91 lines
3.5 KiB
Go
91 lines
3.5 KiB
Go
/*
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Copyright 2015 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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"fmt"
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"time"
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apiv1 "k8s.io/api/core/v1"
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policyv1 "k8s.io/api/policy/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/autoscaler/cluster-autoscaler/utils/drain"
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kube_util "k8s.io/autoscaler/cluster-autoscaler/utils/kubernetes"
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schedulerframework "k8s.io/kubernetes/pkg/scheduler/framework"
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)
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// NodeDeleteOptions contains various options to customize how draining will behave
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type NodeDeleteOptions struct {
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// SkipNodesWithSystemPods tells if nodes with pods from kube-system should be deleted (except for DaemonSet or mirror pods)
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SkipNodesWithSystemPods bool
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// SkipNodesWithLocalStorage tells if nodes with pods with local storage, e.g. EmptyDir or HostPath, should be deleted
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SkipNodesWithLocalStorage bool
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// MinReplicaCount controls the minimum number of replicas that a replica set or replication controller should have
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// to allow their pods deletion in scale down
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MinReplicaCount int
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}
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// GetPodsToMove returns a list of pods that should be moved elsewhere
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// and a list of DaemonSet pods that should be evicted if the node
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// is drained. Raises error if there is an unreplicated pod.
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// Based on kubectl drain code. If listers is nil it makes an assumption that RC, DS, Jobs and RS were deleted
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// along with their pods (no abandoned pods with dangling created-by annotation).
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// If listers is not nil it checks whether RC, DS, Jobs and RS that created these pods
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// still exist.
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func GetPodsToMove(nodeInfo *schedulerframework.NodeInfo, deleteOptions NodeDeleteOptions, listers kube_util.ListerRegistry,
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pdbs []*policyv1.PodDisruptionBudget, timestamp time.Time) (pods []*apiv1.Pod, daemonSetPods []*apiv1.Pod, blockingPod *drain.BlockingPod, err error) {
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for _, podInfo := range nodeInfo.Pods {
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pods = append(pods, podInfo.Pod)
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}
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pods, daemonSetPods, blockingPod, err = drain.GetPodsForDeletionOnNodeDrain(
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pods,
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pdbs,
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deleteOptions.SkipNodesWithSystemPods,
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deleteOptions.SkipNodesWithLocalStorage,
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listers,
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int32(deleteOptions.MinReplicaCount),
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timestamp)
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if err != nil {
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return pods, daemonSetPods, blockingPod, err
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}
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if pdbBlockingPod, err := checkPdbs(pods, pdbs); err != nil {
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return []*apiv1.Pod{}, []*apiv1.Pod{}, pdbBlockingPod, err
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}
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return pods, daemonSetPods, nil, nil
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}
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func checkPdbs(pods []*apiv1.Pod, pdbs []*policyv1.PodDisruptionBudget) (*drain.BlockingPod, error) {
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// TODO: remove it after deprecating legacy scale down.
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// PdbRemainingDisruption.CanDisrupt() to replace this function.
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for _, pdb := range pdbs {
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selector, err := metav1.LabelSelectorAsSelector(pdb.Spec.Selector)
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if err != nil {
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return nil, err
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}
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for _, pod := range pods {
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if pod.Namespace == pdb.Namespace && selector.Matches(labels.Set(pod.Labels)) {
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if pdb.Status.DisruptionsAllowed < 1 {
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return &drain.BlockingPod{Pod: pod, Reason: drain.NotEnoughPdb}, fmt.Errorf("not enough pod disruption budget to move %s/%s", pod.Namespace, pod.Name)
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}
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}
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}
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}
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return nil, nil
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}
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