mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 13:29:11 +01:00
114 lines
3.6 KiB
Go
114 lines
3.6 KiB
Go
/*
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Copyright 2017 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 node
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import (
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"time"
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"github.com/golang/glog"
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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/apimachinery/pkg/labels"
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"k8s.io/client-go/tools/cache"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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corelisters "k8s.io/kubernetes/pkg/client/listers/core/v1"
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)
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// ReadyNodes returns ready nodes irrespective of whether they are
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// schedulable or not.
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func ReadyNodes(client clientset.Interface, nodeSelector string, stopChannel <-chan struct{}) ([]*v1.Node, error) {
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ns, err := labels.Parse(nodeSelector)
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if err != nil {
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return []*v1.Node{}, err
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}
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var nodes []*v1.Node
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nl := GetNodeLister(client, stopChannel)
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if nl != nil {
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// err is defined above
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if nodes, err = nl.List(ns); err != nil {
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return []*v1.Node{}, err
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}
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}
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if len(nodes) == 0 {
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glog.V(2).Infof("node lister returned empty list, now fetch directly")
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nItems, err := client.Core().Nodes().List(metav1.ListOptions{LabelSelector: nodeSelector})
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if err != nil {
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return []*v1.Node{}, err
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}
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if nItems == nil || len(nItems.Items) == 0 {
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return []*v1.Node{}, nil
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}
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for i := range nItems.Items {
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node := nItems.Items[i]
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nodes = append(nodes, &node)
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}
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}
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readyNodes := make([]*v1.Node, 0, len(nodes))
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for _, node := range nodes {
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if IsReady(node) {
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readyNodes = append(readyNodes, node)
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}
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}
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return readyNodes, nil
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}
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func GetNodeLister(client clientset.Interface, stopChannel <-chan struct{}) corelisters.NodeLister {
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if stopChannel == nil {
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return nil
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}
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listWatcher := cache.NewListWatchFromClient(client.Core().RESTClient(), "nodes", v1.NamespaceAll, fields.Everything())
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store := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
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nodeLister := corelisters.NewNodeLister(store)
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reflector := cache.NewReflector(listWatcher, &v1.Node{}, store, time.Hour)
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reflector.RunUntil(stopChannel)
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return nodeLister
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}
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func IsReady(node *v1.Node) bool {
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for i := range node.Status.Conditions {
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cond := &node.Status.Conditions[i]
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// We consider the node for scheduling only when its:
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// - NodeReady condition status is ConditionTrue,
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// - NodeOutOfDisk condition status is ConditionFalse,
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// - NodeNetworkUnavailable condition status is ConditionFalse.
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if cond.Type == v1.NodeReady && cond.Status != v1.ConditionTrue {
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glog.V(1).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
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return false
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} /*else if cond.Type == v1.NodeOutOfDisk && cond.Status != v1.ConditionFalse {
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glog.V(4).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
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return false
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} else if cond.Type == v1.NodeNetworkUnavailable && cond.Status != v1.ConditionFalse {
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glog.V(4).Infof("Ignoring node %v with %v condition status %v", node.Name, cond.Type, cond.Status)
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return false
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}*/
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}
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// Ignore nodes that are marked unschedulable
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/*if node.Spec.Unschedulable {
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glog.V(4).Infof("Ignoring node %v since it is unschedulable", node.Name)
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return false
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}*/
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return true
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}
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