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deployment.go
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deployment.go
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// Copyright 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 kubeapiserver
import (
"context"
"fmt"
"strconv"
"strings"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/intstr"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/utils/pointer"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"github.com/gardener/gardener/pkg/component/apiserver"
"github.com/gardener/gardener/pkg/component/etcd"
etcdconstants "github.com/gardener/gardener/pkg/component/etcd/constants"
kubeapiserverconstants "github.com/gardener/gardener/pkg/component/kubeapiserver/constants"
"github.com/gardener/gardener/pkg/component/vpnseedserver"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/resourcemanager/controller/garbagecollector/references"
"github.com/gardener/gardener/pkg/utils"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
"github.com/gardener/gardener/pkg/utils/version"
)
const (
secretNameServerCert = "kube-apiserver"
secretNameKubeAPIServerToKubelet = "kube-apiserver-kubelet"
secretNameKubeAggregator = "kube-aggregator"
secretNameHTTPProxy = "kube-apiserver-http-proxy"
secretNameHAVPNSeedClient = "vpn-seed-client"
// ContainerNameKubeAPIServer is the name of the kube-apiserver container.
ContainerNameKubeAPIServer = "kube-apiserver"
containerNameVPNSeedClient = "vpn-client"
containerNameWatchdog = "watchdog"
volumeNameAuthenticationWebhookKubeconfig = "authentication-webhook-kubeconfig"
volumeNameAuthorizationWebhookKubeconfig = "authorization-webhook-kubeconfig"
volumeNameCA = "ca"
volumeNameCAClient = "ca-client"
volumeNameCAFrontProxy = "ca-front-proxy"
volumeNameCAKubelet = "ca-kubelet"
volumeNameCAVPN = "ca-vpn"
volumeNameEgressSelector = "egress-selection-config"
volumeNameHTTPProxy = "http-proxy"
volumeNameKubeAPIServerToKubelet = "kubelet-client"
volumeNameKubeAggregator = "kube-aggregator"
volumeNameOIDCCABundle = "oidc-cabundle"
volumeNameServiceAccountKey = "service-account-key"
volumeNameServiceAccountKeyBundle = "service-account-key-bundle"
volumeNameStaticToken = "static-token"
volumeNamePrefixTLSSNISecret = "tls-sni-"
volumeNameVPNSeedClient = "vpn-seed-client"
volumeNameAPIServerAccess = "kube-api-access-gardener"
volumeNameVPNSeedTLSAuth = "vpn-seed-tlsauth"
volumeNameDevNetTun = "dev-net-tun"
volumeNameFedora = "fedora-rhel6-openelec-cabundle"
volumeNameCentOS = "centos-rhel7-cabundle"
volumeNameEtcSSL = "etc-ssl"
volumeNameUsrShareCaCerts = "usr-share-cacerts"
volumeNameWatchdog = "watchdog"
volumeMountPathAuthenticationWebhookKubeconfig = "/etc/kubernetes/webhook/authentication"
volumeMountPathAuthorizationWebhookKubeconfig = "/etc/kubernetes/webhook/authorization"
volumeMountPathCA = "/srv/kubernetes/ca"
volumeMountPathCAClient = "/srv/kubernetes/ca-client"
volumeMountPathCAFrontProxy = "/srv/kubernetes/ca-front-proxy"
volumeMountPathCAKubelet = "/srv/kubernetes/ca-kubelet"
volumeMountPathCAVPN = "/srv/kubernetes/ca-vpn"
volumeMountPathEgressSelector = "/etc/kubernetes/egress"
volumeMountPathHTTPProxy = "/etc/srv/kubernetes/envoy"
volumeMountPathKubeAPIServerToKubelet = "/srv/kubernetes/apiserver-kubelet"
volumeMountPathKubeAggregator = "/srv/kubernetes/aggregator"
volumeMountPathOIDCCABundle = "/srv/kubernetes/oidc"
volumeMountPathServiceAccountKey = "/srv/kubernetes/service-account-key"
volumeMountPathServiceAccountKeyBundle = "/srv/kubernetes/service-account-key-bundle"
volumeMountPathStaticToken = "/srv/kubernetes/token"
volumeMountPathPrefixTLSSNISecret = "/srv/kubernetes/tls-sni/"
volumeMountPathVPNSeedClient = "/srv/secrets/vpn-client"
volumeMountPathAPIServerAccess = "/var/run/secrets/kubernetes.io/serviceaccount"
volumeMountPathVPNSeedTLSAuth = "/srv/secrets/tlsauth"
volumeMountPathDevNetTun = "/dev/net/tun"
