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waiter.go
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waiter.go
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// Copyright 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 kubecontrollermanager
import (
"context"
"fmt"
"time"
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/client-go/tools/leaderelection/resourcelock"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/kubernetes/health"
"github.com/gardener/gardener/pkg/utils/retry"
)
var (
// IntervalWaitForDeployment is the interval used while waiting for the Deployments to become healthy or deleted.
IntervalWaitForDeployment = 5 * time.Second
// TimeoutWaitForDeployment is the timeout used while waiting for the Deployments to become healthy or deleted.
TimeoutWaitForDeployment = 3 * time.Minute
// Until is an alias for retry.Until. Exposed for tests.
Until = retry.Until
)
func (k *kubeControllerManager) Wait(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForDeployment)
defer cancel()
return Until(timeoutCtx, IntervalWaitForDeployment, health.IsDeploymentUpdated(k.seedClient.APIReader(), k.emptyDeployment()))
}
func (k *kubeControllerManager) WaitCleanup(_ context.Context) error { return nil }
func (k *kubeControllerManager) WaitForControllerToBeActive(ctx context.Context) error {
const (
pollInterval = 5 * time.Second
pollTimeout = 90 * time.Second
)
// Check whether the kube-controller-manager deployment exists
if err := k.seedClient.Client().Get(ctx, kubernetesutils.Key(k.namespace, v1beta1constants.DeploymentNameKubeControllerManager), &appsv1.Deployment{}); err != nil {
if apierrors.IsNotFound(err) {
return fmt.Errorf("kube controller manager deployment not found: %w", err)
}
return err
}
return retry.UntilTimeout(ctx, pollInterval, pollTimeout, func(ctx context.Context) (done bool, err error) {
podList := &corev1.PodList{}
err = k.seedClient.Client().List(ctx, podList,
client.InNamespace(k.namespace),
client.MatchingLabels(map[string]string{
v1beta1constants.LabelApp: v1beta1constants.LabelKubernetes,
v1beta1constants.LabelRole: LabelRole,
}))
if err != nil {
return retry.SevereError(fmt.Errorf("could not check whether controller %s is active: %w", v1beta1constants.DeploymentNameKubeControllerManager, err))
}
// Check that one replica of the controller exists.
if len(podList.Items) < 1 {
k.log.Info("Waiting for kube-controller-manager to have at least one replica")
return retry.MinorError(fmt.Errorf("controller %s is not active", v1beta1constants.DeploymentNameKubeControllerManager))
}
// Check that the existing replicas are not getting deleted.
for _, pod := range podList.Items {
if pod.DeletionTimestamp != nil {
k.log.Info("Waiting for a new replica of kube-controller-manager")
return retry.MinorError(fmt.Errorf("controller %s is not active", v1beta1constants.DeploymentNameKubeControllerManager))
}
}
// Check if the controller is active by reading its leader election record.
lock := resourcelock.LeasesResourceLock
leaderElectionRecord, err := kubernetesutils.ReadLeaderElectionRecord(ctx, k.shootClient, lock, metav1.NamespaceSystem, v1beta1constants.DeploymentNameKubeControllerManager)
if err != nil {
return retry.SevereError(fmt.Errorf("could not check whether controller %s is active: %w", v1beta1constants.DeploymentNameKubeControllerManager, err))
}
lastRenew := metav1.Now().UTC().Sub(leaderElectionRecord.RenewTime.Time.UTC())
defaultRenewalTime := 2 * time.Second
if lastRenew <= defaultRenewalTime*2 {
return retry.Ok()
}
k.log.Info("Waiting for kube-controller-manager to be active")
return retry.MinorError(fmt.Errorf("controller %s is not active", v1beta1constants.DeploymentNameKubeControllerManager))
})
}