-
Notifications
You must be signed in to change notification settings - Fork 39.4k
/
node.go
344 lines (303 loc) · 10.9 KB
/
node.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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
Copyright 2015 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.
*/
package node
import (
"encoding/json"
"fmt"
"net"
"os"
"strings"
"time"
"k8s.io/klog"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
)
const (
// NodeUnreachablePodReason is the reason on a pod when its state cannot be confirmed as kubelet is unresponsive
// on the node it is (was) running.
NodeUnreachablePodReason = "NodeLost"
// NodeUnreachablePodMessage is the message on a pod when its state cannot be confirmed as kubelet is unresponsive
// on the node it is (was) running.
NodeUnreachablePodMessage = "Node %v which was running pod %v is unresponsive"
)
// GetHostname returns OS's hostname if 'hostnameOverride' is empty; otherwise, return 'hostnameOverride'.
func GetHostname(hostnameOverride string) (string, error) {
hostName := hostnameOverride
if len(hostName) == 0 {
nodeName, err := os.Hostname()
if err != nil {
return "", fmt.Errorf("couldn't determine hostname: %v", err)
}
hostName = nodeName
}
// Trim whitespaces first to avoid getting an empty hostname
// For linux, the hostname is read from file /proc/sys/kernel/hostname directly
hostName = strings.TrimSpace(hostName)
if len(hostName) == 0 {
return "", fmt.Errorf("empty hostname is invalid")
}
return strings.ToLower(hostName), nil
}
// NoMatchError is a typed implementation of the error interface. It indicates a failure to get a matching Node.
type NoMatchError struct {
addresses []v1.NodeAddress
}
// Error is the implementation of the conventional interface for
// representing an error condition, with the nil value representing no error.
func (e *NoMatchError) Error() string {
return fmt.Sprintf("no preferred addresses found; known addresses: %v", e.addresses)
}
// GetPreferredNodeAddress returns the address of the provided node, using the provided preference order.
// If none of the preferred address types are found, an error is returned.
func GetPreferredNodeAddress(node *v1.Node, preferredAddressTypes []v1.NodeAddressType) (string, error) {
for _, addressType := range preferredAddressTypes {
for _, address := range node.Status.Addresses {
if address.Type == addressType {
return address.Address, nil
}
}
}
return "", &NoMatchError{addresses: node.Status.Addresses}
}
// GetNodeHostIP returns the provided node's IP, based on the priority:
// 1. NodeInternalIP
// 2. NodeExternalIP
func GetNodeHostIP(node *v1.Node) (net.IP, error) {
addresses := node.Status.Addresses
addressMap := make(map[v1.NodeAddressType][]v1.NodeAddress)
for i := range addresses {
addressMap[addresses[i].Type] = append(addressMap[addresses[i].Type], addresses[i])
}
if addresses, ok := addressMap[v1.NodeInternalIP]; ok {
return net.ParseIP(addresses[0].Address), nil
}
if addresses, ok := addressMap[v1.NodeExternalIP]; ok {
return net.ParseIP(addresses[0].Address), nil
}
return nil, fmt.Errorf("host IP unknown; known addresses: %v", addresses)
}
// GetNodeIP returns the ip of node with the provided hostname
// If required, wait for the node to be defined.
func GetNodeIP(client clientset.Interface, hostname string) net.IP {
var nodeIP net.IP
backoff := wait.Backoff{
Steps: 5,
Duration: 1 * time.Second,
Factor: 2.0,
Jitter: 0.2,
}
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
node, err := client.CoreV1().Nodes().Get(hostname, metav1.GetOptions{})
if err != nil {
klog.Errorf("Failed to retrieve node info: %v", err)
return false, nil
}
nodeIP, err = GetNodeHostIP(node)
if err != nil {
klog.Errorf("Failed to retrieve node IP: %v", err)
return false, err
}
return true, nil
})
if err == nil {
klog.Infof("Successfully retrieved node IP: %v", nodeIP)
}
return nodeIP
}
// GetZoneKey is a helper function that builds a string identifier that is unique per failure-zone;
// it returns empty-string for no zone.
func GetZoneKey(node *v1.Node) string {
labels := node.Labels
if labels == nil {
return ""
}
region, _ := labels[v1.LabelZoneRegion]
failureDomain, _ := labels[v1.LabelZoneFailureDomain]
if region == "" && failureDomain == "" {
return ""
}
// We include the null character just in case region or failureDomain has a colon
// (We do assume there's no null characters in a region or failureDomain)
// As a nice side-benefit, the null character is not printed by fmt.Print or glog
return region + ":\x00:" + failureDomain
}
type nodeForConditionPatch struct {
Status nodeStatusForPatch `json:"status"`
}
type nodeStatusForPatch struct {
Conditions []v1.NodeCondition `json:"conditions"`
}
// SetNodeCondition updates specific node condition with patch operation.
func SetNodeCondition(c clientset.Interface, node types.NodeName, condition v1.NodeCondition) error {
generatePatch := func(condition v1.NodeCondition) ([]byte, error) {
patch := nodeForConditionPatch{
Status: nodeStatusForPatch{
Conditions: []v1.NodeCondition{
condition,
},
},
}
patchBytes, err := json.Marshal(&patch)
if err != nil {
return nil, err
}
return patchBytes, nil
}
condition.LastHeartbeatTime = metav1.NewTime(time.Now())
patch, err := generatePatch(condition)
if err != nil {
return nil
}
_, err = c.CoreV1().Nodes().PatchStatus(string(node), patch)
return err
}
type nodeForCIDRMergePatch struct {
Spec nodeSpecForMergePatch `json:"spec"`
}
type nodeSpecForMergePatch struct {
PodCIDR string `json:"podCIDR"`
PodCIDRs []string `json:"podCIDRs,omitempty"`
}
// PatchNodeCIDR patches the specified node's CIDR to the given value.
