Add ExternalDNS configuration and setup script for Cloudflare integration

infrastructure_setup/externaldns/externaldns-rbac.yaml

@@ -0,0 +1,35 @@
+---
+# Common RBAC resources for all ExternalDNS deployments
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: external-dns
+  namespace: externaldns
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: external-dns
+rules:
+  - apiGroups: [""]
+    resources: ["services", "endpoints", "pods"]
+    verbs: ["get", "watch", "list"]
+  - apiGroups: ["extensions", "networking.k8s.io"]
+    resources: ["ingresses"]
+    verbs: ["get", "watch", "list"]
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["list"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: external-dns-viewer
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: external-dns
+subjects:
+  - kind: ServiceAccount
+    name: external-dns
+    namespace: externaldns