Add DisableExtensionOperations field

api/v1beta1/azuremachine_types.go

@@ -132,6 +132,12 @@ type AzureMachineSpec struct {
 	// +optional
 	DNSServers []string `json:"dnsServers,omitempty"`
 
+	// DisableExtensionOperations specifies whether extension operations should be disabled on the virtual machine.
+	// Use this setting only if VMExtensions are not supported by your image, as it disables CAPZ bootstrapping extension used for detecting Kubernetes bootstrap failure.
+	// This may only be set to True when no extensions are configured on the virtual machine.
+	// +optional
+	DisableExtensionOperations *bool `json:"disableExtensionOperations,omitempty"`
+
 	// VMExtensions specifies a list of extensions to be added to the virtual machine.
 	// +optional
 	VMExtensions []VMExtension `json:"vmExtensions,omitempty"`

api/v1beta1/azuremachine_validation.go

@@ -24,6 +24,7 @@ import (
 	"github.com/google/uuid"
 	"golang.org/x/crypto/ssh"
 	"k8s.io/apimachinery/pkg/util/validation/field"
+	"k8s.io/utils/ptr"
 	azureutil "sigs.k8s.io/cluster-api-provider-azure/util/azure"
 )
 
@@ -71,6 +72,10 @@ func ValidateAzureMachineSpec(spec AzureMachineSpec) field.ErrorList {
 		allErrs = append(allErrs, errs...)
 	}
 
+	if errs := ValidateVMExtensions(spec.DisableExtensionOperations, spec.VMExtensions, field.NewPath("vmExtensions")); len(errs) > 0 {
+		allErrs = append(allErrs, errs...)
+	}
+
 	return allErrs
 }
 
@@ -471,3 +476,14 @@ func ValidateCapacityReservationGroupID(capacityReservationGroupID *string, fldP
 
 	return allErrs
 }
+
+// ValidateVMExtensions validates the VMExtensions spec.
+func ValidateVMExtensions(disableExtensionOperations *bool, vmExtensions []VMExtension, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+
+	if ptr.Deref(disableExtensionOperations, false) && len(vmExtensions) > 0 {
+		allErrs = append(allErrs, field.Forbidden(field.NewPath("AzureMachineTemplate", "spec", "template", "spec", "VMExtensions"), "VMExtensions must be empty when DisableExtensionOperations is true"))
+	}
+
+	return allErrs
+}

api/v1beta1/azuremachine_webhook.go

@@ -213,6 +213,13 @@ func (mw *azureMachineWebhook) ValidateUpdate(ctx context.Context, oldObj, newOb
 		allErrs = append(allErrs, err)
 	}
 
+	if err := webhookutils.ValidateImmutable(
+		field.NewPath("spec", "disableExtensionOperations"),
+		old.Spec.DisableExtensionOperations,
+		m.Spec.DisableExtensionOperations); err != nil {
+		allErrs = append(allErrs, err)
+	}
+
 	if len(allErrs) == 0 {
 		return nil, nil
 	}