volumeMountPathFedora = "/etc/pki/tls"
volumeMountPathCentOS = "/etc/pki/ca-trust/extracted/pem"
volumeMountPathEtcSSL = "/etc/ssl"
volumeMountPathUsrShareCaCerts = "/usr/share/ca-certificates"
volumeMountPathWatchdog = "/var/watchdog/bin"
)
func (k *kubeAPIServer) emptyDeployment() *appsv1.Deployment {
return &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: k.values.NamePrefix + v1beta1constants.DeploymentNameKubeAPIServer, Namespace: k.namespace}}
}
func (k *kubeAPIServer) reconcileDeployment(
ctx context.Context,
deployment *appsv1.Deployment,
serviceAccount *corev1.ServiceAccount,
configMapAuditPolicy *corev1.ConfigMap,
configMapAdmissionConfigs *corev1.ConfigMap,
secretAdmissionKubeconfigs *corev1.Secret,
configMapEgressSelector *corev1.ConfigMap,
configMapTerminationHandler *corev1.ConfigMap,
secretETCDEncryptionConfiguration *corev1.Secret,
secretOIDCCABundle *corev1.Secret,
secretServiceAccountKey *corev1.Secret,
secretStaticToken *corev1.Secret,
secretServer *corev1.Secret,
secretKubeletClient *corev1.Secret,
secretKubeAggregator *corev1.Secret,
secretHTTPProxy *corev1.Secret,
secretHAVPNSeedClient *corev1.Secret,
secretHAVPNSeedClientSeedTLSAuth *corev1.Secret,
secretAuditWebhookKubeconfig *corev1.Secret,
secretAuthenticationWebhookKubeconfig *corev1.Secret,
secretAuthorizationWebhookKubeconfig *corev1.Secret,
tlsSNISecrets []tlsSNISecret,
) error {
var (
maxSurge = intstr.FromString("25%")
maxUnavailable = intstr.FromInt(0)
)
var healthCheckToken string
if secretStaticToken != nil {
staticToken, err := secrets.LoadStaticTokenFromCSV(SecretStaticTokenName, secretStaticToken.Data[secrets.DataKeyStaticTokenCSV])
if err != nil {
return err
}
token, err := staticToken.GetTokenForUsername(userNameHealthCheck)
if err != nil {
return err
}
healthCheckToken = token.Token
}
secretCACluster, found := k.secretsManager.Get(v1beta1constants.SecretNameCACluster)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCACluster)
}
secretCAClient, found := k.secretsManager.Get(v1beta1constants.SecretNameCAClient)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCAClient)
}
secretCAFrontProxy, found := k.secretsManager.Get(v1beta1constants.SecretNameCAFrontProxy)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCAFrontProxy)
}
secretCAETCD, found := k.secretsManager.Get(v1beta1constants.SecretNameCAETCD)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCAETCD)
}
secretETCDClient, found := k.secretsManager.Get(etcd.SecretNameClient)
if !found {
return fmt.Errorf("secret %q not found", etcd.SecretNameClient)
}
secretServiceAccountKeyBundle, found := k.secretsManager.Get(v1beta1constants.SecretNameServiceAccountKey, secretsmanager.Bundle)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameServiceAccountKey)
}
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, k.client.Client(), deployment, func() error {
deployment.Labels = utils.MergeStringMaps(GetLabels(), map[string]string{
resourcesv1alpha1.HighAvailabilityConfigType: resourcesv1alpha1.HighAvailabilityConfigTypeServer,
})
deployment.Spec = appsv1.DeploymentSpec{
MinReadySeconds: 30,
RevisionHistoryLimit: pointer.Int32(2),
Replicas: k.values.Autoscaling.Replicas,
Selector: &metav1.LabelSelector{MatchLabels: getLabels()},
Strategy: appsv1.DeploymentStrategy{
Type: appsv1.RollingUpdateDeploymentStrategyType,
RollingUpdate: &appsv1.RollingUpdateDeployment{
MaxSurge: &maxSurge,
MaxUnavailable: &maxUnavailable,
},
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: utils.MergeStringMaps(GetLabels(), map[string]string{
v1beta1constants.LabelNetworkPolicyToDNS: v1beta1constants.LabelNetworkPolicyAllowed,
v1beta1constants.LabelNetworkPolicyToPublicNetworks: v1beta1constants.LabelNetworkPolicyAllowed,
v1beta1constants.LabelNetworkPolicyToPrivateNetworks: v1beta1constants.LabelNetworkPolicyAllowed,
