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vzinfo.go
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vzinfo.go
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/*
* Copyright 2018- The Pixie Authors.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package bridge
import (
"context"
"errors"
"fmt"
"sort"
"strings"
"sync"
"time"
"github.com/blang/semver"
"github.com/gogo/protobuf/types"
log "github.com/sirupsen/logrus"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/discovery"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"px.dev/pixie/src/api/proto/vizierpb"
"px.dev/pixie/src/operator/apis/px.dev/v1alpha1"
"px.dev/pixie/src/operator/client/versioned"
"px.dev/pixie/src/shared/cvmsgspb"
version "px.dev/pixie/src/shared/goversion"
protoutils "px.dev/pixie/src/shared/k8s"
"px.dev/pixie/src/shared/k8s/metadatapb"
"px.dev/pixie/src/utils/shared/k8s"
)
const k8sStateUpdatePeriod = 10 * time.Second
const privateImageRepo = "gcr.io/pixie-oss/pixie-dev"
const publicImageRepo = "gcr.io/pixie-oss/pixie-prod"
// K8sState describes the Kubernetes state of the Vizier instance.
type K8sState struct {
// Pod statuses for Vizier control plane pods.
ControlPlanePodStatuses map[string]*cvmsgspb.PodStatus
// Pod statuses for a sample (10) of unhealthy Vizier pods.
UnhealthyDataPlanePodStatuses map[string]*cvmsgspb.PodStatus
// The current K8s version of Vizier.
K8sClusterVersion string
// The number of nodes on the cluster.
NumNodes int32
// The number of nodes on the cluster that are running a PEM.
NumInstrumentedNodes int32
// The last time this information was updated.
LastUpdated time.Time
}
// K8sJobHandler manages k8s jobs.
type K8sJobHandler interface {
CleanupCronJob(string, time.Duration, chan bool)
}
// K8sVizierInfo is responsible for fetching Vizier information through K8s.
type K8sVizierInfo struct {
ns string
clientset *kubernetes.Clientset
vzClient *versioned.Clientset
clusterVersion string
clusterName string
controlPlanePodStatuses map[string]*cvmsgspb.PodStatus
unhealthyDataPlanePodStatuses map[string]*cvmsgspb.PodStatus
k8sStateLastUpdated time.Time
numNodes int32
numInstrumentedNodes int32
mu sync.Mutex
}
func getK8sVersion() (string, error) {
kubeConfig, err := rest.InClusterConfig()
if err != nil {
return "", err
}
discoveryClient, err := discovery.NewDiscoveryClientForConfig(kubeConfig)
if err != nil {
return "", err
}
version, err := discoveryClient.ServerVersion()
if err != nil {
return "", err
}
return version.GitVersion, nil
}
// NewK8sVizierInfo creates a new K8sVizierInfo.
func NewK8sVizierInfo(clusterName, ns string) (*K8sVizierInfo, error) {
// There is a specific config for services running in the cluster.
kubeConfig, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
// Create k8s client.
clientset, err := kubernetes.NewForConfig(kubeConfig)
if err != nil {
return nil, err
}
vzCrdClient, err := versioned.NewForConfig(kubeConfig)
if err != nil {
log.WithError(err).Error("Failed to initialize vizier CRD client")
return nil, err
}
vzInfo := &K8sVizierInfo{
ns: ns,
clientset: clientset,
vzClient: vzCrdClient,
clusterName: clusterName,
}
go func() {
t := time.NewTicker(k8sStateUpdatePeriod)
defer t.Stop()
for range t.C {
vzInfo.UpdateK8sState()
}
}()
return vzInfo, nil
}
// GetVizierClusterInfo gets the K8s cluster info for the current running vizier.
func (v *K8sVizierInfo) GetVizierClusterInfo() (*cvmsgspb.VizierClusterInfo, error) {
clusterUID, err := v.GetClusterUID()
if err != nil {
return nil, err
}
return &cvmsgspb.VizierClusterInfo{
ClusterUID: clusterUID,
ClusterName: v.clusterName,
VizierVersion: version.GetVersion().ToString(),
}, nil
}
// GetClusterUID gets UID for the cluster, represented by the kube-system namespace UID.