api/v1beta1/azuremachine_webhook_test.go

@@ -230,6 +230,16 @@ func TestAzureMachine_ValidateCreate(t *testing.T) {
 			machine: createMachineWithCapacityReservaionGroupID("invalid-capacity-group-id"),
 			wantErr: true,
 		},
+		{
+			name:    "azuremachine with DisableExtensionOperations true and without VMExtensions",
+			machine: createMachineWithDisableExtenionOperations(),
+			wantErr: false,
+		},
+		{
+			name:    "azuremachine with DisableExtensionOperations true and with VMExtension",
+			machine: createMachineWithDisableExtenionOperationsAndHasExtension(),
+			wantErr: true,
+		},
 	}
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {
@@ -778,6 +788,34 @@ func TestAzureMachine_ValidateUpdate(t *testing.T) {
 			},
 			wantErr: true,
 		},
+		{
+			name: "invalidTest: azuremachine.spec.disableExtensionOperations is immutable",
+			oldMachine: &AzureMachine{
+				Spec: AzureMachineSpec{
+					DisableExtensionOperations: ptr.To(true),
+				},
+			},
+			newMachine: &AzureMachine{
+				Spec: AzureMachineSpec{
+					DisableExtensionOperations: ptr.To(false),
+				},
+			},
+			wantErr: true,
+		},
+		{
+			name: "validTest: azuremachine.spec.disableExtensionOperations is immutable",
+			oldMachine: &AzureMachine{
+				Spec: AzureMachineSpec{
+					DisableExtensionOperations: ptr.To(true),
+				},
+			},
+			newMachine: &AzureMachine{
+				Spec: AzureMachineSpec{
+					DisableExtensionOperations: ptr.To(true),
+				},
+			},
+			wantErr: false,
+		},
 		{
 			name: "validTest: azuremachine.spec.networkInterfaces is immutable",
 			oldMachine: &AzureMachine{
@@ -1154,3 +1192,28 @@ func createMachineWithCapacityReservaionGroupID(capacityReservationGroupID strin
 		},
 	}
 }
+
+func createMachineWithDisableExtenionOperationsAndHasExtension() *AzureMachine {
+	return &AzureMachine{
+		Spec: AzureMachineSpec{
+			SSHPublicKey:               validSSHPublicKey,
+			OSDisk:                     validOSDisk,
+			DisableExtensionOperations: ptr.To(true),
+			VMExtensions: []VMExtension{{
+				Name:      "test-extension",
+				Publisher: "test-publiher",
+				Version:   "v0.0.1-test",
+			}},
+		},
+	}
+}
+
+func createMachineWithDisableExtenionOperations() *AzureMachine {
+	return &AzureMachine{
+		Spec: AzureMachineSpec{
+			SSHPublicKey:               validSSHPublicKey,
+			OSDisk:                     validOSDisk,
+			DisableExtensionOperations: ptr.To(true),
+		},
+	}
+}

api/v1beta1/azuremachinetemplate_webhook.go

@@ -24,6 +24,7 @@ import (
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/util/validation/field"
+	"k8s.io/utils/ptr"
 	"sigs.k8s.io/cluster-api/util/topology"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/webhook"
@@ -85,6 +86,10 @@ func (r *AzureMachineTemplate) ValidateCreate(ctx context.Context, obj runtime.O
 		}
 	}
 
+	if ptr.Deref(r.Spec.Template.Spec.DisableExtensionOperations, false) && len(r.Spec.Template.Spec.VMExtensions) > 0 {
+		allErrs = append(allErrs, field.Forbidden(field.NewPath("AzureMachineTemplate", "spec", "template", "spec", "VMExtensions"), "VMExtensions must be empty when DisableExtensionOperations is true"))
+	}
+
 	if len(allErrs) == 0 {
 		return nil, nil
 	}

api/v1beta1/azuremachinetemplate_webhook_test.go

@@ -143,6 +143,16 @@ func TestAzureMachineTemplate_ValidateCreate(t *testing.T) {
 			machineTemplate: createAzureMachineTemplateFromMachine(createMachineWithRoleAssignmentName()),
 			wantErr:         true,
 		},
+		{
+			name:            "azuremachinetemplate with DisableExtensionOperations true and without VMExtensions",
+			machineTemplate: createAzureMachineTemplateFromMachine(createMachineWithDisableExtenionOperations()),
+			wantErr:         false,
+		},
+		{
+			name:            "azuremachinetempalte with DisableExtensionOperations true and with VMExtension",
+			machineTemplate: createAzureMachineTemplateFromMachine(createMachineWithDisableExtenionOperationsAndHasExtension()),
+			wantErr:         true,
+		},
 		{
 			name:            "azuremachinetemplate without RoleAssignmentName",
 			machineTemplate: createAzureMachineTemplateFromMachine(createMachineWithoutRoleAssignmentName()),

azure/scope/machine.go

@@ -178,6 +178,7 @@
 		SpotVMOptions:              m.AzureMachine.Spec.SpotVMOptions,
 		SecurityProfile:            m.AzureMachine.Spec.SecurityProfile,
 		DiagnosticsProfile:         m.AzureMachine.Spec.Diagnostics,
+		DisableExtensionOperations: ptr.Deref(m.AzureMachine.Spec.DisableExtensionOperations, false),
 		AdditionalTags:             m.AdditionalTags(),
 		AdditionalCapabilities:     m.AzureMachine.Spec.AdditionalCapabilities,
 		CapacityReservationGroupID: m.GetCapacityReservationGroupID(),
@@ -374,6 +375,10 @@
 