"networking.resources.gardener.cloud/to-" + v1beta1constants.LabelNetworkPolicyWebhookTargets: v1beta1constants.LabelNetworkPolicyAllowed,
"networking.resources.gardener.cloud/to-" + v1beta1constants.LabelNetworkPolicyExtensionsNamespaceAlias + "-" + v1beta1constants.LabelNetworkPolicyWebhookTargets: v1beta1constants.LabelNetworkPolicyAllowed,
gardenerutils.NetworkPolicyLabel(k.values.NamePrefix+etcdconstants.ServiceName(v1beta1constants.ETCDRoleMain), etcdconstants.PortEtcdClient): v1beta1constants.LabelNetworkPolicyAllowed,
gardenerutils.NetworkPolicyLabel(k.values.NamePrefix+etcdconstants.ServiceName(v1beta1constants.ETCDRoleEvents), etcdconstants.PortEtcdClient): v1beta1constants.LabelNetworkPolicyAllowed,
}),
},
Spec: corev1.PodSpec{
AutomountServiceAccountToken: pointer.Bool(false),
PriorityClassName: k.values.PriorityClassName,
DNSPolicy: corev1.DNSClusterFirst,
RestartPolicy: corev1.RestartPolicyAlways,
SchedulerName: corev1.DefaultSchedulerName,
TerminationGracePeriodSeconds: pointer.Int64(30),
Containers: []corev1.Container{{
Name: ContainerNameKubeAPIServer,
Image: k.values.Images.KubeAPIServer,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: []string{"/usr/local/bin/kube-apiserver"},
Args: k.computeKubeAPIServerArgs(),
TerminationMessagePath: corev1.TerminationMessagePathDefault,
TerminationMessagePolicy: corev1.TerminationMessageReadFile,
Ports: []corev1.ContainerPort{{
Name: "https",
ContainerPort: kubeapiserverconstants.Port,
Protocol: corev1.ProtocolTCP,
}},
Resources: k.values.Autoscaling.APIServerResources,
LivenessProbe: &corev1.Probe{
ProbeHandler: corev1.ProbeHandler{
HTTPGet: &corev1.HTTPGetAction{
Path: "/livez",
Scheme: corev1.URISchemeHTTPS,
Port: intstr.FromInt(kubeapiserverconstants.Port),
HTTPHeaders: []corev1.HTTPHeader{{
Name: "Authorization",
Value: "Bearer " + healthCheckToken,
}},
},
},
SuccessThreshold: 1,
FailureThreshold: 3,
InitialDelaySeconds: 15,
PeriodSeconds: 10,
TimeoutSeconds: 15,
},
ReadinessProbe: &corev1.Probe{
ProbeHandler: corev1.ProbeHandler{
HTTPGet: &corev1.HTTPGetAction{
Path: "/readyz",
Scheme: corev1.URISchemeHTTPS,
Port: intstr.FromInt(kubeapiserverconstants.Port),
HTTPHeaders: []corev1.HTTPHeader{{
Name: "Authorization",
Value: "Bearer " + healthCheckToken,
}},
},
},
SuccessThreshold: 1,
FailureThreshold: 3,
InitialDelaySeconds: 10,
PeriodSeconds: 10,
TimeoutSeconds: 15,
},
VolumeMounts: []corev1.VolumeMount{
{
Name: volumeNameCA,
MountPath: volumeMountPathCA,
},
{
Name: volumeNameCAClient,
MountPath: volumeMountPathCAClient,
},
{
Name: volumeNameCAFrontProxy,
MountPath: volumeMountPathCAFrontProxy,
},
{
Name: volumeNameServiceAccountKey,
MountPath: volumeMountPathServiceAccountKey,
},
{
Name: volumeNameServiceAccountKeyBundle,
MountPath: volumeMountPathServiceAccountKeyBundle,
},
{
Name: volumeNameStaticToken,
MountPath: volumeMountPathStaticToken,
},
{
Name: volumeNameKubeAggregator,
MountPath: volumeMountPathKubeAggregator,
},
},
}},
Volumes: []corev1.Volume{
{
Name: volumeNameCA,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretCACluster.Name,
},
},
},
{
Name: volumeNameCAClient,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretCAClient.Name,
},
},
},
{
Name: volumeNameCAFrontProxy,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretCAFrontProxy.Name,
},
},
},
{
Name: volumeNameServiceAccountKey,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretServiceAccountKey.Name,
},
},
},
{
Name: volumeNameServiceAccountKeyBundle,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretServiceAccountKeyBundle.Name,
},
},
},
{
Name: volumeNameStaticToken,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretStaticToken.Name,
},
},
},
{
Name: volumeNameKubeAggregator,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretKubeAggregator.Name,
},
},
},
},
},
},
}
apiserver.InjectDefaultSettings(deployment, k.values.NamePrefix, k.values.Values, k.values.Version, secretCAETCD, secretETCDClient, secretServer)