func (v *K8sVizierInfo) GetClusterUID() (string, error) {
ksNS, err := v.clientset.CoreV1().Namespaces().Get(context.Background(), "kube-system", metav1.GetOptions{})
if err != nil {
return "", err
}
return string(ksNS.UID), nil
}
const nanosPerSecond = int64(1000 * 1000 * 1000)
func nanosToTimestampProto(nanos int64) *types.Timestamp {
seconds := nanos / nanosPerSecond
remainderNanos := int32(nanos % nanosPerSecond)
return &types.Timestamp{
Seconds: seconds,
Nanos: remainderNanos,
}
}
// GetVizierPodLogs gets the k8s logs for the Vizier pod with the given name.
func (v *K8sVizierInfo) GetVizierPodLogs(podName string, previous bool, container string) (string, error) {
resp := v.clientset.CoreV1().Pods(v.ns).GetLogs(podName, &corev1.PodLogOptions{Previous: previous, Container: container}).Do(context.Background())
rawResp, err := resp.Raw()
if err != nil {
return "", err
}
return string(rawResp), nil
}
func convertPodPhase(p metadatapb.PodPhase) vizierpb.PodPhase {
switch p {
case metadatapb.PENDING:
return vizierpb.PENDING
case metadatapb.RUNNING:
return vizierpb.RUNNING
case metadatapb.SUCCEEDED:
return vizierpb.SUCCEEDED
case metadatapb.FAILED:
return vizierpb.FAILED
case metadatapb.PHASE_UNKNOWN:
return vizierpb.PHASE_UNKNOWN
default:
return vizierpb.PHASE_UNKNOWN
}
}
func convertContainerState(p metadatapb.ContainerState) vizierpb.ContainerState {
switch p {
case metadatapb.CONTAINER_STATE_RUNNING:
return vizierpb.CONTAINER_STATE_RUNNING
case metadatapb.CONTAINER_STATE_TERMINATED:
return vizierpb.CONTAINER_STATE_TERMINATED
case metadatapb.CONTAINER_STATE_WAITING:
return vizierpb.CONTAINER_STATE_WAITING
case metadatapb.CONTAINER_STATE_UNKNOWN:
return vizierpb.CONTAINER_STATE_UNKNOWN
default:
return vizierpb.CONTAINER_STATE_UNKNOWN
}
}
func (v *K8sVizierInfo) toVizierPodStatus(p *corev1.Pod) (*vizierpb.VizierPodStatus, error) {
podPb := protoutils.PodToProto(p)
podStatus := &vizierpb.VizierPodStatus{
Name: fmt.Sprintf("%s/%s", podPb.Metadata.Namespace, podPb.Metadata.Name),
CreatedAt: podPb.Metadata.CreationTimestampNS,
RestartCount: podPb.Status.RestartCount,
}
if podPb.Status != nil {
podStatus.Phase = convertPodPhase(podPb.Status.Phase)
podStatus.Message = podPb.Status.Message
podStatus.Reason = podPb.Status.Reason
for _, c := range podPb.Status.ContainerStatuses {
podStatus.ContainerStatuses = append(podStatus.ContainerStatuses, &vizierpb.ContainerStatus{
Name: c.Name,
Message: c.Message,
Reason: c.Reason,
ContainerState: convertContainerState(c.ContainerState),
StartTimestampNS: c.StartTimestampNS,
RestartCount: c.RestartCount,
})
}
}
return podStatus, nil
}
// GetVizierPods gets the Vizier pods and their statuses.
func (v *K8sVizierInfo) GetVizierPods() ([]*vizierpb.VizierPodStatus, []*vizierpb.VizierPodStatus, error) {
vls := k8s.VizierLabelSelector()
// Get only control-plane pods.
