⚠️ remove DNS type from v1alpha4

bootstrap/kubeadm/api/v1alpha3/conversion.go

@@ -19,6 +19,7 @@ package v1alpha3
 import (
 	apiconversion "k8s.io/apimachinery/pkg/conversion"
 	kubeadmbootstrapv1alpha4 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1alpha4"
+	kubeadmbootstrapv1beta1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/types/v1beta1"
 	"sigs.k8s.io/controller-runtime/pkg/conversion"
 )
 
@@ -75,3 +76,14 @@ func Convert_v1alpha3_KubeadmConfigStatus_To_v1alpha4_KubeadmConfigStatus(in *Ku
 	// KubeadmConfigStatus.BootstrapData has been removed in v1alpha4 because its content has been moved to the bootstrap data secret, value will be lost during conversion.
 	return autoConvert_v1alpha3_KubeadmConfigStatus_To_v1alpha4_KubeadmConfigStatus(in, out, s)
 }
+
+func Convert_v1alpha4_ClusterConfiguration_To_v1beta1_ClusterConfiguration(in *kubeadmbootstrapv1alpha4.ClusterConfiguration, out *kubeadmbootstrapv1beta1.ClusterConfiguration, s apiconversion.Scope) error {
+	// DNS.Type was removed in v1alpha4 because only CoreDNS is supported; the information will be left to empty (kubeadm defaults it to CoredDNS);
+	// Existing clusters using kube-dns or other DNS solutions will continue to be managed/supported via the skip-coredns annotation.
+	return kubeadmbootstrapv1beta1.Convert_v1alpha4_ClusterConfiguration_To_v1beta1_ClusterConfiguration(in, out, s)
+}
+
+func Convert_v1beta1_ClusterConfiguration_To_v1alpha4_ClusterConfiguration(in *kubeadmbootstrapv1beta1.ClusterConfiguration, out *kubeadmbootstrapv1alpha4.ClusterConfiguration, s apiconversion.Scope) error {
+	// DNS.Type was removed in v1alpha4 because only CoreDNS is supported, dropping this info.
+	return kubeadmbootstrapv1beta1.Convert_v1beta1_ClusterConfiguration_To_v1alpha4_ClusterConfiguration(in, out, s)
+}

bootstrap/kubeadm/api/v1alpha3/conversion_test.go

@@ -26,6 +26,7 @@ import (
 
 	"k8s.io/apimachinery/pkg/runtime"
 	"sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1alpha4"
+	"sigs.k8s.io/cluster-api/bootstrap/kubeadm/types/v1beta1"
 	utilconversion "sigs.k8s.io/cluster-api/util/conversion"
 )
 
@@ -42,15 +43,17 @@ func TestFuzzyConversion(t *testing.T) {
 		FuzzerFuncs: []fuzzer.FuzzerFuncs{KubeadmConfigStatusFuzzFuncs},
 	}))
 	t.Run("for KubeadmConfigTemplate", utilconversion.FuzzTestFunc(utilconversion.FuzzTestFuncInput{
-		Scheme: scheme,
-		Hub:    &v1alpha4.KubeadmConfigTemplate{},
-		Spoke:  &KubeadmConfigTemplate{},
+		Scheme:      scheme,
+		Hub:         &v1alpha4.KubeadmConfigTemplate{},
+		Spoke:       &KubeadmConfigTemplate{},
+		FuzzerFuncs: []fuzzer.FuzzerFuncs{KubeadmConfigStatusFuzzFuncs},
 	}))
 }
 
 func KubeadmConfigStatusFuzzFuncs(_ runtimeserializer.CodecFactory) []interface{} {
 	return []interface{}{
 		KubeadmConfigStatusFuzzer,
+		dnsFuzzer,
 	}
 }
 
@@ -60,3 +63,10 @@ func KubeadmConfigStatusFuzzer(obj *KubeadmConfigStatus, c fuzz.Continue) {
 	// KubeadmConfigStatus.BootstrapData has been removed in v1alpha4, so setting it to nil in order to avoid v1alpha3 --> v1alpha4 --> v1alpha3 round trip errors.
 	obj.BootstrapData = nil
 }
+
+func dnsFuzzer(obj *v1beta1.DNS, c fuzz.Continue) {
+	c.FuzzNoCustom(obj)
+
+	// DNS.Type does not exists in v1alpha4, so setting it to empty string in order to avoid v1alpha3 --> v1alpha4 --> v1alpha3 round trip errors.
+	obj.Type = ""
+}

