diff --git a/src/cmd/linuxkit/gcp.go b/src/cmd/linuxkit/gcp.go
index 297803019..acf49a495 100644
--- a/src/cmd/linuxkit/gcp.go
+++ b/src/cmd/linuxkit/gcp.go
@@ -178,7 +178,7 @@ func (g GCPClient) DeleteImage(name string) error {
 }
 
 // CreateInstance creates and starts an instance on GCP
-func (g GCPClient) CreateInstance(name, image, zone, machineType string, diskSize int, replace bool) error {
+func (g GCPClient) CreateInstance(name, image, zone, machineType string, disks Disks, replace bool) error {
 	if replace {
 		if err := g.DeleteInstance(name, zone, true); err != nil {
 			return err
@@ -197,32 +197,47 @@ func (g GCPClient) CreateInstance(name, image, zone, machineType string, diskSiz
 	sshKey := new(string)
 	*sshKey = fmt.Sprintf("moby:%s moby", string(ssh.MarshalAuthorizedKey(k)))
 
-	diskName := name + "-systemdisk"
-	diskOp, err := g.compute.Disks.Insert(g.projectName, zone, &compute.Disk{Name: diskName, SizeGb: int64(diskSize)}).Do()
-	if err != nil {
-		return err
+	instanceDisks := []*compute.AttachedDisk{
+		{
+			AutoDelete: true,
+			Boot:       true,
+			InitializeParams: &compute.AttachedDiskInitializeParams{
+				SourceImage: fmt.Sprintf("global/images/%s", image),
+			},
+		},
 	}
-	if err := g.pollZoneOperationStatus(diskOp.Name, zone); err != nil {
-		return err
+
+	for i, disk := range disks {
+		var diskName string
+		if disk.Path != "" {
+			diskName = disk.Path
+		} else {
+			diskName = fmt.Sprintf("%s-disk-%d", name, i)
+		}
+		var diskSizeGb int64
+		if disk.Size == 0 {
+			diskSizeGb = int64(1)
+		} else {
+			diskSizeGb = int64(convertMBtoGB(disk.Size))
+		}
+		diskOp, err := g.compute.Disks.Insert(g.projectName, zone, &compute.Disk{Name: diskName, SizeGb: diskSizeGb}).Do()
+		if err != nil {
+			return err
+		}
+		if err := g.pollZoneOperationStatus(diskOp.Name, zone); err != nil {
+			return err
+		}
+		instanceDisks = append(instanceDisks, &compute.AttachedDisk{
+			AutoDelete: true,
+			Boot:       false,
+			Source:     fmt.Sprintf("zones/%s/disks/%s", zone, diskName),
+		})
 	}
 
 	instanceObj := &compute.Instance{
 		MachineType: fmt.Sprintf("zones/%s/machineTypes/%s", zone, machineType),
 		Name:        name,
-		Disks: []*compute.AttachedDisk{
-			{
-				AutoDelete: true,
-				Boot:       true,
-				InitializeParams: &compute.AttachedDiskInitializeParams{
-					SourceImage: fmt.Sprintf("global/images/%s", image),
-				},
-			},
-			{
-				AutoDelete: true,
-				Boot:       false,
-				Source:     fmt.Sprintf("zones/%s/disks/%s", zone, diskName),
-			},
-		},
+		Disks:       instanceDisks,
 		NetworkInterfaces: []*compute.NetworkInterface{
 			{
 				Network: "global/networks/default",
diff --git a/src/cmd/linuxkit/run_gcp.go b/src/cmd/linuxkit/run_gcp.go
index 41db96589..563f4b24e 100644
--- a/src/cmd/linuxkit/run_gcp.go
+++ b/src/cmd/linuxkit/run_gcp.go
@@ -14,15 +14,14 @@ const (
 	defaultMachine  = "g1-small"
 	defaultDiskSize = 1
 	// Environment variables. Some are non-standard
-	zoneVar     = "CLOUDSDK_COMPUTE_ZONE"
-	machineVar  = "CLOUDSDK_COMPUTE_MACHINE" // non-standard
-	keysVar     = "CLOUDSDK_COMPUTE_KEYS"    // non-standard
-	projectVar  = "CLOUDSDK_CORE_PROJECT"
-	bucketVar   = "CLOUDSDK_IMAGE_BUCKET" // non-standard
-	familyVar   = "CLOUDSDK_IMAGE_FAMILY" // non-standard
-	publicVar   = "CLOUDSDK_IMAGE_PUBLIC" // non-standard
-	nameVar     = "CLOUDSDK_IMAGE_NAME"   // non-standard
-	diskSizeVar = "CLOUDSDK_DISK_SIZE"    // non-standard
+	zoneVar    = "CLOUDSDK_COMPUTE_ZONE"
+	machineVar = "CLOUDSDK_COMPUTE_MACHINE" // non-standard
+	keysVar    = "CLOUDSDK_COMPUTE_KEYS"    // non-standard
+	projectVar = "CLOUDSDK_CORE_PROJECT"
+	bucketVar  = "CLOUDSDK_IMAGE_BUCKET" // non-standard
+	familyVar  = "CLOUDSDK_IMAGE_FAMILY" // non-standard
+	publicVar  = "CLOUDSDK_IMAGE_PUBLIC" // non-standard
+	nameVar    = "CLOUDSDK_IMAGE_NAME"   // non-standard
 )
 
 // Process the run arguments and execute run
@@ -41,7 +40,9 @@ func runGcp(args []string) {
 	machineFlag := flags.String("machine", defaultMachine, "GCP Machine Type")
 	keysFlag := flags.String("keys", "", "Path to Service Account JSON key file")
 	projectFlag := flags.String("project", "", "GCP Project Name")
-	diskSizeFlag := flags.Int("disk-size", 0, "Size of system disk in GB")
+	var disks Disks
+	flags.Var(&disks, "disk", "Disk config, may be repeated. [file=]diskName[,size=1G]")
+
 	skipCleanup := flags.Bool("skip-cleanup", false, "Don't remove images or VMs")
 
 	if err := flags.Parse(args); err != nil {
@@ -60,14 +61,13 @@ func runGcp(args []string) {
 	machine := getStringValue(machineVar, *machineFlag, defaultMachine)
 	keys := getStringValue(keysVar, *keysFlag, "")
 	project := getStringValue(projectVar, *projectFlag, "")
-	diskSize := getIntValue(diskSizeVar, *diskSizeFlag, defaultDiskSize)
 
 	client, err := NewGCPClient(keys, project)
 	if err != nil {
 		log.Fatalf("Unable to connect to GCP")
 	}
 
-	if err = client.CreateInstance(name, name, zone, machine, diskSize, true); err != nil {
+	if err = client.CreateInstance(name, name, zone, machine, disks, true); err != nil {
 		log.Fatal(err)
 	}
 
diff --git a/src/cmd/linuxkit/util.go b/src/cmd/linuxkit/util.go
index f7a8b1faf..93bd2ff75 100644
--- a/src/cmd/linuxkit/util.go
+++ b/src/cmd/linuxkit/util.go
@@ -135,6 +135,18 @@ func getDiskSizeMB(s string) (int, error) {
 	return 1024 * i, nil
 }
 
+func convertMBtoGB(i int) int {
+	if i < 1024 {
+		return 1
+	}
+
+	if i%1024 == 0 {
+		return i / 1024
+	}
+
+	return (i + (1024 - i%1024)) / 1024
+}
+
 // DiskConfig is the config for a disk
 type DiskConfig struct {
 	Path   string