Add validations to make kube-node-label.service not to fail at run time

core/controlplane/config/config.go

@@ -848,6 +848,15 @@ func (c Cluster) valid() error {
 		return fmt.Errorf("selected worker tenancy (%s) is incompatible with spot instances", c.WorkerTenancy)
 	}
 
+	clusterNamePlaceholder := "<my-cluster-name>"
+	nestedStackNamePlaceHolder := "<my-nested-stack-name>"
+	replacer := strings.NewReplacer(clusterNamePlaceholder, "", nestedStackNamePlaceHolder, "")
+	simulatedLcName := fmt.Sprintf("%s-%s-1N2C4K3LLBEDZ-%sLC-BC2S9P3JG2QD", clusterNamePlaceholder, nestedStackNamePlaceHolder, c.Controller.LogicalName())
+	limit := 63 - len(replacer.Replace(simulatedLcName))
+	if c.Experimental.AwsNodeLabels.Enabled && len(c.ClusterName) > limit {
+		return fmt.Errorf("awsNodeLabels can't be enabled for controllers because the total number of characters in clusterName(=\"%s\") exceeds the limit of %d", c.ClusterName, limit)
+	}
+
 	return nil
 }
 

core/nodepool/config/config.go

@@ -253,6 +253,15 @@ func (c ProvidedConfig) valid() error {
 		return err
 	}
 
+	clusterNamePlaceholder := "<my-cluster-name>"
+	nestedStackNamePlaceHolder := "<my-nested-stack-name>"
+	replacer := strings.NewReplacer(clusterNamePlaceholder, "", nestedStackNamePlaceHolder, "")
+	simulatedLcName := fmt.Sprintf("%s-%s-1N2C4K3LLBEDZ-%sLC-BC2S9P3JG2QD", clusterNamePlaceholder, nestedStackNamePlaceHolder, c.LogicalName())
+	limit := 63 - len(replacer.Replace(simulatedLcName))
+	if c.Experimental.AwsNodeLabels.Enabled && len(c.ClusterName+c.NodePoolName) > limit {
+		return fmt.Errorf("awsNodeLabels can't be enabled for node pool because the total number of characters in clusterName(=\"%s\") + node pool's name(=\"%s\") exceeds the limit of %d", c.ClusterName, c.NodePoolName, limit)
+	}
+
 	return nil
 }
 

test/integration/maincluster_test.go

@@ -1914,6 +1914,34 @@ worker:
 `,
 			expectedErrorMessage: "Effect must be NoSchdule or PreferNoSchedule, but was UnknownEffect",
 		},
+		{
+			context: "WithAwsNodeLabelEnabledForTooLongClusterNameAndPoolName",
+			configYaml: minimalValidConfigYaml + `
+# clusterName + nodePools[].name should be less than or equal to 25 characters or the launch configuration name
+# "mykubeawsclustername-mynestedstackname-1N2C4K3LLBEDZ-ControllersLC-BC2S9P3JG2QD" exceeds the limit of 63 characters
+# See https://kubernetes.io/docs/user-guide/labels/#syntax-and-character-set
+clusterName: my_cluster1 # 11 characters
+worker:
+  nodePools:
+  - name: workernodepool1 # 15 characters
+    awsNodeLabels:
+      enabled: true
+`,
+			expectedErrorMessage: "awsNodeLabels can't be enabled for node pool because the total number of characters in clusterName(=\"my_cluster1\") + node pool's name(=\"workernodepool1\") exceeds the limit of 25",
+		},
+		{
+			context: "WithAwsNodeLabelEnabledForTooLongClusterName",
+			configYaml: minimalValidConfigYaml + `
+# clusterName should be less than or equal to 21 characters or the launch configuration name
+# "mykubeawsclustername-mynestedstackname-1N2C4K3LLBEDZ-ControllersLC-BC2S9P3JG2QD" exceeds the limit of 63 characters
+# See https://kubernetes.io/docs/user-guide/labels/#syntax-and-character-set
+clusterName: my_long_long_cluster_1 # 22 characters
+experimental:
+  awsNodeLabels:
+     enabled: true
+`,
+			expectedErrorMessage: "awsNodeLabels can't be enabled for controllers because the total number of characters in clusterName(=\"my_long_long_cluster_1\") exceeds the limit of 21",
+		},
 		{
 			context: "WithNonZeroWorkerCount",
 			configYaml: minimalValidConfigYaml + `