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defaults.go
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defaults.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 v1alpha1
import (
"math"
"time"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/utils"
versionutils "github.com/gardener/gardener/pkg/utils/version"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/utils/pointer"
)
func addDefaultingFuncs(scheme *runtime.Scheme) error {
return RegisterDefaults(scheme)
}
// SetDefaults_SecretBinding sets default values for SecretBinding objects.
func SetDefaults_SecretBinding(obj *SecretBinding) {
if len(obj.SecretRef.Namespace) == 0 {
obj.SecretRef.Namespace = obj.Namespace
}
for i, quota := range obj.Quotas {
if len(quota.Namespace) == 0 {
obj.Quotas[i].Namespace = obj.Namespace
}
}
}
// SetDefaults_Project sets default values for Project objects.
func SetDefaults_Project(obj *Project) {
defaultSubject(obj.Spec.Owner)
for i, member := range obj.Spec.Members {
defaultSubject(&obj.Spec.Members[i].Subject)
if len(member.Role) == 0 && len(member.Roles) == 0 {
obj.Spec.Members[i].Role = ProjectMemberViewer
}
}
if obj.Spec.Namespace != nil && *obj.Spec.Namespace == v1beta1constants.GardenNamespace {
if obj.Spec.Tolerations == nil {
obj.Spec.Tolerations = &ProjectTolerations{}
}
addTolerations(&obj.Spec.Tolerations.Whitelist, Toleration{Key: SeedTaintProtected})
addTolerations(&obj.Spec.Tolerations.Defaults, Toleration{Key: SeedTaintProtected})
}
}
func defaultSubject(obj *rbacv1.Subject) {
if obj != nil && len(obj.APIGroup) == 0 {
switch obj.Kind {
case rbacv1.ServiceAccountKind:
obj.APIGroup = ""
case rbacv1.UserKind:
obj.APIGroup = rbacv1.GroupName
case rbacv1.GroupKind:
obj.APIGroup = rbacv1.GroupName
}
}
}
// SetDefaults_MachineType sets default values for MachineType objects.
func SetDefaults_MachineType(obj *MachineType) {
if obj.Usable == nil {
trueVar := true
obj.Usable = &trueVar
}
}
// SetDefaults_VolumeType sets default values for VolumeType objects.
func SetDefaults_VolumeType(obj *VolumeType) {
if obj.Usable == nil {
trueVar := true
obj.Usable = &trueVar
}
}
// SetDefaults_Seed sets default values for Seed objects.
func SetDefaults_Seed(obj *Seed) {
if obj.Spec.Settings == nil {
obj.Spec.Settings = &SeedSettings{}
}
if obj.Spec.Settings.ExcessCapacityReservation == nil {
obj.Spec.Settings.ExcessCapacityReservation = &SeedSettingExcessCapacityReservation{Enabled: true}
}
if obj.Spec.Settings.Scheduling == nil {
obj.Spec.Settings.Scheduling = &SeedSettingScheduling{Visible: true}
}
if obj.Spec.Settings.ShootDNS == nil {
obj.Spec.Settings.ShootDNS = &SeedSettingShootDNS{Enabled: true}
}
if obj.Spec.Settings.VerticalPodAutoscaler == nil {
obj.Spec.Settings.VerticalPodAutoscaler = &SeedSettingVerticalPodAutoscaler{Enabled: true}
}
}
// SetDefaults_Shoot sets default values for Shoot objects.
func SetDefaults_Shoot(obj *Shoot) {
k8sVersionLessThan116, _ := versionutils.CompareVersions(obj.Spec.Kubernetes.Version, "<", "1.16")
k8sVersionGreaterOrEqualThan122, _ := versionutils.CompareVersions(obj.Spec.Kubernetes.Version, ">=", "1.22")
// Error is ignored here because we cannot do anything meaningful with it.
