Add DnsMasq (node local resolver) command-line arguments/options (#1528)

Small change confirmed through testing

Author: davidmccormick

core/controlplane/config/config.go

@@ -865,10 +865,11 @@ type KubeDnsAutoscaler struct {
 }
 
 type KubeDns struct {
-	Provider            string            `yaml:"provider"`
-	NodeLocalResolver   bool              `yaml:"nodeLocalResolver"`
-	DeployToControllers bool              `yaml:"deployToControllers"`
-	Autoscaler          KubeDnsAutoscaler `yaml:"autoscaler"`
+	Provider                 string            `yaml:"provider"`
+	NodeLocalResolver        bool              `yaml:"nodeLocalResolver"`
+	NodeLocalResolverOptions []string          `yaml:"nodeLocalResolverOptions"`
+	DeployToControllers      bool              `yaml:"deployToControllers"`
+	Autoscaler               KubeDnsAutoscaler `yaml:"autoscaler"`
 }
 
 func (c *KubeDns) MergeIfEmpty(other KubeDns) {

core/controlplane/config/templates/cloud-config-controller

@@ -3991,6 +3991,11 @@ write_files:
                 - --server=/in-addr.arpa/{{.DNSServiceIP}}
                 - --server=/ip6.arpa/{{.DNSServiceIP}}
                 - --log-facility=-
+                {{- if ne (len .KubeDns.NodeLocalResolverOptions) 0 }}
+                  {{- range .KubeDns.NodeLocalResolverOptions }}
+                - {{.}}
+                  {{- end }}
+                {{- end }}
                 ports:
                 - containerPort: 53
                   name: dns

core/root/config/templates/cluster.yaml

@@ -1363,6 +1363,10 @@ kubeDns:
   # When enabled, will enable a DNS-masq DaemonSet to make PODs to resolve DNS names via locally running dnsmasq
   # It is disabled by default.
   # nodeLocalResolver: false
+  # Extra DnsMasq options to use when running the nodeLocalResolver
+  # nodeLocalResolverOptions:
+  # - --neg-ttl=10
+  # - --no-ping
 
   # When enabled, will deploy kube-dns to K8s controllers instead of workers.
   # deployToControllers: false