-
Notifications
You must be signed in to change notification settings - Fork 39.3k
/
controllermanager.go
897 lines (774 loc) · 37.6 KB
/
controllermanager.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
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
/*
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 app implements a server that runs a set of active
// components. This includes replication controllers, service endpoints and
// nodes.
package app
import (
"context"
"fmt"
"k8s.io/apimachinery/pkg/runtime/schema"
"math/rand"
"net/http"
"os"
"sort"
"time"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/server/healthz"
"k8s.io/apiserver/pkg/server/mux"
utilfeature "k8s.io/apiserver/pkg/util/feature"
cacheddiscovery "k8s.io/client-go/discovery/cached/memory"
"k8s.io/client-go/informers"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/metadata"
"k8s.io/client-go/metadata/metadatainformer"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
certutil "k8s.io/client-go/util/cert"
"k8s.io/client-go/util/keyutil"
cloudprovider "k8s.io/cloud-provider"
cliflag "k8s.io/component-base/cli/flag"
"k8s.io/component-base/cli/globalflag"
"k8s.io/component-base/configz"
"k8s.io/component-base/featuregate"
"k8s.io/component-base/logs"
logsapi "k8s.io/component-base/logs/api/v1"
metricsfeatures "k8s.io/component-base/metrics/features"
controllersmetrics "k8s.io/component-base/metrics/prometheus/controllers"
"k8s.io/component-base/metrics/prometheus/slis"
"k8s.io/component-base/term"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
genericcontrollermanager "k8s.io/controller-manager/app"
"k8s.io/controller-manager/controller"
"k8s.io/controller-manager/pkg/clientbuilder"
controllerhealthz "k8s.io/controller-manager/pkg/healthz"
"k8s.io/controller-manager/pkg/informerfactory"
"k8s.io/controller-manager/pkg/leadermigration"
"k8s.io/klog/v2"
"k8s.io/kubernetes/cmd/kube-controller-manager/app/config"
"k8s.io/kubernetes/cmd/kube-controller-manager/app/options"
"k8s.io/kubernetes/cmd/kube-controller-manager/names"
kubectrlmgrconfig "k8s.io/kubernetes/pkg/controller/apis/config"
garbagecollector "k8s.io/kubernetes/pkg/controller/garbagecollector"
serviceaccountcontroller "k8s.io/kubernetes/pkg/controller/serviceaccount"
"k8s.io/kubernetes/pkg/serviceaccount"
)
func init() {
utilruntime.Must(logsapi.AddFeatureGates(utilfeature.DefaultMutableFeatureGate))
utilruntime.Must(metricsfeatures.AddFeatureGates(utilfeature.DefaultMutableFeatureGate))
}
const (
// ControllerStartJitter is the Jitter used when starting controller managers
ControllerStartJitter = 1.0
// ConfigzName is the name used for register kube-controller manager /configz, same with GroupName.
ConfigzName = "kubecontrollermanager.config.k8s.io"
)
// ControllerLoopMode is the kube-controller-manager's mode of running controller loops that are cloud provider dependent
type ControllerLoopMode int
const (
// IncludeCloudLoops means the kube-controller-manager include the controller loops that are cloud provider dependent
IncludeCloudLoops ControllerLoopMode = iota
// ExternalLoops means the kube-controller-manager exclude the controller loops that are cloud provider dependent
ExternalLoops
)
// NewControllerManagerCommand creates a *cobra.Command object with default parameters
func NewControllerManagerCommand() *cobra.Command {
s, err := options.NewKubeControllerManagerOptions()
if err != nil {
klog.Background().Error(err, "Unable to initialize command options")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
}
cmd := &cobra.Command{
Use: "kube-controller-manager",
Long: `The Kubernetes controller manager is a daemon that embeds
the core control loops shipped with Kubernetes. In applications of robotics and
automation, a control loop is a non-terminating loop that regulates the state of
the system. In Kubernetes, a controller is a control loop that watches the shared
state of the cluster through the apiserver and makes changes attempting to move the
current state towards the desired state. Examples of controllers that ship with
Kubernetes today are the replication controller, endpoints controller, namespace
controller, and serviceaccounts controller.`,
PersistentPreRunE: func(*cobra.Command, []string) error {
// silence client-go warnings.
