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k8s_utils.go
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k8s_utils.go
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package framework
import (
"context"
"fmt"
"io"
"io/ioutil"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
gardenerutils "github.com/gardener/gardener/pkg/utils"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/kubernetes/health"
"github.com/gardener/gardener/pkg/utils/retry"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
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/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/rest"
k8sretry "k8s.io/client-go/util/retry"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// WaitUntilDaemonSetIsRunning waits until the daemon set with <daemonSetName> is running
func (f *CommonFramework) WaitUntilDaemonSetIsRunning(ctx context.Context, k8sClient client.Client, daemonSetName, daemonSetNamespace string) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (done bool, err error) {
daemonSet := &appsv1.DaemonSet{}
if err := k8sClient.Get(ctx, client.ObjectKey{Namespace: daemonSetNamespace, Name: daemonSetName}, daemonSet); err != nil {
return retry.MinorError(err)
}
if err := health.CheckDaemonSet(daemonSet); err != nil {
f.Logger.Infof("Waiting for %s to be ready!!", daemonSetName)
return retry.MinorError(fmt.Errorf("daemon set %s is not healthy: %v", daemonSetName, err))
}
f.Logger.Infof("%s is now ready!!", daemonSetName)
return retry.Ok()
})
}
// WaitUntilStatefulSetIsRunning waits until the stateful set with <statefulSetName> is running
func (f *CommonFramework) WaitUntilStatefulSetIsRunning(ctx context.Context, statefulSetName, statefulSetNamespace string, c kubernetes.Interface) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (done bool, err error) {
statefulSet := &appsv1.StatefulSet{}
if err := c.Client().Get(ctx, client.ObjectKey{Namespace: statefulSetNamespace, Name: statefulSetName}, statefulSet); err != nil {
return retry.MinorError(err)
}
if err := health.CheckStatefulSet(statefulSet); err != nil {
f.Logger.Infof("Waiting for %s to be ready!!", statefulSetName)
return retry.MinorError(fmt.Errorf("stateful set %s is not healthy: %v", statefulSetName, err))
}
f.Logger.Infof("%s is now ready!!", statefulSetName)
return retry.Ok()
})
}
// WaitUntilDeploymentIsReady waits until the given deployment is ready
func (f *CommonFramework) WaitUntilDeploymentIsReady(ctx context.Context, name string, namespace string, k8sClient kubernetes.Interface) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (done bool, err error) {
deployment := &appsv1.Deployment{}
if err := k8sClient.Client().Get(ctx, client.ObjectKey{Namespace: namespace, Name: name}, deployment); err != nil {
if apierrors.IsNotFound(err) {
f.Logger.Infof("Waiting for deployment %s/%s to be ready!", namespace, name)
return retry.MinorError(fmt.Errorf("deployment %q in namespace %q does not exist", name, namespace))
}
return retry.SevereError(err)
}
err = health.CheckDeployment(deployment)
if err != nil {
f.Logger.Infof("Waiting for deployment %s/%s to be ready!", namespace, name)
return retry.MinorError(fmt.Errorf("deployment %q in namespace %q is not healthy", name, namespace))
}
return retry.Ok()
})
}
// WaitUntilDeploymentsWithLabelsIsReady wait until pod with labels <podLabels> is running
func (f *CommonFramework) WaitUntilDeploymentsWithLabelsIsReady(ctx context.Context, deploymentLabels labels.Selector, namespace string, k8sClient kubernetes.Interface) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (done bool, err error) {
deployments := &appsv1.DeploymentList{}
if err := k8sClient.Client().List(ctx, deployments, client.MatchingLabelsSelector{Selector: deploymentLabels}, client.InNamespace(namespace)); err != nil {
if apierrors.IsNotFound(err) {
f.Logger.Infof("Waiting for deployments with labels: %v to be ready!!", deploymentLabels.String())
return retry.MinorError(fmt.Errorf("no deployments with labels %s exist", deploymentLabels.String()))
}
return retry.SevereError(err)
}
for _, deployment := range deployments.Items {
err = health.CheckDeployment(&deployment)
if err != nil {
f.Logger.Infof("Waiting for deployments with labels: %v to be ready!!", deploymentLabels)
return retry.MinorError(fmt.Errorf("deployment %s is not healthy: %v", deployment.Name, err))
}
}
return retry.Ok()
})
}
// WaitUntilNamespaceIsDeleted waits until a namespace has been deleted
func (f *CommonFramework) WaitUntilNamespaceIsDeleted(ctx context.Context, k8sClient kubernetes.Interface, ns string) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (bool, error) {
