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vpa.go
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vpa.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 vpa
import (
"context"
"fmt"
"time"
"github.com/Masterminds/semver/v3"
monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
policyv1 "k8s.io/api/policy/v1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
vpaautoscalingv1 "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/component"
vpaconstants "github.com/gardener/gardener/pkg/component/autoscaling/vpa/constants"
"github.com/gardener/gardener/pkg/component/observability/monitoring/prometheus/seed"
monitoringutils "github.com/gardener/gardener/pkg/component/observability/monitoring/utils"
"github.com/gardener/gardener/pkg/utils"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/managedresources"
secretsutils "github.com/gardener/gardener/pkg/utils/secrets"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
)
const (
// ManagedResourceControlName is the name of the vpa managed resource for seeds.
ManagedResourceControlName = "vpa"
shootManagedResourceName = "shoot-core-" + ManagedResourceControlName
)
// Interface contains functions for a VPA deployer.
type Interface interface {
component.DeployWaiter
// GetValues returns the current configuration values of the deployer.
GetValues() Values
}
// New creates a new instance of DeployWaiter for the Kubernetes Vertical Pod Autoscaler.
func New(
client client.Client,
namespace string,
secretsManager secretsmanager.Interface,
values Values,
) Interface {
return &vpa{
client: client,
namespace: namespace,
secretsManager: secretsManager,
values: values,
}
}
type vpa struct {
client client.Client
namespace string
secretsManager secretsmanager.Interface
values Values
caSecretName string
caBundle []byte
serverSecretName string
genericTokenKubeconfigSecretName *string
}
// Values is a set of configuration values for the VPA components.
type Values struct {
// ClusterType specifies the type of the cluster to which VPA is being deployed.
// For seeds, all resources are being deployed as part of a ManagedResource (except for the CRDs - those must be
// deployed separately because the VPA components themselves create VPA resources, hence the CRD must exist
// beforehand).
// For shoots, the VPA runs in the shoot namespace in the seed as part of the control plane. Hence, only the runtime
// resources (like Deployment, Service, etc.) are being deployed directly (with the client). All other application-
// related resources (like RBAC roles, CRD, etc.) are deployed as part of a ManagedResource.
ClusterType component.ClusterType
// Enabled specifies if VPA is enabled.
Enabled bool
// SecretNameServerCA is the name of the server CA secret.
SecretNameServerCA string
// RuntimeKubernetesVersion is the Kubernetes version of the runtime cluster.
RuntimeKubernetesVersion *semver.Version
// AdmissionController is a set of configuration values for the vpa-admission-controller.
AdmissionController ValuesAdmissionController
// Recommender is a set of configuration values for the vpa-recommender.
Recommender ValuesRecommender
// Updater is a set of configuration values for the vpa-updater.
Updater ValuesUpdater
}
func (v *vpa) Deploy(ctx context.Context) error {
caSecret, found := v.secretsManager.Get(v.values.SecretNameServerCA)
if !found {
return fmt.Errorf("secret %q not found", v.values.SecretNameServerCA)
}
v.caSecretName = caSecret.Name
v.caBundle = caSecret.Data[secretsutils.DataKeyCertificateBundle]
serverSecret, err := v.secretsManager.Generate(ctx, &secretsutils.CertificateSecretConfig{
Name: "vpa-admission-controller-server",
CommonName: fmt.Sprintf("%s.%s.svc", vpaconstants.AdmissionControllerServiceName, v.namespace),
DNSNames: kubernetesutils.DNSNamesForService(vpaconstants.AdmissionControllerServiceName, v.namespace),
CertType: secretsutils.ServerCert,
SkipPublishingCACertificate: true,
}, secretsmanager.SignedByCA(v.values.SecretNameServerCA, secretsmanager.UseCurrentCA), secretsmanager.Rotate(secretsmanager.InPlace))
if err != nil {
return err
}
v.serverSecretName = serverSecret.Name
var allResources component.ResourceConfigs
if v.values.Enabled {
allResources = component.MergeResourceConfigs(
v.admissionControllerResourceConfigs(),
v.recommenderResourceConfigs(),
v.updaterResourceConfigs(),
v.generalResourceConfigs(),
)
}
var registry *managedresources.Registry
if v.values.ClusterType == component.ClusterTypeSeed {
registry = managedresources.NewRegistry(kubernetes.SeedScheme, kubernetes.SeedCodec, kubernetes.SeedSerializer)
} else {
registry = managedresources.NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer)
}
if v.values.ClusterType == component.ClusterTypeShoot {
genericTokenKubeconfigSecret, found := v.secretsManager.Get(v1beta1constants.SecretNameGenericTokenKubeconfig)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameGenericTokenKubeconfig)
}
v.genericTokenKubeconfigSecretName = &genericTokenKubeconfigSecret.Name
for _, name := range []string{
v1beta1constants.DeploymentNameVPAAdmissionController,
v1beta1constants.DeploymentNameVPARecommender,
v1beta1constants.DeploymentNameVPAUpdater,
} {
if err := gardenerutils.NewShootAccessSecret(name, v.namespace).Reconcile(ctx, v.client); err != nil {
return err
}
}
crdDeployer := NewCRD(nil, registry)
if err := crdDeployer.Deploy(ctx); err != nil {
return err
}
}
return component.DeployResourceConfigs(ctx, v.client, v.namespace, v.values.ClusterType, v.managedResourceName(), nil, registry, allResources)
}
func (v *vpa) Destroy(ctx context.Context) error {
return component.DestroyResourceConfigs(ctx, v.client, v.namespace, v.values.ClusterType, v.managedResourceName(),
v.admissionControllerResourceConfigs(),
v.recommenderResourceConfigs(),
v.updaterResourceConfigs(),
v.generalResourceConfigs(),
)
}
// TimeoutWaitForManagedResource is the timeout used while waiting for the ManagedResources to become healthy
// or deleted.