// kube-controller-manager generically watches APIs (including deprecated ones),
// and CI ensures it works properly against matching kube-apiserver versions.
restclient.SetDefaultWarningHandler(restclient.NoWarnings{})
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
// Activate logging as soon as possible, after that
// show flags with the final logging configuration.
if err := logsapi.ValidateAndApply(s.Logs, utilfeature.DefaultFeatureGate); err != nil {
return err
}
cliflag.PrintFlags(cmd.Flags())
c, err := s.Config(KnownControllers(), ControllersDisabledByDefault(), ControllerAliases())
if err != nil {
return err
}
// add feature enablement metrics
utilfeature.DefaultMutableFeatureGate.AddMetrics()
return Run(context.Background(), c.Complete())
},
Args: func(cmd *cobra.Command, args []string) error {
for _, arg := range args {
if len(arg) > 0 {
return fmt.Errorf("%q does not take any arguments, got %q", cmd.CommandPath(), args)
}
}
return nil
},
}
fs := cmd.Flags()
namedFlagSets := s.Flags(KnownControllers(), ControllersDisabledByDefault(), ControllerAliases())
verflag.AddFlags(namedFlagSets.FlagSet("global"))
globalflag.AddGlobalFlags(namedFlagSets.FlagSet("global"), cmd.Name(), logs.SkipLoggingConfigurationFlags())
registerLegacyGlobalFlags(namedFlagSets)
for _, f := range namedFlagSets.FlagSets {
fs.AddFlagSet(f)
}
cols, _, _ := term.TerminalSize(cmd.OutOrStdout())
cliflag.SetUsageAndHelpFunc(cmd, namedFlagSets, cols)
return cmd
}
// ResyncPeriod returns a function which generates a duration each time it is
// invoked; this is so that multiple controllers don't get into lock-step and all
// hammer the apiserver with list requests simultaneously.
func ResyncPeriod(c *config.CompletedConfig) func() time.Duration {
return func() time.Duration {
factor := rand.Float64() + 1
return time.Duration(float64(c.ComponentConfig.Generic.MinResyncPeriod.Nanoseconds()) * factor)
}
}
// Run runs the KubeControllerManagerOptions.
func Run(ctx context.Context, c *config.CompletedConfig) error {
logger := klog.FromContext(ctx)
stopCh := ctx.Done()
// To help debugging, immediately log version
logger.Info("Starting", "version", version.Get())
logger.Info("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))
// Start events processing pipeline.
c.EventBroadcaster.StartStructuredLogging(0)
c.EventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: c.Client.CoreV1().Events("")})
defer c.EventBroadcaster.Shutdown()
if cfgz, err := configz.New(ConfigzName); err == nil {
cfgz.Set(c.ComponentConfig)
} else {
logger.Error(err, "Unable to register configz")
}
// Setup any healthz checks we will want to use.
var checks []healthz.HealthChecker
var electionChecker *leaderelection.HealthzAdaptor
if c.ComponentConfig.Generic.LeaderElection.LeaderElect {
electionChecker = leaderelection.NewLeaderHealthzAdaptor(time.Second * 20)
checks = append(checks, electionChecker)
}
healthzHandler := controllerhealthz.NewMutableHealthzHandler(checks...)
// Start the controller manager HTTP server
// unsecuredMux is the handler for these controller *after* authn/authz filters have been applied
var unsecuredMux *mux.PathRecorderMux
if c.SecureServing != nil {
unsecuredMux = genericcontrollermanager.NewBaseHandler(&c.ComponentConfig.Generic.Debugging, healthzHandler)
slis.SLIMetricsWithReset{}.Install(unsecuredMux)
handler := genericcontrollermanager.BuildHandlerChain(unsecuredMux, &c.Authorization, &c.Authentication)
// TODO: handle stoppedCh and listenerStoppedCh returned by c.SecureServing.Serve
if _, _, err := c.SecureServing.Serve(handler, 0, stopCh); err != nil {
return err
}
}
clientBuilder, rootClientBuilder := createClientBuilders(logger, c)
saTokenControllerDescriptor := newServiceAccountTokenControllerDescriptor(rootClientBuilder)
run := func(ctx context.Context, controllerDescriptors map[string]*ControllerDescriptor) {
controllerContext, err := CreateControllerContext(ctx, c, rootClientBuilder, clientBuilder)
if err != nil {
logger.Error(err, "Error building controller context")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
}
if err := StartControllers(ctx, controllerContext, controllerDescriptors, unsecuredMux, healthzHandler); err != nil {
logger.Error(err, "Error starting controllers")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
}
controllerContext.InformerFactory.Start(stopCh)
controllerContext.ObjectOrMetadataInformerFactory.Start(stopCh)
close(controllerContext.InformersStarted)
<-ctx.Done()
}
// No leader election, run directly
if !c.ComponentConfig.Generic.LeaderElection.LeaderElect {
controllerDescriptors := NewControllerDescriptors()
controllerDescriptors[names.ServiceAccountTokenController] = saTokenControllerDescriptor
run(ctx, controllerDescriptors)
return nil
}
id, err := os.Hostname()
if err != nil {
return err
}
// add a uniquifier so that two processes on the same host don't accidentally both become active
id = id + "_" + string(uuid.NewUUID())
// leaderMigrator will be non-nil if and only if Leader Migration is enabled.