if err := k8sClient.Client().Get(ctx, client.ObjectKey{Name: ns}, &corev1.Namespace{}); err != nil {
if apierrors.IsNotFound(err) {
return retry.Ok()
}
return retry.MinorError(err)
}
return retry.MinorError(errors.Errorf("Namespace %s is not deleted yet", ns))
})
}
// WaitForNNodesToBeHealthy waits for exactly <n> Nodes to be healthy within a given timeout
func WaitForNNodesToBeHealthy(ctx context.Context, k8sClient kubernetes.Interface, n int, timeout time.Duration) error {
return WaitForNNodesToBeHealthyInWorkerPool(ctx, k8sClient, n, nil, timeout)
}
// WaitForNNodesToBeHealthyInWorkerPool waits for exactly <n> Nodes in a given worker pool to be healthy within a given timeout
func WaitForNNodesToBeHealthyInWorkerPool(ctx context.Context, k8sClient kubernetes.Interface, n int, workerGroup *string, timeout time.Duration) error {
return retry.UntilTimeout(ctx, defaultPollInterval, timeout, func(ctx context.Context) (done bool, err error) {
nodeList, err := GetAllNodesInWorkerPool(ctx, k8sClient, workerGroup)
if err != nil {
return retry.SevereError(err)
}
nodeCount := len(nodeList.Items)
if nodeCount != n {
return retry.MinorError(fmt.Errorf("waiting for exactly %d nodes to be ready: only %d nodes registered in the cluster", n, nodeCount))
}
for _, node := range nodeList.Items {
if err := health.CheckNode(&node); err != nil {
return retry.MinorError(fmt.Errorf("waiting for exactly %d nodes to be ready: node %q is not healthy: %v", n, node.Name, err))
}
}
return retry.Ok()
})
}
// GetAllNodes fetches all nodes
func GetAllNodes(ctx context.Context, c kubernetes.Interface) (*corev1.NodeList, error) {
return GetAllNodesInWorkerPool(ctx, c, nil)
}
// GetAllNodesInWorkerPool fetches all nodes of a specific worker group
func GetAllNodesInWorkerPool(ctx context.Context, c kubernetes.Interface, workerGroup *string) (*corev1.NodeList, error) {
nodeList := &corev1.NodeList{}
selectorOption := &client.MatchingLabelsSelector{}
if workerGroup != nil && len(*workerGroup) > 0 {
selectorOption.Selector = labels.SelectorFromSet(labels.Set{"worker.gardener.cloud/pool": *workerGroup})
}
err := c.Client().List(ctx, nodeList, selectorOption)
return nodeList, err
}
// GetPodsByLabels fetches all pods with the desired set of labels <labelsMap>
func GetPodsByLabels(ctx context.Context, labelsSelector labels.Selector, c kubernetes.Interface, namespace string) (*corev1.PodList, error) {
podList := &corev1.PodList{}
err := c.Client().List(ctx, podList,
client.InNamespace(namespace),
client.MatchingLabelsSelector{Selector: labelsSelector})
if err != nil {
return nil, err
}
return podList, nil
}
// GetFirstRunningPodWithLabels fetches the first running pod with the desired set of labels <labelsMap>
func GetFirstRunningPodWithLabels(ctx context.Context, labelsMap labels.Selector, namespace string, client kubernetes.Interface) (*corev1.Pod, error) {
var (
podList *corev1.PodList
err error
)
podList, err = GetPodsByLabels(ctx, labelsMap, client, namespace)
if err != nil {
return nil, err
}
if len(podList.Items) == 0 {
return nil, ErrNoRunningPodsFound
}
for _, pod := range podList.Items {
if health.IsPodReady(&pod) {
return &pod, nil
}
}
return nil, ErrNoRunningPodsFound
}
// PodExecByLabel executes a command inside pods filtered by label
func PodExecByLabel(ctx context.Context, podLabels labels.Selector, podContainer, command, namespace string, client kubernetes.Interface) (io.Reader, error) {
pod, err := GetFirstRunningPodWithLabels(ctx, podLabels, namespace, client)
if err != nil {
return nil, err
}
return NewPodExecutor(client).Execute(ctx, pod.Namespace, pod.Name, podContainer, command)
}
// DeleteResource deletes a kubernetes resource
func DeleteResource(ctx context.Context, k8sClient kubernetes.Interface, resource runtime.Object) error {
err := k8sClient.Client().Delete(ctx, resource)
if apierrors.IsNotFound(err) {
return nil
}
return err
}
// DeleteAndWaitForResource deletes a kubernetes resource and waits for its deletion
func DeleteAndWaitForResource(ctx context.Context, k8sClient kubernetes.Interface, resource runtime.Object, timeout time.Duration) error {
if err := DeleteResource(ctx, k8sClient, resource); err != nil {
return err
}
return retry.UntilTimeout(ctx, 5*time.Second, timeout, func(ctx context.Context) (done bool, err error) {
newResource := resource.DeepCopyObject()
key, err := client.ObjectKeyFromObject(resource)
if err != nil {
return retry.MinorError(err)
}
if err := k8sClient.Client().Get(ctx, key, newResource); err != nil {
if apierrors.IsNotFound(err) {
return retry.Ok()
}
return retry.MinorError(err)
}
return retry.MinorError(errors.New("Object still exists"))
})
}
