Fix Karpenter failure to start on IPv6 clusters

tests/integration/update_cluster/karpenter/data/aws_s3_object_minimal.example.com-addons-bootstrap_content

@@ -14,7 +14,7 @@ spec:
     version: 9.99.0
   - id: k8s-1.12
     manifest: coredns.addons.k8s.io/k8s-1.12.yaml
-    manifestHash: d2bbb7cbee5835c3891fe80fbacf8963508359ef9159f8480325ce9a7174f14a
+    manifestHash: 8834e41010ae2fb8a533107c4a32cf068ac161359956e7a52921b2a07ad8ebf5
     name: coredns.addons.k8s.io
     selector:
       k8s-addon: coredns.addons.k8s.io
@@ -69,7 +69,7 @@ spec:
     version: 9.99.0
   - id: k8s-1.19
     manifest: karpenter.sh/k8s-1.19.yaml
-    manifestHash: f59d4c21751b3fc33c84e664fb41199b8efb58cc5976ade6e937abc109cb612b
+    manifestHash: aab89cad4f4a52b8620f581548694a6fc096bdbd1a297310beda01b57d3550ae
     name: karpenter.sh
     prune:
       kinds:

tests/integration/update_cluster/karpenter/data/aws_s3_object_minimal.example.com-addons-coredns.addons.k8s.io-k8s-1.12_content

@@ -188,6 +188,10 @@ spec:
       tolerations:
       - key: CriticalAddonsOnly
         operator: Exists
+      - key: node-role.kubernetes.io/master
+        operator: Exists
+      - key: node-role.kubernetes.io/control-plane
+        operator: Exists
       topologySpreadConstraints:
       - labelSelector:
           matchLabels:

tests/integration/update_cluster/karpenter/data/aws_s3_object_minimal.example.com-addons-karpenter.sh-k8s-1.19_content

@@ -1752,7 +1752,7 @@ spec:
         - mountPath: /var/run/secrets/amazonaws.com/
           name: token-amazonaws-com
           readOnly: true
-      dnsPolicy: Default
+      dnsPolicy: ClusterFirst
       priorityClassName: system-cluster-critical
       securityContext:
         fsGroup: 1000

upup/models/cloudup/resources/addons/coredns.addons.k8s.io/k8s-1.12.yaml.template

@@ -132,6 +132,12 @@ spec:
         - key: "CriticalAddonsOnly"
           operator: "Exists"
         {{- end }}
+        {{- if KarpenterEnabled }}
+        - key: node-role.kubernetes.io/master
+          operator: Exists
+        - key: node-role.kubernetes.io/control-plane
+          operator: Exists
+        {{- end }}
       nodeSelector:
         kubernetes.io/os: linux
 {{- if .KubeDNS.Affinity }}

upup/models/cloudup/resources/addons/karpenter.sh/k8s-1.19.yaml.template

@@ -1478,7 +1478,8 @@ spec:
       securityContext:
         fsGroup: 1000
       priorityClassName: "system-cluster-critical"
-      dnsPolicy: Default
+      # Must use ClusterFirst on IPv6 clusters in order to get DNS64
+      dnsPolicy: ClusterFirst
       containers:
         - name: controller
           image: public.ecr.aws/karpenter/controller:v0.28.1

upup/pkg/fi/cloudup/bootstrapchannelbuilder/bootstrapchannelbuilder.go

@@ -1226,7 +1226,7 @@ func (b *BootstrapChannelBuilder) buildAddons(c *fi.CloudupModelBuilderContext)
 			})
 		}
 	}
-	if b.Cluster.Spec.Karpenter != nil && fi.ValueOf(&b.Cluster.Spec.Karpenter.Enabled) {
+	if b.Cluster.Spec.Karpenter != nil && b.Cluster.Spec.Karpenter.Enabled {
 		key := "karpenter.sh"
 
 		{

upup/pkg/fi/cloudup/template_functions.go

@@ -381,6 +381,9 @@ func (tf *TemplateFunctions) AddTo(dest template.FuncMap, secretStore fi.SecretS
 		return nodeup.UsesInstanceIDForNodeName(tf.Cluster)
 	}
 
+	dest["KarpenterEnabled"] = func() bool {
+		return cluster.Spec.Karpenter != nil && cluster.Spec.Karpenter.Enabled
+	}
 	dest["KarpenterInstanceTypes"] = func(ig kops.InstanceGroupSpec) ([]string, error) {
 		return karpenterInstanceTypes(tf.cloud.(awsup.AWSCloud), ig)
 	}