var leaderMigrator *leadermigration.LeaderMigrator = nil
// If leader migration is enabled, create the LeaderMigrator and prepare for migration
if leadermigration.Enabled(&c.ComponentConfig.Generic) {
logger.Info("starting leader migration")
leaderMigrator = leadermigration.NewLeaderMigrator(&c.ComponentConfig.Generic.LeaderMigration,
"kube-controller-manager")
// startSATokenControllerInit is the original InitFunc.
startSATokenControllerInit := saTokenControllerDescriptor.GetInitFunc()
// Wrap saTokenControllerDescriptor to signal readiness for migration after starting
// the controller.
saTokenControllerDescriptor.initFunc = func(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {
defer close(leaderMigrator.MigrationReady)
return startSATokenControllerInit(ctx, controllerContext, controllerName)
}
}
// Start the main lock
go leaderElectAndRun(ctx, c, id, electionChecker,
c.ComponentConfig.Generic.LeaderElection.ResourceLock,
c.ComponentConfig.Generic.LeaderElection.ResourceName,
leaderelection.LeaderCallbacks{
OnStartedLeading: func(ctx context.Context) {
controllerDescriptors := NewControllerDescriptors()
if leaderMigrator != nil {
// If leader migration is enabled, we should start only non-migrated controllers
// for the main lock.
controllerDescriptors = filteredControllerDescriptors(controllerDescriptors, leaderMigrator.FilterFunc, leadermigration.ControllerNonMigrated)
logger.Info("leader migration: starting main controllers.")
}
controllerDescriptors[names.ServiceAccountTokenController] = saTokenControllerDescriptor
run(ctx, controllerDescriptors)
},
OnStoppedLeading: func() {
logger.Error(nil, "leaderelection lost")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
},
})
// If Leader Migration is enabled, proceed to attempt the migration lock.
if leaderMigrator != nil {
// Wait for Service Account Token Controller to start before acquiring the migration lock.
// At this point, the main lock must have already been acquired, or the KCM process already exited.
// We wait for the main lock before acquiring the migration lock to prevent the situation
// where KCM instance A holds the main lock while KCM instance B holds the migration lock.
<-leaderMigrator.MigrationReady
// Start the migration lock.
go leaderElectAndRun(ctx, c, id, electionChecker,
c.ComponentConfig.Generic.LeaderMigration.ResourceLock,
c.ComponentConfig.Generic.LeaderMigration.LeaderName,
leaderelection.LeaderCallbacks{
OnStartedLeading: func(ctx context.Context) {
logger.Info("leader migration: starting migrated controllers.")
controllerDescriptors := NewControllerDescriptors()
controllerDescriptors = filteredControllerDescriptors(controllerDescriptors, leaderMigrator.FilterFunc, leadermigration.ControllerMigrated)
// DO NOT start saTokenController under migration lock
delete(controllerDescriptors, names.ServiceAccountTokenController)
run(ctx, controllerDescriptors)
},
OnStoppedLeading: func() {
logger.Error(nil, "migration leaderelection lost")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
},
})
}
<-stopCh
return nil
}
// ControllerContext defines the context object for controller
type ControllerContext struct {
// ClientBuilder will provide a client for this controller to use
ClientBuilder clientbuilder.ControllerClientBuilder
// InformerFactory gives access to informers for the controller.
InformerFactory informers.SharedInformerFactory
// ObjectOrMetadataInformerFactory gives access to informers for typed resources
// and dynamic resources by their metadata. All generic controllers currently use
// object metadata - if a future controller needs access to the full object this
// would become GenericInformerFactory and take a dynamic client.
ObjectOrMetadataInformerFactory informerfactory.InformerFactory
// ComponentConfig provides access to init options for a given controller
ComponentConfig kubectrlmgrconfig.KubeControllerManagerConfiguration
// DeferredDiscoveryRESTMapper is a RESTMapper that will defer
// initialization of the RESTMapper until the first mapping is
// requested.
RESTMapper *restmapper.DeferredDiscoveryRESTMapper
// Cloud is the cloud provider interface for the controllers to use.
// It must be initialized and ready to use.
