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addons.go
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addons.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 botanist
import (
"context"
"fmt"
"path/filepath"
"strings"
"github.com/gardener/gardener/charts"
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"
extensionsv1alpha1helper "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1/helper"
"github.com/gardener/gardener/pkg/chartrenderer"
"github.com/gardener/gardener/pkg/controllerutils"
netpol "github.com/gardener/gardener/pkg/operation/botanist/addons/networkpolicy"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/operation/botanist/component/extensions/dns"
extensionsdnsrecord "github.com/gardener/gardener/pkg/operation/botanist/component/extensions/dnsrecord"
"github.com/gardener/gardener/pkg/operation/botanist/component/nodelocaldns"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/managedresources"
"github.com/gardener/gardener/pkg/utils/secrets"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
// SecretLabelKeyManagedResource is a key for a label on a secret with the value 'managed-resource'.
SecretLabelKeyManagedResource = "managed-resource"
)
// GenerateKubernetesDashboardConfig generates the values which are required to render the chart of
// the kubernetes-dashboard properly.
func (b *Botanist) GenerateKubernetesDashboardConfig() (map[string]interface{}, error) {
var (
enabled = gardencorev1beta1helper.KubernetesDashboardEnabled(b.Shoot.GetInfo().Spec.Addons)
values = map[string]interface{}{}
)
if b.APIServerSNIEnabled() {
values["kubeAPIServerHost"] = b.outOfClusterAPIServerFQDN()
}
if enabled && b.Shoot.GetInfo().Spec.Addons.KubernetesDashboard.AuthenticationMode != nil {
values["authenticationMode"] = *b.Shoot.GetInfo().Spec.Addons.KubernetesDashboard.AuthenticationMode
}
return common.GenerateAddonConfig(values, enabled), nil
}
// DeployIngressDNS deploys the nginx ingress DNSEntry and DNSOwner resources.
func (b *Botanist) DeployIngressDNS(ctx context.Context) error {
if b.NeedsIngressDNS() {
if b.isRestorePhase() {
return dnsRestoreDeployer{
entry: b.Shoot.Components.Extensions.DNS.NginxEntry,
owner: b.Shoot.Components.Extensions.DNS.NginxOwner,
}.Deploy(ctx)
}
return component.OpWaiter(
b.Shoot.Components.Extensions.DNS.NginxOwner,
b.Shoot.Components.Extensions.DNS.NginxEntry,
).Deploy(ctx)
}
return component.OpWaiter(
b.Shoot.Components.Extensions.DNS.NginxEntry,
b.Shoot.Components.Extensions.DNS.NginxOwner,
).Deploy(ctx)
}
// DestroyIngressDNS destroys the nginx ingress DNSEntry and DNSOwner resources.
func (b *Botanist) DestroyIngressDNS(ctx context.Context) error {
return component.OpDestroyAndWait(
b.Shoot.Components.Extensions.DNS.NginxEntry,
b.Shoot.Components.Extensions.DNS.NginxOwner,
).Destroy(ctx)
}
// MigrateIngressDNS destroys the nginx ingress DNSEntry and DNSOwner resources,
// without removing the entry from the DNS provider.
func (b *Botanist) MigrateIngressDNS(ctx context.Context) error {
return component.OpDestroyAndWait(
b.Shoot.Components.Extensions.DNS.NginxOwner,
b.Shoot.Components.Extensions.DNS.NginxEntry,
).Destroy(ctx)
}
// DefaultNginxIngressDNSEntry returns a Deployer which removes existing nginx ingress DNSEntry.
func (b *Botanist) DefaultNginxIngressDNSEntry() component.DeployWaiter {
return component.OpDestroy(dns.NewEntry(
b.Logger,
b.K8sSeedClient.Client(),
b.Shoot.SeedNamespace,
&dns.EntryValues{
Name: common.ShootDNSIngressName,
TTL: *b.Config.Controllers.Shoot.DNSEntryTTLSeconds,
},
))
}
// DefaultNginxIngressDNSOwner returns DeployWaiter which removes the nginx ingress DNSOwner.
