/
waiter.go
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/
waiter.go
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// Copyright (c) 2018 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"
"errors"
"fmt"
"net"
"sync"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/retry"
druidv1alpha1 "github.com/gardener/etcd-druid/api/v1alpha1"
"github.com/hashicorp/go-multierror"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// WaitUntilNginxIngressServiceIsReady waits until the external load balancer of the nginx ingress controller has
// been created (i.e., its ingress information has been updated in the service status).
func (b *Botanist) WaitUntilNginxIngressServiceIsReady(ctx context.Context) error {
ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
defer cancel()
return retry.Until(ctx, 5*time.Second, func(ctx context.Context) (done bool, err error) {
loadBalancerIngress, err := kutil.GetLoadBalancerIngress(ctx, b.K8sShootClient.Client(), metav1.NamespaceSystem, "addons-nginx-ingress-controller")
if err != nil {
b.Logger.Info("Waiting until the addons-nginx-ingress-controller service deployed in the Shoot cluster is ready...")
// TODO(AC): This is a quite optimistic check / we should differentiate here
return retry.MinorError(fmt.Errorf("addons-nginx-ingress-controller service deployed in the Shoot cluster is not ready: %v", err))
}
b.SetNginxIngressAddress(loadBalancerIngress, b.K8sSeedClient.DirectClient())
return retry.Ok()
})
}
// WaitUntilEtcdReady waits until the etcd statefulsets indicate readiness in their statuses.
func (b *Botanist) WaitUntilEtcdReady(ctx context.Context) error {
var (
retryCountUntilSevere int
interval = 5 * time.Second
severeThreshold = 30 * time.Second
timeout = 5 * time.Minute
)
return retry.UntilTimeout(ctx, interval, timeout, func(ctx context.Context) (done bool, err error) {
retryCountUntilSevere++
etcdList := &druidv1alpha1.EtcdList{}
if err := b.K8sSeedClient.DirectClient().List(ctx, etcdList,
client.InNamespace(b.Shoot.SeedNamespace),
client.MatchingLabels{"garden.sapcloud.io/role": "controlplane"},
); err != nil {
return retry.SevereError(err)
}
if n := len(etcdList.Items); n < 2 {
b.Logger.Info("Waiting until the etcd gets created...")
return retry.MinorError(fmt.Errorf("only %d/%d etcd resources found", n, 2))
}
var lastErrors error
for _, etcd := range etcdList.Items {
switch {
case etcd.Status.LastError != nil:
return retry.MinorOrSevereError(retryCountUntilSevere, int(severeThreshold.Nanoseconds()/interval.Nanoseconds()), fmt.Errorf("%s reconciliation errored: %s", etcd.Name, *etcd.Status.LastError))
case etcd.DeletionTimestamp != nil:
lastErrors = multierror.Append(lastErrors, fmt.Errorf("%s unexpectedly has a deletion timestamp", etcd.Name))
case etcd.Status.ObservedGeneration == nil || etcd.Generation != *etcd.Status.ObservedGeneration:
lastErrors = multierror.Append(lastErrors, fmt.Errorf("%s reconciliation pending", etcd.Name))
case metav1.HasAnnotation(etcd.ObjectMeta, v1beta1constants.GardenerOperation):
lastErrors = multierror.Append(lastErrors, fmt.Errorf("%s reconciliation in process", etcd.Name))
case !utils.IsTrue(etcd.Status.Ready):
lastErrors = multierror.Append(lastErrors, fmt.Errorf("%s is not ready yet", etcd.Name))
}
}
if lastErrors == nil {
return retry.Ok()
}
b.Logger.Info("Waiting until the both etcds are ready...")
return retry.MinorError(lastErrors)
})
}
// WaitUntilKubeAPIServerIsDeleted waits until the kube-apiserver is deleted
func (b *Botanist) WaitUntilKubeAPIServerIsDeleted(ctx context.Context) error {
return retry.UntilTimeout(ctx, 5*time.Second, 300*time.Second, func(ctx context.Context) (done bool, err error) {
deploy := &appsv1.Deployment{}
err = b.K8sSeedClient.Client().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deploy)
switch {
case apierrors.IsNotFound(err):
return retry.Ok()
case err == nil:
return retry.MinorError(err)
default:
return retry.SevereError(err)
}
})
}
// WaitUntilKubeAPIServerReady waits until the kube-apiserver pod(s) indicate readiness in their statuses.