apiserver.InjectAuditSettings(deployment, configMapAuditPolicy, secretAuditWebhookKubeconfig, k.values.Audit)
apiserver.InjectAdmissionSettings(deployment, configMapAdmissionConfigs, secretAdmissionKubeconfigs, k.values.Values)
apiserver.InjectEncryptionSettings(deployment, secretETCDEncryptionConfiguration)
k.handleLifecycleSettings(deployment)
k.handleHostCertVolumes(deployment)
k.handleSNISettings(deployment)
k.handleTLSSNISettings(deployment, tlsSNISecrets)
k.handleOIDCSettings(deployment, secretOIDCCABundle)
k.handleServiceAccountSigningKeySettings(deployment)
k.handleAuthenticationSettings(deployment, secretAuthenticationWebhookKubeconfig)
k.handleAuthorizationSettings(deployment, secretAuthorizationWebhookKubeconfig)
if err := k.handleVPNSettings(deployment, serviceAccount, configMapEgressSelector, secretHTTPProxy, secretHAVPNSeedClient, secretHAVPNSeedClientSeedTLSAuth); err != nil {
return err
}
if err := k.handleKubeletSettings(deployment, secretKubeletClient); err != nil {
return err
}
if version.ConstraintK8sEqual124.Check(k.values.Version) {
// For kube-apiserver version 1.24 there is a deadlock that can occur during shutdown that prevents the
// graceful termination of the kube-apiserver container to complete when the --audit-log-mode setting
// is set to batch. For more information check
// https://github.com/gardener/gardener/blob/a63e23a27dabc6a25fb470128a52f8585cd136ff/pkg/operation/botanist/component/kubeapiserver/deployment.go#L677-L683
k.handleWatchdogSidecar(deployment, configMapTerminationHandler, healthCheckToken)
}
utilruntime.Must(references.InjectAnnotations(deployment))
return nil
})
return err
}
func (k *kubeAPIServer) computeKubeAPIServerArgs() []string {
var out []string
out = append(out, "--anonymous-auth="+strconv.FormatBool(k.values.AnonymousAuthenticationEnabled))
if len(k.values.APIAudiences) > 0 {
out = append(out, "--api-audiences="+strings.Join(k.values.APIAudiences, ","))
}
out = append(out, fmt.Sprintf("--client-ca-file=%s/%s", volumeMountPathCAClient, secrets.DataKeyCertificateBundle))
out = append(out, "--enable-aggregator-routing=true")
out = append(out, "--enable-bootstrap-token-auth=true")
out = append(out, "--etcd-servers-overrides="+k.etcdServersOverrides())
out = append(out, "--external-hostname="+k.values.ExternalHostname)
if k.values.DefaultNotReadyTolerationSeconds != nil {
out = append(out, fmt.Sprintf("--default-not-ready-toleration-seconds=%d", *k.values.DefaultNotReadyTolerationSeconds))
}
if k.values.DefaultUnreachableTolerationSeconds != nil {
out = append(out, fmt.Sprintf("--default-unreachable-toleration-seconds=%d", *k.values.DefaultUnreachableTolerationSeconds))
}
if k.values.EventTTL != nil {
out = append(out, fmt.Sprintf("--event-ttl=%s", k.values.EventTTL.Duration))
}
if version.ConstraintK8sLess124.Check(k.values.Version) {
out = append(out, "--insecure-port=0")
}
out = append(out, fmt.Sprintf("--proxy-client-cert-file=%s/%s", volumeMountPathKubeAggregator, secrets.DataKeyCertificate))
out = append(out, fmt.Sprintf("--proxy-client-key-file=%s/%s", volumeMountPathKubeAggregator, secrets.DataKeyPrivateKey))
out = append(out, fmt.Sprintf("--requestheader-client-ca-file=%s/%s", volumeMountPathCAFrontProxy, secrets.DataKeyCertificateBundle))
out = append(out, "--requestheader-extra-headers-prefix=X-Remote-Extra-")
out = append(out, "--requestheader-group-headers=X-Remote-Group")
out = append(out, "--requestheader-username-headers=X-Remote-User")
if k.values.IsWorkerless {
disableAPIs := map[string]bool{
"autoscaling/v2": false,
"batch/v1": false,
"apps/v1": false,
"policy/v1/poddisruptionbudgets": false,
"storage.k8s.io/v1/csidrivers": false,
"storage.k8s.io/v1/csinodes": false,
}
if version.ConstraintK8sLess125.Check(k.values.Version) {
disableAPIs["policy/v1beta1/podsecuritypolicies"] = false
}
// Allow users to explicitly enable disabled APIs via RuntimeConfig.
