-
Notifications
You must be signed in to change notification settings - Fork 1
/
rest.go
581 lines (520 loc) · 21.1 KB
/
rest.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
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
/*
Copyright 2014 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 service
import (
"fmt"
"math/rand"
"net"
"net/http"
"net/url"
"strconv"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/api/rest"
apiservice "k8s.io/kubernetes/pkg/api/service"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/api/validation"
"k8s.io/kubernetes/pkg/registry/endpoint"
"k8s.io/kubernetes/pkg/registry/service/ipallocator"
"k8s.io/kubernetes/pkg/registry/service/portallocator"
"k8s.io/kubernetes/pkg/runtime"
featuregate "k8s.io/kubernetes/pkg/util/config"
utilnet "k8s.io/kubernetes/pkg/util/net"
utilruntime "k8s.io/kubernetes/pkg/util/runtime"
"k8s.io/kubernetes/pkg/util/validation/field"
"k8s.io/kubernetes/pkg/watch"
)
// ServiceRest includes storage for services and all sub resources
type ServiceRest struct {
Service *REST
Proxy *ProxyREST
}
// REST adapts a service registry into apiserver's RESTStorage model.
type REST struct {
registry Registry
endpoints endpoint.Registry
serviceIPs ipallocator.Interface
serviceNodePorts portallocator.Interface
proxyTransport http.RoundTripper
}
// NewStorage returns a new REST.
func NewStorage(registry Registry, endpoints endpoint.Registry, serviceIPs ipallocator.Interface,
serviceNodePorts portallocator.Interface, proxyTransport http.RoundTripper) *ServiceRest {
rest := &REST{
registry: registry,
endpoints: endpoints,
serviceIPs: serviceIPs,
serviceNodePorts: serviceNodePorts,
proxyTransport: proxyTransport,
}
return &ServiceRest{
Service: rest,
Proxy: &ProxyREST{ServiceRest: rest, ProxyTransport: proxyTransport},
}
}
func (rs *REST) Create(ctx api.Context, obj runtime.Object) (runtime.Object, error) {
service := obj.(*api.Service)
if err := rest.BeforeCreate(Strategy, ctx, obj); err != nil {
return nil, err
}
// TODO: this should probably move to strategy.PrepareForCreate()
releaseServiceIP := false
defer func() {
if releaseServiceIP {
if api.IsServiceIPSet(service) {
rs.serviceIPs.Release(net.ParseIP(service.Spec.ClusterIP))
}
}
}()
nodePortOp := portallocator.StartOperation(rs.serviceNodePorts)
defer nodePortOp.Finish()
if api.IsServiceIPRequested(service) {
// Allocate next available.
ip, err := rs.serviceIPs.AllocateNext()
if err != nil {
// TODO: what error should be returned here? It's not a
// field-level validation failure (the field is valid), and it's
// not really an internal error.
return nil, errors.NewInternalError(fmt.Errorf("failed to allocate a serviceIP: %v", err))
}
service.Spec.ClusterIP = ip.String()
releaseServiceIP = true
} else if api.IsServiceIPSet(service) {
// Try to respect the requested IP.
if err := rs.serviceIPs.Allocate(net.ParseIP(service.Spec.ClusterIP)); err != nil {
// TODO: when validation becomes versioned, this gets more complicated.
el := field.ErrorList{field.Invalid(field.NewPath("spec", "clusterIP"), service.Spec.ClusterIP, err.Error())}
return nil, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
releaseServiceIP = true
}
assignNodePorts := shouldAssignNodePorts(service)
svcPortToNodePort := map[int]int{}
for i := range service.Spec.Ports {
servicePort := &service.Spec.Ports[i]
allocatedNodePort := svcPortToNodePort[int(servicePort.Port)]
if allocatedNodePort == 0 {
// This will only scan forward in the service.Spec.Ports list because any matches
// before the current port would have been found in svcPortToNodePort. This is really
// looking for any user provided values.
np := findRequestedNodePort(int(servicePort.Port), service.Spec.Ports)
if np != 0 {
err := nodePortOp.Allocate(np)
if err != nil {
// TODO: when validation becomes versioned, this gets more complicated.