Cloud cloudprovider.Interface
// Control for which control loops to be run
// IncludeCloudLoops is for a kube-controller-manager running all loops
// ExternalLoops is for a kube-controller-manager running with a cloud-controller-manager
LoopMode ControllerLoopMode
// InformersStarted is closed after all of the controllers have been initialized and are running. After this point it is safe,
// for an individual controller to start the shared informers. Before it is closed, they should not.
InformersStarted chan struct{}
// ResyncPeriod generates a duration each time it is invoked; this is so that
// multiple controllers don't get into lock-step and all hammer the apiserver
// with list requests simultaneously.
ResyncPeriod func() time.Duration
// ControllerManagerMetrics provides a proxy to set controller manager specific metrics.
ControllerManagerMetrics *controllersmetrics.ControllerManagerMetrics
// GraphBuilder gives an access to dependencyGraphBuilder which keeps tracks of resources in the cluster
GraphBuilder *garbagecollector.GraphBuilder
}
// IsControllerEnabled checks if the context's controllers enabled or not
func (c ControllerContext) IsControllerEnabled(controllerDescriptor *ControllerDescriptor) bool {
controllersDisabledByDefault := sets.NewString()
if controllerDescriptor.IsDisabledByDefault() {
controllersDisabledByDefault.Insert(controllerDescriptor.Name())
}
return genericcontrollermanager.IsControllerEnabled(controllerDescriptor.Name(), controllersDisabledByDefault, c.ComponentConfig.Generic.Controllers)
}
// InitFunc is used to launch a particular controller. It returns a controller
// that can optionally implement other interfaces so that the controller manager
// can support the requested features.
// The returned controller may be nil, which will be considered an anonymous controller
// that requests no additional features from the controller manager.
// Any error returned will cause the controller process to `Fatal`
// The bool indicates whether the controller was enabled.
type InitFunc func(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller controller.Interface, enabled bool, err error)
type ControllerDescriptor struct {
name string
initFunc InitFunc
requiredFeatureGates []featuregate.Feature
aliases []string
isDisabledByDefault bool
isCloudProviderController bool
requiresSpecialHandling bool
}
func (r *ControllerDescriptor) Name() string {
return r.name
}
func (r *ControllerDescriptor) GetInitFunc() InitFunc {
return r.initFunc
}
func (r *ControllerDescriptor) GetRequiredFeatureGates() []featuregate.Feature {
return append([]featuregate.Feature(nil), r.requiredFeatureGates...)
}
// GetAliases returns aliases to ensure backwards compatibility and should never be removed!
// Only addition of new aliases is allowed, and only when a canonical name is changed (please see CHANGE POLICY of controller names)
func (r *ControllerDescriptor) GetAliases() []string {
return append([]string(nil), r.aliases...)
}
func (r *ControllerDescriptor) IsDisabledByDefault() bool {
return r.isDisabledByDefault
}
func (r *ControllerDescriptor) IsCloudProviderController() bool {
return r.isCloudProviderController
}
// RequiresSpecialHandling should return true only in a special non-generic controllers like ServiceAccountTokenController
func (r *ControllerDescriptor) RequiresSpecialHandling() bool {
return r.requiresSpecialHandling
}
// KnownControllers returns all known controllers's name
func KnownControllers() []string {
return sets.StringKeySet(NewControllerDescriptors()).List()
}
// ControllerAliases returns a mapping of aliases to canonical controller names
func ControllerAliases() map[string]string {
aliases := map[string]string{}
for name, c := range NewControllerDescriptors() {
for _, alias := range c.GetAliases() {
aliases[alias] = name
}
}
return aliases
}
func ControllersDisabledByDefault() []string {
var controllersDisabledByDefault []string
for name, c := range NewControllerDescriptors() {
if c.IsDisabledByDefault() {
controllersDisabledByDefault = append(controllersDisabledByDefault, name)
}
}
sort.Strings(controllersDisabledByDefault)
return controllersDisabledByDefault
}
// NewControllerDescriptors is a public map of named controller groups (you can start more than one in an init func)
// paired to their ControllerDescriptor wrapper object that includes InitFunc.
// This allows for structured downstream composition and subdivision.
func NewControllerDescriptors() map[string]*ControllerDescriptor {
controllers := map[string]*ControllerDescriptor{}
aliases := sets.NewString()
// All the controllers must fulfil common constraints, or else we will explode.
register := func(controllerDesc *ControllerDescriptor) {
if controllerDesc == nil {
panic("received nil controller for a registration")
}
name := controllerDesc.Name()
if len(name) == 0 {
panic("received controller without a name for a registration")
}
if _, found := controllers[name]; found {
panic(fmt.Sprintf("controller name %q was registered twice", name))
}
if controllerDesc.GetInitFunc() == nil {
panic(fmt.Sprintf("controller %q does not have an init function", name))
}
for _, alias := range controllerDesc.GetAliases() {
if aliases.Has(alias) {
panic(fmt.Sprintf("controller %q has a duplicate alias %q", name, alias))
}
aliases.Insert(alias)
}
controllers[name] = controllerDesc
}
// First add "special" controllers that aren't initialized normally. These controllers cannot be initialized
// in the main controller loop initialization, so we add them here only for the metadata and duplication detection.