k.values.RuntimeConfig = utils.MergeStringMaps(disableAPIs, k.values.RuntimeConfig)
}
if k.values.RuntimeConfig != nil {
out = append(out, kubernetesutils.MapStringBoolToCommandLineParameter(k.values.RuntimeConfig, "--runtime-config="))
}
out = append(out, "--service-account-issuer="+k.values.ServiceAccount.Issuer)
for _, issuer := range k.values.ServiceAccount.AcceptedIssuers {
out = append(out, fmt.Sprintf("--service-account-issuer=%s", issuer))
}
if k.values.ServiceAccount.ExtendTokenExpiration != nil {
out = append(out, fmt.Sprintf("--service-account-extend-token-expiration=%s", strconv.FormatBool(*k.values.ServiceAccount.ExtendTokenExpiration)))
}
if k.values.ServiceAccount.MaxTokenExpiration != nil {
out = append(out, fmt.Sprintf("--service-account-max-token-expiration=%s", k.values.ServiceAccount.MaxTokenExpiration.Duration))
}
out = append(out, fmt.Sprintf("--service-cluster-ip-range=%s", k.values.ServiceNetworkCIDR))
out = append(out, fmt.Sprintf("--secure-port=%d", kubeapiserverconstants.Port))
out = append(out, fmt.Sprintf("--token-auth-file=%s/%s", volumeMountPathStaticToken, secrets.DataKeyStaticTokenCSV))
return out
}
func (k *kubeAPIServer) etcdServersOverrides() string {
addGroupResourceIfNotPresent := func(groupResources []schema.GroupResource, groupResource schema.GroupResource) []schema.GroupResource {
for _, resource := range groupResources {
if resource.Group == groupResource.Group && resource.Resource == groupResource.Resource {
return groupResources
}
}
return append([]schema.GroupResource{groupResource}, groupResources...)
}
var overrides []string
for _, resource := range addGroupResourceIfNotPresent(k.values.ResourcesToStoreInETCDEvents, schema.GroupResource{Resource: "events"}) {
overrides = append(overrides, fmt.Sprintf("%s/%s#https://%s%s:%d", resource.Group, resource.Resource, k.values.NamePrefix, etcdconstants.ServiceName(v1beta1constants.ETCDRoleEvents), etcdconstants.PortEtcdClient))
}
return strings.Join(overrides, ",")
}
func (k *kubeAPIServer) handleHostCertVolumes(deployment *appsv1.Deployment) {
directoryOrCreate := corev1.HostPathDirectoryOrCreate
// locations are taken from
// https://github.com/golang/go/blob/1bb247a469e306c57a5e0eaba788efb8b3b1acef/src/crypto/x509/root_linux.go#L7-L15
// we cannot be sure on which Node OS the Seed Cluster is running so, it's safer to mount them all
deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, []corev1.VolumeMount{
{
Name: volumeNameFedora,
MountPath: volumeMountPathFedora,
ReadOnly: true,
},
{
Name: volumeNameCentOS,
MountPath: volumeMountPathCentOS,
ReadOnly: true,
},
{
Name: volumeNameEtcSSL,
MountPath: volumeMountPathEtcSSL,
ReadOnly: true,
},
{
Name: volumeNameUsrShareCaCerts,
MountPath: volumeMountPathUsrShareCaCerts,
ReadOnly: true,
},
}...)
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, []corev1.Volume{
{
Name: volumeNameFedora,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: volumeMountPathFedora,
Type: &directoryOrCreate,
},
},
},
{
Name: volumeNameCentOS,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: volumeMountPathCentOS,
Type: &directoryOrCreate,
},
},
},
{
Name: volumeNameEtcSSL,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: volumeMountPathEtcSSL,
Type: &directoryOrCreate,
},
},
},
{
Name: volumeNameUsrShareCaCerts,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: volumeMountPathUsrShareCaCerts,
Type: &directoryOrCreate,
},
},
},
}...)