el := field.ErrorList{field.Invalid(field.NewPath("spec", "ports").Index(i).Child("nodePort"), np, err.Error())}
return nil, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
servicePort.NodePort = int32(np)
svcPortToNodePort[int(servicePort.Port)] = np
} else if assignNodePorts {
nodePort, err := nodePortOp.AllocateNext()
if err != nil {
// TODO: what error should be returned here? It's not a
// field-level validation failure (the field is valid), and it's
// not really an internal error.
return nil, errors.NewInternalError(fmt.Errorf("failed to allocate a nodePort: %v", err))
}
servicePort.NodePort = int32(nodePort)
svcPortToNodePort[int(servicePort.Port)] = nodePort
}
} else if int(servicePort.NodePort) != allocatedNodePort {
if servicePort.NodePort == 0 {
servicePort.NodePort = int32(allocatedNodePort)
} else {
err := nodePortOp.Allocate(int(servicePort.NodePort))
if err != nil {
// TODO: when validation becomes versioned, this gets more complicated.
el := field.ErrorList{field.Invalid(field.NewPath("spec", "ports").Index(i).Child("nodePort"), servicePort.NodePort, err.Error())}
return nil, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
}
}
}
if shouldCheckOrAssignHealthCheckNodePort(service) {
var healthCheckNodePort int
var err error
if l, ok := service.Annotations[apiservice.AnnotationHealthCheckNodePort]; ok {
healthCheckNodePort, err = strconv.Atoi(l)
if err != nil || healthCheckNodePort <= 0 {
return nil, errors.NewInternalError(fmt.Errorf("Failed to parse annotation %v: %v", apiservice.AnnotationHealthCheckNodePort, err))
}
}
if healthCheckNodePort > 0 {
// If the request has a health check nodePort in mind, attempt to reserve it
err := nodePortOp.Allocate(int(healthCheckNodePort))
if err != nil {
return nil, errors.NewInternalError(fmt.Errorf("Failed to allocate requested HealthCheck nodePort %v: %v", healthCheckNodePort, err))
}
} else {
// If the request has no health check nodePort specified, allocate any
healthCheckNodePort, err = nodePortOp.AllocateNext()
if err != nil {
// TODO: what error should be returned here? It's not a
// field-level validation failure (the field is valid), and it's
// not really an internal error.
return nil, errors.NewInternalError(fmt.Errorf("failed to allocate a nodePort: %v", err))
}
// Insert the newly allocated health check port as an annotation (plan of record for Alpha)
service.Annotations[apiservice.AnnotationHealthCheckNodePort] = fmt.Sprintf("%d", healthCheckNodePort)
}
}
out, err := rs.registry.CreateService(ctx, service)
if err != nil {
err = rest.CheckGeneratedNameError(Strategy, err, service)
}
if err == nil {
el := nodePortOp.Commit()
if el != nil {
// these should be caught by an eventual reconciliation / restart
glog.Errorf("error(s) committing service node-ports changes: %v", el)
}
releaseServiceIP = false
}
return out, err
}
func (rs *REST) Delete(ctx api.Context, id string) (runtime.Object, error) {
service, err := rs.registry.GetService(ctx, id)
if err != nil {
return nil, err
}
err = rs.registry.DeleteService(ctx, id)
if err != nil {
return nil, err
}
// TODO: can leave dangling endpoints, and potentially return incorrect
// endpoints if a new service is created with the same name
err = rs.endpoints.DeleteEndpoints(ctx, id)
if err != nil && !errors.IsNotFound(err) {
return nil, err
}
if api.IsServiceIPSet(service) {
rs.serviceIPs.Release(net.ParseIP(service.Spec.ClusterIP))
}
for _, nodePort := range CollectServiceNodePorts(service) {
err := rs.serviceNodePorts.Release(nodePort)
if err != nil {
// these should be caught by an eventual reconciliation / restart
glog.Errorf("Error releasing service %s node port %d: %v", service.Name, nodePort, err)
}
}
if shouldCheckOrAssignHealthCheckNodePort(service) {
nodePort := apiservice.GetServiceHealthCheckNodePort(service)
if nodePort > 0 {
err := rs.serviceNodePorts.Release(int(nodePort))
if err != nil {
// these should be caught by an eventual reconciliation / restart
utilruntime.HandleError(fmt.Errorf("Error releasing service health check %s node port %d: %v", service.Name, nodePort, err))
}
}
}
return &unversioned.Status{Status: unversioned.StatusSuccess}, nil
}
func (rs *REST) Get(ctx api.Context, id string) (runtime.Object, error) {
return rs.registry.GetService(ctx, id)
}
func (rs *REST) List(ctx api.Context, options *api.ListOptions) (runtime.Object, error) {
return rs.registry.ListServices(ctx, options)
}
// Watch returns Services events via a watch.Interface.