// k8sVersionLessThan116 and k8sVersionGreaterOrEqualThan122 will default to `false`.
if obj.Spec.Kubernetes.AllowPrivilegedContainers == nil {
obj.Spec.Kubernetes.AllowPrivilegedContainers = pointer.Bool(true)
}
if obj.Spec.Kubernetes.KubeAPIServer == nil {
obj.Spec.Kubernetes.KubeAPIServer = &KubeAPIServerConfig{}
}
if obj.Spec.Kubernetes.KubeAPIServer.EnableBasicAuthentication == nil {
if k8sVersionLessThan116 {
obj.Spec.Kubernetes.KubeAPIServer.EnableBasicAuthentication = pointer.Bool(true)
} else {
obj.Spec.Kubernetes.KubeAPIServer.EnableBasicAuthentication = pointer.Bool(false)
}
}
if obj.Spec.Kubernetes.KubeAPIServer.Requests == nil {
obj.Spec.Kubernetes.KubeAPIServer.Requests = &KubeAPIServerRequests{}
}
if obj.Spec.Kubernetes.KubeAPIServer.Requests.MaxNonMutatingInflight == nil {
obj.Spec.Kubernetes.KubeAPIServer.Requests.MaxNonMutatingInflight = pointer.Int32(400)
}
if obj.Spec.Kubernetes.KubeAPIServer.Requests.MaxMutatingInflight == nil {
obj.Spec.Kubernetes.KubeAPIServer.Requests.MaxMutatingInflight = pointer.Int32(200)
}
if obj.Spec.Kubernetes.KubeControllerManager == nil {
obj.Spec.Kubernetes.KubeControllerManager = &KubeControllerManagerConfig{}
}
if obj.Spec.Kubernetes.KubeControllerManager.NodeCIDRMaskSize == nil {
obj.Spec.Kubernetes.KubeControllerManager.NodeCIDRMaskSize = calculateDefaultNodeCIDRMaskSize(obj.Spec.Kubernetes.Kubelet, obj.Spec.Provider.Workers)
}
if obj.Spec.Kubernetes.KubeControllerManager.PodEvictionTimeout == nil {
obj.Spec.Kubernetes.KubeControllerManager.PodEvictionTimeout = &metav1.Duration{Duration: 2 * time.Minute}
}
if obj.Spec.Kubernetes.KubeControllerManager.NodeMonitorGracePeriod == nil {
obj.Spec.Kubernetes.KubeControllerManager.NodeMonitorGracePeriod = &metav1.Duration{Duration: 2 * time.Minute}
}
if obj.Spec.Kubernetes.KubeProxy == nil {
obj.Spec.Kubernetes.KubeProxy = &KubeProxyConfig{}
}
if obj.Spec.Kubernetes.KubeProxy.Mode == nil {
defaultProxyMode := ProxyModeIPTables
obj.Spec.Kubernetes.KubeProxy.Mode = &defaultProxyMode
}
if obj.Spec.Kubernetes.KubeProxy.Enabled == nil {
obj.Spec.Kubernetes.KubeProxy.Enabled = pointer.Bool(true)
}
if obj.Spec.Addons == nil {
obj.Spec.Addons = &Addons{}
}
if obj.Spec.Addons.KubernetesDashboard == nil {
obj.Spec.Addons.KubernetesDashboard = &KubernetesDashboard{}
}
if obj.Spec.Addons.KubernetesDashboard.AuthenticationMode == nil {
var defaultAuthMode string
if *obj.Spec.Kubernetes.KubeAPIServer.EnableBasicAuthentication {
defaultAuthMode = KubernetesDashboardAuthModeBasic
} else {
defaultAuthMode = KubernetesDashboardAuthModeToken
}
obj.Spec.Addons.KubernetesDashboard.AuthenticationMode = &defaultAuthMode
}
if obj.Spec.Purpose == nil {
p := ShootPurposeEvaluation
obj.Spec.Purpose = &p
}
// In previous Gardener versions that weren't supporting tolerations, it was hard-coded to (only) allow shoots in the
// `garden` namespace to use seeds that had the 'protected' taint. In order to be backwards compatible, now with the
// introduction of tolerations, we add the 'protected' toleration to the garden namespace by default.