}
func (k *kubeAPIServer) handleSNISettings(deployment *appsv1.Deployment) {
if !k.values.SNI.Enabled {
return
}
deployment.Labels[v1beta1constants.LabelAPIServerExposure] = v1beta1constants.LabelAPIServerExposureGardenerManaged
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, fmt.Sprintf("--advertise-address=%s", k.values.SNI.AdvertiseAddress))
}
func (k *kubeAPIServer) handleTLSSNISettings(deployment *appsv1.Deployment, tlsSNISecrets []tlsSNISecret) {
for i, sni := range tlsSNISecrets {
var (
volumeName = fmt.Sprintf("%s%d", volumeNamePrefixTLSSNISecret, i)
volumeMountPath = fmt.Sprintf("%s%d", volumeMountPathPrefixTLSSNISecret, i)
flag = fmt.Sprintf("--tls-sni-cert-key=%s/tls.crt,%s/tls.key", volumeMountPath, volumeMountPath)
)
if len(sni.domainPatterns) > 0 {
flag += ":" + strings.Join(sni.domainPatterns, ",")
}
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, flag)
deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, corev1.VolumeMount{
Name: volumeName,
MountPath: volumeMountPath,
ReadOnly: true,
})
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, corev1.Volume{
Name: volumeName,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: sni.secretName,
},
},
})
}
}
func (k *kubeAPIServer) handleLifecycleSettings(deployment *appsv1.Deployment) {
// For kube-apiserver version 1.24 there is a deadlock that can occur during shutdown that prevents the graceful termination
// of the kube-apiserver container to complete when the --audit-log-mode setting is set to batch. Open TCP connections to that
// kube-apiserver are not terminated and clients will keep receiving an error that the kube-apiserver is shutting down which leads
// to various problems, e.g. nodes becoming not ready. By setting --shutdown-send-retry-after=true, we instruct the kube-apiserver
// to send a response with `Connection: close` and `Retry-After: N` headers during the graceful termination and thus all new
// requests will have their connections closed and eventually be reopened to healthy kube-apiservers.
// TODO: Once https://github.com/kubernetes/kubernetes/pull/113741 is merged this setting can be removed.
if version.ConstraintK8sEqual124.Check(k.values.Version) {
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, "--shutdown-send-retry-after=true")
}
}
func (k *kubeAPIServer) handleVPNSettings(
deployment *appsv1.Deployment,
serviceAccount *corev1.ServiceAccount,
configMapEgressSelector *corev1.ConfigMap,
secretHTTPProxy *corev1.Secret,
secretHAVPNSeedClient *corev1.Secret,
secretHAVPNSeedClientSeedTLSAuth *corev1.Secret,
) error {
if !k.values.VPN.Enabled {
return nil
}
secretCAVPN, found := k.secretsManager.Get(v1beta1constants.SecretNameCAVPN)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameCAVPN)
}
if k.values.VPN.HighAvailabilityEnabled {
k.handleVPNSettingsHA(deployment, serviceAccount, secretCAVPN, secretHAVPNSeedClient, secretHAVPNSeedClientSeedTLSAuth)
} else {
k.handleVPNSettingsNonHA(deployment, secretCAVPN, secretHTTPProxy, configMapEgressSelector)
}
return nil
}
func (k *kubeAPIServer) handleVPNSettingsNonHA(
deployment *appsv1.Deployment,
secretCAVPN *corev1.Secret,
secretHTTPProxy *corev1.Secret,
configMapEgressSelector *corev1.ConfigMap,
) {
deployment.Spec.Template.Labels = utils.MergeStringMaps(deployment.Spec.Template.Labels, map[string]string{
gardenerutils.NetworkPolicyLabel(vpnseedserver.ServiceName, vpnseedserver.EnvoyPort): v1beta1constants.LabelNetworkPolicyAllowed,
})
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, fmt.Sprintf("--egress-selector-config-file=%s/%s", volumeMountPathEgressSelector, configMapEgressSelectorDataKey))
deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, []corev1.VolumeMount{
{
Name: volumeNameCAVPN,
MountPath: volumeMountPathCAVPN,
},
{
Name: volumeNameHTTPProxy,
MountPath: volumeMountPathHTTPProxy,
},
{
Name: volumeNameEgressSelector,
MountPath: volumeMountPathEgressSelector,
},
}...)
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, []corev1.Volume{
{
Name: volumeNameCAVPN,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretCAVPN.Name,
},
},
},
{
Name: volumeNameHTTPProxy,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretHTTPProxy.Name,
},
},
},
{
Name: volumeNameEgressSelector,
VolumeSource: corev1.VolumeSource{
ConfigMap: &corev1.ConfigMapVolumeSource{
LocalObjectReference: corev1.LocalObjectReference{
Name: configMapEgressSelector.Name,
},
},
},
},
}...)
