add ProvisioningModel to enable gcp spot instances

Author: de1987

machine/v1beta1/types_gcpprovider.go

@@ -25,6 +25,14 @@ const (
 	RestartPolicyNever GCPRestartPolicyType = "Never"
 )
 
+// GCPProvisioningModelType is a type representing acceptable values for ProvisioningModel field in GCPMachineProviderSpec
+type GCPProvisioningModelType string
+
+const (
+	// GCPSpotInstance To enable the GCP instances as spot type.
+	GCPSpotInstance GCPProvisioningModelType = "Spot"
+)
+
 // SecureBootPolicy represents the secure boot configuration for the GCP machine.
 type SecureBootPolicy string
 
@@ -129,6 +137,13 @@ type GCPMachineProviderSpec struct {
 	// preemptible indicates if created instance is preemptible.
 	// +optional
 	Preemptible bool `json:"preemptible,omitempty"`
+	// provisioningModel is used to enable GCP spot instances.
+	// the only value supported is "Spot"
+	// Cannot have preemptible enabled and be a GCP spot instance at the sametime
+	// +kubebuilder:validation:MinLength=1
+	// +kubebuilder:validation:MaxLength=32
+	// +optional
+	ProvisioningModel GCPProvisioningModelType `json:"provisioningModel,omitempty"`
 	// onHostMaintenance determines the behavior when a maintenance event occurs that might cause the instance to reboot.
 	// This is required to be set to "Terminate" if you want to provision machine with attached GPUs.
 	// Otherwise, allowed values are "Migrate" and "Terminate".