// ScaleDeployment scales a deployment and waits until it is scaled
func ScaleDeployment(timeout time.Duration, client client.Client, desiredReplicas *int32, name, namespace string) (*int32, error) {
if desiredReplicas == nil {
return nil, nil
}
ctxSetup, cancelCtxSetup := context.WithTimeout(context.Background(), timeout)
defer cancelCtxSetup()
replicas, err := GetDeploymentReplicas(ctxSetup, client, namespace, name)
if apierrors.IsNotFound(err) {
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("failed to retrieve the replica count of the %s deployment: '%v'", name, err)
}
if replicas == nil || *replicas == *desiredReplicas {
return replicas, nil
}
// scale the deployment
if err := kubernetes.ScaleDeployment(ctxSetup, client, kutil.Key(namespace, name), *desiredReplicas); err != nil {
return nil, fmt.Errorf("failed to scale the replica count of the %s deployment: '%v'", name, err)
}
// wait until scaled
if err := WaitUntilDeploymentScaled(ctxSetup, client, namespace, name, *desiredReplicas); err != nil {
return nil, fmt.Errorf("failed to wait until the %s deployment is scaled: '%v'", name, err)
}
return replicas, nil
}
// WaitUntilDeploymentScaled waits until the deployment has the desired replica count in the status
func WaitUntilDeploymentScaled(ctx context.Context, client client.Client, namespace, name string, desiredReplicas int32) error {
return retry.Until(ctx, 5*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.Spec.Replicas == nil || *deployment.Spec.Replicas != desiredReplicas {
return retry.SevereError(fmt.Errorf("waiting for deployment scale failed. spec.replicas does not match the desired replicas"))
}
if deployment.Status.Replicas == desiredReplicas && deployment.Status.AvailableReplicas == desiredReplicas {
return retry.Ok()
}
return retry.MinorError(fmt.Errorf("deployment currently has '%d' replicas. Desired: %d", deployment.Status.AvailableReplicas, desiredReplicas))
})
}
// GetDeploymentReplicas gets the spec.Replicas count from a deployment
func GetDeploymentReplicas(ctx context.Context, client client.Client, namespace, name string) (*int32, error) {
deployment := &appsv1.Deployment{}
if err := client.Get(ctx, kutil.Key(namespace, name), deployment); err != nil {
return nil, err
}
replicas := deployment.Spec.Replicas
return replicas, nil
}
// ShootCreationCompleted checks if a shoot is successfully reconciled.
func ShootCreationCompleted(newShoot *gardencorev1beta1.Shoot) bool {
if newShoot.Generation != newShoot.Status.ObservedGeneration {
return false
}
if len(newShoot.Status.Conditions) == 0 && newShoot.Status.LastOperation == nil {
return false
}
for _, condition := range newShoot.Status.Conditions {
if condition.Status != gardencorev1beta1.ConditionTrue {
return false
}
}
if newShoot.Status.LastOperation != nil {
if newShoot.Status.LastOperation.Type == gardencorev1beta1.LastOperationTypeCreate ||
newShoot.Status.LastOperation.Type == gardencorev1beta1.LastOperationTypeReconcile {
if newShoot.Status.LastOperation.State != gardencorev1beta1.LastOperationStateSucceeded {
return false
}
}
}
return true
}
// DownloadKubeconfig downloads the shoot Kubeconfig
func DownloadKubeconfig(ctx context.Context, client kubernetes.Interface, namespace, name, downloadPath string) error {
kubeconfig, err := GetObjectFromSecret(ctx, client, namespace, name, KubeconfigSecretKeyName)
if err != nil {
return err
}
if downloadPath != "" {
err = ioutil.WriteFile(downloadPath, []byte(kubeconfig), 0755)
if err != nil {
return err
}
}
return nil
}
// UpdateSecret updates the Secret with an backoff
func UpdateSecret(ctx context.Context, k8sClient kubernetes.Interface, secret *corev1.Secret) error {
if err := k8sretry.RetryOnConflict(k8sretry.DefaultBackoff, func() (err error) {
existingSecret := &corev1.Secret{}
if err = k8sClient.Client().Get(ctx, client.ObjectKey{Namespace: secret.Namespace, Name: secret.Name}, existingSecret); err != nil {
return err
}
existingSecret.Data = secret.Data
return k8sClient.Client().Update(ctx, existingSecret)
}); err != nil {
return err
}
return nil
}
// GetObjectFromSecret returns object from secret
func GetObjectFromSecret(ctx context.Context, k8sClient kubernetes.Interface, namespace, secretName, objectKey string) (string, error) {
secret := &corev1.Secret{}
err := k8sClient.Client().Get(ctx, client.ObjectKey{Namespace: namespace, Name: secretName}, secret)
if err != nil {
return "", err
}
if _, ok := secret.Data[objectKey]; ok {
return string(secret.Data[objectKey]), nil
}
return "", fmt.Errorf("secret %s/%s did not contain object key %q", namespace, secretName, objectKey)
}
// NewClientFromServiceAccount returns a kubernetes client for a service account.