bootstrap/kubeadm/api/v1alpha4/kubeadm_types.go

@@ -167,10 +167,6 @@ const (
 
 // DNS defines the DNS addon that should be used in the cluster.
 type DNS struct {
-	// Type defines the DNS add-on to be used
-	// +optional
-	Type DNSAddOnType `json:"type,omitempty"`
-
 	// ImageMeta allows to customize the image used for the DNS component
 	ImageMeta `json:",inline"`
 }

bootstrap/kubeadm/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigs.yaml

@@ -834,9 +834,6 @@ spec:
                       imageTag:
                         description: ImageTag allows to specify a tag for the image. In case this value is set, kubeadm does not change automatically the version of the above components during upgrades.
                         type: string
-                      type:
-                        description: Type defines the DNS add-on to be used
-                        type: string
                     type: object
                   etcd:
                     description: 'Etcd holds configuration for etcd. NB: This value defaults to a Local (stacked) etcd'

bootstrap/kubeadm/config/crd/bases/bootstrap.cluster.x-k8s.io_kubeadmconfigtemplates.yaml

@@ -795,9 +795,6 @@ spec:
                               imageTag:
                                 description: ImageTag allows to specify a tag for the image. In case this value is set, kubeadm does not change automatically the version of the above components during upgrades.
                                 type: string
-                              type:
-                                description: Type defines the DNS add-on to be used
-                                type: string
                             type: object
                           etcd:
                             description: 'Etcd holds configuration for etcd. NB: This value defaults to a Local (stacked) etcd'

bootstrap/kubeadm/types/v1beta1/conversion.go

@@ -17,6 +17,7 @@ limitations under the License.
 package v1beta1
 
 import (
+	apimachineryconversion "k8s.io/apimachinery/pkg/conversion"
 	bootstrapv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1alpha4"
 	"sigs.k8s.io/controller-runtime/pkg/conversion"
 )
@@ -68,3 +69,8 @@ func (dst *JoinConfiguration) ConvertFrom(srcRaw conversion.Hub) error {
 	src := srcRaw.(*bootstrapv1.JoinConfiguration)
 	return Convert_v1alpha4_JoinConfiguration_To_v1beta1_JoinConfiguration(src, dst, nil)
 }
+
+func Convert_v1beta1_DNS_To_v1alpha4_DNS(in *DNS, out *bootstrapv1.DNS, s apimachineryconversion.Scope) error {
+	// DNS.Type was removed in v1alpha4 because only CoreDNS is supported, dropping this info.
+	return autoConvert_v1beta1_DNS_To_v1alpha4_DNS(in, out, s)
+}

bootstrap/kubeadm/types/v1beta1/conversion_test.go

@@ -19,8 +19,11 @@ package v1beta1
 import (
 	"testing"
 
+	fuzz "github.com/google/gofuzz"
 	. "github.com/onsi/gomega"
+	"k8s.io/apimachinery/pkg/api/apitesting/fuzzer"
 	"k8s.io/apimachinery/pkg/runtime"
+	runtimeserializer "k8s.io/apimachinery/pkg/runtime/serializer"
 	"sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1alpha4"
 	utilconversion "sigs.k8s.io/cluster-api/util/conversion"
 )
@@ -37,26 +40,43 @@ func TestFuzzyConversion(t *testing.T) {
 		Spoke:  &ClusterConfiguration{},
 		// NOTE: Kubeadm types does not have ObjectMeta, so we are required to skip data annotation cleanup in the spoke-hub-spoke round trip test.
 		SkipSpokeAnnotationCleanup: true,
+		FuzzerFuncs:                []fuzzer.FuzzerFuncs{fuzzFuncs},
 	}))
 	t.Run("for ClusterStatus", utilconversion.FuzzTestFunc(utilconversion.FuzzTestFuncInput{
 		Scheme: scheme,
 		Hub:    &v1alpha4.ClusterStatus{},
 		Spoke:  &ClusterStatus{},
 		// NOTE: Kubeadm types does not have ObjectMeta, so we are required to skip data annotation cleanup in the spoke-hub-spoke round trip test.
 		SkipSpokeAnnotationCleanup: true,
+		FuzzerFuncs:                []fuzzer.FuzzerFuncs{fuzzFuncs},
 	}))
 	t.Run("for InitConfiguration", utilconversion.FuzzTestFunc(utilconversion.FuzzTestFuncInput{
 		Scheme: scheme,
 		Hub:    &v1alpha4.InitConfiguration{},
 		Spoke:  &InitConfiguration{},
 		// NOTE: Kubeadm types does not have ObjectMeta, so we are required to skip data annotation cleanup in the spoke-hub-spoke round trip test.
 		SkipSpokeAnnotationCleanup: true,
+		FuzzerFuncs:                []fuzzer.FuzzerFuncs{fuzzFuncs},
 	}))
 	t.Run("for JoinConfiguration", utilconversion.FuzzTestFunc(utilconversion.FuzzTestFuncInput{
 		Scheme: scheme,
 		Hub:    &v1alpha4.JoinConfiguration{},
 		Spoke:  &JoinConfiguration{},
 		// NOTE: Kubeadm types does not have ObjectMeta, so we are required to skip data annotation cleanup in the spoke-hub-spoke round trip test.
 		SkipSpokeAnnotationCleanup: true,
+		FuzzerFuncs:                []fuzzer.FuzzerFuncs{fuzzFuncs},
 	}))
 }
+
+func fuzzFuncs(_ runtimeserializer.CodecFactory) []interface{} {
+	return []interface{}{
+		dnsFuzzer,
+	}
+}
+
+func dnsFuzzer(obj *DNS, c fuzz.Continue) {
+	c.FuzzNoCustom(obj)
+
+	// DNS.Type does not exists in v1alpha4, so setting it to empty string in order to avoid v1beta1 --> v1alpha4 --> v1beta1 round trip errors.
+	obj.Type = ""
+}

