/
shoot.go
570 lines (491 loc) · 22.5 KB
/
shoot.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package shoot
import (
"context"
"fmt"
"net"
"strings"
"time"
"github.com/gardener/gardener/pkg/apis/core"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/operation/garden"
"github.com/gardener/gardener/pkg/utils"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/Masterminds/semver"
dnsv1alpha1 "github.com/gardener/external-dns-management/pkg/apis/dns/v1alpha1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// NewBuilder returns a new Builder.
func NewBuilder() *Builder {
return &Builder{
shootObjectFunc: func() (*gardencorev1beta1.Shoot, error) {
return nil, fmt.Errorf("shoot object is required but not set")
},
cloudProfileFunc: func(string) (*gardencorev1beta1.CloudProfile, error) {
return nil, fmt.Errorf("cloudprofile object is required but not set")
},
shootSecretFunc: func(context.Context, client.Client, string, string) (*corev1.Secret, error) {
return nil, fmt.Errorf("shoot secret object is required but not set")
},
}
}
// WithShootObject sets the shootObjectFunc attribute at the Builder.
func (b *Builder) WithShootObject(shootObject *gardencorev1beta1.Shoot) *Builder {
b.shootObjectFunc = func() (*gardencorev1beta1.Shoot, error) { return shootObject, nil }
return b
}
// WithShootObjectFromLister sets the shootObjectFunc attribute at the Builder after fetching it from the given lister.
func (b *Builder) WithShootObjectFromLister(shootLister gardencorelisters.ShootLister, namespace, name string) *Builder {
b.shootObjectFunc = func() (*gardencorev1beta1.Shoot, error) { return shootLister.Shoots(namespace).Get(name) }
return b
}
// WithCloudProfileObject sets the cloudProfileFunc attribute at the Builder.
func (b *Builder) WithCloudProfileObject(cloudProfileObject *gardencorev1beta1.CloudProfile) *Builder {
b.cloudProfileFunc = func(string) (*gardencorev1beta1.CloudProfile, error) { return cloudProfileObject, nil }
return b
}
// WithCloudProfileObjectFromLister sets the cloudProfileFunc attribute at the Builder after fetching it from the given lister.
func (b *Builder) WithCloudProfileObjectFromLister(cloudProfileLister gardencorelisters.CloudProfileLister) *Builder {
b.cloudProfileFunc = func(name string) (*gardencorev1beta1.CloudProfile, error) { return cloudProfileLister.Get(name) }
return b
}
// WithShootSecret sets the shootSecretFunc attribute at the Builder.
func (b *Builder) WithShootSecret(secret *corev1.Secret) *Builder {
b.shootSecretFunc = func(context.Context, client.Client, string, string) (*corev1.Secret, error) { return secret, nil }
return b
}
// WithShootSecretFromLister sets the shootSecretFunc attribute at the Builder after fetching it from the given lister.
func (b *Builder) WithShootSecretFromSecretBindingLister(secretBindingLister gardencorelisters.SecretBindingLister) *Builder {
b.shootSecretFunc = func(ctx context.Context, c client.Client, namespace, secretBindingName string) (*corev1.Secret, error) {
binding, err := secretBindingLister.SecretBindings(namespace).Get(secretBindingName)
if err != nil {
return nil, err
}
secret := &corev1.Secret{}
if err = c.Get(ctx, kutil.Key(binding.SecretRef.Namespace, binding.SecretRef.Name), secret); err != nil {
return nil, err
}
return secret, nil
}
return b
}
// WithDisableDNS sets the disableDNS attribute at the Builder.
func (b *Builder) WithDisableDNS(disableDNS bool) *Builder {
b.disableDNS = disableDNS
return b
}
// WithProjectName sets the projectName attribute at the Builder.
func (b *Builder) WithProjectName(projectName string) *Builder {
b.projectName = projectName
return b
}
// WithInternalDomain sets the internalDomain attribute at the Builder.
func (b *Builder) WithInternalDomain(internalDomain *garden.Domain) *Builder {
b.internalDomain = internalDomain
return b
}
// WithDefaultDomains sets the defaultDomains attribute at the Builder.
func (b *Builder) WithDefaultDomains(defaultDomains []*garden.Domain) *Builder {
b.defaultDomains = defaultDomains
return b
}
// Build initializes a new Shoot object.
