.io/name: vault
+      ports:
+        - port: 8200