Add DisableBootstrappingVMExtension field

api/v1beta1/azuremachine_types.go

@@ -132,6 +132,12 @@ type AzureMachineSpec struct {
 	// +optional
 	DNSServers []string `json:"dnsServers,omitempty"`
 
+	// DisableBootstrappingVMExtension disables CAPZ Bootstrapping VM extension.
+	// Its role is to detect and report Kubernetes bootstrap failure or success.
+	// Use this setting if VMExtensions are not supported by your image.
+	// +optional
+	DisableBootstrappingVMExtension *bool `json:"disableBootstrappingVMExtension,omitempty"`
+
 	// VMExtensions specifies a list of extensions to be added to the virtual machine.
 	// +optional
 	VMExtensions []VMExtension `json:"vmExtensions,omitempty"`

azure/scope/machine.go

@@ -391,7 +391,11 @@ func (m *MachineScope) VMExtensionSpecs() []azure.ResourceSpecGetter {
 	}
 
 	cpuArchitectureType, _ := m.cache.VMSKU.GetCapability(resourceskus.CPUArchitectureType)
-	bootstrapExtensionSpec := azure.GetBootstrappingVMExtension(m.AzureMachine.Spec.OSDisk.OSType, m.CloudEnvironment(), m.Name(), cpuArchitectureType)
+
+	var bootstrapExtensionSpec *azure.ExtensionSpec
+	if !ptr.Deref(m.AzureMachine.Spec.DisableBootstrappingVMExtension, false) {
+		bootstrapExtensionSpec = azure.GetBootstrappingVMExtension(m.AzureMachine.Spec.OSDisk.OSType, m.CloudEnvironment(), m.Name(), cpuArchitectureType)
+	}
 
 	if bootstrapExtensionSpec != nil {
 		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 DisableBootstrapExtension is true, it returns empty",
+			machineScope: MachineScope{
+				Machine: &clusterv1.Machine{},
+				AzureMachine: &infrav1.AzureMachine{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: "machine-name",
+					},
+					Spec: infrav1.AzureMachineSpec{
+						DisableBootstrappingVMExtension: 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{

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

@@ -238,6 +238,12 @@ spec:
                     - storageAccountType
                     type: object
                 type: object
+              disableBootstrappingVMExtension:
+                description: |-
+                  DisableBootstrappingVMExtension disables CAPZ Bootstrapping VM extension.
+                  Its role is to detect and report Kubernetes bootstrap failure or success.
+                  Use this setting if VMExtensions are not supported by your image.
+                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
+                      disableBootstrappingVMExtension:
+                        description: |-
+                          DisableBootstrappingVMExtension disables CAPZ Bootstrapping VM extension.
+                          Its role is to detect and report Kubernetes bootstrap failure or success.
+                          Use this setting if VMExtensions are not supported by your image.
+                        type: boolean
                       dnsServers:
                         description: DNSServers adds a list of DNS Server IP addresses
                           to the VM NICs.