func (b *Builder) Build(ctx context.Context, c client.Client) (*Shoot, error) {
shoot := &Shoot{}
shootObject, err := b.shootObjectFunc()
if err != nil {
return nil, err
}
shoot.Info = shootObject
cloudProfile, err := b.cloudProfileFunc(shootObject.Spec.CloudProfileName)
if err != nil {
return nil, err
}
shoot.CloudProfile = cloudProfile
secret, err := b.shootSecretFunc(ctx, c, shootObject.Namespace, shootObject.Spec.SecretBindingName)
if err != nil {
return nil, err
}
shoot.Secret = secret
shoot.DisableDNS = b.disableDNS
shoot.OperatingSystemConfigsMap = make(map[string]OperatingSystemConfigs, len(shoot.GetWorkerNames()))
shoot.HibernationEnabled = gardencorev1beta1helper.HibernationIsEnabled(shootObject)
shoot.SeedNamespace = ComputeTechnicalID(b.projectName, shootObject)
shoot.InternalClusterDomain = ConstructInternalClusterDomain(shootObject.Name, b.projectName, b.internalDomain)
shoot.ExternalClusterDomain = ConstructExternalClusterDomain(shootObject)
shoot.IgnoreAlerts = gardencorev1beta1helper.ShootIgnoresAlerts(shootObject)
shoot.WantsAlertmanager = !shoot.IgnoreAlerts && shootObject.Spec.Monitoring != nil && shootObject.Spec.Monitoring.Alerting != nil && len(shootObject.Spec.Monitoring.Alerting.EmailReceivers) > 0
extensions, err := calculateExtensions(c, shootObject, shoot.SeedNamespace)
if err != nil {
return nil, fmt.Errorf("cannot calculate required extensions for shoot %s: %v", shootObject.Name, err)
}
shoot.Extensions = extensions
// Determine information about external domain for shoot cluster.
externalDomain, err := ConstructExternalDomain(ctx, c, shootObject, secret, b.defaultDomains)
if err != nil {
return nil, err
}
shoot.ExternalDomain = externalDomain
// Store the Kubernetes version in the format <major>.<minor> on the Shoot object.
v, err := semver.NewVersion(shootObject.Spec.Kubernetes.Version)
if err != nil {
return nil, err
}
shoot.KubernetesMajorMinorVersion = fmt.Sprintf("%d.%d", v.Major(), v.Minor())
needsClusterAutoscaler, err := gardencorev1beta1helper.ShootWantsClusterAutoscaler(shootObject)
if err != nil {
return nil, err
}
shoot.WantsClusterAutoscaler = needsClusterAutoscaler
networks, err := ToNetworks(shootObject)
if err != nil {
return nil, err
}
shoot.Networks = networks
return shoot, nil
}
func calculateExtensions(gardenClient client.Client, shoot *gardencorev1beta1.Shoot, seedNamespace string) (map[string]Extension, error) {
var controllerRegistrations = &gardencorev1beta1.ControllerRegistrationList{}
if err := gardenClient.List(context.TODO(), controllerRegistrations); err != nil {
return nil, err
}
return MergeExtensions(controllerRegistrations.Items, shoot.Spec.Extensions, seedNamespace)
}
// GetIngressFQDN returns the fully qualified domain name of ingress sub-resource for the Shoot cluster. The
// end result is '<subDomain>.<ingressPrefix>.<clusterDomain>'.
func (s *Shoot) GetIngressFQDN(subDomain string) string {
if s.Info.Spec.DNS == nil || s.Info.Spec.DNS.Domain == nil {
return ""
}
return fmt.Sprintf("%s.%s.%s", subDomain, common.IngressPrefix, *(s.Info.Spec.DNS.Domain))
}
// GetPurpose returns the purpose of the shoot or 'evaluation' if it's nil.
func (s *Shoot) GetPurpose() gardencorev1beta1.ShootPurpose {
if v := s.Info.Spec.Purpose; v != nil {
return *v
}
return gardencorev1beta1.ShootPurposeEvaluation
}
// GetWorkerNames returns a list of names of the worker groups in the Shoot manifest.
func (s *Shoot) GetWorkerNames() []string {
var workerNames []string
for _, worker := range s.Info.Spec.Provider.Workers {
workerNames = append(workerNames, worker.Name)
}
return workerNames
}
// GetMinNodeCount returns the sum of all 'minimum' fields of all worker groups of the Shoot.
func (s *Shoot) GetMinNodeCount() int32 {
var nodeCount int32
for _, worker := range s.Info.Spec.Provider.Workers {
nodeCount += worker.Minimum
}
return nodeCount
}
// GetMaxNodeCount returns the sum of all 'maximum' fields of all worker groups of the Shoot.
