Add --control-plane-volume-type flag to kops create cluster

Author: Camila-B

cmd/kops/create_cluster.go

@@ -68,6 +68,7 @@ type CreateClusterOptions struct {
 
 	ControlPlaneVolumeSize     int32
 	NodeVolumeSize             int32
+	ControlPlaneVolumeType     string
 	ContainerRuntime           string
 	OutDir                     string
 	DisableSubnetTags          bool
@@ -301,6 +302,8 @@ func NewCmdCreateCluster(f *util.Factory, out io.Writer) *cobra.Command {
 	cmd.Flags().Int32Var(&options.ControlPlaneVolumeSize, "control-plane-volume-size", options.ControlPlaneVolumeSize, "Instance volume size (in GB) for control-plane nodes")
 	cmd.Flags().Int32Var(&options.NodeVolumeSize, "node-volume-size", options.NodeVolumeSize, "Instance volume size (in GB) for worker nodes")
 
+	cmd.Flags().StringVar(&options.ControlPlaneVolumeType, "control-plane-volume-type", options.ControlPlaneVolumeType, "Instance volume type for control-plane nodes")
+
 	cmd.Flags().StringVar(&options.NetworkID, "vpc", options.NetworkID, "Shared Network or VPC to use")
 	cmd.Flags().MarkDeprecated("vpc", "use --network-id instead")
 	cmd.RegisterFlagCompletionFunc("vpc", completeNetworkID)
@@ -616,6 +619,15 @@ func RunCreateCluster(ctx context.Context, f *util.Factory, out io.Writer, c *Cr
 		}
 	}
 
+	if c.ControlPlaneVolumeType != "" {
+		for _, group := range controlPlanes {
+			if group.Spec.RootVolume == nil {
+				group.Spec.RootVolume = &api.InstanceRootVolumeSpec{}
+			}
+			group.Spec.RootVolume.Type = fi.PtrTo(c.ControlPlaneVolumeType)
+		}
+	}
+
 	if c.NodeVolumeSize != 0 {
 		for _, group := range nodes {
 			if group.Spec.RootVolume == nil {

cmd/kops/create_cluster_integration_test.go

@@ -81,6 +81,11 @@ func TestCreateClusterCilium(t *testing.T) {
 	runCreateClusterIntegrationTest(t, "../../tests/integration/create_cluster/cilium-eni", "v1alpha2")
 }
 
+// TestCreateClusterVolumeType tests the control plane volume type flag
+func TestCreateClusterVolumeType(t *testing.T) {
+	runCreateClusterIntegrationTest(t, "../../tests/integration/create_cluster/volume_type", "v1alpha2")
+}
+
 // TestCreateClusterOverride tests the override flag
 func TestCreateClusterOverride(t *testing.T) {
 	runCreateClusterIntegrationTest(t, "../../tests/integration/create_cluster/overrides", "v1alpha2")

pkg/apis/kops/validation/instancegroup.go

@@ -287,6 +287,7 @@ func CrossValidateInstanceGroup(g *kops.InstanceGroup, cluster *kops.Cluster, cl
 			allErrs = append(allErrs, field.Invalid(field.NewPath("spec", "warmPool", "minSize"), warmPool.MinSize, "warm pool minSize cannot be negative"))
 		}
 	}
+	//TODO: Add RootVolume validation for other cloud providers ex. GCE
 
 	if g.Spec.Containerd != nil {
 		allErrs = append(allErrs, validateContainerdConfig(cluster, g.Spec.Containerd, field.NewPath("spec", "containerd"), false)...)
@@ -312,6 +313,10 @@ func ValidateControlPlaneInstanceGroup(g *kops.InstanceGroup, cluster *kops.Clus
 	return allErrs
 }
 
+func validateRootVolumeType(g *kops.InstanceGroup) {
+
+}
+
 var validUserDataTypes = []string{
 	"text/x-include-once-url",
 	"text/x-include-url",

tests/integration/create_cluster/volume_type/expected-v1alpha2.yaml

@@ -0,0 +1,99 @@
+apiVersion: kops.k8s.io/v1alpha2
+kind: Cluster
+metadata:
+  creationTimestamp: "2017-01-01T00:00:00Z"
+  name: volume-types.example.com
+spec:
+  api:
+    loadBalancer:
+      type: Public
+  authorization:
+    rbac: {}
+  channel: stable
+  cloudConfig: {}
+  cloudProvider: gce
+  configBase: memfs://tests/volume-types.example.com
+  etcdClusters:
+  - cpuRequest: 200m
+    etcdMembers:
+    - instanceGroup: control-plane-us-test1-a
+      name: a
+    manager:
+      backupRetentionDays: 90
+    memoryRequest: 100Mi
+    name: main
+  - cpuRequest: 100m
+    etcdMembers:
+    - instanceGroup: control-plane-us-test1-a
+      name: a
+    manager:
+      backupRetentionDays: 90
+    memoryRequest: 100Mi
+    name: events
+  iam:
+    allowContainerRegistry: true
+    legacy: false
+  kubelet:
+    anonymousAuth: false
+  kubernetesApiAccess:
+  - 0.0.0.0/0
+  - ::/0
+  kubernetesVersion: v1.32.0
+  networking:
+    cni: {}
+  nonMasqueradeCIDR: 100.64.0.0/10
+  project: testproject
+  sshAccess:
+  - 0.0.0.0/0
+  - ::/0
+  subnets:
+  - cidr: 10.0.16.0/20
+    name: us-test1
+    region: us-test1
+    type: Public
+  topology:
+    dns:
+      type: None
+
+---
+
+apiVersion: kops.k8s.io/v1alpha2
+kind: InstanceGroup
+metadata:
+  creationTimestamp: "2017-01-01T00:00:00Z"
+  labels:
+    kops.k8s.io/cluster: volume-types.example.com
+  name: control-plane-us-test1-a
+spec:
+  image: ubuntu-os-cloud/ubuntu-2404-noble-amd64-v20250606
+  machineType: e2-medium
+  maxSize: 1
+  minSize: 1
+  role: Master
+  rootVolumeSize: 32
+  rootVolumeType: pd-balanced
+  subnets:
+  - us-test1
+  zones:
+  - us-test1-a
+
+---
+
+apiVersion: kops.k8s.io/v1alpha2
+kind: InstanceGroup
+metadata:
+  creationTimestamp: "2017-01-01T00:00:00Z"
+  labels:
+    kops.k8s.io/cluster: volume-types.example.com
+  name: nodes-us-test1-a
+spec:
+  image: ubuntu-os-cloud/ubuntu-2404-noble-amd64-v20250606
+  machineType: e2-medium
+  maxSize: 1
+  minSize: 1
+  role: Node
+  rootVolumeSize: 64
+  subnets:
+  - us-test1
+  zones:
+  - us-test1-a

tests/integration/create_cluster/volume_type/options.yaml

@@ -0,0 +1,10 @@
+ClusterName: volume-types.example.com
+Zones:
+- us-test1-a
+CloudProvider: gce
+Networking: cni
+Project: testproject
+KubernetesVersion: v1.32.0
+ControlPlaneVolumeSize: 32
+ControlPlaneVolumeType: pd-balanced
+NodeVolumeSize: 64