func (b *Botanist) DefaultNginxIngressDNSOwner() component.DeployWaiter {
return component.OpDestroy(dns.NewOwner(
b.K8sSeedClient.Client(),
b.Shoot.SeedNamespace,
&dns.OwnerValues{
Name: common.ShootDNSIngressName,
},
))
}
// NeedsIngressDNS returns true if the Shoot cluster needs ingress DNS.
func (b *Botanist) NeedsIngressDNS() bool {
return b.NeedsExternalDNS() && gardencorev1beta1helper.NginxIngressEnabled(b.Shoot.GetInfo().Spec.Addons)
}
// DefaultIngressDNSRecord creates the default deployer for the ingress DNSRecord resource.
func (b *Botanist) DefaultIngressDNSRecord() extensionsdnsrecord.Interface {
values := &extensionsdnsrecord.Values{
Name: b.Shoot.GetInfo().Name + "-" + common.ShootDNSIngressName,
SecretName: DNSRecordSecretPrefix + "-" + b.Shoot.GetInfo().Name + "-" + v1beta1constants.DNSRecordExternalName,
Namespace: b.Shoot.SeedNamespace,
TTL: b.Config.Controllers.Shoot.DNSEntryTTLSeconds,
AnnotateOperation: controllerutils.HasTask(b.Shoot.GetInfo().Annotations, v1beta1constants.ShootTaskDeployDNSRecordIngress) || b.isRestorePhase(),
}
// Set component values even if the nginx-ingress addons is not enabled.
if b.NeedsExternalDNS() {
values.Type = b.Shoot.ExternalDomain.Provider
if b.Shoot.ExternalDomain.Zone != "" {
values.Zone = &b.Shoot.ExternalDomain.Zone
}
values.SecretData = b.Shoot.ExternalDomain.SecretData
values.DNSName = b.Shoot.GetIngressFQDN("*")
}
return extensionsdnsrecord.New(
b.Logger,
b.K8sSeedClient.Client(),
values,
extensionsdnsrecord.DefaultInterval,
extensionsdnsrecord.DefaultSevereThreshold,
extensionsdnsrecord.DefaultTimeout,
)
}
// DeployOrDestroyIngressDNSRecord deploys, restores, or destroys the ingress DNSRecord and waits for the operation to complete.
func (b *Botanist) DeployOrDestroyIngressDNSRecord(ctx context.Context) error {
if b.NeedsIngressDNS() {
return b.deployIngressDNSRecord(ctx)
}
return b.DestroyIngressDNSRecord(ctx)
}
// deployIngressDNSRecord deploys or restores the ingress DNSRecord and waits for the operation to complete.
func (b *Botanist) deployIngressDNSRecord(ctx context.Context) error {
if err := b.deployOrRestoreDNSRecord(ctx, b.Shoot.Components.Extensions.IngressDNSRecord); err != nil {
return err
}
return b.Shoot.Components.Extensions.IngressDNSRecord.Wait(ctx)
}
// DestroyIngressDNSRecord destroys the ingress DNSRecord and waits for the operation to complete.
func (b *Botanist) DestroyIngressDNSRecord(ctx context.Context) error {
if err := b.Shoot.Components.Extensions.IngressDNSRecord.Destroy(ctx); err != nil {
return err
}
return b.Shoot.Components.Extensions.IngressDNSRecord.WaitCleanup(ctx)
}
// MigrateIngressDNSRecord migrates the ingress DNSRecord and waits for the operation to complete.
func (b *Botanist) MigrateIngressDNSRecord(ctx context.Context) error {
if err := b.Shoot.Components.Extensions.IngressDNSRecord.Migrate(ctx); err != nil {
return err
}
return b.Shoot.Components.Extensions.IngressDNSRecord.WaitMigrate(ctx)
}
// SetNginxIngressAddress sets the IP address of the API server's LoadBalancer.
