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daemonset_controller.go
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daemonset_controller.go
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/*
Copyright 2020 The Flux 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.
*/
package canary
import (
"context"
"fmt"
"go.uber.org/zap"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/retry"
flaggerv1 "github.com/fluxcd/flagger/pkg/apis/flagger/v1beta1"
clientset "github.com/fluxcd/flagger/pkg/client/clientset/versioned"
)
var (
daemonSetScaleDownNodeSelector = map[string]string{"flagger.app/scale-to-zero": "true"}
)
// DaemonSetController is managing the operations for Kubernetes DaemonSet kind
type DaemonSetController struct {
kubeClient kubernetes.Interface
flaggerClient clientset.Interface
logger *zap.SugaredLogger
configTracker Tracker
labels []string
includeLabelPrefix []string
}
func (c *DaemonSetController) ScaleToZero(cd *flaggerv1.Canary) error {
targetName := cd.Spec.TargetRef.Name
dae, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("daemonset %s.%s get query error: %w", targetName, cd.Namespace, err)
}
daeCopy := dae.DeepCopy()
daeCopy.Spec.Template.Spec.NodeSelector = make(map[string]string,
len(dae.Spec.Template.Spec.NodeSelector)+len(daemonSetScaleDownNodeSelector))
for k, v := range dae.Spec.Template.Spec.NodeSelector {
daeCopy.Spec.Template.Spec.NodeSelector[k] = v
}
for k, v := range daemonSetScaleDownNodeSelector {
daeCopy.Spec.Template.Spec.NodeSelector[k] = v
}
_, err = c.kubeClient.AppsV1().DaemonSets(dae.Namespace).Update(context.TODO(), daeCopy, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("updating daemonset %s.%s failed: %w", daeCopy.GetName(), daeCopy.Namespace, err)
}
return nil
}
func (c *DaemonSetController) ScaleFromZero(cd *flaggerv1.Canary) error {
targetName := cd.Spec.TargetRef.Name
dep, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("daemonset %s.%s query error: %w", targetName, cd.Namespace, err)
}
depCopy := dep.DeepCopy()
for k := range daemonSetScaleDownNodeSelector {
delete(depCopy.Spec.Template.Spec.NodeSelector, k)
}
_, err = c.kubeClient.AppsV1().DaemonSets(dep.Namespace).Update(context.TODO(), depCopy, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("scaling up daemonset %s.%s failed: %w", depCopy.GetName(), depCopy.Namespace, err)
}
return nil
}
// Initialize creates the primary DaemonSet if it does not exist.
func (c *DaemonSetController) Initialize(cd *flaggerv1.Canary) (bool, error) {
err := c.createPrimaryDaemonSet(cd, c.includeLabelPrefix)
if err != nil {
return true, fmt.Errorf("createPrimaryDaemonSet failed: %w", err)
}
if cd.Status.Phase == "" || cd.Status.Phase == flaggerv1.CanaryPhaseInitializing {
if !cd.SkipAnalysis() {
if retriable, err := c.IsPrimaryReady(cd); err != nil {
return retriable, fmt.Errorf("%w", err)
}
}
}
return true, nil
}
// Promote copies the pod spec, secrets and config maps from canary to primary
func (c *DaemonSetController) Promote(cd *flaggerv1.Canary) error {
targetName := cd.Spec.TargetRef.Name
primaryName := fmt.Sprintf("%s-primary", targetName)
err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
canary, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("damonset %s.%s get query error: %v", targetName, cd.Namespace, err)
}
label, labelValue, err := c.getSelectorLabel(canary)
primaryLabelValue := fmt.Sprintf("%s-primary", labelValue)
if err != nil {
return fmt.Errorf("getSelectorLabel failed: %w", err)
}
primary, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), primaryName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("daemonset %s.%s get query error: %w", primaryName, cd.Namespace, err)