func (b *Botanist) WaitUntilKubeAPIServerReady(ctx context.Context) error {
return retry.UntilTimeout(ctx, 5*time.Second, 300*time.Second, func(ctx context.Context) (done bool, err error) {
deploy := &appsv1.Deployment{}
if err := b.K8sSeedClient.DirectClient().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeAPIServer), deploy); err != nil {
return retry.SevereError(err)
}
if deploy.Generation != deploy.Status.ObservedGeneration {
return retry.MinorError(fmt.Errorf("kube-apiserver not observed at latest generation (%d/%d)",
deploy.Status.ObservedGeneration, deploy.Generation))
}
replicas := int32(0)
if deploy.Spec.Replicas != nil {
replicas = *deploy.Spec.Replicas
}
if replicas != deploy.Status.UpdatedReplicas {
return retry.MinorError(fmt.Errorf("kube-apiserver does not have enough updated replicas (%d/%d)",
deploy.Status.UpdatedReplicas, replicas))
}
if replicas != deploy.Status.Replicas {
return retry.MinorError(fmt.Errorf("kube-apiserver deployment has outdated replicas"))
}
if replicas != deploy.Status.AvailableReplicas {
return retry.MinorError(fmt.Errorf("kube-apiserver does not have enough available replicas (%d/%d",
deploy.Status.AvailableReplicas, replicas))
}
return retry.Ok()
})
}
// WaitUntilTunnelConnectionExists waits until a port forward connection to the tunnel pod (vpn-shoot or konnectivity-agent) in the kube-system
// namespace of the Shoot cluster can be established.
func (b *Botanist) WaitUntilTunnelConnectionExists(ctx context.Context) error {
return retry.UntilTimeout(ctx, 5*time.Second, 900*time.Second, func(ctx context.Context) (done bool, err error) {
tunnelName := common.VPNTunnel
if b.Shoot.KonnectivityTunnelEnabled {
tunnelName = common.KonnectivityTunnel
}
return b.CheckTunnelConnection(ctx, b.Logger, tunnelName)
})
}
// WaitUntilSeedNamespaceDeleted waits until the namespace of the Shoot cluster within the Seed cluster is deleted.
func (b *Botanist) WaitUntilSeedNamespaceDeleted(ctx context.Context) error {
return b.waitUntilNamespaceDeleted(ctx, b.Shoot.SeedNamespace)
}
// WaitUntilNamespaceDeleted waits until the <namespace> within the Seed cluster is deleted.
func (b *Botanist) waitUntilNamespaceDeleted(ctx context.Context, namespace string) error {
return retry.UntilTimeout(ctx, 5*time.Second, 900*time.Second, func(ctx context.Context) (done bool, err error) {
if err := b.K8sSeedClient.Client().Get(ctx, client.ObjectKey{Name: namespace}, &corev1.Namespace{}); err != nil {
if apierrors.IsNotFound(err) {
return retry.Ok()
}
return retry.SevereError(err)
}
b.Logger.Infof("Waiting until the namespace '%s' has been cleaned up and deleted in the Seed cluster...", namespace)
return retry.MinorError(fmt.Errorf("namespace %q is not yet cleaned up", namespace))
})
}
// WaitForControllersToBeActive checks whether kube-controller-manager has
// recently written to the Endpoint object holding the leader information. If yes, it is active.
func (b *Botanist) WaitForControllersToBeActive(ctx context.Context) error {
type controllerInfo struct {
name string
labels map[string]string
}
type checkOutput struct {
controllerName string
ready bool
err error
}
var (
controllers = []controllerInfo{}
pollInterval = 5 * time.Second
)
// Check whether the kube-controller-manager deployment exists
if err := b.K8sSeedClient.Client().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, v1beta1constants.DeploymentNameKubeControllerManager), &appsv1.Deployment{}); err == nil {
controllers = append(controllers, controllerInfo{
name: v1beta1constants.DeploymentNameKubeControllerManager,
labels: map[string]string{
"app": "kubernetes",
"role": "controller-manager",
},
})
} else if client.IgnoreNotFound(err) != nil {
return err
}
return retry.UntilTimeout(context.TODO(), pollInterval, 90*time.Second, func(ctx context.Context) (done bool, err error) {
var (
wg sync.WaitGroup
out = make(chan *checkOutput)
)
for _, controller := range controllers {
wg.Add(1)
go func(controller controllerInfo) {
defer wg.Done()
podList := &corev1.PodList{}
err := b.K8sSeedClient.Client().List(ctx, podList,
client.InNamespace(b.Shoot.SeedNamespace),
client.MatchingLabels(controller.labels))
if err != nil {
out <- &checkOutput{controllerName: controller.name, err: err}
return
}
// Check that only one replica of the controller exists.
