Add ExternalDNS configuration and setup script for Cloudflare integration

infrastructure_setup/externaldns/README.md

@@ -0,0 +1,14 @@
+# External DNS
+
+See: https://github.com/kubernetes-sigs/external-dns
+
+ExternalDNS allows you to keep selected zones (via --domain-filter) synchronized with Ingresses and Services of type=LoadBalancer and nodes in various DNS providers.
+
+Currently, we are only configured to use CloudFlare.
+
+Docs: https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/cloudflare.md
+
+Any Ingress that has metatdata.annotions with
+external-dns.alpha.kubernetes.io/hostname: `<something>.${DOMAIN}`
+
+will have Cloudflare records created by External DNS.

infrastructure_setup/externaldns/externaldns-cloudflare.yaml

@@ -1,38 +1,5 @@
 ---
-apiVersion: v1
+# CloudFlare provider for ExternalDNS
-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
----
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -56,14 +23,17 @@ spec:
           args:
             - --source=service
             - --source=ingress
-            - --provider=cloudflare
             - --txt-owner-id=${OWNER_ID}
-            - --log-level=debug
+            - --provider=cloudflare
+            - --domain-filter=${DOMAIN}
+            #- --exclude-domains=internal.${DOMAIN}
+            - --cloudflare-dns-records-per-page=5000
             - --publish-internal-services
             - --no-cloudflare-proxied
+            - --log-level=debug
           env:
             - name: CF_API_TOKEN
               valueFrom:
                 secretKeyRef:
                   name: cloudflare-api-token
-                  key: api-token
+                  key: api-token

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

infrastructure_setup/setup-externaldns.sh

@@ -28,16 +28,24 @@ else
   exit 1
 fi
 
+# Apply common RBAC resources
+echo "Deploying ExternalDNS RBAC resources..."
+cat ${SCRIPT_DIR}/externaldns/externaldns-rbac.yaml | envsubst | kubectl apply -f -
+
 # Apply ExternalDNS manifests with environment variables
-echo "Deploying ExternalDNS..."
+echo "Deploying ExternalDNS for external DNS (Cloudflare)..."
-cat ${SCRIPT_DIR}/externaldns/externaldns.yaml | envsubst | kubectl apply -f -
+cat ${SCRIPT_DIR}/externaldns/externaldns-cloudflare.yaml | envsubst | kubectl apply -f -
 
 # Wait for ExternalDNS to be ready
-echo "Waiting for ExternalDNS to be ready..."
+echo "Waiting for Cloudflare ExternalDNS to be ready..."
 kubectl rollout status deployment/external-dns -n externaldns --timeout=60s
 
+# echo "Waiting for CoreDNS ExternalDNS to be ready..."
+# kubectl rollout status deployment/external-dns-coredns -n externaldns --timeout=60s
+
 echo "ExternalDNS setup complete!"
 echo ""
 echo "To verify the installation:"
 echo "  kubectl get pods -n externaldns"
 echo "  kubectl logs -n externaldns -l app=external-dns -f"
+echo "  kubectl logs -n externaldns -l app=external-dns-coredns -f"