func (b *Botanist) SetNginxIngressAddress(address string, seedClient client.Client) {
if b.NeedsIngressDNS() {
ownerID := *b.Shoot.GetInfo().Status.ClusterIdentity + "-" + common.ShootDNSIngressName
b.Shoot.Components.Extensions.DNS.NginxOwner = dns.NewOwner(
seedClient,
b.Shoot.SeedNamespace,
&dns.OwnerValues{
Name: common.ShootDNSIngressName,
Active: pointer.Bool(true),
OwnerID: ownerID,
},
)
b.Shoot.Components.Extensions.DNS.NginxEntry = dns.NewEntry(
b.Logger,
seedClient,
b.Shoot.SeedNamespace,
&dns.EntryValues{
Name: common.ShootDNSIngressName,
DNSName: b.Shoot.GetIngressFQDN("*"),
Targets: []string{address},
OwnerID: ownerID,
TTL: *b.Config.Controllers.Shoot.DNSEntryTTLSeconds,
},
)
b.Shoot.Components.Extensions.IngressDNSRecord.SetRecordType(extensionsv1alpha1helper.GetDNSRecordType(address))
b.Shoot.Components.Extensions.IngressDNSRecord.SetValues([]string{address})
}
}
// GenerateNginxIngressConfig generates the values which are required to render the chart of
// the nginx-ingress properly.
func (b *Botanist) GenerateNginxIngressConfig() (map[string]interface{}, error) {
var (
enabled = gardencorev1beta1helper.NginxIngressEnabled(b.Shoot.GetInfo().Spec.Addons)
values map[string]interface{}
)
if enabled {
values = map[string]interface{}{
"controller": map[string]interface{}{
"customConfig": b.Shoot.GetInfo().Spec.Addons.NginxIngress.Config,
"service": map[string]interface{}{
"loadBalancerSourceRanges": b.Shoot.GetInfo().Spec.Addons.NginxIngress.LoadBalancerSourceRanges,
"externalTrafficPolicy": *b.Shoot.GetInfo().Spec.Addons.NginxIngress.ExternalTrafficPolicy,
},
},
}
if b.APIServerSNIEnabled() {
values["kubeAPIServerHost"] = b.outOfClusterAPIServerFQDN()
}
}
return common.GenerateAddonConfig(values, enabled), nil
}
// DeployManagedResourceForAddons deploys all the ManagedResource CRDs for the gardener-resource-manager.
func (b *Botanist) DeployManagedResourceForAddons(ctx context.Context) error {
for name, chartRenderFunc := range map[string]func(context.Context) (*chartrenderer.RenderedChart, error){
common.ManagedResourceShootCoreName: b.generateCoreAddonsChart,
common.ManagedResourceAddonsName: b.generateOptionalAddonsChart,
} {
renderedChart, err := chartRenderFunc(ctx)
if err != nil {
return fmt.Errorf("error rendering %q chart: %+v", name, err)
}
if err := managedresources.CreateForShoot(ctx, b.K8sSeedClient.Client(), b.Shoot.SeedNamespace, name, false, renderedChart.AsSecretData()); err != nil {
return err
}
}
return nil
}
// generateCoreAddonsChart renders the gardener-resource-manager configuration for the core addons. After that it
// creates a ManagedResource CRD that references the rendered manifests and creates it.