// It implements rest.Watcher.
func (rs *REST) Watch(ctx api.Context, options *api.ListOptions) (watch.Interface, error) {
return rs.registry.WatchServices(ctx, options)
}
// Export returns Service stripped of cluster-specific information.
// It implements rest.Exporter.
func (rs *REST) Export(ctx api.Context, name string, opts unversioned.ExportOptions) (runtime.Object, error) {
return rs.registry.ExportService(ctx, name, opts)
}
func (*REST) New() runtime.Object {
return &api.Service{}
}
func (*REST) NewList() runtime.Object {
return &api.ServiceList{}
}
func (rs *REST) healthCheckNodePortUpdate(oldService, service *api.Service) (bool, error) {
// Health Check Node Port handling during updates
//
// Case 1. Transition from globalTraffic to OnlyLocal for the ESIPP annotation
//
// Allocate a health check node port or attempt to reserve the user-specified one, if provided.
// Insert health check node port as an annotation into the service's annotations
//
// Case 2. Transition from OnlyLocal to Global for the ESIPP annotation
//
// Free the existing healthCheckNodePort and clear the health check nodePort annotation
//
// Case 3. No change (Global ---stays--> Global) but prevent invalid annotation manipulations
//
// Reject insertion of the "service.alpha.kubernetes.io/healthcheck-nodeport" annotation
//
// Case 4. No change (OnlyLocal ---stays--> OnlyLocal) but prevent invalid annotation manipulations
//
// Reject deletion of the "service.alpha.kubernetes.io/healthcheck-nodeport" annotation
// Reject changing the value of the healthCheckNodePort annotation
//
oldServiceHasHealthCheckNodePort := shouldCheckOrAssignHealthCheckNodePort(oldService)
oldHealthCheckNodePort := apiservice.GetServiceHealthCheckNodePort(oldService)
assignHealthCheckNodePort := shouldCheckOrAssignHealthCheckNodePort(service)
requestedHealthCheckNodePort := apiservice.GetServiceHealthCheckNodePort(service)
switch {
case !oldServiceHasHealthCheckNodePort && assignHealthCheckNodePort:
glog.Infof("Transition from Global LB service to OnlyLocal service")
if requestedHealthCheckNodePort > 0 {
// If the request has a health check nodePort in mind, attempt to reserve it
err := rs.serviceNodePorts.Allocate(int(requestedHealthCheckNodePort))
if err != nil {
errmsg := fmt.Sprintf("Failed to allocate requested HealthCheck nodePort %v:%v",
requestedHealthCheckNodePort, err)
el := field.ErrorList{field.Invalid(field.NewPath("metadata", "annotations"),
apiservice.AnnotationHealthCheckNodePort, errmsg)}
return false, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
glog.Infof("Reserved user requested nodePort: %d", requestedHealthCheckNodePort)
} else {
// If the request has no health check nodePort specified, allocate any
healthCheckNodePort, err := rs.serviceNodePorts.AllocateNext()
if err != nil {
// TODO: what error should be returned here? It's not a
// field-level validation failure (the field is valid), and it's
// not really an internal error.
