add validation error for maxpods limitation

Author: TiberiuGC

pkg/apis/eksctl.io/v1alpha5/validation.go

@@ -1187,6 +1187,10 @@ func ValidateManagedNodeGroup(index int, ng *ManagedNodeGroup) error {
 		}
 	}
 
+	if ng.AMIFamily == NodeImageFamilyAmazonLinux2023 && ng.MaxPodsPerNode > 0 {
+		return errors.Errorf("eksctl does not support configuring maxPodsPerNode EKS-managed nodes based on %s", NodeImageFamilyAmazonLinux2023)
+	}
+
 	if ng.AMIFamily == NodeImageFamilyBottlerocket {
 		fieldNotSupported := func(field string) error {
 			return &unsupportedFieldError{

pkg/apis/eksctl.io/v1alpha5/validation_test.go

@@ -2092,6 +2092,16 @@ var _ = Describe("ClusterConfig validation", func() {
 		})
 	})
 
+	Describe("AmazonLinux2023 node groups", func() {
+		It("returns an error when setting maxPodsPerNode for managed nodegroups", func() {
+			ng := api.NewManagedNodeGroup()
+			ng.AMIFamily = api.NodeImageFamilyAmazonLinux2023
+			ng.MaxPodsPerNode = 5
+			err := api.ValidateManagedNodeGroup(0, ng)
+			Expect(err).To(MatchError(ContainSubstring("eksctl does not support configuring maxPodsPerNode EKS-managed nodes")))
+		})
+	})
+
 	Describe("Windows node groups", func() {
 		It("returns an error with unsupported fields", func() {
 			doc := api.InlineDocument{