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machines.go
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machines.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package worker
import (
"context"
"fmt"
"path/filepath"
"sort"
"strconv"
"github.com/Masterminds/semver/v3"
"github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/controller/worker"
genericworkeractuator "github.com/gardener/gardener/extensions/pkg/controller/worker/genericactuator"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
extensionsv1alpha1helper "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1/helper"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/utils"
machinev1alpha1 "github.com/gardener/machine-controller-manager/pkg/apis/machine/v1alpha1"
corev1 "k8s.io/api/core/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener-extension-provider-aws/charts"
awsapi "github.com/gardener/gardener-extension-provider-aws/pkg/apis/aws"
awsapihelper "github.com/gardener/gardener-extension-provider-aws/pkg/apis/aws/helper"
)
var (
// TODO(KA): replace with pkg/utils/version when v1.30 is supported.
// TODO(KA): remove when k8s versions < v1.30 are deprecated
ConstraintK8sGreaterEqual130 *semver.Constraints
)
func init() {
var err error
ConstraintK8sGreaterEqual130, err = semver.NewConstraint(">= 1.30-0")
utilruntime.Must(err)
}
// MachineClassKind yields the name of the machine class kind used by AWS provider.
func (w *workerDelegate) MachineClassKind() string {
return "MachineClass"
}
// MachineClassList yields a newly initialized MachineClassList object.
func (w *workerDelegate) MachineClassList() client.ObjectList {
return &machinev1alpha1.MachineClassList{}
}
// MachineClass yields a newly initialized MachineClass object.
func (w *workerDelegate) MachineClass() client.Object {
return &machinev1alpha1.MachineClass{}
}
// DeployMachineClasses generates and creates the AWS specific machine classes.
func (w *workerDelegate) DeployMachineClasses(ctx context.Context) error {
if w.machineClasses == nil {
if err := w.generateMachineConfig(ctx); err != nil {
return err
}
}
return w.seedChartApplier.ApplyFromEmbeddedFS(ctx, charts.InternalChart, filepath.Join(charts.InternalChartsPath, "machineclass"), w.worker.Namespace, "machineclass", kubernetes.Values(map[string]interface{}{"machineClasses": w.machineClasses}))
}
// GenerateMachineDeployments generates the configuration for the desired machine deployments.
func (w *workerDelegate) GenerateMachineDeployments(ctx context.Context) (worker.MachineDeployments, error) {
if w.machineDeployments == nil {
if err := w.generateMachineConfig(ctx); err != nil {
return nil, err
}
}
return w.machineDeployments, nil
}
func (w *workerDelegate) generateMachineConfig(ctx context.Context) error {
var (
machineDeployments = worker.MachineDeployments{}
machineClasses []map[string]interface{}
machineImages []awsapi.MachineImage
)
infrastructureStatus := &awsapi.InfrastructureStatus{}
if _, _, err := w.decoder.Decode(w.worker.Spec.InfrastructureProviderStatus.Raw, nil, infrastructureStatus); err != nil {
return err
}
nodesSecurityGroup, err := awsapihelper.FindSecurityGroupForPurpose(infrastructureStatus.VPC.SecurityGroups, awsapi.PurposeNodes)
if err != nil {
return err
}
for _, pool := range w.worker.Spec.Pools {
zoneLen := int32(len(pool.Zones))
workerConfig := &awsapi.WorkerConfig{}
if pool.ProviderConfig != nil && pool.ProviderConfig.Raw != nil {
if _, _, err := w.decoder.Decode(pool.ProviderConfig.Raw, nil, workerConfig); err != nil {
return fmt.Errorf("could not decode provider config: %+v", err)
}
}
workerPoolHash, err := worker.WorkerPoolHash(pool, w.cluster, computeAdditionalHashData(pool)...)