return false, errors.NewInternalError(fmt.Errorf("failed to allocate a nodePort: %v", err))
}
// Insert the newly allocated health check port as an annotation (plan of record for Alpha)
service.Annotations[apiservice.AnnotationHealthCheckNodePort] = fmt.Sprintf("%d", healthCheckNodePort)
glog.Infof("Reserved health check nodePort: %d", healthCheckNodePort)
}
case oldServiceHasHealthCheckNodePort && !assignHealthCheckNodePort:
glog.Infof("Transition from OnlyLocal LB service to Global service")
err := rs.serviceNodePorts.Release(int(oldHealthCheckNodePort))
if err != nil {
glog.Warningf("Error releasing service health check %s node port %d: %v", service.Name, oldHealthCheckNodePort, err)
return false, errors.NewInternalError(fmt.Errorf("failed to free health check nodePort: %v", err))
} else {
delete(service.Annotations, apiservice.AnnotationHealthCheckNodePort)
glog.Infof("Freed health check nodePort: %d", oldHealthCheckNodePort)
}
case !oldServiceHasHealthCheckNodePort && !assignHealthCheckNodePort:
if _, ok := service.Annotations[apiservice.AnnotationHealthCheckNodePort]; ok {
glog.Warningf("Attempt to insert health check node port annotation DENIED")
el := field.ErrorList{field.Invalid(field.NewPath("metadata", "annotations"),
apiservice.AnnotationHealthCheckNodePort, "Cannot insert healthcheck nodePort annotation")}
return false, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
case oldServiceHasHealthCheckNodePort && assignHealthCheckNodePort:
if _, ok := service.Annotations[apiservice.AnnotationHealthCheckNodePort]; !ok {
glog.Warningf("Attempt to delete health check node port annotation DENIED")
el := field.ErrorList{field.Invalid(field.NewPath("metadata", "annotations"),
apiservice.AnnotationHealthCheckNodePort, "Cannot delete healthcheck nodePort annotation")}
return false, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
if oldHealthCheckNodePort != requestedHealthCheckNodePort {
glog.Warningf("Attempt to change value of health check node port annotation DENIED")
el := field.ErrorList{field.Invalid(field.NewPath("metadata", "annotations"),
apiservice.AnnotationHealthCheckNodePort, "Cannot change healthcheck nodePort during update")}
return false, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
}
return true, nil
}
func (rs *REST) Update(ctx api.Context, name string, objInfo rest.UpdatedObjectInfo) (runtime.Object, bool, error) {
oldService, err := rs.registry.GetService(ctx, name)
if err != nil {
return nil, false, err
}
obj, err := objInfo.UpdatedObject(ctx, oldService)
if err != nil {
return nil, false, err
}
service := obj.(*api.Service)
if !api.ValidNamespace(ctx, &service.ObjectMeta) {
return nil, false, errors.NewConflict(api.Resource("services"), service.Namespace, fmt.Errorf("Service.Namespace does not match the provided context"))
}
// Copy over non-user fields
// TODO: make this a merge function
if errs := validation.ValidateServiceUpdate(service, oldService); len(errs) > 0 {
return nil, false, errors.NewInvalid(api.Kind("Service"), service.Name, errs)
}
nodePortOp := portallocator.StartOperation(rs.serviceNodePorts)
defer nodePortOp.Finish()
assignNodePorts := shouldAssignNodePorts(service)
oldNodePorts := CollectServiceNodePorts(oldService)
newNodePorts := []int{}
if assignNodePorts {
for i := range service.Spec.Ports {
servicePort := &service.Spec.Ports[i]
nodePort := int(servicePort.NodePort)
if nodePort != 0 {
if !contains(oldNodePorts, nodePort) {
err := nodePortOp.Allocate(nodePort)
if err != nil {
el := field.ErrorList{field.Invalid(field.NewPath("spec", "ports").Index(i).Child("nodePort"), nodePort, err.Error())}
return nil, false, errors.NewInvalid(api.Kind("Service"), service.Name, el)
}
}
} else {
nodePort, err = nodePortOp.AllocateNext()
if err != nil {
// TODO: what error should be returned here? It's not a
// field-level validation failure (the field is valid), and it's
// not really an internal error.
return nil, false, errors.NewInternalError(fmt.Errorf("failed to allocate a nodePort: %v", err))
}
servicePort.NodePort = int32(nodePort)
}
// Detect duplicate node ports; this should have been caught by validation, so we panic
if contains(newNodePorts, nodePort) {
panic("duplicate node port")
}
newNodePorts = append(newNodePorts, nodePort)
}
} else {
// Validate should have validated that nodePort == 0
}
// The comparison loops are O(N^2), but we don't expect N to be huge
// (there's a hard-limit at 2^16, because they're ports; and even 4 ports would be a lot)
for _, oldNodePort := range oldNodePorts {
if !contains(newNodePorts, oldNodePort) {
continue
}
nodePortOp.ReleaseDeferred(oldNodePort)
}
// Remove any LoadBalancerStatus now if Type != LoadBalancer;
// although loadbalancer delete is actually asynchronous, we don't need to expose the user to that complexity.