func NewClientFromServiceAccount(ctx context.Context, k8sClient kubernetes.Interface, account *corev1.ServiceAccount) (kubernetes.Interface, error) {
secret := &corev1.Secret{}
err := k8sClient.Client().Get(ctx, client.ObjectKey{Namespace: account.Namespace, Name: account.Secrets[0].Name}, secret)
if err != nil {
return nil, err
}
serviceAccountConfig := &rest.Config{
Host: k8sClient.RESTConfig().Host,
TLSClientConfig: rest.TLSClientConfig{
Insecure: false,
CAData: secret.Data["ca.crt"],
},
BearerToken: string(secret.Data["token"]),
}
return kubernetes.NewWithConfig(
kubernetes.WithRESTConfig(serviceAccountConfig),
kubernetes.WithClientOptions(
client.Options{
Scheme: kubernetes.GardenScheme,
}),
)
}
// WaitUntilPodIsRunning waits until the pod with <podName> is running
func WaitUntilPodIsRunning(ctx context.Context, log *logrus.Logger, podName, podNamespace string, c kubernetes.Interface) error {
return retry.Until(ctx, defaultPollInterval, func(ctx context.Context) (done bool, err error) {
pod := &corev1.Pod{}
if err := c.Client().Get(ctx, client.ObjectKey{Namespace: podNamespace, Name: podName}, pod); err != nil {
return retry.SevereError(err)
}
if !health.IsPodReady(pod) {
log.Infof("Waiting for %s to be ready!!", podName)
log.Infof("Waiting for %s to be ready!!", podName)
return retry.MinorError(fmt.Errorf(`pod "%s/%s" is not ready: %v`, podNamespace, podName, err))
}
return retry.Ok()
})
}
// DeployRootPod deploys a pod with root permissions for testing purposes.
func DeployRootPod(ctx context.Context, c client.Client, namespace string, nodename *string) (*corev1.Pod, error) {
podPriority := int32(0)
allowedCharacters := "0123456789abcdefghijklmnopqrstuvwxyz"
id, err := gardenerutils.GenerateRandomStringFromCharset(3, allowedCharacters)
if err != nil {
return nil, err
}
rootPod := corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: fmt.Sprintf("rootpod-%s", id),
Namespace: namespace,
Annotations: map[string]string{
"kubernetes.io/psp": "gardener.privileged",
},
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: "root-container",
Image: "busybox",
Command: []string{
"sleep",
"10000000",
},
Resources: corev1.ResourceRequirements{},
TerminationMessagePath: "/dev/termination-log",
TerminationMessagePolicy: corev1.TerminationMessageReadFile,
ImagePullPolicy: corev1.PullIfNotPresent,
SecurityContext: &corev1.SecurityContext{
Privileged: pointer.BoolPtr(true),
},
Stdin: true,
VolumeMounts: []corev1.VolumeMount{
{
Name: "root-volume",
MountPath: "/hostroot",
},
},
},
},
HostNetwork: true,
HostPID: true,
Priority: &podPriority,
Volumes: []corev1.Volume{
{
Name: "root-volume",
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: "/",
},
},
},
},
},
}
if nodename != nil {
rootPod.Spec.NodeName = *nodename
}
if err := c.Create(ctx, &rootPod); err != nil {
return nil, err
}
return &rootPod, nil
}