// app.ControllerDescriptor#RequiresSpecialHandling should return true for such controllers
// The only known special case is the ServiceAccountTokenController which *must* be started
// first to ensure that the SA tokens for future controllers will exist. Think very carefully before adding new
// special controllers.
register(newServiceAccountTokenControllerDescriptor(nil))
register(newEndpointsControllerDescriptor())
register(newEndpointSliceControllerDescriptor())
register(newEndpointSliceMirroringControllerDescriptor())
register(newReplicationControllerDescriptor())
register(newPodGarbageCollectorControllerDescriptor())
register(newResourceQuotaControllerDescriptor())
register(newNamespaceControllerDescriptor())
register(newServiceAccountControllerDescriptor())
register(newGarbageCollectorControllerDescriptor())
register(newDaemonSetControllerDescriptor())
register(newJobControllerDescriptor())
register(newDeploymentControllerDescriptor())
register(newReplicaSetControllerDescriptor())
register(newHorizontalPodAutoscalerControllerDescriptor())
register(newDisruptionControllerDescriptor())
register(newStatefulSetControllerDescriptor())
register(newCronJobControllerDescriptor())
register(newCertificateSigningRequestSigningControllerDescriptor())
register(newCertificateSigningRequestApprovingControllerDescriptor())
register(newCertificateSigningRequestCleanerControllerDescriptor())
register(newTTLControllerDescriptor())
register(newBootstrapSignerControllerDescriptor())
register(newTokenCleanerControllerDescriptor())
register(newNodeIpamControllerDescriptor())
register(newNodeLifecycleControllerDescriptor())
register(newServiceLBControllerDescriptor()) // cloud provider controller
register(newNodeRouteControllerDescriptor()) // cloud provider controller
register(newCloudNodeLifecycleControllerDescriptor()) // cloud provider controller
// TODO: persistent volume controllers into the IncludeCloudLoops only set as a cloud provider controller.
register(newPersistentVolumeBinderControllerDescriptor())
register(newPersistentVolumeAttachDetachControllerDescriptor())
register(newPersistentVolumeExpanderControllerDescriptor())
register(newClusterRoleAggregrationControllerDescriptor())
register(newPersistentVolumeClaimProtectionControllerDescriptor())
register(newPersistentVolumeProtectionControllerDescriptor())
register(newTTLAfterFinishedControllerDescriptor())
register(newRootCACertificatePublisherControllerDescriptor())
register(newEphemeralVolumeControllerDescriptor())
// feature gated
register(newStorageVersionGarbageCollectorControllerDescriptor())
register(newResourceClaimControllerDescriptor())
register(newLegacyServiceAccountTokenCleanerControllerDescriptor())
register(newValidatingAdmissionPolicyStatusControllerDescriptor())
register(newTaintEvictionControllerDescriptor())
register(newServiceCIDRsControllerDescriptor())
register(newStorageVersionMigratorControllerDescriptor())
for _, alias := range aliases.UnsortedList() {
if _, ok := controllers[alias]; ok {
panic(fmt.Sprintf("alias %q conflicts with a controller name", alias))
}
}
return controllers
}
// CreateControllerContext creates a context struct containing references to resources needed by the
// controllers such as the cloud provider and clientBuilder. rootClientBuilder is only used for
// the shared-informers client and token controller.
func CreateControllerContext(ctx context.Context, s *config.CompletedConfig, rootClientBuilder, clientBuilder clientbuilder.ControllerClientBuilder) (ControllerContext, error) {
// Informer transform to trim ManagedFields for memory efficiency.
trim := func(obj interface{}) (interface{}, error) {
if accessor, err := meta.Accessor(obj); err == nil {
if accessor.GetManagedFields() != nil {
accessor.SetManagedFields(nil)
}
}
return obj, nil
}
versionedClient := rootClientBuilder.ClientOrDie("shared-informers")
sharedInformers := informers.NewSharedInformerFactoryWithOptions(versionedClient, ResyncPeriod(s)(), informers.WithTransform(trim))
metadataClient := metadata.NewForConfigOrDie(rootClientBuilder.ConfigOrDie("metadata-informers"))
metadataInformers := metadatainformer.NewSharedInformerFactoryWithOptions(metadataClient, ResyncPeriod(s)(), metadatainformer.WithTransform(trim))
// If apiserver is not running we should wait for some time and fail only then. This is particularly
// important when we start apiserver and controller manager at the same time.
