Refactor CoreDNS setup: add custom configuration and LoadBalancer service. This prevents k3s overwriting our config with a CoreDNS restart.

infrastructure_setup/coredns/coredns-custom-config.yaml

@@ -0,0 +1,24 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: coredns-custom
+  namespace: kube-system
+data:
+  # Custom server block for internal domains. All internal domains should
+  # resolve to the cluster proxy.
+  internal.server: |
+    internal.cloud.payne.io {
+      errors
+      cache 30
+      reload
+      template IN A {
+        match (.*)\.internal\.cloud\.payne\.io\.
+        answer "{{ .Name }} 60 IN A 192.168.8.240"
+      }
+    }
+  # Custom override to set external resolvers.
+  external.override: |
+    forward . 1.1.1.1 8.8.8.8 {
+      max_concurrent 1000
+    }