vls.MatchLabels["plane"] = "control"
rawControlPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(&vls),
})
if err != nil {
return nil, nil, err
}
vls = k8s.VizierLabelSelector()
// Get only data-plane pods.
vls.MatchLabels["plane"] = "data"
rawDataPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(&vls),
})
var controlPods []*vizierpb.VizierPodStatus
var dataPods []*vizierpb.VizierPodStatus
for _, rawPod := range rawControlPodsList.Items {
pod, err := v.toVizierPodStatus(&rawPod)
if err != nil {
return nil, nil, err
}
controlPods = append(controlPods, pod)
}
for _, rawPod := range rawDataPodsList.Items {
pod, err := v.toVizierPodStatus(&rawPod)
if err != nil {
return nil, nil, err
}
dataPods = append(dataPods, pod)
}
return controlPods, dataPods, err
}
// Convert a list of K8s pod information to our internal (cloud) representation of PodStatus.
func (v *K8sVizierInfo) getPodStatuses(podList []corev1.Pod) (map[string]*cvmsgspb.PodStatus, error) {
podMap := make(map[string]*cvmsgspb.PodStatus)
for _, p := range podList {
podPb := protoutils.PodToProto(&p)
status := metadatapb.PHASE_UNKNOWN
msg := ""
containers := make([]*cvmsgspb.ContainerStatus, 0)
if podPb.Status != nil {
status = podPb.Status.Phase
msg = podPb.Status.Reason
for _, c := range podPb.Status.ContainerStatuses {
containers = append(containers, &cvmsgspb.ContainerStatus{
Name: c.Name,
Message: c.Message,
Reason: c.Reason,
State: c.ContainerState,
CreatedAt: nanosToTimestampProto(c.StartTimestampNS),
RestartCount: c.RestartCount,
})
}
}
name := podPb.Metadata.Name
ns := v.ns
events := make([]*cvmsgspb.K8SEvent, 0)
eventsInterface := v.clientset.CoreV1().Events(v.ns)
selector := eventsInterface.GetFieldSelector(&name, &ns, nil, nil)
options := metav1.ListOptions{FieldSelector: selector.String()}
evs, err := eventsInterface.List(context.Background(), options)
if err == nil {
// Limit to last 5 events.
start := len(evs.Items) - 5
if start < 0 {
start = 0
}
end := len(evs.Items)
for start < end {
e := evs.Items[start]
events = append(events, &cvmsgspb.K8SEvent{
Message: e.Message,
FirstTime: nanosToTimestampProto(e.FirstTimestamp.UnixNano()),
LastTime: nanosToTimestampProto(e.LastTimestamp.UnixNano()),
})
start++
}
} else {
return nil, err
}
s := &cvmsgspb.PodStatus{
Name: name,
Status: status,
StatusMessage: msg,
Containers: containers,
CreatedAt: nanosToTimestampProto(podPb.Metadata.CreationTimestampNS),
Events: events,
RestartCount: podPb.Status.RestartCount,
}
podMap[name] = s
}
return podMap, nil
}
func (v *K8sVizierInfo) getControlPlanePodStatuses() (map[string]*cvmsgspb.PodStatus, error) {
// Get only control-plane pods.
cpPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: "plane=control",
})
if err != nil {
return nil, err
}
return v.getPodStatuses(cpPodsList.Items)
}
// Capture K8s state related to the data plane (num nodes, num instrumented nodes, unhealthy data plane pods)
func (v *K8sVizierInfo) getDataPlaneState() (int32, int32, map[string]*cvmsgspb.PodStatus, error) {
nodesList, err := v.clientset.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
if err != nil {
log.WithError(err).Error("Error fetching nodes")
return 0, 0, nil, err
}
var unhealthyDataPlanePods []corev1.Pod
kelvinPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: "name=kelvin",
})
if err != nil {
log.WithError(err).Error("Error fetching Kelvin pods")
return 0, 0, nil, err
}
for _, kelvinPod := range kelvinPodsList.Items {
if kelvinPod.Status.Phase != corev1.PodRunning {
unhealthyDataPlanePods = append(unhealthyDataPlanePods, kelvinPod)
}
}
var unhealthyPEMPods []corev1.Pod
pemPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: "name=vizier-pem",
})
if err != nil {
log.WithError(err).Error("Error fetching PEM pods")
return 0, 0, nil, err
}
// Get the count of healthy PEMs.