}
// promote secrets and config maps
configRefs, err := c.configTracker.GetTargetConfigs(cd)
if err != nil {
return fmt.Errorf("GetTargetConfigs failed: %w", err)
}
if err := c.configTracker.CreatePrimaryConfigs(cd, configRefs, c.includeLabelPrefix); err != nil {
return fmt.Errorf("CreatePrimaryConfigs failed: %w", err)
}
primaryCopy := primary.DeepCopy()
primaryCopy.Spec.MinReadySeconds = canary.Spec.MinReadySeconds
primaryCopy.Spec.RevisionHistoryLimit = canary.Spec.RevisionHistoryLimit
primaryCopy.Spec.UpdateStrategy = canary.Spec.UpdateStrategy
// update spec with primary secrets and config maps
primaryCopy.Spec.Template.Spec = c.configTracker.ApplyPrimaryConfigs(canary.Spec.Template.Spec, configRefs)
// ignore `daemonSetScaleDownNodeSelector` node selector
for key := range daemonSetScaleDownNodeSelector {
delete(primaryCopy.Spec.Template.Spec.NodeSelector, key)
}
// update pod annotations to ensure a rolling update
annotations, err := makeAnnotations(canary.Spec.Template.Annotations)
if err != nil {
return fmt.Errorf("makeAnnotations failed: %w", err)
}
primaryCopy.Spec.Template.Annotations = annotations
primaryCopy.Spec.Template.Labels = makePrimaryLabels(canary.Spec.Template.Labels, primaryLabelValue, label)
// update ds annotations
primaryCopy.ObjectMeta.Annotations = make(map[string]string)
filteredAnnotations := includeLabelsByPrefix(canary.ObjectMeta.Annotations, c.includeLabelPrefix)
for k, v := range filteredAnnotations {
primaryCopy.ObjectMeta.Annotations[k] = v
}
// update ds labels
filteredLabels := includeLabelsByPrefix(canary.ObjectMeta.Labels, c.includeLabelPrefix)
primaryCopy.ObjectMeta.Labels = makePrimaryLabels(filteredLabels, primaryLabelValue, label)
// apply update
_, err = c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Update(context.TODO(), primaryCopy, metav1.UpdateOptions{})
return err
})
if err != nil {
return fmt.Errorf("updating daemonset %s.%s template spec failed: %w",
primaryName, cd.Namespace, err)
}
return nil
}
// HasTargetChanged returns true if the canary DaemonSet pod spec has changed
func (c *DaemonSetController) HasTargetChanged(cd *flaggerv1.Canary) (bool, error) {
targetName := cd.Spec.TargetRef.Name
canary, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return false, fmt.Errorf("daemonset %s.%s get query error: %w", targetName, cd.Namespace, err)
}
// ignore `daemonSetScaleDownNodeSelector` node selector
for key := range daemonSetScaleDownNodeSelector {
delete(canary.Spec.Template.Spec.NodeSelector, key)
}
// since nil and capacity zero map would have different hash, we have to initialize here
if canary.Spec.Template.Spec.NodeSelector == nil {
canary.Spec.Template.Spec.NodeSelector = map[string]string{}
}
return hasSpecChanged(cd, canary.Spec.Template)
}
// GetMetadata returns the pod label selector and svc ports
func (c *DaemonSetController) GetMetadata(cd *flaggerv1.Canary) (string, string, map[string]int32, error) {
targetName := cd.Spec.TargetRef.Name
canaryDae, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return "", "", nil, fmt.Errorf("daemonset %s.%s get query error: %w", targetName, cd.Namespace, err)
}
label, labelValue, err := c.getSelectorLabel(canaryDae)
if err != nil {
return "", "", nil, fmt.Errorf("getSelectorLabel failed: %w", err)
}
var ports map[string]int32
if cd.Spec.Service.PortDiscovery {
ports = getPorts(cd, canaryDae.Spec.Template.Spec.Containers)
}
return label, labelValue, ports, nil
}
func (c *DaemonSetController) createPrimaryDaemonSet(cd *flaggerv1.Canary, includeLabelPrefix []string) error {
targetName := cd.Spec.TargetRef.Name
primaryName := fmt.Sprintf("%s-primary", cd.Spec.TargetRef.Name)