var TimeoutWaitForManagedResource = 2 * time.Minute
func (v *vpa) Wait(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilHealthy(timeoutCtx, v.client, v.namespace, v.managedResourceName())
}
func (v *vpa) WaitCleanup(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilDeleted(timeoutCtx, v.client, v.namespace, v.managedResourceName())
}
func (v *vpa) GetValues() Values {
return v.values
}
func (v *vpa) managedResourceName() string {
if v.values.ClusterType == component.ClusterTypeSeed {
return ManagedResourceControlName
}
return shootManagedResourceName
}
func (v *vpa) emptyService(name string) *corev1.Service {
return &corev1.Service{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: v.namespace}}
}
func (v *vpa) emptyServiceAccount(name string) *corev1.ServiceAccount {
return &corev1.ServiceAccount{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: v.namespace}}
}
func (v *vpa) emptyClusterRole(name string) *rbacv1.ClusterRole {
return &rbacv1.ClusterRole{ObjectMeta: metav1.ObjectMeta{Name: v.rbacNamePrefix() + name}}
}
func (v *vpa) emptyClusterRoleBinding(name string) *rbacv1.ClusterRoleBinding {
return &rbacv1.ClusterRoleBinding{ObjectMeta: metav1.ObjectMeta{Name: v.rbacNamePrefix() + name}}
}
func (v *vpa) emptyDeployment(name string) *appsv1.Deployment {
return &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: v.namespace}}
}
func (v *vpa) emptyPodDisruptionBudget(name string) *policyv1.PodDisruptionBudget {
return &policyv1.PodDisruptionBudget{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: v.namespace}}
}
func (v *vpa) emptyPodMonitor(name string) *monitoringv1.PodMonitor {
return &monitoringv1.PodMonitor{ObjectMeta: monitoringutils.ConfigObjectMeta(name, v.namespace, seed.Label)}
}
func (v *vpa) emptyVerticalPodAutoscaler(name string) *vpaautoscalingv1.VerticalPodAutoscaler {
return &vpaautoscalingv1.VerticalPodAutoscaler{ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: v.namespace}}
}
func (v *vpa) emptyMutatingWebhookConfiguration() *admissionregistrationv1.MutatingWebhookConfiguration {
suffix := "source"
if v.values.ClusterType == component.ClusterTypeShoot {
suffix = "target"
}
// The order in which MutatingWebhooks are called is determined alphabetically. This webhook's name intentionally
// starts with 'zzz', such that it is called after all other webhooks which inject containers. All containers
// injected by webhooks that are called _after_ the vpa webhook will not be under control of vpa.
// See also the `gardener.cloud/description` annotation on the MutatingWebhook.
return &admissionregistrationv1.MutatingWebhookConfiguration{ObjectMeta: metav1.ObjectMeta{Name: "zzz-vpa-webhook-config-" + suffix}}
}
func (v *vpa) rbacNamePrefix() string {
prefix := "gardener.cloud:vpa:"
if v.values.ClusterType == component.ClusterTypeSeed {
return prefix + "source:"
}
return prefix + "target:"
}
func (v *vpa) serviceAccountNamespace() string {
if v.values.ClusterType == component.ClusterTypeSeed {
return v.namespace
}
return metav1.NamespaceSystem
}
func getAppLabel(appValue string) map[string]string {
return map[string]string{v1beta1constants.LabelApp: appValue}
}
func getRoleLabel() map[string]string {
return map[string]string{v1beta1constants.GardenRole: "vpa"}
}
func getAllLabels(appValue string) map[string]string {
return utils.MergeStringMaps(getAppLabel(appValue), getRoleLabel())
}
func (v *vpa) getDeploymentLabels(appValue string) map[string]string {
if v.values.ClusterType == component.ClusterTypeSeed {
return utils.MergeStringMaps(getAppLabel(appValue), getRoleLabel())
}
return utils.MergeStringMaps(getAppLabel(appValue), map[string]string{
v1beta1constants.GardenRole: v1beta1constants.GardenRoleControlPlane,
})
}
func (v *vpa) injectAPIServerConnectionSpec(deployment *appsv1.Deployment, name string, serviceAccountName *string) {
if serviceAccountName != nil {
deployment.Spec.Template.Spec.ServiceAccountName = *serviceAccountName
if name != recommender {
deployment.Spec.Template.Spec.Containers[0].Env = append(deployment.Spec.Template.Spec.Containers[0].Env, corev1.EnvVar{
Name: "NAMESPACE",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
FieldPath: "metadata.namespace",
},
},
})
}
} else {
deployment.Spec.Template.Spec.AutomountServiceAccountToken = ptr.To(false)
utilruntime.Must(gardenerutils.InjectGenericKubeconfig(deployment, *v.genericTokenKubeconfigSecretName, gardenerutils.SecretNamePrefixShootAccess+deployment.Name))
}
}
func durationDeref(ptr *metav1.Duration, def metav1.Duration) metav1.Duration {
if ptr != nil {
return *ptr
}
return def
}