}
func (k *kubeAPIServer) handleVPNSettingsHA(
deployment *appsv1.Deployment,
serviceAccount *corev1.ServiceAccount,
secretCAVPN *corev1.Secret,
secretHAVPNSeedClient *corev1.Secret,
secretHAVPNSeedClientSeedTLSAuth *corev1.Secret,
) {
for i := 0; i < k.values.VPN.HighAvailabilityNumberOfSeedServers; i++ {
serviceName := fmt.Sprintf("%s-%d", vpnseedserver.ServiceName, i)
deployment.Spec.Template.Labels = utils.MergeStringMaps(deployment.Spec.Template.Labels, map[string]string{
gardenerutils.NetworkPolicyLabel(serviceName, vpnseedserver.OpenVPNPort): v1beta1constants.LabelNetworkPolicyAllowed,
})
}
deployment.Spec.Template.Spec.ServiceAccountName = serviceAccount.Name
deployment.Spec.Template.Labels[v1beta1constants.LabelNetworkPolicyToShootNetworks] = v1beta1constants.LabelNetworkPolicyAllowed
deployment.Spec.Template.Labels[v1beta1constants.LabelNetworkPolicyToRuntimeAPIServer] = v1beta1constants.LabelNetworkPolicyAllowed
for i := 0; i < k.values.VPN.HighAvailabilityNumberOfSeedServers; i++ {
deployment.Spec.Template.Spec.Containers = append(deployment.Spec.Template.Spec.Containers, *k.vpnSeedClientContainer(i))
}
deployment.Spec.Template.Spec.Containers = append(deployment.Spec.Template.Spec.Containers, *k.vpnSeedPathControllerContainer())
container := *k.vpnSeedClientContainer(0)
container.Name = "vpn-client-init"
container.Env = append(container.Env, []corev1.EnvVar{
{
Name: "CONFIGURE_BONDING",
Value: "true",
},
{
Name: "EXIT_AFTER_CONFIGURING_KERNEL_SETTINGS",
Value: "true",
},
{
Name: "POD_NAME",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
FieldPath: "metadata.name",
},
},
},
{
Name: "NAMESPACE",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
FieldPath: "metadata.namespace",
},
},
},
}...)
container.LivenessProbe = nil
container.VolumeMounts = append(container.VolumeMounts, corev1.VolumeMount{
Name: volumeNameAPIServerAccess,
MountPath: volumeMountPathAPIServerAccess,
ReadOnly: true,
})
deployment.Spec.Template.Spec.InitContainers = append(deployment.Spec.Template.Spec.InitContainers, container)
hostPathCharDev := corev1.HostPathCharDev
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, []corev1.Volume{
{
Name: volumeNameAPIServerAccess,
VolumeSource: corev1.VolumeSource{
Projected: &corev1.ProjectedVolumeSource{
DefaultMode: pointer.Int32(420),
Sources: []corev1.VolumeProjection{
{
ServiceAccountToken: &corev1.ServiceAccountTokenProjection{
ExpirationSeconds: pointer.Int64(60 * 60 * 12),
Path: "token",
},
},
{
ConfigMap: &corev1.ConfigMapProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: "kube-root-ca.crt",
},
Items: []corev1.KeyToPath{{
Key: "ca.crt",
Path: "ca.crt",
}},
},
},
{
DownwardAPI: &corev1.DownwardAPIProjection{
Items: []corev1.DownwardAPIVolumeFile{{
FieldRef: &corev1.ObjectFieldSelector{
APIVersion: "v1",
FieldPath: "metadata.namespace",
},
Path: "namespace",
}},
},
},
},
},
},
},
{
Name: volumeNameVPNSeedClient,
VolumeSource: corev1.VolumeSource{
Projected: &corev1.ProjectedVolumeSource{
DefaultMode: pointer.Int32(400),
Sources: []corev1.VolumeProjection{
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: secretCAVPN.Name,
},
Items: []corev1.KeyToPath{{
Key: secrets.DataKeyCertificateBundle,
Path: secrets.DataKeyCertificateCA,
}},
},
},
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: secretHAVPNSeedClient.Name,
},
Items: []corev1.KeyToPath{
{
Key: secrets.DataKeyCertificate,
Path: secrets.DataKeyCertificate,
},
{
Key: secrets.DataKeyPrivateKey,
Path: secrets.DataKeyPrivateKey,
},
},
},
},
},
},
},
},
{
Name: volumeNameVPNSeedTLSAuth,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{SecretName: secretHAVPNSeedClientSeedTLSAuth.Name},
},
},
{
Name: volumeNameDevNetTun,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: volumeMountPathDevNetTun,
Type: &hostPathCharDev,
},
},
},
}...)
