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kubeproxy.go
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/
kubeproxy.go
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// Copyright (c) 2022 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"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeproxy"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/imagevector"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
clientcmdlatest "k8s.io/client-go/tools/clientcmd/api/latest"
clientcmdv1 "k8s.io/client-go/tools/clientcmd/api/v1"
"k8s.io/utils/pointer"
)
// DefaultKubeProxy returns a deployer for the kube-proxy.
func (b *Botanist) DefaultKubeProxy() (kubeproxy.Interface, error) {
imageAlpine, err := b.ImageVector.FindImage(images.ImageNameAlpine, imagevector.RuntimeVersion(b.ShootVersion()), imagevector.TargetVersion(b.ShootVersion()))
if err != nil {
return nil, err
}
var featureGates map[string]bool
if kubeProxyConfig := b.Shoot.GetInfo().Spec.Kubernetes.KubeProxy; kubeProxyConfig != nil {
featureGates = kubeProxyConfig.FeatureGates
}
return kubeproxy.New(
b.K8sSeedClient.Client(),
b.Shoot.SeedNamespace,
kubeproxy.Values{
IPVSEnabled: b.Shoot.IPVSEnabled(),
FeatureGates: featureGates,
ImageAlpine: imageAlpine.String(),
PodNetworkCIDR: pointer.String(b.Shoot.Networks.Pods.String()),
VPAEnabled: b.Shoot.WantsVerticalPodAutoscaler,
},
), nil
}
// DeployKubeProxy deploys the kube-proxy.
func (b *Botanist) DeployKubeProxy(ctx context.Context) error {
caSecret, found := b.SecretsManager.Get(v1beta1constants.SecretNameCACluster)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCACluster)
}
kubeconfig, err := runtime.Encode(clientcmdlatest.Codec, kutil.NewKubeconfig(
b.Shoot.SeedNamespace,
clientcmdv1.Cluster{
Server: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true),
CertificateAuthorityData: caSecret.Data[secrets.DataKeyCertificateBundle],
},
clientcmdv1.AuthInfo{TokenFile: "/var/run/secrets/kubernetes.io/serviceaccount/token"},
))
if err != nil {
return err
}
workerPools, err := b.computeWorkerPoolsForKubeProxy(ctx)
if err != nil {
return err
}
b.Shoot.Components.SystemComponents.KubeProxy.SetKubeconfig(kubeconfig)
b.Shoot.Components.SystemComponents.KubeProxy.SetWorkerPools(workerPools)
return b.Shoot.Components.SystemComponents.KubeProxy.Deploy(ctx)
}
func (b *Botanist) computeWorkerPoolsForKubeProxy(ctx context.Context) ([]kubeproxy.WorkerPool, error) {
poolKeyToPoolInfo := make(map[string]kubeproxy.WorkerPool)
for _, worker := range b.Shoot.GetInfo().Spec.Provider.Workers {
kubernetesVersion, err := gardencorev1beta1helper.CalculateEffectiveKubernetesVersion(b.Shoot.KubernetesVersion, worker.Kubernetes)
if err != nil {
return nil, err
}
image, err := b.ImageVector.FindImage(images.ImageNameKubeProxy, imagevector.RuntimeVersion(kubernetesVersion.String()), imagevector.TargetVersion(kubernetesVersion.String()))
if err != nil {
return nil, err
}
key := workerPoolKey(worker.Name, kubernetesVersion.String())
poolKeyToPoolInfo[key] = kubeproxy.WorkerPool{
Name: worker.Name,
KubernetesVersion: kubernetesVersion.String(),
Image: image.String(),
}
}
nodeList := &corev1.NodeList{}
if err := b.K8sShootClient.Client().List(ctx, nodeList); err != nil {
return nil, err
}
for _, node := range nodeList.Items {
poolName, ok1 := node.Labels[v1beta1constants.LabelWorkerPool]
kubernetesVersion, ok2 := node.Labels[v1beta1constants.LabelWorkerKubernetesVersion]
if !ok1 || !ok2 {
continue
}
image, err := b.ImageVector.FindImage(images.ImageNameKubeProxy, imagevector.RuntimeVersion(kubernetesVersion), imagevector.TargetVersion(kubernetesVersion))
if err != nil {
return nil, err
}
key := workerPoolKey(poolName, kubernetesVersion)
poolKeyToPoolInfo[key] = kubeproxy.WorkerPool{
Name: poolName,
KubernetesVersion: kubernetesVersion,
Image: image.String(),
}
}
var workerPools []kubeproxy.WorkerPool
for _, poolInfo := range poolKeyToPoolInfo {
workerPools = append(workerPools, poolInfo)
}
return workerPools, nil
}
func workerPoolKey(poolName, kubernetesVersion string) string {
return poolName + "@" + kubernetesVersion
}