/
kubeapiserver.go
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/
kubeapiserver.go
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// Copyright 2021 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 botanist
import (
"context"
"fmt"
"net"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/component/apiserver"
"github.com/gardener/gardener/pkg/component/kubeapiserver"
"github.com/gardener/gardener/pkg/component/shared"
"github.com/gardener/gardener/pkg/features"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
secretsutils "github.com/gardener/gardener/pkg/utils/secrets"
)
// DefaultKubeAPIServer returns a deployer for the kube-apiserver.
func (b *Botanist) DefaultKubeAPIServer(ctx context.Context) (kubeapiserver.Interface, error) {
var (
pods, services string
vpnConfig = kubeapiserver.VPNConfig{
Enabled: false,
}
)
if b.Shoot.Networks != nil {
if b.Shoot.Networks.Pods != nil {
pods = b.Shoot.Networks.Pods.String()
}
if b.Shoot.Networks.Services != nil {
services = b.Shoot.Networks.Services.String()
}
}
if !b.Shoot.IsWorkerless {
vpnConfig.Enabled = true
vpnConfig.PodNetworkCIDR = pods
// NodeNetworkCIDR is set on deployment to handle dynamice node network CIDRs
vpnConfig.HighAvailabilityEnabled = b.Shoot.VPNHighAvailabilityEnabled
vpnConfig.HighAvailabilityNumberOfSeedServers = b.Shoot.VPNHighAvailabilityNumberOfSeedServers
vpnConfig.HighAvailabilityNumberOfShootClients = b.Shoot.VPNHighAvailabilityNumberOfShootClients
}
return shared.NewKubeAPIServer(
ctx,
b.SeedClientSet,
b.GardenClient,
b.Shoot.SeedNamespace,
b.Shoot.GetInfo().ObjectMeta,
b.Seed.KubernetesVersion,
b.Shoot.KubernetesVersion,
b.SecretsManager,
"",
b.Shoot.GetInfo().Spec.Kubernetes.KubeAPIServer,
b.computeKubeAPIServerAutoscalingConfig(),
services,
vpnConfig,
v1beta1constants.PriorityClassNameShootControlPlane500,
b.Shoot.IsWorkerless,
b.Shoot.GetInfo().Spec.Kubernetes.EnableStaticTokenKubeconfig,
nil,
nil,
nil,
nil,
features.DefaultFeatureGate.Enabled(features.APIServerFastRollout),
)
}
func (b *Botanist) computeKubeAPIServerAutoscalingConfig() apiserver.AutoscalingConfig {
var (
hvpaEnabled = features.DefaultFeatureGate.Enabled(features.HVPA)
useMemoryMetricForHvpaHPA = false
scaleDownDisabledForHvpa = false
defaultReplicas *int32
minReplicas int32 = 1
maxReplicas int32 = 4
apiServerResources corev1.ResourceRequirements
)
if b.ManagedSeed != nil {
hvpaEnabled = features.DefaultFeatureGate.Enabled(features.HVPAForShootedSeed)
}
if b.Shoot.Purpose == gardencorev1beta1.ShootPurposeProduction {
minReplicas = 2
}
if v1beta1helper.IsHAControlPlaneConfigured(b.Shoot.GetInfo()) {
minReplicas = 3
}
if metav1.HasAnnotation(b.Shoot.GetInfo().ObjectMeta, v1beta1constants.ShootAlphaControlPlaneScaleDownDisabled) {
minReplicas = 4
scaleDownDisabledForHvpa = true
}
nodeCount := b.Shoot.GetMinNodeCount()