func (b *Botanist) generateCoreAddonsChart(ctx context.Context) (*chartrenderer.RenderedChart, error) {
var (
kasFQDN = b.outOfClusterAPIServerFQDN()
global = map[string]interface{}{
"kubernetesVersion": b.Shoot.GetInfo().Spec.Kubernetes.Version,
"podNetwork": b.Shoot.Networks.Pods.String(),
"vpaEnabled": b.Shoot.WantsVerticalPodAutoscaler,
}
podSecurityPolicies = map[string]interface{}{
"allowPrivilegedContainers": *b.Shoot.GetInfo().Spec.Kubernetes.AllowPrivilegedContainers,
}
verticalPodAutoscaler = map[string]interface{}{
"application": map[string]interface{}{
"clusterType": "shoot",
"admissionController": map[string]interface{}{
"createServiceAccount": false,
"controlNamespace": b.Shoot.SeedNamespace,
},
"exporter": map[string]interface{}{"createServiceAccount": false},
"recommender": map[string]interface{}{"createServiceAccount": false},
"updater": map[string]interface{}{"createServiceAccount": false},
},
}
shootInfo = map[string]interface{}{
"projectName": b.Garden.Project.Name,
"shootName": b.Shoot.GetInfo().Name,
"provider": b.Shoot.GetInfo().Spec.Provider.Type,
"region": b.Shoot.GetInfo().Spec.Region,
"kubernetesVersion": b.Shoot.GetInfo().Spec.Kubernetes.Version,
"podNetwork": b.Shoot.Networks.Pods.String(),
"serviceNetwork": b.Shoot.Networks.Services.String(),
"maintenanceBegin": b.Shoot.GetInfo().Spec.Maintenance.TimeWindow.Begin,
"maintenanceEnd": b.Shoot.GetInfo().Spec.Maintenance.TimeWindow.End,
}
nodeExporterConfig = map[string]interface{}{}
blackboxExporterConfig = map[string]interface{}{}
networkPolicyConfig = netpol.ShootNetworkPolicyValues{
Enabled: true,
NodeLocalDNS: netpol.NodeLocalDNSValues{
Enabled: b.Shoot.NodeLocalDNSEnabled,
KubeDNSClusterIP: b.Shoot.Networks.CoreDNS.String(),
},
}
nodeNetwork = b.Shoot.GetInfo().Spec.Networking.Nodes
)
if b.Shoot.IPVSEnabled() {
networkPolicyConfig.NodeLocalDNS.KubeDNSClusterIP = nodelocaldns.IPVSAddress
}
if vpaSecret := b.LoadSecret(common.VPASecretName); vpaSecret != nil {
verticalPodAutoscaler["application"].(map[string]interface{})["admissionController"].(map[string]interface{})["caCert"] = vpaSecret.Data[secrets.DataKeyCertificateCA]
}
workerPools, err := b.computeWorkerPoolsForKubeProxy(ctx)
if err != nil {
return nil, err
}
var kubeProxyWorkerPools []map[string]string
for _, obj := range workerPools {
kubeProxyWorkerPools = append(kubeProxyWorkerPools, map[string]string{
"name": obj.Name,
"kubernetesVersion": obj.KubernetesVersion,
"kubeProxyImage": obj.Image,
})
}
kubeProxy := map[string]interface{}{
"workerPools": kubeProxyWorkerPools,
}
if domain := b.Shoot.ExternalClusterDomain; domain != nil {
shootInfo["domain"] = *domain
}
var extensions []string
for extensionType := range b.Shoot.Components.Extensions.Extension.Extensions() {
extensions = append(extensions, extensionType)
}
shootInfo["extensions"] = strings.Join(extensions, ",")
nodeExporter, err := b.InjectShootShootImages(nodeExporterConfig, images.ImageNameNodeExporter)
if err != nil {
return nil, err
}
blackboxExporter, err := b.InjectShootShootImages(blackboxExporterConfig, images.ImageNameBlackboxExporter)
if err != nil {
return nil, err
}
apiserverProxyConfig := map[string]interface{}{
"advertiseIPAddress": b.APIServerClusterIP,
"proxySeedServer": map[string]interface{}{
"host": kasFQDN,
"port": "8443",
},
"webhook": map[string]interface{}{