}
func (k *kubeAPIServer) vpnSeedClientContainer(index int) *corev1.Container {
container := &corev1.Container{
Name: fmt.Sprintf("%s-%d", containerNameVPNSeedClient, index),
Image: k.values.Images.VPNClient,
ImagePullPolicy: corev1.PullIfNotPresent,
Env: []corev1.EnvVar{
{
Name: "ENDPOINT",
Value: fmt.Sprintf("vpn-seed-server-%d", index),
},
{
Name: "SERVICE_NETWORK",
Value: k.values.ServiceNetworkCIDR,
},
{
Name: "POD_NETWORK",
Value: k.values.VPN.PodNetworkCIDR,
},
{
Name: "NODE_NETWORK",
Value: pointer.StringDeref(k.values.VPN.NodeNetworkCIDR, ""),
},
{
Name: "VPN_SERVER_INDEX",
Value: fmt.Sprintf("%d", index),
},
{
Name: "HA_VPN_SERVERS",
Value: fmt.Sprintf("%d", k.values.VPN.HighAvailabilityNumberOfSeedServers),
},
{
Name: "HA_VPN_CLIENTS",
Value: fmt.Sprintf("%d", k.values.VPN.HighAvailabilityNumberOfShootClients),
},
{
Name: "OPENVPN_PORT",
Value: strconv.Itoa(vpnseedserver.OpenVPNPort),
},
{
Name: "DO_NOT_CONFIGURE_KERNEL_SETTINGS",
Value: "true",
},
},
Resources: corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("100m"),
corev1.ResourceMemory: resource.MustParse("100Mi"),
},
Limits: corev1.ResourceList{
corev1.ResourceMemory: resource.MustParse("100Mi"),
},
},
SecurityContext: &corev1.SecurityContext{
Capabilities: &corev1.Capabilities{
Add: []corev1.Capability{"NET_ADMIN"},
},
},
TerminationMessagePath: corev1.TerminationMessagePathDefault,
TerminationMessagePolicy: corev1.TerminationMessageReadFile,
VolumeMounts: []corev1.VolumeMount{
{
Name: volumeNameVPNSeedClient,
MountPath: volumeMountPathVPNSeedClient,
},
{
Name: volumeNameVPNSeedTLSAuth,
MountPath: volumeMountPathVPNSeedTLSAuth,
},
{
Name: volumeNameDevNetTun,
MountPath: volumeMountPathDevNetTun,
},
},
}
return container
}
func (k *kubeAPIServer) vpnSeedPathControllerContainer() *corev1.Container {
container := &corev1.Container{
Name: "vpn-path-controller",
Image: k.values.Images.VPNClient,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: []string{"/path-controller.sh"},
Env: []corev1.EnvVar{
{
Name: "SERVICE_NETWORK",
Value: k.values.ServiceNetworkCIDR,
},
{
Name: "POD_NETWORK",
Value: k.values.VPN.PodNetworkCIDR,
},
{
Name: "NODE_NETWORK",
Value: pointer.StringDeref(k.values.VPN.NodeNetworkCIDR, ""),
},
{
Name: "HA_VPN_CLIENTS",
Value: fmt.Sprintf("%d", k.values.VPN.HighAvailabilityNumberOfShootClients),
},
},
Resources: corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("10m"),
corev1.ResourceMemory: resource.MustParse("20Mi"),
},
Limits: corev1.ResourceList{
corev1.ResourceMemory: resource.MustParse("50Mi"),
},
},
SecurityContext: &corev1.SecurityContext{
Capabilities: &corev1.Capabilities{
Add: []corev1.Capability{"NET_ADMIN"},
},
},
TerminationMessagePath: corev1.TerminationMessagePathDefault,
TerminationMessagePolicy: corev1.TerminationMessageReadFile,
}
return container
}
func (k *kubeAPIServer) handleOIDCSettings(deployment *appsv1.Deployment, secretOIDCCABundle *corev1.Secret) {
if k.values.OIDC == nil {
return
}
if k.values.OIDC.CABundle != nil {
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, fmt.Sprintf("--oidc-ca-file=%s/%s", volumeMountPathOIDCCABundle, secretOIDCCABundleDataKeyCaCrt))
deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, []corev1.VolumeMount{
{
Name: volumeNameOIDCCABundle,
MountPath: volumeMountPathOIDCCABundle,
},
}...)
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, []corev1.Volume{
{
Name: volumeNameOIDCCABundle,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: secretOIDCCABundle.Name,
},
},
},
}...)
}
if v := k.values.OIDC.IssuerURL; v != nil {
deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, "--oidc-issuer-url="+*v)
}