func (s *Shoot) GetMaxNodeCount() int32 {
var nodeCount int32
for _, worker := range s.Info.Spec.Provider.Workers {
nodeCount += worker.Maximum
}
return nodeCount
}
// GetNodeNetwork returns the nodes network CIDR for the Shoot cluster. If the infrastructure extension
// controller has generated a nodes network then this CIDR will take priority. Otherwise, the nodes network
// CIDR specified in the shoot will be returned (if possible). If no CIDR was specified then nil is returned.
func (s *Shoot) GetNodeNetwork() *string {
if val := s.Info.Spec.Networking.Nodes; val != nil {
return val
}
return nil
}
// KubernetesDashboardEnabled returns true if the kubernetes-dashboard addon is enabled in the Shoot manifest.
func (s *Shoot) KubernetesDashboardEnabled() bool {
return s.Info.Spec.Addons != nil && s.Info.Spec.Addons.KubernetesDashboard != nil && s.Info.Spec.Addons.KubernetesDashboard.Enabled
}
// NginxIngressEnabled returns true if the nginx-ingress addon is enabled in the Shoot manifest.
func (s *Shoot) NginxIngressEnabled() bool {
return s.Info.Spec.Addons != nil && s.Info.Spec.Addons.NginxIngress != nil && s.Info.Spec.Addons.NginxIngress.Enabled
}
// ComputeCloudConfigSecretName computes the name for a secret which contains the original cloud config for
// the worker group with the given <workerName>. It is build by the cloud config secret prefix, the worker
// name itself and a hash of the minor Kubernetes version of the Shoot cluster.
func (s *Shoot) ComputeCloudConfigSecretName(workerName string) string {
return fmt.Sprintf("%s-%s-%s", common.CloudConfigPrefix, workerName, utils.ComputeSHA256Hex([]byte(s.KubernetesMajorMinorVersion))[:5])
}
// GetReplicas returns the given <wokenUp> number if the shoot is not hibernated, or zero otherwise.
func (s *Shoot) GetReplicas(wokenUp int) int {
if s.HibernationEnabled {
return 0
}
return wokenUp
}
// ComputeInClusterAPIServerAddress returns the internal address for the shoot API server depending on whether
// the caller runs in the shoot namespace or not.
func (s *Shoot) ComputeInClusterAPIServerAddress(runsInShootNamespace bool) string {
url := v1beta1constants.DeploymentNameKubeAPIServer
if !runsInShootNamespace {
url = fmt.Sprintf("%s.%s.svc", url, s.SeedNamespace)
}
return url
}
// ComputeOutOfClusterAPIServerAddress returns the external address for the shoot API server depending on whether
// the caller wants to use the internal cluster domain and whether DNS is disabled on this seed.
func (s *Shoot) ComputeOutOfClusterAPIServerAddress(apiServerAddress string, useInternalClusterDomain bool) string {
if s.DisableDNS {
return apiServerAddress
}
if gardencorev1beta1helper.ShootUsesUnmanagedDNS(s.Info) {
return common.GetAPIServerDomain(s.InternalClusterDomain)
}
if useInternalClusterDomain {
return common.GetAPIServerDomain(s.InternalClusterDomain)
}
return common.GetAPIServerDomain(*s.ExternalClusterDomain)
}
// IPVSEnabled returns true if IPVS is enabled for the shoot.
func (s *Shoot) IPVSEnabled() bool {
return s.Info.Spec.Kubernetes.KubeProxy != nil &&
s.Info.Spec.Kubernetes.KubeProxy.Mode != nil &&
*s.Info.Spec.Kubernetes.KubeProxy.Mode == gardencorev1beta1.ProxyModeIPVS
}
// TechnicalIDPrefix is a prefix used for a shoot's technical id.
const TechnicalIDPrefix = "shoot--"
// ComputeTechnicalID determines the technical id of that Shoot which is later used for the name of the
// namespace and for tagging all the resources created in the infrastructure.
func ComputeTechnicalID(projectName string, shoot *gardencorev1beta1.Shoot) string {
// Use the stored technical ID in the Shoot's status field if it's there.
// For backwards compatibility we keep the pattern as it was before we had to change it
// (double hyphens).
if len(shoot.Status.TechnicalID) > 0 {
return shoot.Status.TechnicalID
}
// New clusters shall be created with the new technical id (double hyphens).
return fmt.Sprintf("%s%s--%s", TechnicalIDPrefix, projectName, shoot.Name)
}
// ConstructInternalClusterDomain constructs the internal base domain pof this shoot cluster.
// It is only used for internal purposes (all kubeconfigs except the one which is received by the
// user will only talk with the kube-apiserver via a DNS record of domain). In case the given <internalDomain>
// already contains "internal", the result is constructed as "<shootName>.<shootProject>.<internalDomain>."
