/
kube_apiserver_service.go
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/
kube_apiserver_service.go
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// Copyright (c) 2020 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 controlplane
import (
"context"
"fmt"
"path/filepath"
"time"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/operation/botanist/component"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/retry"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
kubeAPIServerChartName = "kube-apiserver-service"
)
// KubeAPIServiceValues configure the kube-apiserver service.
type KubeAPIServiceValues struct {
Annotations map[string]string
KonnectivityTunnelEnabled bool
SNIPhase component.Phase
}
// NewKubeAPIService creates a new instance of DeployWaiter for a specific DNS entry.
// <waiter> is optional and it's defaulted to github.com/gardener/gardener/pkg/utils/retry.DefaultOps().
func NewKubeAPIService(
values *KubeAPIServiceValues,
serviceKey client.ObjectKey,
sniServiceKey client.ObjectKey,
applier kubernetes.ChartApplier,
chartsRootPath string,
logger logrus.FieldLogger,
crclient client.Client,
waiter retry.Ops,
clusterIPFunc func(clusterIP string),
ingressFunc func(ingressIP string),
) component.DeployWaiter {
var loadBalancerServiceKey client.ObjectKey
if waiter == nil {
waiter = retry.DefaultOps()
}
if clusterIPFunc == nil {
clusterIPFunc = func(_ string) {}
}
if ingressFunc == nil {
ingressFunc = func(_ string) {}
}
internalValues := &kubeAPIServiceValues{
Name: serviceKey.Name,
}
if values != nil {
switch values.SNIPhase {
case component.PhaseEnabled:
internalValues.ServiceType = corev1.ServiceTypeClusterIP
internalValues.EnableSNI = true
internalValues.GardenerManaged = true
loadBalancerServiceKey = sniServiceKey
case component.PhaseEnabling:
// existing traffic must still access the old loadbalancer
// IP (due to DNS cache).
internalValues.ServiceType = corev1.ServiceTypeLoadBalancer
internalValues.EnableSNI = true
internalValues.GardenerManaged = false
loadBalancerServiceKey = sniServiceKey
case component.PhaseDisabling:
internalValues.ServiceType = corev1.ServiceTypeLoadBalancer
internalValues.EnableSNI = true
internalValues.GardenerManaged = true
loadBalancerServiceKey = serviceKey
default:
internalValues.ServiceType = corev1.ServiceTypeLoadBalancer
internalValues.EnableSNI = false
internalValues.GardenerManaged = false
loadBalancerServiceKey = serviceKey
}
internalValues.Annotations = values.Annotations
internalValues.EnableKonnectivityTunnel = values.KonnectivityTunnelEnabled
}
return &kubeAPIService{
ChartApplier: applier,
chartPath: filepath.Join(chartsRootPath, "seed-controlplane", "charts", kubeAPIServerChartName),
client: crclient,
logger: logger,
values: internalValues,
service: serviceKey,
loadBalancerServicekey: loadBalancerServiceKey,
waiter: waiter,
clusterIPFunc: clusterIPFunc,
ingressFunc: ingressFunc,
}
}
func (d *kubeAPIService) Deploy(ctx context.Context) error {
if err := d.Apply(
ctx,
d.chartPath,
d.service.Namespace,
kubeAPIServerChartName,
kubernetes.Values(d.values),
); err != nil {
return err
}
service := &corev1.Service{}
if err := d.client.Get(ctx, d.service, service); err != nil {
return err
}
d.clusterIPFunc(service.Spec.ClusterIP)
return nil
}
func (d *kubeAPIService) Destroy(ctx context.Context) error {
return client.IgnoreNotFound(d.client.Delete(ctx, d.getService()))
}
func (d *kubeAPIService) Wait(ctx context.Context) error {
ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
defer cancel()
return d.waiter.Until(ctx, 5*time.Second, func(ctx context.Context) (done bool, err error) {
// this ingress can be either the kube-apiserver's service or istio's IGW loadbalancer.
loadBalancerIngress, err := kutil.GetLoadBalancerIngress(
ctx,
d.client,
&corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: d.loadBalancerServicekey.Name, Namespace: d.loadBalancerServicekey.Namespace,
},
},
)
if err != nil {
d.logger.Info("Waiting until the KubeAPI Server ingress LoadBalancer deployed in the Seed cluster is ready...")
// TODO(AC): This is a quite optimistic check / we should differentiate here
return retry.MinorError(fmt.Errorf("KubeAPI Server ingress LoadBalancer deployed in the Seed cluster is ready: %v", err))
}
d.ingressFunc(loadBalancerIngress)
return retry.Ok()
})
}
func (d *kubeAPIService) WaitCleanup(ctx context.Context) error {
return kutil.WaitUntilResourceDeleted(ctx, d.client, d.getService(), 5*time.Second)
}
func (d *kubeAPIService) getService() *corev1.Service {
return &corev1.Service{ObjectMeta: metav1.ObjectMeta{Name: d.service.Name, Namespace: d.service.Namespace}}
}
// kubeAPIServiceValues configure the kube-apiserver service.
// this one is not exposed as not all values should be configured
// from the outside.
type kubeAPIServiceValues struct {
EnableSNI bool `json:"enableSNI,omitempty"`
EnableKonnectivityTunnel bool `json:"enableKonnectivityTunnel,omitempty"`
GardenerManaged bool `json:"gardenerManaged,omitempty"`
Name string `json:"name,omitempty"`
Annotations map[string]string `json:"annotations,omitempty"`
ServiceType corev1.ServiceType `json:"serviceType,omitempty"`
}
type kubeAPIService struct {
values *kubeAPIServiceValues
service client.ObjectKey
loadBalancerServicekey client.ObjectKey
kubernetes.ChartApplier
chartPath string
logger logrus.FieldLogger
client client.Client
waiter retry.Ops
clusterIPFunc func(clusterIP string)
ingressFunc func(ingressIP string)
}