add coredns update

README.md

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+# Configuration Settings
+
+## Apply DNS Changes
+
+```bash
+kubectl apply -f k8s/
+# force dns reload
+kubectl delete pod --namespace kube-system --selector k8s-app=kube-dns
+```

k8s/coredns.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: coredns
+  namespace: kube-system
+data:
+  Corefile: |
+    .:53 {
+        errors
+        health
+        ready
+        kubernetes cluster.local in-addr.arpa ip6.arpa {
+          pods insecure
+          upstream
+          fallthrough in-addr.arpa ip6.arpa
+        }
+        hosts /etc/coredns/NodeHosts {
+          reload 1s
+          fallthrough
+        }
+        prometheus :9153
+        forward . /etc/resolv.conf
+        cache 30
+        loop
+        reload
+        loadbalance
+    }
+    ducoterra.net:53 {
+      forward . 3.14.3.100
+    }