// In case it does not, the word "internal" will be appended, resulting in
// "<shootName>.<shootProject>.internal.<internalDomain>".
func ConstructInternalClusterDomain(shootName, shootProject string, internalDomain *garden.Domain) string {
if internalDomain == nil {
return ""
}
if strings.Contains(internalDomain.Domain, common.InternalDomainKey) {
return fmt.Sprintf("%s.%s.%s", shootName, shootProject, internalDomain.Domain)
}
return fmt.Sprintf("%s.%s.%s.%s", shootName, shootProject, common.InternalDomainKey, internalDomain.Domain)
}
// ConstructExternalClusterDomain constructs the external Shoot cluster domain, i.e. the domain which will be put
// into the Kubeconfig handed out to the user.
func ConstructExternalClusterDomain(shoot *gardencorev1beta1.Shoot) *string {
if shoot.Spec.DNS == nil || shoot.Spec.DNS.Domain == nil {
return nil
}
return shoot.Spec.DNS.Domain
}
// ConstructExternalDomain constructs an object containing all relevant information of the external domain that
// shall be used for a shoot cluster - based on the configuration of the Garden cluster and the shoot itself.
func ConstructExternalDomain(ctx context.Context, client client.Client, shoot *gardencorev1beta1.Shoot, shootSecret *corev1.Secret, defaultDomains []*garden.Domain) (*garden.Domain, error) {
externalClusterDomain := ConstructExternalClusterDomain(shoot)
if externalClusterDomain == nil {
return nil, nil
}
var (
externalDomain = &garden.Domain{Domain: *shoot.Spec.DNS.Domain}
defaultDomain = garden.DomainIsDefaultDomain(*externalClusterDomain, defaultDomains)
primaryProvider = gardencorev1beta1helper.FindPrimaryDNSProvider(shoot.Spec.DNS.Providers)
)
switch {
case defaultDomain != nil:
externalDomain.SecretData = defaultDomain.SecretData
externalDomain.Provider = defaultDomain.Provider
externalDomain.IncludeDomains = defaultDomain.IncludeDomains
externalDomain.ExcludeDomains = defaultDomain.ExcludeDomains
externalDomain.IncludeZones = defaultDomain.IncludeZones
externalDomain.ExcludeZones = defaultDomain.ExcludeZones
case primaryProvider != nil:
if primaryProvider.SecretName != nil {
secret := &corev1.Secret{}
if err := client.Get(ctx, kutil.Key(shoot.Namespace, *primaryProvider.SecretName), secret); err != nil {
return nil, fmt.Errorf("could not get dns provider secret %q: %+v", *shoot.Spec.DNS.Providers[0].SecretName, err)
}
externalDomain.SecretData = secret.Data
} else {
externalDomain.SecretData = shootSecret.Data
}
if primaryProvider.Type != nil {
externalDomain.Provider = *primaryProvider.Type
}
if domains := primaryProvider.Domains; domains != nil {
externalDomain.IncludeDomains = domains.Include
externalDomain.ExcludeDomains = domains.Exclude
}
if zones := primaryProvider.Zones; zones != nil {
externalDomain.IncludeZones = zones.Include
externalDomain.ExcludeZones = zones.Exclude
}
default:
return nil, &IncompleteDNSConfigError{}
}
return externalDomain, nil
}
// ExtensionDefaultTimeout is the default timeout and defines how long Gardener should wait
// for a successful reconciliation of this extension resource.
const ExtensionDefaultTimeout = 3 * time.Minute
// MergeExtensions merges the given controller registrations with the given extensions, expecting that each type in extensions is also represented in the registration.
func MergeExtensions(registrations []gardencorev1beta1.ControllerRegistration, extensions []gardencorev1beta1.Extension, namespace string) (map[string]Extension, error) {
var (
typeToExtension = make(map[string]Extension)
requiredExtensions = make(map[string]Extension)
)
// Extensions enabled by default for all Shoot clusters.
for _, reg := range registrations {
for _, res := range reg.Spec.Resources {
if res.Kind != extensionsv1alpha1.ExtensionResource {
continue
}
timeout := ExtensionDefaultTimeout
if res.ReconcileTimeout != nil {
timeout = res.ReconcileTimeout.Duration
}
typeToExtension[res.Type] = Extension{
Extension: extensionsv1alpha1.Extension{
ObjectMeta: metav1.ObjectMeta{
Name: res.Type,
Namespace: namespace,
},
Spec: extensionsv1alpha1.ExtensionSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: res.Type,
},
},
},
Timeout: timeout,
}
if res.GloballyEnabled != nil && *res.GloballyEnabled {
requiredExtensions[res.Type] = typeToExtension[res.Type]
}
}
}
// Extensions defined in Shoot resource.
