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nodelocaldns.go
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nodelocaldns.go
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// Copyright (c) 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"
"strconv"
corev1 "k8s.io/api/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
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/operation/botanist/component/nodelocaldns"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/imagevector"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// DefaultNodeLocalDNS returns a deployer for the node-local-dns.
func (b *Botanist) DefaultNodeLocalDNS() (nodelocaldns.Interface, error) {
image, err := b.ImageVector.FindImage(images.ImageNameNodeLocalDns, imagevector.RuntimeVersion(b.ShootVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
// The node-local-dns interface cannot bind the kube-dns cluster IP since the interface
// used for IPVS load-balancing already uses this address.
clusterDNS := "__PILLAR__CLUSTER__DNS__"
dnsServer := ""
if b.Shoot.IPVSEnabled() {
clusterDNS = b.Shoot.Networks.CoreDNS.String()
} else {
dnsServer = b.Shoot.Networks.CoreDNS.String()
}
return nodelocaldns.New(
b.SeedClientSet.Client(),
b.Shoot.SeedNamespace,
nodelocaldns.Values{
Image: image.String(),
VPAEnabled: b.Shoot.WantsVerticalPodAutoscaler,
Config: v1beta1helper.GetNodeLocalDNS(b.Shoot.GetInfo().Spec.SystemComponents),
ShootAnnotations: b.Shoot.GetInfo().Annotations,
ClusterDNS: clusterDNS,
DNSServer: dnsServer,
PSPDisabled: b.Shoot.PSPDisabled,
KubernetesVersion: b.Shoot.KubernetesVersion,
},
), nil
}
// ReconcileNodeLocalDNS deploys or destroys the node-local-dns component depending on whether it is enabled for the Shoot.
func (b *Botanist) ReconcileNodeLocalDNS(ctx context.Context) error {
if b.Shoot.NodeLocalDNSEnabled {
return b.Shoot.Components.SystemComponents.NodeLocalDNS.Deploy(ctx)
}
if stillDesired, err := b.isNodeLocalDNSStillDesired(ctx); err != nil {
return err
} else if stillDesired {
// Leave NodeLocalDNS components in the cluster until all nodes have been rolled
return nil
}
return b.Shoot.Components.SystemComponents.NodeLocalDNS.Destroy(ctx)
}
// isNodeLocalDNSStillDesired indicates whether any node still requires node-local-dns components.
func (b *Botanist) isNodeLocalDNSStillDesired(ctx context.Context) (bool, error) {
return kubernetesutils.ResourcesExist(ctx, b.ShootClientSet.Client(), corev1.SchemeGroupVersion.WithKind("NodeList"), client.MatchingLabels{
v1beta1constants.LabelNodeLocalDNS: strconv.FormatBool(true),
})
}