forked from kubernetes-retired/contrib
-
Notifications
You must be signed in to change notification settings - Fork 0
/
cluster.go
184 lines (160 loc) · 6.02 KB
/
cluster.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
Copyright 2016 The Kubernetes Authors All rights reserved.
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 simulator
import (
"flag"
"fmt"
"math"
kube_api "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/resource"
kube_client "k8s.io/kubernetes/pkg/client/unversioned"
cmd "k8s.io/kubernetes/pkg/kubectl/cmd"
"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
"github.com/golang/glog"
)
var (
skipNodesWithSystemPods = flag.Bool("skip-nodes-with-system-pods", true,
"If true cluster autoscaler will never delete nodes with pods from kube-system (except for DeamonSet "+
"or mirror pods)")
skipNodesWithLocalStorage = flag.Bool("skip-nodes-with-local-storage", true,
"If true cluster autoscaler will never delete nodes with pods with local storage, e.g. EmptyDir or HostPath")
)
// FindNodesToRemove finds nodes that can be removed.
func FindNodesToRemove(candidates []*kube_api.Node, allNodes []*kube_api.Node, pods []*kube_api.Pod,
client *kube_client.Client, predicateChecker *PredicateChecker, maxCount int,
fastCheck bool) ([]*kube_api.Node, error) {
nodeNameToNodeInfo := schedulercache.CreateNodeNameToInfoMap(pods)
for _, node := range allNodes {
if nodeInfo, found := nodeNameToNodeInfo[node.Name]; found {
nodeInfo.SetNode(node)
}
}
result := make([]*kube_api.Node, 0)
evaluationType := "Detailed evaluation"
if fastCheck {
evaluationType = "Fast evaluation"
}
candidateloop:
for _, node := range candidates {
glog.V(2).Infof("%s: %s for removal", evaluationType, node.Name)
var podsToRemove []*kube_api.Pod
var err error
if fastCheck {
if nodeInfo, found := nodeNameToNodeInfo[node.Name]; found {
podsToRemove, err = FastGetPodsToMove(nodeInfo, false, *skipNodesWithSystemPods, *skipNodesWithLocalStorage, kube_api.Codecs.UniversalDecoder())
if err != nil {
glog.V(2).Infof("%s: node %s cannot be removed: %v", evaluationType, node.Name, err)
continue candidateloop
}
} else {
glog.V(2).Infof("%s: nodeInfo for %s not found", evaluationType, node.Name)
continue candidateloop
}
} else {
drainResult, _, _, err := cmd.GetPodsForDeletionOnNodeDrain(client, node.Name,
kube_api.Codecs.UniversalDecoder(), false, true)
if err != nil {
glog.V(2).Infof("%s: node %s cannot be removed: %v", evaluationType, node.Name, err)
continue candidateloop
}
podsToRemove = make([]*kube_api.Pod, 0, len(drainResult))
for i := range drainResult {
podsToRemove = append(podsToRemove, &drainResult[i])
}
}
findProblems := findPlaceFor(node.Name, podsToRemove, allNodes, nodeNameToNodeInfo, predicateChecker)
if findProblems == nil {
result = append(result, node)
glog.V(2).Infof("%s: node %s may be removed", evaluationType, node.Name)
if len(result) >= maxCount {
break candidateloop
}
} else {
glog.V(2).Infof("%s: node %s is not suitable for removal %v", evaluationType, node.Name, err)
}
}
return result, nil
}
// CalculateUtilization calculates utilization of a node, defined as total amount of requested resources divided by capacity.
func CalculateUtilization(node *kube_api.Node, nodeInfo *schedulercache.NodeInfo) (float64, error) {
cpu, err := calculateUtilizationOfResource(node, nodeInfo, kube_api.ResourceCPU)
if err != nil {
return 0, err
}
mem, err := calculateUtilizationOfResource(node, nodeInfo, kube_api.ResourceMemory)
if err != nil {
return 0, err
}
return math.Max(cpu, mem), nil
}
func calculateUtilizationOfResource(node *kube_api.Node, nodeInfo *schedulercache.NodeInfo, resourceName kube_api.ResourceName) (float64, error) {
nodeCapacity, found := node.Status.Capacity[resourceName]
if !found {
return 0, fmt.Errorf("Failed to get %v from %s", resourceName, node.Name)
}
if nodeCapacity.MilliValue() == 0 {
return 0, fmt.Errorf("%v is 0 at %s", resourceName, node.Name)
}
podsRequest := resource.MustParse("0")
for _, pod := range nodeInfo.Pods() {
for _, container := range pod.Spec.Containers {
if resourceValue, found := container.Resources.Requests[resourceName]; found {
podsRequest.Add(resourceValue)
}
}
}
return float64(podsRequest.MilliValue()) / float64(nodeCapacity.MilliValue()), nil
}
// TODO: We don't need to pass list of nodes here as they are already available in nodeInfos.
func findPlaceFor(bannedNode string, pods []*kube_api.Pod, nodes []*kube_api.Node, nodeInfos map[string]*schedulercache.NodeInfo,
predicateChecker *PredicateChecker) error {
newNodeInfos := make(map[string]*schedulercache.NodeInfo)
for _, podptr := range pods {
newpod := *podptr
newpod.Spec.NodeName = ""
pod := &newpod
foundPlace := false
glog.V(4).Infof("Looking for place for %s/%s", pod.Namespace, pod.Name)
podKey := fmt.Sprintf("%s/%s", pod.Namespace, pod.Name)
// TODO: Sort nodes by utilization
nodeloop:
for _, node := range nodes {
if node.Name == bannedNode {
continue
}
node.Status.Allocatable = node.Status.Capacity
nodeInfo, found := newNodeInfos[node.Name]
if !found {
nodeInfo, found = nodeInfos[node.Name]
}
if found {
err := predicateChecker.CheckPredicates(pod, nodeInfo)
glog.V(4).Infof("Evaluation %s for %s -> %v", node.Name, podKey, err)
if err == nil {
foundPlace = true
// TODO(mwielgus): Optimize it.
podsOnNode := nodeInfo.Pods()
podsOnNode = append(podsOnNode, pod)
newNodeInfo := schedulercache.NewNodeInfo(podsOnNode...)
newNodeInfo.SetNode(node)
newNodeInfos[node.Name] = newNodeInfo
break nodeloop
}
}
}
if !foundPlace {
return fmt.Errorf("failed to find place for %s", podKey)
}
}
return nil
}