if hvpaEnabled {
nodeCount = b.Shoot.GetMaxNodeCount()
}
if hvpaEnabled {
apiServerResources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("500m"),
corev1.ResourceMemory: resource.MustParse("1Gi"),
},
}
} else {
apiServerResources = resourcesRequirementsForKubeAPIServer(nodeCount)
}
if b.ManagedSeed != nil {
useMemoryMetricForHvpaHPA = true
if b.ManagedSeedAPIServer != nil {
minReplicas = *b.ManagedSeedAPIServer.Autoscaler.MinReplicas
maxReplicas = b.ManagedSeedAPIServer.Autoscaler.MaxReplicas
if !hvpaEnabled {
defaultReplicas = b.ManagedSeedAPIServer.Replicas
apiServerResources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("1750m"),
corev1.ResourceMemory: resource.MustParse("2Gi"),
},
}
}
}
}
return apiserver.AutoscalingConfig{
APIServerResources: apiServerResources,
HVPAEnabled: hvpaEnabled,
Replicas: defaultReplicas,
MinReplicas: minReplicas,
MaxReplicas: maxReplicas,
UseMemoryMetricForHvpaHPA: useMemoryMetricForHvpaHPA,
ScaleDownDisabledForHvpa: scaleDownDisabledForHvpa,
}
}
func resourcesRequirementsForKubeAPIServer(nodeCount int32) corev1.ResourceRequirements {
var cpuRequest, memoryRequest string
switch {
case nodeCount <= 2:
cpuRequest, memoryRequest = "800m", "800Mi"
case nodeCount <= 10:
cpuRequest, memoryRequest = "1000m", "1100Mi"
case nodeCount <= 50:
cpuRequest, memoryRequest = "1200m", "1600Mi"
case nodeCount <= 100:
cpuRequest, memoryRequest = "2500m", "5200Mi"
default:
cpuRequest, memoryRequest = "3000m", "5200Mi"
}
return corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse(cpuRequest),
corev1.ResourceMemory: resource.MustParse(memoryRequest),
},
}
}
func (b *Botanist) computeKubeAPIServerServerCertificateConfig() kubeapiserver.ServerCertificateConfig {
var (
ipAddresses = []net.IP{}
dnsNames = []string{
gardenerutils.GetAPIServerDomain(b.Shoot.InternalClusterDomain),
b.Shoot.GetInfo().Status.TechnicalID,
}
)
if b.Shoot.Networks != nil {
ipAddresses = append(ipAddresses, b.Shoot.Networks.APIServer)
}
if b.Shoot.ExternalClusterDomain != nil {
dnsNames = append(dnsNames, *(b.Shoot.GetInfo().Spec.DNS.Domain), gardenerutils.GetAPIServerDomain(*b.Shoot.ExternalClusterDomain))
}
return kubeapiserver.ServerCertificateConfig{
ExtraIPAddresses: ipAddresses,
ExtraDNSNames: dnsNames,
}
}
func (b *Botanist) computeKubeAPIServerSNIConfig() kubeapiserver.SNIConfig {
var config kubeapiserver.SNIConfig
if b.ShootUsesDNS() {
config.Enabled = true
config.AdvertiseAddress = b.APIServerClusterIP
}
// Add control plane wildcard certificate to TLS SNI config if it is available.
if b.ControlPlaneWildcardCert != nil {
config.TLS = append(config.TLS, kubeapiserver.TLSSNIConfig{SecretName: &b.ControlPlaneWildcardCert.Name, DomainPatterns: []string{b.ComputeKubeAPIServerHost()}})
}
return config
}
// DeployKubeAPIServer deploys the Kubernetes API server.
