92 lines
3.0 KiB
Go
92 lines
3.0 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package simulator
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import (
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"time"
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apiv1 "k8s.io/api/core/v1"
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policyv1 "k8s.io/api/policy/v1beta1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/autoscaler/cluster-autoscaler/utils/drain"
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"k8s.io/autoscaler/cluster-autoscaler/utils/errors"
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kube_client "k8s.io/client-go/kubernetes"
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schedulercache "k8s.io/kubernetes/pkg/scheduler/cache"
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)
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// GetRequiredPodsForNode returns a list of pods that would appear on the node if the
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// node was just created (like daemonset and manifest-run pods). It reuses kubectl
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// drain command to get the list.
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func GetRequiredPodsForNode(nodename string, client kube_client.Interface) ([]*apiv1.Pod, errors.AutoscalerError) {
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// TODO: we should change this to use informer
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podListResult, err := client.CoreV1().Pods(apiv1.NamespaceAll).List(
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metav1.ListOptions{FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": nodename}).String()})
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if err != nil {
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return []*apiv1.Pod{}, errors.ToAutoscalerError(errors.ApiCallError, err)
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}
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allPods := make([]*apiv1.Pod, 0)
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for i := range podListResult.Items {
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allPods = append(allPods, &podListResult.Items[i])
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}
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podsToRemoveList, err := drain.GetPodsForDeletionOnNodeDrain(
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allPods,
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[]*policyv1.PodDisruptionBudget{}, // PDBs are irrelevant when considering new node.
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true, // Force all removals.
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false,
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false,
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false, // Setting this to true requires client to be not-null.
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nil,
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0,
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time.Now())
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if err != nil {
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return []*apiv1.Pod{}, errors.ToAutoscalerError(errors.InternalError, err)
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}
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podsToRemoveMap := make(map[string]struct{})
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for _, pod := range podsToRemoveList {
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podsToRemoveMap[pod.SelfLink] = struct{}{}
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}
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podsOnNewNode := make([]*apiv1.Pod, 0)
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for _, pod := range allPods {
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if pod.DeletionTimestamp != nil {
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continue
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}
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if _, found := podsToRemoveMap[pod.SelfLink]; !found {
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podsOnNewNode = append(podsOnNewNode, pod)
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}
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}
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return podsOnNewNode, nil
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}
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// BuildNodeInfoForNode build a NodeInfo structure for the given node as if the node was just created.
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func BuildNodeInfoForNode(node *apiv1.Node, client kube_client.Interface) (*schedulercache.NodeInfo, errors.AutoscalerError) {
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requiredPods, err := GetRequiredPodsForNode(node.Name, client)
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if err != nil {
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return nil, err
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}
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result := schedulercache.NewNodeInfo(requiredPods...)
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if err := result.SetNode(node); err != nil {
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return nil, errors.ToAutoscalerError(errors.InternalError, err)
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}
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return result, nil
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}
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