canaryDae, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), targetName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("daemonset %s.%s get query error: %w", targetName, cd.Namespace, err)
}
if canaryDae.Spec.UpdateStrategy.Type != "" &&
canaryDae.Spec.UpdateStrategy.Type != appsv1.RollingUpdateDaemonSetStrategyType {
return fmt.Errorf("daemonset %s.%s must have RollingUpdate strategy but have %s",
targetName, cd.Namespace, canaryDae.Spec.UpdateStrategy.Type)
}
// Create the labels map but filter unwanted labels
labels := includeLabelsByPrefix(canaryDae.Labels, includeLabelPrefix)
label, labelValue, err := c.getSelectorLabel(canaryDae)
primaryLabelValue := fmt.Sprintf("%s-primary", labelValue)
if err != nil {
return fmt.Errorf("getSelectorLabel failed: %w", err)
}
primaryDae, err := c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Get(context.TODO(), primaryName, metav1.GetOptions{})
if errors.IsNotFound(err) {
// create primary secrets and config maps
configRefs, err := c.configTracker.GetTargetConfigs(cd)
if err != nil {
return fmt.Errorf("GetTargetConfigs failed: %w", err)
}
if err := c.configTracker.CreatePrimaryConfigs(cd, configRefs, c.includeLabelPrefix); err != nil {
return fmt.Errorf("CreatePrimaryConfigs failed: %w", err)
}
annotations, err := makeAnnotations(canaryDae.Spec.Template.Annotations)
if err != nil {
return fmt.Errorf("makeAnnotations failed: %w", err)
}
// create primary daemonset
primaryDae = &appsv1.DaemonSet{
ObjectMeta: metav1.ObjectMeta{
Name: primaryName,
Namespace: cd.Namespace,
Labels: makePrimaryLabels(labels, primaryLabelValue, label),
Annotations: filterMetadata(canaryDae.Annotations),
OwnerReferences: []metav1.OwnerReference{
*metav1.NewControllerRef(cd, schema.GroupVersionKind{
Group: flaggerv1.SchemeGroupVersion.Group,
Version: flaggerv1.SchemeGroupVersion.Version,
Kind: flaggerv1.CanaryKind,
}),
},
},
Spec: appsv1.DaemonSetSpec{
MinReadySeconds: canaryDae.Spec.MinReadySeconds,
RevisionHistoryLimit: canaryDae.Spec.RevisionHistoryLimit,
UpdateStrategy: canaryDae.Spec.UpdateStrategy,
Selector: &metav1.LabelSelector{
MatchLabels: map[string]string{
label: primaryLabelValue,
},
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: makePrimaryLabels(canaryDae.Spec.Template.Labels, primaryLabelValue, label),
Annotations: annotations,
},
// update spec with the primary secrets and config maps
Spec: c.configTracker.ApplyPrimaryConfigs(canaryDae.Spec.Template.Spec, configRefs),
},
},
}
_, err = c.kubeClient.AppsV1().DaemonSets(cd.Namespace).Create(context.TODO(), primaryDae, metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("creating daemonset %s.%s failed: %w", primaryDae.Name, cd.Namespace, err)
}
c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).Infof("DaemonSet %s.%s created", primaryDae.GetName(), cd.Namespace)
}
return nil
}
// getSelectorLabel returns the selector match label
func (c *DaemonSetController) getSelectorLabel(daemonSet *appsv1.DaemonSet) (string, string, error) {
for _, l := range c.labels {
if _, ok := daemonSet.Spec.Selector.MatchLabels[l]; ok {
return l, daemonSet.Spec.Selector.MatchLabels[l], nil
}
}
return "", "", fmt.Errorf(
"daemonset %s.%s spec.selector.matchLabels must contain one of %v'",
daemonSet.Name, daemonSet.Namespace, c.labels,
)
}
func (c *DaemonSetController) HaveDependenciesChanged(cd *flaggerv1.Canary) (bool, error) {
return c.configTracker.HasConfigChanged(cd)
}
// Finalize scale the reference instance from zero
func (c *DaemonSetController) Finalize(cd *flaggerv1.Canary) error {
if err := c.ScaleFromZero(cd); err != nil {
return fmt.Errorf("ScaleFromZero failed: %w", err)
}
return nil
}