func (b *Botanist) DeployKubeAPIServer(ctx context.Context) error {
externalServer := b.Shoot.ComputeOutOfClusterAPIServerAddress(false)
var nodes *string
if network := b.Shoot.GetInfo().Spec.Networking; network != nil {
nodes = network.Nodes
}
if err := shared.DeployKubeAPIServer(
ctx,
b.SeedClientSet.Client(),
b.Shoot.SeedNamespace,
b.Shoot.Components.ControlPlane.KubeAPIServer,
b.Shoot.GetInfo().Spec.Kubernetes.KubeAPIServer,
b.computeKubeAPIServerServerCertificateConfig(),
b.computeKubeAPIServerSNIConfig(),
b.Shoot.ComputeOutOfClusterAPIServerAddress(true),
externalServer,
nodes,
b.Shoot.ResourcesToEncrypt,
b.Shoot.EncryptedResources,
v1beta1helper.GetShootETCDEncryptionKeyRotationPhase(b.Shoot.GetInfo().Status.Credentials),
v1beta1helper.GetShootServiceAccountKeyRotationPhase(b.Shoot.GetInfo().Status.Credentials),
b.Shoot.HibernationEnabled,
); err != nil {
return err
}
if enableStaticTokenKubeconfig := b.Shoot.GetInfo().Spec.Kubernetes.EnableStaticTokenKubeconfig; enableStaticTokenKubeconfig == nil || *enableStaticTokenKubeconfig {
userKubeconfigSecret, found := b.SecretsManager.Get(kubeapiserver.SecretNameUserKubeconfig)
if !found {
return fmt.Errorf("secret %q not found", kubeapiserver.SecretNameUserKubeconfig)
}
// add CA bundle as ca.crt to kubeconfig secret for backwards-compatibility
caBundleSecret, found := b.SecretsManager.Get(v1beta1constants.SecretNameCACluster)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCACluster)
}
kubeconfigSecretData := userKubeconfigSecret.DeepCopy().Data
kubeconfigSecretData[secretsutils.DataKeyCertificateCA] = caBundleSecret.Data[secretsutils.DataKeyCertificateBundle]
if err := b.syncShootCredentialToGarden(
ctx,
gardenerutils.ShootProjectSecretSuffixKubeconfig,
map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleKubeconfig},
map[string]string{"url": "https://" + externalServer},
kubeconfigSecretData,
); err != nil {
return err
}
} else {
secretName := gardenerutils.ComputeShootProjectResourceName(b.Shoot.GetInfo().Name, gardenerutils.ShootProjectSecretSuffixKubeconfig)
if err := kubernetesutils.DeleteObject(ctx, b.GardenClient, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: secretName, Namespace: b.Shoot.GetInfo().Namespace}}); err != nil {
return err
}
}
return nil
}
// DeleteKubeAPIServer deletes the kube-apiserver deployment in the Seed cluster which holds the Shoot's control plane.
func (b *Botanist) DeleteKubeAPIServer(ctx context.Context) error {
// invalidate shoot client here before deleting API server
if err := b.ShootClientMap.InvalidateClient(keys.ForShoot(b.Shoot.GetInfo())); err != nil {
return err
}
b.ShootClientSet = nil
return b.Shoot.Components.ControlPlane.KubeAPIServer.Destroy(ctx)
}
// WakeUpKubeAPIServer creates a service and ensures API Server is scaled up
func (b *Botanist) WakeUpKubeAPIServer(ctx context.Context) error {
if err := b.Shoot.Components.ControlPlane.KubeAPIServerService.Deploy(ctx); err != nil {
return err
}
if err := b.Shoot.Components.ControlPlane.KubeAPIServerService.Wait(ctx); err != nil {
return err
}
if b.ShootUsesDNS() {
if err := b.DeployKubeAPIServerSNI(ctx); err != nil {
return err
}
}
if err := b.DeployKubeAPIServer(ctx); err != nil {
return err
}
if err := kubernetes.ScaleDeployment(ctx, b.SeedClientSet.Client(), kubernetesutils.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1); err != nil {
return err
}
return b.Shoot.Components.ControlPlane.KubeAPIServer.Wait(ctx)
}
// ScaleKubeAPIServerToOne scales kube-apiserver replicas to one.
func (b *Botanist) ScaleKubeAPIServerToOne(ctx context.Context) error {
return kubernetes.ScaleDeployment(ctx, b.SeedClientSet.Client(), kubernetesutils.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), 1)
}