healthyPemCount := 0
for _, pemPod := range pemPodsList.Items {
if pemPod.Status.Phase == corev1.PodRunning {
healthyPemCount++
} else {
unhealthyPEMPods = append(unhealthyPEMPods, pemPod)
}
}
// Sort the unhealthy PEM pods. Get the first N.
maxUnhealthyDataPlanePods := 10
sort.Slice(unhealthyPEMPods, func(i, j int) bool {
return unhealthyPEMPods[i].ObjectMeta.Name < unhealthyPEMPods[j].ObjectMeta.Name
})
for i := 0; i < len(unhealthyPEMPods); i++ {
if len(unhealthyDataPlanePods) <= maxUnhealthyDataPlanePods {
break
}
unhealthyDataPlanePods = append(unhealthyDataPlanePods, unhealthyPEMPods[i])
}
unhealthyDataPlanePodStatuses, err := v.getPodStatuses(unhealthyDataPlanePods)
if err != nil {
return 0, 0, nil, err
}
return int32(len(nodesList.Items)), int32(healthyPemCount), unhealthyDataPlanePodStatuses, nil
}
// UpdateK8sState gets the relevant state of the cluster, such as pod statuses, at the current moment in time.
func (v *K8sVizierInfo) UpdateK8sState() {
controlPlanePods, err := v.getControlPlanePodStatuses()
if err != nil {
log.WithError(err).Error("Error fetching control plane pod statuses")
return
}
numNodes, numInstrumentedNodes, unhealthyDataPlanePods, err := v.getDataPlaneState()
if err != nil {
log.WithError(err).Error("Error fetching data plane pod information")
return
}
clusterVersion, err := getK8sVersion()
if err != nil {
log.WithError(err).Error("Failed to get Kubernetes version for cluster")
return
}
now := time.Now()
v.mu.Lock()
defer v.mu.Unlock()
v.k8sStateLastUpdated = now
v.controlPlanePodStatuses = controlPlanePods
v.unhealthyDataPlanePodStatuses = unhealthyDataPlanePods
v.numNodes = numNodes
v.numInstrumentedNodes = numInstrumentedNodes
v.clusterVersion = clusterVersion
}
// Function to copy pod statuses since maps are a reference type and we return
// a map to the downstream consumers of K8sState.
func copyPodStatus(podStatuses map[string]*cvmsgspb.PodStatus) map[string]*cvmsgspb.PodStatus {
if podStatuses == nil {
return nil
}
clone := make(map[string]*cvmsgspb.PodStatus)
for k, v := range podStatuses {
clone[k] = v
}
return clone
}
// GetK8sState gets the pod statuses and the last time they were updated.
func (v *K8sVizierInfo) GetK8sState() *K8sState {
v.mu.Lock()
defer v.mu.Unlock()
return &K8sState{
ControlPlanePodStatuses: copyPodStatus(v.controlPlanePodStatuses),
UnhealthyDataPlanePodStatuses: copyPodStatus(v.unhealthyDataPlanePodStatuses),
NumNodes: v.numNodes,
NumInstrumentedNodes: v.numInstrumentedNodes,
LastUpdated: v.k8sStateLastUpdated,
K8sClusterVersion: v.clusterVersion,
}
}
// ParseJobYAML parses the yaml string into a k8s job and applies the image tag and env subtitutions.