if obj.Namespace == v1beta1constants.GardenNamespace {
addTolerations(&obj.Spec.Tolerations, Toleration{Key: SeedTaintProtected})
}
if obj.Spec.Kubernetes.Kubelet == nil {
obj.Spec.Kubernetes.Kubelet = &KubeletConfig{}
}
if obj.Spec.Kubernetes.Kubelet.FailSwapOn == nil {
obj.Spec.Kubernetes.Kubelet.FailSwapOn = pointer.Bool(true)
}
if obj.Spec.Kubernetes.Kubelet.ImageGCHighThresholdPercent == nil {
obj.Spec.Kubernetes.Kubelet.ImageGCHighThresholdPercent = pointer.Int32(50)
}
if obj.Spec.Kubernetes.Kubelet.ImageGCLowThresholdPercent == nil {
obj.Spec.Kubernetes.Kubelet.ImageGCLowThresholdPercent = pointer.Int32(40)
}
var (
kubeReservedMemory = resource.MustParse("1Gi")
kubeReservedCPU = resource.MustParse("80m")
kubeReservedPID = resource.MustParse("20k")
)
if obj.Spec.Kubernetes.Kubelet.KubeReserved == nil {
obj.Spec.Kubernetes.Kubelet.KubeReserved = &KubeletConfigReserved{Memory: &kubeReservedMemory, CPU: &kubeReservedCPU}
obj.Spec.Kubernetes.Kubelet.KubeReserved.PID = &kubeReservedPID
} else {
if obj.Spec.Kubernetes.Kubelet.KubeReserved.Memory == nil {
obj.Spec.Kubernetes.Kubelet.KubeReserved.Memory = &kubeReservedMemory
}
if obj.Spec.Kubernetes.Kubelet.KubeReserved.CPU == nil {
obj.Spec.Kubernetes.Kubelet.KubeReserved.CPU = &kubeReservedCPU
}
if obj.Spec.Kubernetes.Kubelet.KubeReserved.PID == nil {
obj.Spec.Kubernetes.Kubelet.KubeReserved.PID = &kubeReservedPID
}
}
if obj.Spec.Maintenance == nil {
obj.Spec.Maintenance = &Maintenance{}
}
if obj.Spec.Kubernetes.KubeAPIServer.EnableAnonymousAuthentication == nil {
obj.Spec.Kubernetes.KubeAPIServer.EnableAnonymousAuthentication = pointer.Bool(false)
}
if k8sVersionGreaterOrEqualThan122 {
for i := range obj.Spec.Provider.Workers {
if obj.Spec.Provider.Workers[i].CRI != nil {
continue
}
obj.Spec.Provider.Workers[i].CRI = &CRI{Name: CRINameContainerD}
}
}
}
// SetDefaults_Maintenance sets default values for Maintenance objects.
func SetDefaults_Maintenance(obj *Maintenance) {
if obj.AutoUpdate == nil {
obj.AutoUpdate = &MaintenanceAutoUpdate{
KubernetesVersion: true,
MachineImageVersion: true,
}
}
if obj.TimeWindow == nil {
mt := utils.RandomMaintenanceTimeWindow()
obj.TimeWindow = &MaintenanceTimeWindow{
Begin: mt.Begin().Formatted(),
End: mt.End().Formatted(),
}
}
}
// SetDefaults_VerticalPodAutoscaler sets default values for VerticalPodAutoscaler objects.
func SetDefaults_VerticalPodAutoscaler(obj *VerticalPodAutoscaler) {
if obj.EvictAfterOOMThreshold == nil {
v := DefaultEvictAfterOOMThreshold
obj.EvictAfterOOMThreshold = &v
}
if obj.EvictionRateBurst == nil {
v := DefaultEvictionRateBurst
obj.EvictionRateBurst = &v
}
if obj.EvictionRateLimit == nil {
v := DefaultEvictionRateLimit
obj.EvictionRateLimit = &v
}
if obj.EvictionTolerance == nil {
v := DefaultEvictionTolerance
obj.EvictionTolerance = &v
}
if obj.RecommendationMarginFraction == nil {
v := DefaultRecommendationMarginFraction
obj.RecommendationMarginFraction = &v
}
if obj.UpdaterInterval == nil {
v := DefaultUpdaterInterval
obj.UpdaterInterval = &v
}
if obj.RecommenderInterval == nil {
v := DefaultRecommenderInterval
obj.RecommenderInterval = &v
}
}
// SetDefaults_Worker sets default values for Worker objects.