if err := genericcontrollermanager.WaitForAPIServer(versionedClient, 10*time.Second); err != nil {
return ControllerContext{}, fmt.Errorf("failed to wait for apiserver being healthy: %v", err)
}
// Use a discovery client capable of being refreshed.
discoveryClient := rootClientBuilder.DiscoveryClientOrDie("controller-discovery")
cachedClient := cacheddiscovery.NewMemCacheClient(discoveryClient)
restMapper := restmapper.NewDeferredDiscoveryRESTMapper(cachedClient)
go wait.Until(func() {
restMapper.Reset()
}, 30*time.Second, ctx.Done())
cloud, loopMode, err := createCloudProvider(klog.FromContext(ctx), s.ComponentConfig.KubeCloudShared.CloudProvider.Name, s.ComponentConfig.KubeCloudShared.ExternalCloudVolumePlugin,
s.ComponentConfig.KubeCloudShared.CloudProvider.CloudConfigFile, s.ComponentConfig.KubeCloudShared.AllowUntaggedCloud, sharedInformers)
if err != nil {
return ControllerContext{}, err
}
controllerContext := ControllerContext{
ClientBuilder: clientBuilder,
InformerFactory: sharedInformers,
ObjectOrMetadataInformerFactory: informerfactory.NewInformerFactory(sharedInformers, metadataInformers),
ComponentConfig: s.ComponentConfig,
RESTMapper: restMapper,
Cloud: cloud,
LoopMode: loopMode,
InformersStarted: make(chan struct{}),
ResyncPeriod: ResyncPeriod(s),
ControllerManagerMetrics: controllersmetrics.NewControllerManagerMetrics("kube-controller-manager"),
}
if controllerContext.ComponentConfig.GarbageCollectorController.EnableGarbageCollector &&
controllerContext.IsControllerEnabled(NewControllerDescriptors()[names.GarbageCollectorController]) {
ignoredResources := make(map[schema.GroupResource]struct{})
for _, r := range controllerContext.ComponentConfig.GarbageCollectorController.GCIgnoredResources {
ignoredResources[schema.GroupResource{Group: r.Group, Resource: r.Resource}] = struct{}{}
}
controllerContext.GraphBuilder = garbagecollector.NewDependencyGraphBuilder(
ctx,
metadataClient,
controllerContext.RESTMapper,
ignoredResources,
controllerContext.ObjectOrMetadataInformerFactory,
controllerContext.InformersStarted,
)
}
controllersmetrics.Register()
return controllerContext, nil
}
// StartControllers starts a set of controllers with a specified ControllerContext
func StartControllers(ctx context.Context, controllerCtx ControllerContext, controllerDescriptors map[string]*ControllerDescriptor,
unsecuredMux *mux.PathRecorderMux, healthzHandler *controllerhealthz.MutableHealthzHandler) error {
var controllerChecks []healthz.HealthChecker
// Always start the SA token controller first using a full-power client, since it needs to mint tokens for the rest
// If this fails, just return here and fail since other controllers won't be able to get credentials.
if serviceAccountTokenControllerDescriptor, ok := controllerDescriptors[names.ServiceAccountTokenController]; ok {
check, err := StartController(ctx, controllerCtx, serviceAccountTokenControllerDescriptor, unsecuredMux)
if err != nil {
return err
}
if check != nil {
// HealthChecker should be present when controller has started
controllerChecks = append(controllerChecks, check)
}
}
// Initialize the cloud provider with a reference to the clientBuilder only after token controller
// has started in case the cloud provider uses the client builder.
if controllerCtx.Cloud != nil {
controllerCtx.Cloud.Initialize(controllerCtx.ClientBuilder, ctx.Done())
}
// Each controller is passed a context where the logger has the name of
// the controller set through WithName. That name then becomes the prefix of
// of all log messages emitted by that controller.
