GCP VM's Public IP attachment is now optional

kubernetes/machine_classes/gcp-machine-class.yaml

@@ -24,7 +24,8 @@ spec:
   - key: my-key
     value: my-value
   networkInterfaces:
-  - network: network-name # Network name to attach the instance to
+  - disableExternalIP: false # If external IP is not required for the NIC, set this to true
+    network: network-name # Network name to attach the instance to
     subnetwork: sub-net-name # Subnet name to attach the instance to
   scheduling:
     automaticRestart: true # Automatic restart of instance

pkg/apis/machine/types.go

@@ -1029,8 +1029,9 @@ type GCPMetadata struct {
 
 // GCPNetworkInterface describes network interfaces for GCP
 type GCPNetworkInterface struct {
-	Network    string
-	Subnetwork string
+	DisableExternalIP bool
+	Network           string
+	Subnetwork        string
 }
 
 // GCPScheduling describes scheduling configuration for GCP.

pkg/apis/machine/v1alpha1/types.go

@@ -1121,8 +1121,9 @@ type GCPMetadata struct {
 
 // GCPNetworkInterface describes network interfaces for GCP
 type GCPNetworkInterface struct {
-	Network    string `json:"network,omitempty"`
-	Subnetwork string `json:"subnetwork,omitempty"`
+	DisableExternalIP bool   `json:"disableExternalIP,omitempty"`
+	Network           string `json:"network,omitempty"`
+	Subnetwork        string `json:"subnetwork,omitempty"`
 }
 
 // GCPScheduling describes scheduling configuration for GCP.

pkg/driver/driver_gcp.go

@@ -112,8 +112,11 @@ func (d *GCPDriver) Create() (string, string, error) {
 
 	var networkInterfaces = []*compute.NetworkInterface{}
 	for _, nic := range d.GCPMachineClass.Spec.NetworkInterfaces {
-		computeNIC := &compute.NetworkInterface{
-			AccessConfigs: []*compute.AccessConfig{{}},
+		computeNIC := &compute.NetworkInterface{}
+
+		if nic.DisableExternalIP == false {
+			// When DisableExternalIP is false, implies Attach an external IP to VM
+			computeNIC.AccessConfigs = []*compute.AccessConfig{{}}
 		}
 		if len(nic.Network) != 0 {
 			computeNIC.Network = fmt.Sprintf("projects/%s/global/networks/%s", project, nic.Network)