if err != nil {
return err
}
arch := ptr.Deref(pool.Architecture, v1beta1constants.ArchitectureAMD64)
ami, err := w.findMachineImage(pool.MachineImage.Name, pool.MachineImage.Version, w.worker.Spec.Region, &arch)
if err != nil {
return err
}
machineImages = appendMachineImage(machineImages, awsapi.MachineImage{
Name: pool.MachineImage.Name,
Version: pool.MachineImage.Version,
AMI: ami,
Architecture: &arch,
})
blockDevices, err := w.computeBlockDevices(pool, workerConfig)
if err != nil {
return err
}
iamInstanceProfile, err := computeIAMInstanceProfile(workerConfig, infrastructureStatus)
if err != nil {
return err
}
instanceMetadataOptions, err := ComputeInstanceMetadata(workerConfig, w.cluster)
if err != nil {
return err
}
userData, err := worker.FetchUserData(ctx, w.client, w.worker.Namespace, pool)
if err != nil {
return err
}
for zoneIndex, zone := range pool.Zones {
zoneIdx := int32(zoneIndex)
nodesSubnet, err := awsapihelper.FindSubnetForPurposeAndZone(infrastructureStatus.VPC.Subnets, awsapi.PurposeNodes, zone)
if err != nil {
return err
}
machineClassSpec := map[string]interface{}{
"ami": ami,
"region": w.worker.Spec.Region,
"machineType": pool.MachineType,
"iamInstanceProfile": iamInstanceProfile,
"networkInterfaces": []map[string]interface{}{
{
"subnetID": nodesSubnet.ID,
"securityGroupIDs": []string{nodesSecurityGroup.ID},
},
},
"tags": utils.MergeStringMaps(
map[string]string{
fmt.Sprintf("kubernetes.io/cluster/%s", w.worker.Namespace): "1",
"kubernetes.io/role/node": "1",
},
pool.Labels,
),
"credentialsSecretRef": map[string]interface{}{
"name": w.worker.Spec.SecretRef.Name,
"namespace": w.worker.Spec.SecretRef.Namespace,
},
"secret": map[string]interface{}{
"cloudConfig": string(userData),
},
"blockDevices": blockDevices,
"instanceMetadataOptions": instanceMetadataOptions,
}
if len(infrastructureStatus.EC2.KeyName) > 0 {
machineClassSpec["keyName"] = infrastructureStatus.EC2.KeyName
}
if workerConfig.NodeTemplate != nil {
machineClassSpec["nodeTemplate"] = machinev1alpha1.NodeTemplate{
Capacity: workerConfig.NodeTemplate.Capacity,
InstanceType: pool.MachineType,
Region: w.worker.Spec.Region,
Zone: zone,
}
} else if pool.NodeTemplate != nil {
machineClassSpec["nodeTemplate"] = machinev1alpha1.NodeTemplate{
Capacity: pool.NodeTemplate.Capacity,
InstanceType: pool.MachineType,
Region: w.worker.Spec.Region,
Zone: zone,
}
}
if pool.MachineImage.Name != "" && pool.MachineImage.Version != "" {
machineClassSpec["operatingSystem"] = map[string]interface{}{
"operatingSystemName": pool.MachineImage.Name,
"operatingSystemVersion": pool.MachineImage.Version,
}
}
var (
deploymentName = fmt.Sprintf("%s-%s-z%d", w.worker.Namespace, pool.Name, zoneIndex+1)
className = fmt.Sprintf("%s-%s", deploymentName, workerPoolHash)
awsCSIDriverTopologyKey = "topology.ebs.csi.aws.com/zone"
)
machineDeployments = append(machineDeployments, worker.MachineDeployment{
Name: deploymentName,
ClassName: className,
SecretName: className,
Minimum: worker.DistributeOverZones(zoneIdx, pool.Minimum, zoneLen),
Maximum: worker.DistributeOverZones(zoneIdx, pool.Maximum, zoneLen),
MaxSurge: worker.DistributePositiveIntOrPercent(zoneIdx, pool.MaxSurge, zoneLen, pool.Maximum),
MaxUnavailable: worker.DistributePositiveIntOrPercent(zoneIdx, pool.MaxUnavailable, zoneLen, pool.Minimum),
// TODO: remove the csi topology label when AWS CSI driver stops using the aws csi topology key - https://github.com/kubernetes-sigs/aws-ebs-csi-driver/issues/899
// add aws csi driver topology label if it's not specified
Labels: utils.MergeStringMaps(pool.Labels, map[string]string{awsCSIDriverTopologyKey: zone}),
Annotations: pool.Annotations,
Taints: pool.Taints,
MachineConfiguration: genericworkeractuator.ReadMachineConfiguration(pool),
ClusterAutoscalerAnnotations: extensionsv1alpha1helper.GetMachineDeploymentClusterAutoscalerAnnotations(pool.ClusterAutoscaler),
})
machineClassSpec["name"] = className
machineClassSpec["labels"] = map[string]string{corev1.LabelZoneFailureDomain: zone}
machineClassSpec["secret"].(map[string]interface{})["labels"] = map[string]string{v1beta1constants.GardenerPurpose: v1beta1constants.GardenPurposeMachineClass}
machineClasses = append(machineClasses, machineClassSpec)
}
}
w.machineDeployments = machineDeployments
w.machineClasses = machineClasses
w.machineImages = machineImages
return nil
}
func (w *workerDelegate) computeBlockDevices(pool extensionsv1alpha1.WorkerPool, workerConfig *awsapi.WorkerConfig) ([]map[string]interface{}, error) {
var blockDevices []map[string]interface{}
// handle root disk
rootDisk, err := computeEBSForVolume(*pool.Volume)
if err != nil {
return nil, fmt.Errorf("error when computing EBS for root disk: %w", err)
}
if workerConfig.Volume != nil {
