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kubeproxy.go
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kubeproxy.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"
"fmt"
"github.com/Masterminds/semver/v3"
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/ptr"
"github.com/gardener/gardener/imagevector"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
kubeproxy "github.com/gardener/gardener/pkg/component/kubernetes/proxy"
imagevectorutils "github.com/gardener/gardener/pkg/utils/imagevector"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
)
// DefaultKubeProxy returns a deployer for the kube-proxy.
func (b *Botanist) DefaultKubeProxy() (kubeproxy.Interface, error) {
imageAlpine, err := imagevector.ImageVector().FindImage(imagevector.ImageNameAlpineConntrack, imagevectorutils.RuntimeVersion(b.ShootVersion()), imagevectorutils.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.SeedClientSet.Client(),
b.Shoot.SeedNamespace,
kubeproxy.Values{
IPVSEnabled: b.Shoot.IPVSEnabled(),
FeatureGates: featureGates,
ImageAlpine: imageAlpine.String(),
PodNetworkCIDR: ptr.To(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, kubernetesutils.NewKubeconfig(
b.Shoot.SeedNamespace,
clientcmdv1.Cluster{
Server: b.Shoot.ComputeOutOfClusterAPIServerAddress(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 := v1beta1helper.CalculateEffectiveKubernetesVersion(b.Shoot.KubernetesVersion, worker.Kubernetes)
if err != nil {
return nil, err
}
image, err := imagevector.ImageVector().FindImage(imagevector.ImageNameKubeProxy, imagevectorutils.RuntimeVersion(kubernetesVersion.String()), imagevectorutils.TargetVersion(kubernetesVersion.String()))
if err != nil {
return nil, err
}
key := workerPoolKey(worker.Name, kubernetesVersion.String())
poolKeyToPoolInfo[key] = kubeproxy.WorkerPool{
Name: worker.Name,
KubernetesVersion: kubernetesVersion,
Image: image.String(),
}
}
nodeList := &corev1.NodeList{}
if err := b.ShootClientSet.Client().List(ctx, nodeList); err != nil {
return nil, err
}
for _, node := range nodeList.Items {
poolName, ok1 := node.Labels[v1beta1constants.LabelWorkerPool]
kubernetesVersionString, ok2 := node.Labels[v1beta1constants.LabelWorkerKubernetesVersion]
if !ok1 || !ok2 {
continue
}
kubernetesVersion, err := semver.NewVersion(kubernetesVersionString)
if err != nil {
return nil, err
}
image, err := imagevector.ImageVector().FindImage(imagevector.ImageNameKubeProxy, imagevectorutils.RuntimeVersion(kubernetesVersionString), imagevectorutils.TargetVersion(kubernetesVersionString))
if err != nil {
return nil, err
}
key := workerPoolKey(poolName, kubernetesVersionString)
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
}