bootstrap/kubeadm/types/v1beta2/conversion.go

@@ -84,3 +84,8 @@ func Convert_v1beta2_JoinControlPlane_To_v1alpha4_JoinControlPlane(in *JoinContr
 	// JoinControlPlane.CertificateKey exists in v1beta2 types but not in bootstrapv1.JoinControlPlane (Cluster API does not uses automatic copy certs). Ignoring when converting.
 	return autoConvert_v1beta2_JoinControlPlane_To_v1alpha4_JoinControlPlane(in, out, s)
 }
+
+func Convert_v1beta2_DNS_To_v1alpha4_DNS(in *DNS, out *bootstrapv1.DNS, s apimachineryconversion.Scope) error {
+	// DNS.Type was removed in v1alpha4 because only CoreDNS is supported, dropping this info.
+	return autoConvert_v1beta2_DNS_To_v1alpha4_DNS(in, out, s)
+}

bootstrap/kubeadm/types/v1beta2/conversion_test.go

@@ -74,6 +74,7 @@ func fuzzFuncs(_ runtimeserializer.CodecFactory) []interface{} {
 		nodeRegistrationOptionsFuzzer,
 		initConfigurationFuzzer,
 		joinControlPlanesFuzzer,
+		dnsFuzzer,
 	}
 }
 
@@ -97,3 +98,10 @@ func initConfigurationFuzzer(obj *InitConfiguration, c fuzz.Continue) {
 	// InitConfiguration.CertificateKey does not exists in v1alpha4, so setting it to empty string in order to avoid v1beta2 --> v1alpha4 --> v1beta2 round trip errors.
 	obj.CertificateKey = ""
 }
+
+func dnsFuzzer(obj *DNS, c fuzz.Continue) {
+	c.FuzzNoCustom(obj)
+
+	// DNS.Type does not exists in v1alpha4, so setting it to empty string in order to avoid v1beta2 --> v1alpha4 --> v1beta2 round trip errors.
+	obj.Type = ""
+}

controlplane/kubeadm/api/v1alpha3/conversion_test.go

@@ -59,6 +59,7 @@ func fuzzFuncs(_ runtimeserializer.CodecFactory) []interface{} {
 	return []interface{}{
 		kubeadmBootstrapTokenStringFuzzer,
 		cabpkBootstrapTokenStringFuzzer,
+		dnsFuzzer,
 	}
 }
 
@@ -70,3 +71,10 @@ func cabpkBootstrapTokenStringFuzzer(in *cabpkv1.BootstrapTokenString, c fuzz.Co
 	in.ID = "abcdef"
 	in.Secret = "abcdef0123456789"
 }
+
+func dnsFuzzer(obj *kubeadmv1beta1.DNS, c fuzz.Continue) {
+	c.FuzzNoCustom(obj)
+
+	// DNS.Type does not exists in v1alpha4, so setting it to empty string in order to avoid v1alpha3 --> v1alpha4 --> v1alpha3 round trip errors.
+	obj.Type = ""
+}