"caBundle": b.LoadSecret(v1beta1constants.SecretNameCACluster).Data[secrets.DataKeyCertificateCA],
},
"podMutatorEnabled": b.APIServerSNIPodMutatorEnabled(),
}
apiserverProxy, err := b.InjectShootShootImages(apiserverProxyConfig, images.ImageNameApiserverProxySidecar, images.ImageNameApiserverProxy)
if err != nil {
return nil, err
}
if nodeNetwork != nil {
shootInfo["nodeNetwork"] = *nodeNetwork
}
values := map[string]interface{}{
"global": global,
"coredns": common.GenerateAddonConfig(nil, true),
"vpn-shoot": common.GenerateAddonConfig(nil, true),
"node-local-dns": common.GenerateAddonConfig(nil, b.Shoot.NodeLocalDNSEnabled),
"kube-apiserver-kubelet": common.GenerateAddonConfig(nil, true),
"apiserver-proxy": common.GenerateAddonConfig(apiserverProxy, b.APIServerSNIEnabled()),
"kube-proxy": common.GenerateAddonConfig(kubeProxy, gardencorev1beta1helper.KubeProxyEnabled(b.Shoot.GetInfo().Spec.Kubernetes.KubeProxy)),
"monitoring": common.GenerateAddonConfig(map[string]interface{}{
"node-exporter": nodeExporter,
"blackbox-exporter": blackboxExporter,
}, b.Shoot.Purpose != gardencorev1beta1.ShootPurposeTesting),
"network-policies": networkPolicyConfig,
"node-problem-detector": common.GenerateAddonConfig(nil, true),
"podsecuritypolicies": common.GenerateAddonConfig(podSecurityPolicies, true),
"shoot-info": common.GenerateAddonConfig(shootInfo, true),
"vertical-pod-autoscaler": common.GenerateAddonConfig(verticalPodAutoscaler, b.Shoot.WantsVerticalPodAutoscaler),
"cluster-identity": map[string]interface{}{"clusterIdentity": b.Shoot.GetInfo().Status.ClusterIdentity},
}
return b.K8sShootClient.ChartRenderer().Render(filepath.Join(charts.Path, "shoot-core", "components"), "shoot-core", metav1.NamespaceSystem, values)
}
// generateOptionalAddonsChart renders the gardener-resource-manager chart for the optional addons. After that it
// creates a ManagedResource CRD that references the rendered manifests and creates it.
func (b *Botanist) generateOptionalAddonsChart(_ context.Context) (*chartrenderer.RenderedChart, error) {
global := map[string]interface{}{
"vpaEnabled": b.Shoot.WantsVerticalPodAutoscaler,
}
kubernetesDashboardConfig, err := b.GenerateKubernetesDashboardConfig()
if err != nil {
return nil, err
}
kubernetesDashboardImagesToInject := []string{
images.ImageNameKubernetesDashboard,
images.ImageNameKubernetesDashboardMetricsScraper,
}
kubernetesDashboard, err := b.InjectShootShootImages(kubernetesDashboardConfig, kubernetesDashboardImagesToInject...)
if err != nil {
return nil, err
}
nginxIngressConfig, err := b.GenerateNginxIngressConfig()
if err != nil {
return nil, err
}
nginxIngress, err := b.InjectShootShootImages(nginxIngressConfig, images.ImageNameNginxIngressController, images.ImageNameIngressDefaultBackend)
if err != nil {
return nil, err
}
return b.K8sShootClient.ChartRenderer().Render(filepath.Join(charts.Path, "shoot-addons"), "addons", metav1.NamespaceSystem, map[string]interface{}{
"global": global,
"kubernetes-dashboard": kubernetesDashboard,
"nginx-ingress": nginxIngress,
})
}
// outOfClusterAPIServerFQDN returns the Fully Qualified Domain Name of the apiserver
// with dot "." suffix. It'll prevent extra requests to the DNS in case the record is not
// available.
func (b *Botanist) outOfClusterAPIServerFQDN() string {
return fmt.Sprintf("%s.", b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true))
}