//
// In StartController, an explicit "controller" key is used instead, for two reasons:
// - while contextual logging is alpha, klog.LoggerWithName is still a no-op,
// so we cannot rely on it yet to add the name
// - it allows distinguishing between log entries emitted by the controller
// and those emitted for it - this is a bit debatable and could be revised.
for _, controllerDesc := range controllerDescriptors {
if controllerDesc.RequiresSpecialHandling() {
continue
}
check, err := StartController(ctx, controllerCtx, controllerDesc, unsecuredMux)
if err != nil {
return err
}
if check != nil {
// HealthChecker should be present when controller has started
controllerChecks = append(controllerChecks, check)
}
}
healthzHandler.AddHealthChecker(controllerChecks...)
return nil
}
// StartController starts a controller with a specified ControllerContext
// and performs required pre- and post- checks/actions
func StartController(ctx context.Context, controllerCtx ControllerContext, controllerDescriptor *ControllerDescriptor,
unsecuredMux *mux.PathRecorderMux) (healthz.HealthChecker, error) {
logger := klog.FromContext(ctx)
controllerName := controllerDescriptor.Name()
for _, featureGate := range controllerDescriptor.GetRequiredFeatureGates() {
if !utilfeature.DefaultFeatureGate.Enabled(featureGate) {
logger.Info("Controller is disabled by a feature gate", "controller", controllerName, "requiredFeatureGates", controllerDescriptor.GetRequiredFeatureGates())
return nil, nil
}
}
if controllerDescriptor.IsCloudProviderController() && controllerCtx.LoopMode != IncludeCloudLoops {
logger.Info("Skipping a cloud provider controller", "controller", controllerName, "loopMode", controllerCtx.LoopMode)
return nil, nil
}
if !controllerCtx.IsControllerEnabled(controllerDescriptor) {
logger.Info("Warning: controller is disabled", "controller", controllerName)
return nil, nil
}
time.Sleep(wait.Jitter(controllerCtx.ComponentConfig.Generic.ControllerStartInterval.Duration, ControllerStartJitter))
logger.V(1).Info("Starting controller", "controller", controllerName)
initFunc := controllerDescriptor.GetInitFunc()
ctrl, started, err := initFunc(klog.NewContext(ctx, klog.LoggerWithName(logger, controllerName)), controllerCtx, controllerName)
if err != nil {
logger.Error(err, "Error starting controller", "controller", controllerName)
return nil, err
}
if !started {
logger.Info("Warning: skipping controller", "controller", controllerName)
return nil, nil
}
check := controllerhealthz.NamedPingChecker(controllerName)
if ctrl != nil {
// check if the controller supports and requests a debugHandler
// and it needs the unsecuredMux to mount the handler onto.
if debuggable, ok := ctrl.(controller.Debuggable); ok && unsecuredMux != nil {
if debugHandler := debuggable.DebuggingHandler(); debugHandler != nil {
basePath := "/debug/controllers/" + controllerName
unsecuredMux.UnlistedHandle(basePath, http.StripPrefix(basePath, debugHandler))
unsecuredMux.UnlistedHandlePrefix(basePath+"/", http.StripPrefix(basePath, debugHandler))
}
}
if healthCheckable, ok := ctrl.(controller.HealthCheckable); ok {
if realCheck := healthCheckable.HealthChecker(); realCheck != nil {
check = controllerhealthz.NamedHealthChecker(controllerName, realCheck)
}
}
}
logger.Info("Started controller", "controller", controllerName)
return check, nil
}
// serviceAccountTokenControllerStarter is special because it must run first to set up permissions for other controllers.
// It cannot use the "normal" client builder, so it tracks its own.
func newServiceAccountTokenControllerDescriptor(rootClientBuilder clientbuilder.ControllerClientBuilder) *ControllerDescriptor {
return &ControllerDescriptor{
name: names.ServiceAccountTokenController,
aliases: []string{"serviceaccount-token"},
initFunc: func(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {
return startServiceAccountTokenController(ctx, controllerContext, controllerName, rootClientBuilder)
},
// will make sure it runs first before other controllers
requiresSpecialHandling: true,
}
}
func startServiceAccountTokenController(ctx context.Context, controllerContext ControllerContext, controllerName string, rootClientBuilder clientbuilder.ControllerClientBuilder) (controller.Interface, bool, error) {
logger := klog.FromContext(ctx)
if len(controllerContext.ComponentConfig.SAController.ServiceAccountKeyFile) == 0 {
logger.Info("Controller is disabled because there is no private key", "controller", controllerName)
return nil, false, nil