if len(podList.Items) != 1 {
b.Logger.Infof("Waiting for %s to have exactly one replica", controller.name)
out <- &checkOutput{controllerName: controller.name}
return
}
// Check that the existing replica is not in getting deleted.
if podList.Items[0].DeletionTimestamp != nil {
b.Logger.Infof("Waiting for a new replica of %s", controller.name)
out <- &checkOutput{controllerName: controller.name}
return
}
// Check if the controller is active by reading its leader election record.
leaderElectionRecord, err := common.ReadLeaderElectionRecord(ctx, b.K8sShootClient, resourcelock.EndpointsResourceLock, metav1.NamespaceSystem, controller.name)
if err != nil {
out <- &checkOutput{controllerName: controller.name, err: err}
return
}
if delta := metav1.Now().UTC().Sub(leaderElectionRecord.RenewTime.Time.UTC()); delta <= pollInterval-time.Second {
out <- &checkOutput{controllerName: controller.name, ready: true}
return
}
b.Logger.Infof("Waiting for %s to be active", controller.name)
out <- &checkOutput{controllerName: controller.name}
}(controller)
}
go func() {
wg.Wait()
close(out)
}()
for result := range out {
if result.err != nil {
return retry.SevereError(fmt.Errorf("could not check whether controller %s is active: %+v", result.controllerName, result.err))
}
if !result.ready {
return retry.MinorError(fmt.Errorf("controller %s is not active", result.controllerName))
}
}
return retry.Ok()
})
}
// WaitUntilNodesDeleted waits until no nodes exist in the shoot cluster anymore.
func (b *Botanist) WaitUntilNodesDeleted(ctx context.Context) error {
return retry.Until(ctx, 5*time.Second, func(ctx context.Context) (done bool, err error) {
nodesList := &corev1.NodeList{}
if err := b.K8sShootClient.Client().List(ctx, nodesList); err != nil {
return retry.SevereError(err)
}
if len(nodesList.Items) == 0 {
return retry.Ok()
}
b.Logger.Infof("Waiting until all nodes have been deleted in the shoot cluster...")
return retry.MinorError(fmt.Errorf("not all nodes have been deleted in the shoot cluster"))
})
}
// WaitUntilNoPodRunning waits until there is no running Pod in the shoot cluster.
func (b *Botanist) WaitUntilNoPodRunning(ctx context.Context) error {
b.Logger.Info("waiting until there are no running Pods in the shoot cluster...")
return retry.Until(ctx, 5*time.Second, func(ctx context.Context) (done bool, err error) {
podList := &corev1.PodList{}
if err := b.K8sShootClient.Client().List(ctx, podList); err != nil {
return retry.SevereError(err)
}
for _, pod := range podList.Items {
if pod.Status.Phase == corev1.PodRunning {
msg := fmt.Sprintf("waiting until there are no running Pods in the shoot cluster... "+
"there is still at least one running Pod in the shoot cluster: %s/%s", pod.Namespace, pod.Name)
b.Logger.Info(msg)
return retry.MinorError(fmt.Errorf(msg))
}
}
return retry.Ok()
})
}
// WaitUntilEndpointsDoNotContainPodIPs waits until all endpoints in the shoot cluster to not contain any IPs from the Shoot's PodCIDR.
func (b *Botanist) WaitUntilEndpointsDoNotContainPodIPs(ctx context.Context) error {
b.Logger.Info("waiting until there are no Endpoints containing Pod IPs in the shoot cluster...")