func PatchNodeCIDR(c clientset.Interface, node types.NodeName, cidr string) error {
patch := nodeForCIDRMergePatch{
Spec: nodeSpecForMergePatch{
PodCIDR: cidr,
},
}
patchBytes, err := json.Marshal(&patch)
if err != nil {
return fmt.Errorf("failed to json.Marshal CIDR: %v", err)
}
if _, err := c.CoreV1().Nodes().Patch(string(node), types.StrategicMergePatchType, patchBytes); err != nil {
return fmt.Errorf("failed to patch node CIDR: %v", err)
}
return nil
}
// PatchNodeCIDRs patches the specified node.CIDR=cidrs[0] and node.CIDRs to the given value.
func PatchNodeCIDRs(c clientset.Interface, node types.NodeName, cidrs []string) error {
// set the pod cidrs list and set the old pod cidr field
patch := nodeForCIDRMergePatch{
Spec: nodeSpecForMergePatch{
PodCIDR: cidrs[0],
PodCIDRs: cidrs,
},
}
patchBytes, err := json.Marshal(&patch)
if err != nil {
return fmt.Errorf("failed to json.Marshal CIDR: %v", err)
}
klog.V(4).Infof("cidrs patch bytes are:%s", string(patchBytes))
if _, err := c.CoreV1().Nodes().Patch(string(node), types.StrategicMergePatchType, patchBytes); err != nil {
return fmt.Errorf("failed to patch node CIDR: %v", err)
}
return nil
}
// PatchNodeStatus patches node status.
func PatchNodeStatus(c v1core.CoreV1Interface, nodeName types.NodeName, oldNode *v1.Node, newNode *v1.Node) (*v1.Node, []byte, error) {
patchBytes, err := preparePatchBytesforNodeStatus(nodeName, oldNode, newNode)
if err != nil {
return nil, nil, err
}
updatedNode, err := c.Nodes().Patch(string(nodeName), types.StrategicMergePatchType, patchBytes, "status")
if err != nil {
return nil, nil, fmt.Errorf("failed to patch status %q for node %q: %v", patchBytes, nodeName, err)
}
return updatedNode, patchBytes, nil
}
func preparePatchBytesforNodeStatus(nodeName types.NodeName, oldNode *v1.Node, newNode *v1.Node) ([]byte, error) {
oldData, err := json.Marshal(oldNode)
if err != nil {
return nil, fmt.Errorf("failed to Marshal oldData for node %q: %v", nodeName, err)
}
// NodeStatus.Addresses is incorrectly annotated as patchStrategy=merge, which
// will cause strategicpatch.CreateTwoWayMergePatch to create an incorrect patch
// if it changed.
manuallyPatchAddresses := (len(oldNode.Status.Addresses) > 0) && !equality.Semantic.DeepEqual(oldNode.Status.Addresses, newNode.Status.Addresses)
// Reset spec to make sure only patch for Status or ObjectMeta is generated.
// Note that we don't reset ObjectMeta here, because:
// 1. This aligns with Nodes().UpdateStatus().
// 2. Some component does use this to update node annotations.
diffNode := newNode.DeepCopy()
diffNode.Spec = oldNode.Spec
if manuallyPatchAddresses {
diffNode.Status.Addresses = oldNode.Status.Addresses
}
newData, err := json.Marshal(diffNode)
if err != nil {
return nil, fmt.Errorf("failed to Marshal newData for node %q: %v", nodeName, err)
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Node{})
if err != nil {
return nil, fmt.Errorf("failed to CreateTwoWayMergePatch for node %q: %v", nodeName, err)
}
if manuallyPatchAddresses {
patchBytes, err = fixupPatchForNodeStatusAddresses(patchBytes, newNode.Status.Addresses)
if err != nil {
return nil, fmt.Errorf("failed to fix up NodeAddresses in patch for node %q: %v", nodeName, err)
}
}
return patchBytes, nil
}
// fixupPatchForNodeStatusAddresses adds a replace-strategy patch for Status.Addresses to
// the existing patch
func fixupPatchForNodeStatusAddresses(patchBytes []byte, addresses []v1.NodeAddress) ([]byte, error) {
// Given patchBytes='{"status": {"conditions": [ ... ], "phase": ...}}' and
// addresses=[{"type": "InternalIP", "address": "10.0.0.1"}], we need to generate:
//
// {
// "status": {
// "conditions": [ ... ],
// "phase": ...,
// "addresses": [
// {
// "type": "InternalIP",
// "address": "10.0.0.1"
// },
// {
// "$patch": "replace"
// }
// ]
// }
// }
var patchMap map[string]interface{}
if err := json.Unmarshal(patchBytes, &patchMap); err != nil {
return nil, err
}
addrBytes, err := json.Marshal(addresses)
if err != nil {
return nil, err
}
var addrArray []interface{}
if err := json.Unmarshal(addrBytes, &addrArray); err != nil {
return nil, err
}
addrArray = append(addrArray, map[string]interface{}{"$patch": "replace"})
status := patchMap["status"]
if status == nil {
status = map[string]interface{}{}
patchMap["status"] = status
}
statusMap, ok := status.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("unexpected data in patch")
}
statusMap["addresses"] = addrArray
return json.Marshal(patchMap)
}