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coredns.go
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coredns.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 botanist
import (
"context"
"time"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/imagevector"
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/component/networking/coredns"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/features"
imagevectorutils "github.com/gardener/gardener/pkg/utils/imagevector"
)
// DefaultCoreDNS returns a deployer for the CoreDNS.
func (b *Botanist) DefaultCoreDNS() (coredns.Interface, error) {
image, err := imagevector.ImageVector().FindImage(imagevector.ImageNameCoredns, imagevectorutils.RuntimeVersion(b.ShootVersion()), imagevectorutils.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
values := coredns.Values{
// resolve conformance test issue (https://github.com/kubernetes/kubernetes/blob/master/test/e2e/network/dns.go#L44)
// before changing
ClusterDomain: gardencorev1beta1.DefaultDomain,
ClusterIP: b.Shoot.Networks.CoreDNS.String(),
Image: image.String(),
PodNetworkCIDR: b.Shoot.Networks.Pods.String(),
// NodeNetworkCIDR is set on deployment to handle dynamice node network CIDRs
AutoscalingMode: gardencorev1beta1.CoreDNSAutoscalingModeHorizontal,
SearchPathRewritesEnabled: v1beta1helper.IsCoreDNSRewritingEnabled(features.DefaultFeatureGate.Enabled(features.CoreDNSQueryRewriting), b.Shoot.GetInfo().GetAnnotations()),
SearchPathRewriteCommonSuffixes: getCommonSuffixesForRewriting(b.Shoot.GetInfo().Spec.SystemComponents),
KubernetesVersion: b.Shoot.KubernetesVersion,
}
if b.ShootUsesDNS() {
values.APIServerHost = ptr.To(b.outOfClusterAPIServerFQDN())
}
if v1beta1helper.IsCoreDNSAutoscalingModeUsed(b.Shoot.GetInfo().Spec.SystemComponents, gardencorev1beta1.CoreDNSAutoscalingModeClusterProportional) {
image, err = imagevector.ImageVector().FindImage(imagevector.ImageNameClusterProportionalAutoscaler, imagevectorutils.RuntimeVersion(b.ShootVersion()), imagevectorutils.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
values.ClusterProportionalAutoscalerImage = image.String()
values.AutoscalingMode = gardencorev1beta1.CoreDNSAutoscalingModeClusterProportional
values.WantsVerticalPodAutoscaler = b.Shoot.WantsVerticalPodAutoscaler
}
return coredns.New(b.SeedClientSet.Client(), b.Shoot.SeedNamespace, values), nil
}
// DeployCoreDNS deploys the CoreDNS system component.
func (b *Botanist) DeployCoreDNS(ctx context.Context) error {
restartedAtAnnotations, err := b.getCoreDNSRestartedAtAnnotations(ctx)
if err != nil {
return err
}
b.Shoot.Components.SystemComponents.CoreDNS.SetNodeNetworkCIDR(b.Shoot.GetInfo().Spec.Networking.Nodes)
b.Shoot.Components.SystemComponents.CoreDNS.SetPodAnnotations(restartedAtAnnotations)
return b.Shoot.Components.SystemComponents.CoreDNS.Deploy(ctx)
}
// NowFunc is a function returning the current time.
// Exposed for testing.
var NowFunc = time.Now
func (b *Botanist) getCoreDNSRestartedAtAnnotations(ctx context.Context) (map[string]string, error) {
const key = "gardener.cloud/restarted-at"
if controllerutils.HasTask(b.Shoot.GetInfo().Annotations, v1beta1constants.ShootTaskRestartCoreAddons) {
return map[string]string{key: NowFunc().UTC().Format(time.RFC3339)}, nil
}
deployment := &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: coredns.DeploymentName, Namespace: metav1.NamespaceSystem}}
if err := b.ShootClientSet.Client().Get(ctx, client.ObjectKeyFromObject(deployment), deployment); client.IgnoreNotFound(err) != nil {
return nil, err
}
if val, ok := deployment.Spec.Template.ObjectMeta.Annotations[key]; ok {
return map[string]string{key: val}, nil
}
return nil, nil
}
func getCommonSuffixesForRewriting(systemComponents *gardencorev1beta1.SystemComponents) []string {
if features.DefaultFeatureGate.Enabled(features.CoreDNSQueryRewriting) && systemComponents != nil && systemComponents.CoreDNS != nil && systemComponents.CoreDNS.Rewriting != nil {
return systemComponents.CoreDNS.Rewriting.CommonSuffixes
}
return []string{}
}