func (v *K8sVizierInfo) ParseJobYAML(yamlStr string, imageTag map[string]string, envSubtitutions map[string]string) (*batchv1.Job, error) {
decode := scheme.Codecs.UniversalDeserializer().Decode
obj, _, err := decode([]byte(yamlStr), nil, nil)
if err != nil {
return nil, err
}
job, ok := obj.(*batchv1.Job)
if !ok {
return nil, errors.New("YAML could not be decoded to job")
}
// Add proper image tag and env substitutions.
for i, c := range job.Spec.Template.Spec.Containers {
if val, ok := imageTag[c.Name]; ok {
imgTag := strings.Split(job.Spec.Template.Spec.Containers[i].Image, ":")
imgPath := imgTag[0]
tagVers := semver.MustParse(val)
if len(tagVers.Pre) > 0 && strings.HasPrefix(imgPath, publicImageRepo) {
imgPath = strings.Replace(imgPath, publicImageRepo, privateImageRepo, 1)
}
job.Spec.Template.Spec.Containers[i].Image = imgPath + ":" + val
}
for j, e := range c.Env {
if val, ok := envSubtitutions[e.Name]; ok {
job.Spec.Template.Spec.Containers[i].Env[j].Value = val
}
}
}
return job, nil
}
// LaunchJob starts the specified job.
func (v *K8sVizierInfo) LaunchJob(j *batchv1.Job) (*batchv1.Job, error) {
job, err := v.clientset.BatchV1().Jobs(v.ns).Create(context.Background(), j, metav1.CreateOptions{})
if err != nil {
return nil, err
}
return job, nil
}
// CreateSecret creates the K8s secret.
func (v *K8sVizierInfo) CreateSecret(name string, literals map[string]string) error {
// Attempt to delete the secret first, if it already exists.
err := v.clientset.CoreV1().Secrets(v.ns).Delete(context.Background(), name, metav1.DeleteOptions{})
if err != nil {
log.WithError(err).Info("Failed to delete secret, possibly because it may not exist")
}
secret := &corev1.Secret{}
secret.SetGroupVersionKind(corev1.SchemeGroupVersion.WithKind("Secret"))
secret.Name = name
secret.Data = map[string][]byte{}
for k, v := range literals {
secret.Data[k] = []byte(v)
}
_, err = v.clientset.CoreV1().Secrets(v.ns).Create(context.Background(), secret, metav1.CreateOptions{})
if err != nil {
return err
}
return nil
}
// DeleteJob deletes the job with the specified name.
func (v *K8sVizierInfo) DeleteJob(name string) error {
policy := metav1.DeletePropagationBackground
return v.clientset.BatchV1().Jobs(v.ns).Delete(context.Background(), name, metav1.DeleteOptions{
PropagationPolicy: &policy,
})
}
// GetJob gets the job with the specified name.
func (v *K8sVizierInfo) GetJob(name string) (*batchv1.Job, error) {
return v.clientset.BatchV1().Jobs(v.ns).Get(context.Background(), name, metav1.GetOptions{})
}
// CleanupCronJob periodically cleans up any completed jobs that were run by the specified cronjob.
func (v *K8sVizierInfo) CleanupCronJob(cronJob string, duration time.Duration, quitCh chan bool) {
policy := metav1.DeletePropagationBackground
ticker := time.NewTicker(duration)
defer ticker.Stop()
for {
select {
case <-ticker.C:
jobs, err := v.clientset.BatchV1().Jobs(v.ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
log.WithError(err).Error("Could not list jobs")
continue
}
for _, j := range jobs.Items {
if len(j.ObjectMeta.OwnerReferences) > 0 && j.ObjectMeta.OwnerReferences[0].Name == cronJob && j.Status.Succeeded == 1 {
err = v.clientset.BatchV1().Jobs(v.ns).Delete(context.Background(), j.ObjectMeta.Name, metav1.DeleteOptions{
PropagationPolicy: &policy,
})
if err != nil {
log.WithError(err).Error("Could not delete job")
}
}
}
case <-quitCh:
return
}
}
}
// WaitForJobCompletion waits for the job with given name to complete.
func (v *K8sVizierInfo) WaitForJobCompletion(name string) (bool, error) {
watcher := cache.NewListWatchFromClient(v.clientset.BatchV1().RESTClient(), "jobs", v.ns, fields.OneTermEqualSelector("metadata.name", name))
w, err := watcher.Watch(metav1.ListOptions{})
if err != nil {
return false, err
}
for c := range w.ResultChan() {
o, ok := c.Object.(*batchv1.Job)
if ok {
if !o.Status.CompletionTime.IsZero() {
return true, nil // Job has completed.