func SetDefaults_Worker(obj *Worker) {
if obj.MaxSurge == nil {
obj.MaxSurge = &DefaultWorkerMaxSurge
}
if obj.MaxUnavailable == nil {
obj.MaxUnavailable = &DefaultWorkerMaxUnavailable
}
if obj.SystemComponents == nil {
obj.SystemComponents = &WorkerSystemComponents{
Allow: DefaultWorkerSystemComponentsAllow,
}
}
}
// SetDefaults_ClusterAutoscaler sets default values for ClusterAutoscaler object.
func SetDefaults_ClusterAutoscaler(obj *ClusterAutoscaler) {
if obj.ScaleDownDelayAfterAdd == nil {
obj.ScaleDownDelayAfterAdd = &metav1.Duration{Duration: 1 * time.Hour}
}
if obj.ScaleDownDelayAfterDelete == nil {
obj.ScaleDownDelayAfterDelete = &metav1.Duration{Duration: 0}
}
if obj.ScaleDownDelayAfterFailure == nil {
obj.ScaleDownDelayAfterFailure = &metav1.Duration{Duration: 3 * time.Minute}
}
if obj.ScaleDownUnneededTime == nil {
obj.ScaleDownUnneededTime = &metav1.Duration{Duration: 30 * time.Minute}
}
if obj.ScaleDownUtilizationThreshold == nil {
obj.ScaleDownUtilizationThreshold = pointer.Float64(0.5)
}
if obj.ScanInterval == nil {
obj.ScanInterval = &metav1.Duration{Duration: 10 * time.Second}
}
if obj.Expander == nil {
leastWaste := ClusterAutoscalerExpanderLeastWaste
obj.Expander = &leastWaste
}
if obj.MaxNodeProvisionTime == nil {
obj.MaxNodeProvisionTime = &metav1.Duration{Duration: 20 * time.Minute}
}
}
// SetDefaults_NginxIngress sets default values for NginxIngress objects.
func SetDefaults_NginxIngress(obj *NginxIngress) {
if obj.ExternalTrafficPolicy == nil {
v := corev1.ServiceExternalTrafficPolicyTypeCluster
obj.ExternalTrafficPolicy = &v
}
}
// SetDefaults_ControllerResource sets default values for ControllerResource objects.
func SetDefaults_ControllerResource(obj *ControllerResource) {
if obj.Primary == nil {
obj.Primary = pointer.Bool(true)
}
}
// SetDefaults_ControllerRegistrationDeployment sets default values for ControllerDeployment objects.
func SetDefaults_ControllerRegistrationDeployment(obj *ControllerRegistrationDeployment) {
p := ControllerDeploymentPolicyOnDemand
if obj.Policy == nil {
obj.Policy = &p
}
}
// Helper functions
func calculateDefaultNodeCIDRMaskSize(kubelet *KubeletConfig, workers []Worker) *int32 {
var maxPods int32 = 110 // default maxPods setting on kubelet
if kubelet != nil && kubelet.MaxPods != nil {
maxPods = *kubelet.MaxPods
}
for _, worker := range workers {
if worker.Kubernetes != nil && worker.Kubernetes.Kubelet != nil && worker.Kubernetes.Kubelet.MaxPods != nil && *worker.Kubernetes.Kubelet.MaxPods > maxPods {
maxPods = *worker.Kubernetes.Kubelet.MaxPods
}
}
// by having approximately twice as many available IP addresses as possible Pods, Kubernetes is able to mitigate IP address reuse as Pods are added to and removed from a node.
nodeCidrRange := int32(32 - int(math.Ceil(math.Log2(float64(maxPods*2)))))
return &nodeCidrRange
}
func addTolerations(tolerations *[]Toleration, additionalTolerations ...Toleration) {
existingTolerations := sets.NewString()
for _, toleration := range *tolerations {
existingTolerations.Insert(utils.IDForKeyWithOptionalValue(toleration.Key, toleration.Value))
}
for _, toleration := range additionalTolerations {
if existingTolerations.Has(toleration.Key) {
continue
}
if existingTolerations.Has(utils.IDForKeyWithOptionalValue(toleration.Key, toleration.Value)) {
continue
}
*tolerations = append(*tolerations, toleration)
}
}