if service.Spec.Type != api.ServiceTypeLoadBalancer {
service.Status.LoadBalancer = api.LoadBalancerStatus{}
}
success, err := rs.healthCheckNodePortUpdate(oldService, service)
if !success {
return nil, false, err
}
out, err := rs.registry.UpdateService(ctx, service)
if err == nil {
el := nodePortOp.Commit()
if el != nil {
// problems should be fixed by an eventual reconciliation / restart
glog.Errorf("error(s) committing NodePorts changes: %v", el)
}
}
return out, false, err
}
// Implement Redirector.
var _ = rest.Redirector(&REST{})
// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
// Allow ID as "svcname", "svcname:port", or "scheme:svcname:port".
svcScheme, svcName, portStr, valid := utilnet.SplitSchemeNamePort(id)
if !valid {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
}
// If a port *number* was specified, find the corresponding service port name
if portNum, err := strconv.ParseInt(portStr, 10, 64); err == nil {
svc, err := rs.registry.GetService(ctx, svcName)
if err != nil {
return nil, nil, err
}
found := false
for _, svcPort := range svc.Spec.Ports {
if int64(svcPort.Port) == portNum {
// use the declared port's name
portStr = svcPort.Name
found = true
break
}
}
if !found {
return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no service port %d found for service %q", portNum, svcName))
}
}
eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
if err != nil {
return nil, nil, err
}
if len(eps.Subsets) == 0 {
return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", svcName))
}
// Pick a random Subset to start searching from.
ssSeed := rand.Intn(len(eps.Subsets))
// Find a Subset that has the port.
for ssi := 0; ssi < len(eps.Subsets); ssi++ {
ss := &eps.Subsets[(ssSeed+ssi)%len(eps.Subsets)]
if len(ss.Addresses) == 0 {
continue
}
for i := range ss.Ports {
if ss.Ports[i].Name == portStr {
// Pick a random address.
ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
port := int(ss.Ports[i].Port)
return &url.URL{
Scheme: svcScheme,
Host: net.JoinHostPort(ip, strconv.Itoa(port)),
}, rs.proxyTransport, nil
}
}
}
return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", id))
}
// This is O(N), but we expect haystack to be small;
// so small that we expect a linear search to be faster
func contains(haystack []int, needle int) bool {
for _, v := range haystack {
if v == needle {
return true
}
}
return false
}
func CollectServiceNodePorts(service *api.Service) []int {
servicePorts := []int{}
for i := range service.Spec.Ports {
servicePort := &service.Spec.Ports[i]
if servicePort.NodePort != 0 {
servicePorts = append(servicePorts, int(servicePort.NodePort))
}
}
return servicePorts
}
func shouldAssignNodePorts(service *api.Service) bool {
switch service.Spec.Type {
case api.ServiceTypeLoadBalancer:
return true
case api.ServiceTypeNodePort:
return true
case api.ServiceTypeClusterIP:
return false
default:
glog.Errorf("Unknown service type: %v", service.Spec.Type)
return false
}
}
func shouldCheckOrAssignHealthCheckNodePort(service *api.Service) bool {
if service.Spec.Type == api.ServiceTypeLoadBalancer {
// True if Service-type == LoadBalancer AND annotation AnnotationExternalTraffic present
return (featuregate.DefaultFeatureGate.ExternalTrafficLocalOnly() && apiservice.NeedsHealthCheck(service))
}
glog.V(4).Infof("Service type: %v does not need health check node port", service.Spec.Type)
return false
}
// Loop through the service ports list, find one with the same port number and
// NodePort specified, return this NodePort otherwise return 0.
func findRequestedNodePort(port int, servicePorts []api.ServicePort) int {
for i := range servicePorts {
servicePort := servicePorts[i]
if port == int(servicePort.Port) && servicePort.NodePort != 0 {
return int(servicePort.NodePort)
}
}
return 0
}