var podsNetwork *net.IPNet
if val := b.Shoot.Info.Spec.Networking.Pods; val != nil {
var err error
_, podsNetwork, err = net.ParseCIDR(*val)
if err != nil {
return fmt.Errorf("unable to check if there are still Endpoints containing Pod IPs in the shoot cluster. Shoots's Pods network could not be parsed: %+v", err)
}
} else {
return fmt.Errorf("unable to check if there are still Endpoints containing Pod IPs in the shoot cluster. Shoot's Pods network is empty")
}
return retry.Until(ctx, 5*time.Second, func(ctx context.Context) (done bool, err error) {
endpointsList := &corev1.EndpointsList{}
if err := b.K8sShootClient.Client().List(ctx, endpointsList); err != nil {
return retry.SevereError(err)
}
serviceList := &corev1.ServiceList{}
if err := b.K8sShootClient.Client().List(ctx, serviceList); err != nil {
return retry.SevereError(err)
}
epsNotReconciledByKCM := sets.NewString()
for _, service := range serviceList.Items {
// if service.Spec.Selector is empty or nil, kube-controller-manager will not reconcile Endpoints for this Service
if len(service.Spec.Selector) == 0 {
epsNotReconciledByKCM.Insert(fmt.Sprintf("%s/%s", service.Namespace, service.Name))
}
}
for _, endpoints := range endpointsList.Items {
if epsNotReconciledByKCM.Has(fmt.Sprintf("%s/%s", endpoints.Namespace, endpoints.Name)) {
continue
}
for _, subset := range endpoints.Subsets {
for _, address := range subset.Addresses {
if podsNetwork.Contains(net.ParseIP(address.IP)) {
msg := fmt.Sprintf("waiting until there are no Endpoints containing Pod IPs in the shoot cluster... "+
"There is still at least one Endpoints object containing a Pod's IP: %s/%s, IP: %s", endpoints.Namespace, endpoints.Name, address.IP)
b.Logger.Info(msg)
return retry.MinorError(fmt.Errorf(msg))
}
}
}
}
return retry.Ok()
})
}
// WaitUntilBackupEntryInGardenReconciled waits until the backup entry within the garden cluster has
// been reconciled.
func (b *Botanist) WaitUntilBackupEntryInGardenReconciled(ctx context.Context) error {
return retry.UntilTimeout(ctx, 5*time.Second, 600*time.Second, func(ctx context.Context) (done bool, err error) {
be := &gardencorev1beta1.BackupEntry{}
if err := b.K8sGardenClient.DirectClient().Get(ctx, kutil.Key(b.Shoot.Info.Namespace, common.GenerateBackupEntryName(b.Shoot.SeedNamespace, b.Shoot.Info.Status.UID)), be); err != nil {
return retry.SevereError(err)
}
if be.Status.LastOperation != nil {
if be.Status.LastOperation.State == gardencorev1beta1.LastOperationStateSucceeded {
b.Logger.Info("Backup entry has been successfully reconciled.")
return retry.Ok()
}
if be.Status.LastOperation.State == gardencorev1beta1.LastOperationStateError {
b.Logger.Info("Backup entry has been reconciled with error.")
return retry.SevereError(errors.New(be.Status.LastError.Description))
}
}
b.Logger.Info("Waiting until the backup entry has been reconciled in the Garden cluster...")
return retry.MinorError(fmt.Errorf("backup entry %q has not yet been reconciled", be.Name))
})
}
// WaitUntilRequiredExtensionsReady waits until all the extensions required for a shoot reconciliation are ready
func (b *Botanist) WaitUntilRequiredExtensionsReady(ctx context.Context) error {
return retry.UntilTimeout(ctx, 5*time.Second, time.Minute, func(ctx context.Context) (done bool, err error) {
if err := b.RequiredExtensionsReady(ctx); err != nil {
b.Logger.Infof("Waiting until all the required extension controllers are ready (%+v)", err)
return retry.MinorError(err)
}
return retry.Ok()
})
}
// WaitUntilDeploymentScaledToDesiredReplicas waits for the number of available replicas to be equal to the deployment's desired replicas count.
func WaitUntilDeploymentScaledToDesiredReplicas(ctx context.Context, client client.Client, namespace, name string, desiredReplicas int32) error {
return retry.UntilTimeout(ctx, 5*time.Second, 300*time.Second, func(ctx context.Context) (done bool, err error) {
deployment := &appsv1.Deployment{}
if err := client.Get(ctx, kutil.Key(namespace, name), deployment); err != nil {
return retry.SevereError(err)
}
if deployment.Generation != deployment.Status.ObservedGeneration {
return retry.MinorError(fmt.Errorf("%q not observed at latest generation (%d/%d)", name,
deployment.Status.ObservedGeneration, deployment.Generation))
}
if deployment.Spec.Replicas == nil || *deployment.Spec.Replicas != desiredReplicas {
return retry.SevereError(fmt.Errorf("waiting for deployment %q to scale failed. spec.replicas does not match the desired replicas", name))
}
if deployment.Status.Replicas == desiredReplicas && deployment.Status.AvailableReplicas == desiredReplicas {
return retry.Ok()
}
return retry.MinorError(fmt.Errorf("deployment %q currently has '%d' replicas. Desired: %d", name, deployment.Status.AvailableReplicas, desiredReplicas))
})
}