for _, extension := range extensions {
obj, ok := typeToExtension[extension.Type]
if ok {
if extension.ProviderConfig != nil {
providerConfig := extension.ProviderConfig.RawExtension
obj.Spec.ProviderConfig = &providerConfig
}
requiredExtensions[extension.Type] = obj
continue
}
}
return requiredExtensions, nil
}
// ToNetworks return a network with computed cidrs and ClusterIPs
// for a Shoot
func ToNetworks(s *gardencorev1beta1.Shoot) (*Networks, error) {
if s.Spec.Networking.Services == nil {
return nil, fmt.Errorf("shoot's service cidr is empty")
}
if s.Spec.Networking.Pods == nil {
return nil, fmt.Errorf("shoot's pods cidr is empty")
}
_, svc, err := net.ParseCIDR(*s.Spec.Networking.Services)
if err != nil {
return nil, fmt.Errorf("cannot parse shoot's network cidr %v", err)
}
_, pods, err := net.ParseCIDR(*s.Spec.Networking.Pods)
if err != nil {
return nil, fmt.Errorf("cannot parse shoot's network cidr %v", err)
}
apiserver, err := common.ComputeOffsetIP(svc, 1)
if err != nil {
return nil, fmt.Errorf("cannot calculate default/kubernetes ClusterIP: %v", err)
}
coreDNS, err := common.ComputeOffsetIP(svc, 10)
if err != nil {
return nil, fmt.Errorf("cannot calculate CoreDNS ClusterIP: %v", err)
}
return &Networks{
CoreDNS: coreDNS,
Pods: pods,
Services: svc,
APIServer: apiserver,
}, nil
}
// ComputeRequiredExtensions compute the extension kind/type combinations that are required for the
// reconciliation flow.
func ComputeRequiredExtensions(shoot *gardencorev1beta1.Shoot, seed *gardencorev1beta1.Seed, controllerRegistrationList []*gardencorev1beta1.ControllerRegistration, internalDomain, externalDomain *garden.Domain) sets.String {
requiredExtensions := sets.NewString()
if seed.Spec.Backup != nil {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.BackupBucketResource, seed.Spec.Backup.Provider))
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.BackupEntryResource, seed.Spec.Backup.Provider))
}
// Hint: This is actually a temporary work-around to request the control plane extension of the seed provider type as
// it might come with webhooks that are configuring the exposure of shoot control planes. The ControllerRegistration resource
// does not reflect this today.
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.ControlPlaneResource, seed.Spec.Provider.Type))
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.ControlPlaneResource, shoot.Spec.Provider.Type))
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.InfrastructureResource, shoot.Spec.Provider.Type))
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.NetworkResource, shoot.Spec.Networking.Type))
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.WorkerResource, shoot.Spec.Provider.Type))
for _, extension := range shoot.Spec.Extensions {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.ExtensionResource, extension.Type))
}
for _, pool := range shoot.Spec.Provider.Workers {
if pool.Machine.Image != nil {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.OperatingSystemConfigResource, pool.Machine.Image.Name))
}
if pool.CRI != nil {
for _, cr := range pool.CRI.ContainerRuntimes {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.ContainerRuntimeResource, cr.Type))
}
}
}
if !gardencorev1beta1helper.TaintsHave(seed.Spec.Taints, gardencorev1beta1.SeedTaintDisableDNS) {
if shoot.Spec.DNS != nil {
for _, provider := range shoot.Spec.DNS.Providers {
if provider.Type != nil && *provider.Type != core.DNSUnmanaged {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", dnsv1alpha1.DNSProviderKind, *provider.Type))
}
}
}
if internalDomain != nil && internalDomain.Provider != core.DNSUnmanaged {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", dnsv1alpha1.DNSProviderKind, internalDomain.Provider))
}
if externalDomain != nil && externalDomain.Provider != core.DNSUnmanaged {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", dnsv1alpha1.DNSProviderKind, externalDomain.Provider))
}
}
for _, controllerRegistration := range controllerRegistrationList {
for _, resource := range controllerRegistration.Spec.Resources {
if resource.Kind == extensionsv1alpha1.ExtensionResource && resource.GloballyEnabled != nil && *resource.GloballyEnabled {
requiredExtensions.Insert(fmt.Sprintf("%s/%s", extensionsv1alpha1.ExtensionResource, resource.Type))
}
}
}
return requiredExtensions
}