if workerConfig.Volume.IOPS != nil {
rootDisk["iops"] = *workerConfig.Volume.IOPS
}
if workerConfig.Volume.Throughput != nil {
rootDisk["throughput"] = *workerConfig.Volume.Throughput
}
}
blockDevices = append(blockDevices, map[string]interface{}{"ebs": rootDisk})
// handle data disks
if dataVolumes := pool.DataVolumes; len(dataVolumes) > 0 {
blockDevices[0]["deviceName"] = "/root"
// sort data volumes for consistent device naming
sort.Slice(dataVolumes, func(i, j int) bool {
return dataVolumes[i].Name < dataVolumes[j].Name
})
for i, vol := range dataVolumes {
dataDisk, err := computeEBSForDataVolume(vol)
if err != nil {
return nil, fmt.Errorf("error when computing EBS for %v: %w", vol, err)
}
if dvConfig := awsapihelper.FindDataVolumeByName(workerConfig.DataVolumes, vol.Name); dvConfig != nil {
if dvConfig.IOPS != nil {
dataDisk["iops"] = *dvConfig.IOPS
}
if dvConfig.SnapshotID != nil {
dataDisk["snapshotID"] = *dvConfig.SnapshotID
}
if dvConfig.Throughput != nil {
dataDisk["throughput"] = *dvConfig.Throughput
}
}
deviceName, err := computeEBSDeviceNameForIndex(i)
if err != nil {
return nil, fmt.Errorf("error when computing EBS device name for %v: %w", vol, err)
}
blockDevices = append(blockDevices, map[string]interface{}{
"deviceName": deviceName,
"ebs": dataDisk,
})
}
}
return blockDevices, nil
}
func computeEBSForVolume(volume extensionsv1alpha1.Volume) (map[string]interface{}, error) {
return computeEBS(volume.Size, volume.Type, volume.Encrypted)
}
func computeEBSForDataVolume(volume extensionsv1alpha1.DataVolume) (map[string]interface{}, error) {
return computeEBS(volume.Size, volume.Type, volume.Encrypted)
}
func computeEBS(size string, volumeType *string, encrypted *bool) (map[string]interface{}, error) {
volumeSize, err := worker.DiskSize(size)
if err != nil {
return nil, err
}
ebs := map[string]interface{}{
"volumeSize": volumeSize,
"encrypted": true,
"deleteOnTermination": true,
}
if volumeType != nil {
ebs["volumeType"] = *volumeType
}
if encrypted != nil {
ebs["encrypted"] = *encrypted
}
return ebs, nil
}
// AWS device naming https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html
func computeEBSDeviceNameForIndex(index int) (string, error) {
var (
deviceNamePrefix = "/dev/sd"
deviceNameSuffix = "fghijklmnop"
)
if index >= len(deviceNameSuffix) {
return "", fmt.Errorf("unsupported data volume number")
}
return deviceNamePrefix + deviceNameSuffix[index:index+1], nil
}
func computeAdditionalHashData(pool extensionsv1alpha1.WorkerPool) []string {
var additionalData []string
if pool.Volume != nil && pool.Volume.Encrypted != nil {
additionalData = append(additionalData, strconv.FormatBool(*pool.Volume.Encrypted))
}
for _, dv := range pool.DataVolumes {
additionalData = append(additionalData, dv.Size)
if dv.Type != nil {
additionalData = append(additionalData, *dv.Type)
}
if dv.Encrypted != nil {
additionalData = append(additionalData, strconv.FormatBool(*dv.Encrypted))
}
}
return additionalData
}
func computeIAMInstanceProfile(workerConfig *awsapi.WorkerConfig, infrastructureStatus *awsapi.InfrastructureStatus) (map[string]interface{}, error) {
if workerConfig.IAMInstanceProfile == nil {
nodesInstanceProfile, err := awsapihelper.FindInstanceProfileForPurpose(infrastructureStatus.IAM.InstanceProfiles, awsapi.PurposeNodes)
if err != nil {
return nil, err
}
return map[string]interface{}{"name": nodesInstanceProfile.Name}, nil
}
if v := workerConfig.IAMInstanceProfile.Name; v != nil {
return map[string]interface{}{"name": *v}, nil
}
if v := workerConfig.IAMInstanceProfile.ARN; v != nil {
return map[string]interface{}{"arn": *v}, nil
}
return nil, fmt.Errorf("unable to compute IAM instance profile configuration")
}
// ComputeInstanceMetadata calculates the InstanceMetadata options for a particular worker pool.
func ComputeInstanceMetadata(workerConfig *awsapi.WorkerConfig, cluster *controller.Cluster) (map[string]interface{}, error) {
res := make(map[string]interface{})
// apply new defaults for k8s >= v1.30 to require the use of IMDSv2, unless explicitly opted out.
if workerConfig == nil || workerConfig.InstanceMetadataOptions == nil {
k8sVersion, err := semver.NewVersion(cluster.Shoot.Spec.Kubernetes.Version)
if err != nil {
return nil, err
}
if ConstraintK8sGreaterEqual130.Check(k8sVersion) {
res["httpPutResponseHopLimit"] = int64(2)
res["httpTokens"] = string(awsapi.HTTPTokensRequired)
}
return res, nil
}
if workerConfig.InstanceMetadataOptions.HTTPPutResponseHopLimit != nil {
res["httpPutResponseHopLimit"] = *workerConfig.InstanceMetadataOptions.HTTPPutResponseHopLimit
}
if workerConfig.InstanceMetadataOptions.HTTPTokens != nil {
res["httpTokens"] = string(*workerConfig.InstanceMetadataOptions.HTTPTokens)
}
return res, nil
}