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New podTemplate NodeInfoProcessor implementation
`nodeInfoWithPodTemplateProcessor` implements the `NodeInfoProcessor` interface. This NodeInfoProcessor can be used to assign Pods to a NodeInfo during scale-up simulation. The processor looks at PodTemplates to generates Pods from these templates. Only PodTemplates with a specific label are selected.
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151
...er-autoscaler/processors/nodeinfos/podtemplates/node_info_with_podtemplates_processors.go
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| /* | ||
| Copyright 2019 The Kubernetes 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. | ||
| */ | ||
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| package podtemplates | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
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| apiv1 "k8s.io/api/core/v1" | ||
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| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/fields" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
| utilerrors "k8s.io/apimachinery/pkg/util/errors" | ||
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| client "k8s.io/client-go/kubernetes" | ||
| v1lister "k8s.io/client-go/listers/core/v1" | ||
| "k8s.io/client-go/tools/cache" | ||
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| ca_context "k8s.io/autoscaler/cluster-autoscaler/context" | ||
| "k8s.io/autoscaler/cluster-autoscaler/processors/nodeinfos" | ||
| "k8s.io/autoscaler/cluster-autoscaler/simulator" | ||
| "k8s.io/autoscaler/cluster-autoscaler/utils/errors" | ||
| schedulerframework "k8s.io/kubernetes/pkg/scheduler/framework" | ||
| ) | ||
|
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| const ( | ||
| // PodTemplateDaemonSetLabelKey use as label key on PodTemplate corresponding to an extra Daemonset. | ||
| PodTemplateDaemonSetLabelKey = "cluster-autoscaler.kubernetes.io/daemonset-pod" | ||
| // PodTemplateDaemonSetLabelValueTrue use as PodTemplateDaemonSetLabelKey label value. | ||
| PodTemplateDaemonSetLabelValueTrue = "true" | ||
| ) | ||
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| // NewNodeInfoWithPodTemplateProcessor returns a default instance of NodeInfoProcessor. | ||
| func NewNodeInfoWithPodTemplateProcessor(kubeClient client.Interface) nodeinfos.NodeInfoProcessor { | ||
| internalContext, cancelFunc := context.WithCancel(context.Background()) | ||
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| return &nodeInfoWithPodTemplateProcessor{ | ||
| ctx: internalContext, | ||
| cancelFunc: cancelFunc, | ||
| podTemplateLister: newPodTemplateLister(kubeClient, internalContext.Done()), | ||
| } | ||
| } | ||
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| // nodeInfoWithPodTemplateProcessor add possible PodTemplates in nodeInfos. | ||
| type nodeInfoWithPodTemplateProcessor struct { | ||
| podTemplateLister v1lister.PodTemplateLister | ||
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| ctx context.Context | ||
| cancelFunc func() | ||
| } | ||
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| // Process returns unchanged nodeInfos. | ||
| func (p *nodeInfoWithPodTemplateProcessor) Process(ctx *ca_context.AutoscalingContext, nodeInfosForNodeGroups map[string]*schedulerframework.NodeInfo) (map[string]*schedulerframework.NodeInfo, error) { | ||
| // here we can use empty snapshot | ||
| clusterSnapshot := simulator.NewBasicClusterSnapshot() | ||
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| // retrieve only once the podTemplates list. | ||
| // This list will be used for each NodeGroup. | ||
| podTemplates, err := p.podTemplateLister.List(labels.Everything()) | ||
| if err != nil { | ||
| return nil, errors.ToAutoscalerError(errors.InternalError, err) | ||
| } | ||
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| result := make(map[string]*schedulerframework.NodeInfo, len(nodeInfosForNodeGroups)) | ||
| var errs []error | ||
| for id, nodeInfo := range nodeInfosForNodeGroups { | ||
| newNodeInfo, err := getNodeInfoWithPodTemplates(nodeInfo, podTemplates, clusterSnapshot, ctx.PredicateChecker) | ||
| if err != nil { | ||
| errs = append(errs, err) | ||
| } | ||
| result[id] = newNodeInfo | ||
| } | ||
|
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| return result, utilerrors.NewAggregate(errs) | ||
| } | ||
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| // CleanUp cleans up processor's internal structuxres. | ||
| func (p *nodeInfoWithPodTemplateProcessor) CleanUp() { | ||
| p.cancelFunc() | ||
| } | ||
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| func newPodTemplateLister(kubeClient client.Interface, stopchannel <-chan struct{}) v1lister.PodTemplateLister { | ||
| podTemplateWatchOption := func(options *metav1.ListOptions) { | ||
| options.FieldSelector = fields.Everything().String() | ||
| options.LabelSelector = labels.SelectorFromSet(getDaemonsetPodTemplateLabelSet()).String() | ||
| } | ||
| listWatcher := cache.NewFilteredListWatchFromClient(kubeClient.CoreV1().RESTClient(), "podtemplates", apiv1.NamespaceAll, podTemplateWatchOption) | ||
| store, reflector := cache.NewNamespaceKeyedIndexerAndReflector(listWatcher, &apiv1.PodTemplate{}, time.Hour) | ||
| lister := v1lister.NewPodTemplateLister(store) | ||
| go reflector.Run(stopchannel) | ||
| return lister | ||
| } | ||
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| func getNodeInfoWithPodTemplates(baseNodeInfo *schedulerframework.NodeInfo, podTemplates []*apiv1.PodTemplate, clusterSnapshot *simulator.BasicClusterSnapshot, predicateChecker simulator.PredicateChecker) (*schedulerframework.NodeInfo, error) { | ||
| node := baseNodeInfo.Node() | ||
| var pods []*apiv1.Pod | ||
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| for _, podInfo := range baseNodeInfo.Pods { | ||
| pods = append(pods, podInfo.Pod) | ||
| } | ||
| if err := clusterSnapshot.AddNodeWithPods(node, pods); err != nil { | ||
| return nil, err | ||
| } | ||
| // clone baseNodeInfo to not modify the input object. | ||
| newNodeInfo := baseNodeInfo.Clone() | ||
| for _, podTpl := range podTemplates { | ||
| newPod := newPod(podTpl, node.Name) | ||
| err := predicateChecker.CheckPredicates(clusterSnapshot, newPod, node.Name) | ||
| if err == nil { | ||
| newNodeInfo.AddPod(newPod) | ||
| } else if err.ErrorType() == simulator.NotSchedulablePredicateError { | ||
| // ok; we are just skipping this daemonset | ||
| } else { | ||
| // unexpected error | ||
| return nil, fmt.Errorf("unexpected error while calling PredicateChecker; %v", err) | ||
| } | ||
| } | ||
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| return newNodeInfo, nil | ||
| } | ||
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| func getDaemonsetPodTemplateLabelSet() labels.Set { | ||
| daemonsetPodTemplateLabels := map[string]string{ | ||
| PodTemplateDaemonSetLabelKey: PodTemplateDaemonSetLabelValueTrue, | ||
| } | ||
| return labels.Set(daemonsetPodTemplateLabels) | ||
| } | ||
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| func newPod(pt *apiv1.PodTemplate, nodeName string) *apiv1.Pod { | ||
| newPod := &apiv1.Pod{Spec: pt.Template.Spec, ObjectMeta: pt.Template.ObjectMeta} | ||
| newPod.Namespace = pt.Namespace | ||
| newPod.Name = fmt.Sprintf("%s-pod", pt.Name) | ||
| newPod.Spec.NodeName = nodeName | ||
| return newPod | ||
| } |
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