}
privateKey, err := keyutil.PrivateKeyFromFile(controllerContext.ComponentConfig.SAController.ServiceAccountKeyFile)
if err != nil {
return nil, true, fmt.Errorf("error reading key for service account token controller: %v", err)
}
var rootCA []byte
if controllerContext.ComponentConfig.SAController.RootCAFile != "" {
if rootCA, err = readCA(controllerContext.ComponentConfig.SAController.RootCAFile); err != nil {
return nil, true, fmt.Errorf("error parsing root-ca-file at %s: %v", controllerContext.ComponentConfig.SAController.RootCAFile, err)
}
} else {
rootCA = rootClientBuilder.ConfigOrDie("tokens-controller").CAData
}
tokenGenerator, err := serviceaccount.JWTTokenGenerator(serviceaccount.LegacyIssuer, privateKey)
if err != nil {
return nil, false, fmt.Errorf("failed to build token generator: %v", err)
}
tokenController, err := serviceaccountcontroller.NewTokensController(
controllerContext.InformerFactory.Core().V1().ServiceAccounts(),
controllerContext.InformerFactory.Core().V1().Secrets(),
rootClientBuilder.ClientOrDie("tokens-controller"),
serviceaccountcontroller.TokensControllerOptions{
TokenGenerator: tokenGenerator,
RootCA: rootCA,
},
)
if err != nil {
return nil, true, fmt.Errorf("error creating Tokens controller: %v", err)
}
go tokenController.Run(ctx, int(controllerContext.ComponentConfig.SAController.ConcurrentSATokenSyncs))
// start the first set of informers now so that other controllers can start
controllerContext.InformerFactory.Start(ctx.Done())
return nil, true, nil
}
func readCA(file string) ([]byte, error) {
rootCA, err := os.ReadFile(file)
if err != nil {
return nil, err
}
if _, err := certutil.ParseCertsPEM(rootCA); err != nil {
return nil, err
}
return rootCA, err
}
// createClientBuilders creates clientBuilder and rootClientBuilder from the given configuration
func createClientBuilders(logger klog.Logger, c *config.CompletedConfig) (clientBuilder clientbuilder.ControllerClientBuilder, rootClientBuilder clientbuilder.ControllerClientBuilder) {
rootClientBuilder = clientbuilder.SimpleControllerClientBuilder{
ClientConfig: c.Kubeconfig,
}
if c.ComponentConfig.KubeCloudShared.UseServiceAccountCredentials {
if len(c.ComponentConfig.SAController.ServiceAccountKeyFile) == 0 {
// It's possible another controller process is creating the tokens for us.
// If one isn't, we'll timeout and exit when our client builder is unable to create the tokens.
logger.Info("Warning: --use-service-account-credentials was specified without providing a --service-account-private-key-file")
}
clientBuilder = clientbuilder.NewDynamicClientBuilder(
restclient.AnonymousClientConfig(c.Kubeconfig),
c.Client.CoreV1(),
metav1.NamespaceSystem)
} else {
clientBuilder = rootClientBuilder
}
return
}
// leaderElectAndRun runs the leader election, and runs the callbacks once the leader lease is acquired.
// TODO: extract this function into staging/controller-manager
func leaderElectAndRun(ctx context.Context, c *config.CompletedConfig, lockIdentity string, electionChecker *leaderelection.HealthzAdaptor, resourceLock string, leaseName string, callbacks leaderelection.LeaderCallbacks) {
logger := klog.FromContext(ctx)
rl, err := resourcelock.NewFromKubeconfig(resourceLock,
c.ComponentConfig.Generic.LeaderElection.ResourceNamespace,
leaseName,
resourcelock.ResourceLockConfig{
Identity: lockIdentity,
EventRecorder: c.EventRecorder,
},
c.Kubeconfig,
c.ComponentConfig.Generic.LeaderElection.RenewDeadline.Duration)
if err != nil {
logger.Error(err, "Error creating lock")
klog.FlushAndExit(klog.ExitFlushTimeout, 1)
}
leaderelection.RunOrDie(ctx, leaderelection.LeaderElectionConfig{
Lock: rl,
LeaseDuration: c.ComponentConfig.Generic.LeaderElection.LeaseDuration.Duration,
RenewDeadline: c.ComponentConfig.Generic.LeaderElection.RenewDeadline.Duration,
RetryPeriod: c.ComponentConfig.Generic.LeaderElection.RetryPeriod.Duration,
Callbacks: callbacks,
WatchDog: electionChecker,
Name: leaseName,
})
panic("unreachable")
}
// filteredControllerDescriptors returns all controllerDescriptors after filtering through filterFunc.
func filteredControllerDescriptors(controllerDescriptors map[string]*ControllerDescriptor, filterFunc leadermigration.FilterFunc, expected leadermigration.FilterResult) map[string]*ControllerDescriptor {
resultControllers := make(map[string]*ControllerDescriptor)
for name, controllerDesc := range controllerDescriptors {
if filterFunc(name) == expected {
resultControllers[name] = controllerDesc
}
}
return resultControllers
}