}
if o.Status.Failed > 0 {
return false, nil
}
}
}
return true, nil
}
// UpdateClusterID updates the cluster ID in the cluster secrets.
func (v *K8sVizierInfo) UpdateClusterID(id string) error {
s, err := v.clientset.CoreV1().Secrets(v.ns).Get(context.Background(), "pl-cluster-secrets", metav1.GetOptions{})
if err != nil {
return err
}
s.Data["cluster-id"] = []byte(id)
_, err = v.clientset.CoreV1().Secrets(v.ns).Update(context.Background(), s, metav1.UpdateOptions{})
return err
}
// UpdateClusterName updates the cluster ID in the cluster secrets.
func (v *K8sVizierInfo) UpdateClusterName(id string) error {
s, err := v.clientset.CoreV1().Secrets(v.ns).Get(context.Background(), "pl-cluster-secrets", metav1.GetOptions{})
if err != nil {
return err
}
s.Data["cluster-name"] = []byte(id)
_, err = v.clientset.CoreV1().Secrets(v.ns).Update(context.Background(), s, metav1.UpdateOptions{})
return err
}
// UpdateClusterIDAnnotation updates the `cluster-id` annotation for the cloudconnector.
func (v *K8sVizierInfo) UpdateClusterIDAnnotation(id string) error {
ccPodsList, err := v.clientset.CoreV1().Pods(v.ns).List(context.Background(), metav1.ListOptions{
LabelSelector: "name=vizier-cloud-connector",
})
if err != nil {
return err
}
// No cloud-connector pods were found. This should never happen.
if len(ccPodsList.Items) == 0 {
return nil
}
ccPod := ccPodsList.Items[0]
if ccPod.Annotations == nil {
ccPod.Annotations = make(map[string]string)
}
ccPod.Annotations["cluster-id"] = id
if ccPod.Labels == nil {
ccPod.Labels = make(map[string]string)
}
ccPod.Labels["cluster-id"] = id
_, err = v.clientset.CoreV1().Pods(v.ns).Update(context.Background(), &ccPod, metav1.UpdateOptions{})
return err
}
// GetVizierCRD gets the Vizier CRD for the running Vizier, if running using an operator.
func (v *K8sVizierInfo) GetVizierCRD() (*v1alpha1.Vizier, error) {
viziers, err := v.vzClient.PxV1alpha1().Viziers(v.ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
return nil, err
}
if len(viziers.Items) > 0 {
return &viziers.Items[0], nil
}
return nil, errors.New("No vizier CRD found")
}
// UpdateCRDVizierVersion updates the version of the Vizier CRD in the namespace.
// Returns an error if the CRD was not found, or if an error occurred while
// updating the CRD. Returns whether or not an update was actually initiated.
// This is used to determine whether the vizier should actually be in "UPDATING"
// status, in the case of falsely initated update requests. This will be fixed
// as we move to having the operator fully manage vizier statuses.
func (v *K8sVizierInfo) UpdateCRDVizierVersion(version string) (bool, error) {
vz, err := v.GetVizierCRD()
if err != nil {
return false, err
}
if vz.Spec.Version == version {
return false, nil
}
vz.Spec.Version = version
_, err = v.vzClient.PxV1alpha1().Viziers(v.ns).Update(context.Background(), vz, metav1.UpdateOptions{})
if err != nil {
return false, err
}
return true, nil
}