Deploy ns-externaldns BIND cluster

apps/base/ns-externaldns/cluster.yaml

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+---
+# external-dns tier (replaces the 3x Puppet external-dns servers). An ordinary
+# authoritative cluster; external-dns writes to its zones via RFC2136 because
+# those BindZones set dynamicUpdate (allow-update { key externaldns-key; }).
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindCluster
+metadata:
+  name: externaldns
+  namespace: ns-externaldns
+spec:
+  mode: authoritative
+  replicas: 3
+  storageClassName: cephrbd-fast-delete
+  storageSize: 1Gi
+  service:
+    type: LoadBalancer
+    annotations:
+      purelb.io/service-group: common
+      purelb.io/addresses: 198.18.200.8
+      external-dns.alpha.kubernetes.io/hostname: ns-externaldns.k8s.syd1.au.unkin.net
+  resources:
+    requests:
+      cpu: 100m
+      memory: 128Mi
+    limits:
+      cpu: "1"
+      memory: 512Mi

apps/base/ns-externaldns/kustomization.yaml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - tsigkey.yaml
+  - cluster.yaml

apps/base/ns-externaldns/namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ns-externaldns

apps/base/ns-externaldns/tsigkey.yaml

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+---
+# Key that external-dns (and DNSRecord objects) use to send RFC2136 dynamic
+# updates to the primary. The operator generates the material into a Secret.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindTSIGKey
+metadata:
+  name: externaldns-key
+  namespace: ns-externaldns
+spec:
+  algorithm: hmac-sha256