 // VMExtensionSpecs returns the VM extension specs.
 func (m *MachineScope) VMExtensionSpecs() []azure.ResourceSpecGetter {
+	if ptr.Deref(m.AzureMachine.Spec.DisableExtensionOperations, false) {
+		return []azure.ResourceSpecGetter{}
+	}
+
 	var extensionSpecs = []azure.ResourceSpecGetter{}
 	for _, extension := range m.AzureMachine.Spec.VMExtensions {
 		extensionSpecs = append(extensionSpecs, &vmextensions.VMExtensionSpec{

azure/scope/machine_test.go

@@ -598,6 +598,44 @@ func TestMachineScope_VMExtensionSpecs(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "If OS type is Linux and cloud is AzurePublicCloud and DisableExtensionOperations is true, it returns empty",
+			machineScope: MachineScope{
+				Machine: &clusterv1.Machine{},
+				AzureMachine: &infrav1.AzureMachine{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: "machine-name",
+					},
+					Spec: infrav1.AzureMachineSpec{
+						DisableExtensionOperations: ptr.To(true),
+						OSDisk: infrav1.OSDisk{
+							OSType: "Linux",
+						},
+					},
+				},
+				ClusterScoper: &ClusterScope{
+					AzureClients: AzureClients{
+						EnvironmentSettings: auth.EnvironmentSettings{
+							Environment: azureautorest.Environment{
+								Name: azureautorest.PublicCloud.Name,
+							},
+						},
+					},
+					AzureCluster: &infrav1.AzureCluster{
+						Spec: infrav1.AzureClusterSpec{
+							ResourceGroup: "my-rg",
+							AzureClusterClassSpec: infrav1.AzureClusterClassSpec{
+								Location: "westus",
+							},
+						},
+					},
+				},
+				cache: &MachineCache{
+					VMSKU: resourceskus.SKU{},
+				},
+			},
+			want: []azure.ResourceSpecGetter{},
+		},
 		{
 			name: "If OS type is Linux and cloud is not AzurePublicCloud, it returns empty",
 			machineScope: MachineScope{

azure/services/virtualmachines/spec.go

@@ -53,6 +53,7 @@ type VMSpec struct {
 	AdditionalTags             infrav1.Tags
 	AdditionalCapabilities     *infrav1.AdditionalCapabilities
 	DiagnosticsProfile         *infrav1.Diagnostics
+	DisableExtensionOperations bool
 	CapacityReservationGroupID string
 	SKU                        resourceskus.SKU
 	Image                      *infrav1.Image
@@ -263,9 +264,10 @@ func (s *VMSpec) generateOSProfile() (*armcompute.OSProfile, error) {
 	}
 
 	osProfile := &armcompute.OSProfile{
-		ComputerName:  ptr.To(s.Name),
-		AdminUsername: ptr.To(azure.DefaultUserName),
-		CustomData:    ptr.To(s.BootstrapData),
+		ComputerName:             ptr.To(s.Name),
+		AdminUsername:            ptr.To(azure.DefaultUserName),
+		CustomData:               ptr.To(s.BootstrapData),
+		AllowExtensionOperations: ptr.To(!s.DisableExtensionOperations),
 	}
 
 	switch s.OSDisk.OSType {

config/crd/bases/infrastructure.cluster.x-k8s.io_azuremachines.yaml

@@ -238,6 +238,12 @@ spec:
                     - storageAccountType
                     type: object
                 type: object
+              disableExtensionOperations:
+                description: |-
+                  DisableExtensionOperations specifies whether extension operations should be disabled on the virtual machine.
+                  Use this setting only if VMExtensions are not supported by your image, as it disables CAPZ bootstrapping extension used for detecting Kubernetes bootstrap failure.
+                  This may only be set to True when no extensions are configured on the virtual machine.
+                type: boolean
               dnsServers:
                 description: DNSServers adds a list of DNS Server IP addresses to
                   the VM NICs.

config/crd/bases/infrastructure.cluster.x-k8s.io_azuremachinetemplates.yaml

@@ -253,6 +253,12 @@ spec:
                             - storageAccountType
                             type: object
                         type: object
+                      disableExtensionOperations:
+                        description: |-
+                          DisableExtensionOperations specifies whether extension operations should be disabled on the virtual machine.
+                          Use this setting only if VMExtensions are not supported by your image, as it disables CAPZ bootstrapping extension used for detecting Kubernetes bootstrap failure.
+                          This may only be set to True when no extensions are configured on the virtual machine.
+                        type: boolean
                       dnsServers:
                         description: DNSServers adds a list of DNS Server IP addresses
                           to the VM NICs.