forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aws.go
2947 lines (2500 loc) · 91.2 KB
/
aws.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
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
Copyright 2014 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 aws
import (
"errors"
"fmt"
"io"
"net"
"net/url"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/golang/glog"
"gopkg.in/gcfg.v1"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/service"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/cloudprovider"
aws_credentials "k8s.io/kubernetes/pkg/credentialprovider/aws"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/volume"
)
// ProviderName is the name of this cloud provider.
const ProviderName = "aws"
// TagNameKubernetesCluster is the tag name we use to differentiate multiple
// logically independent clusters running in the same AZ
const TagNameKubernetesCluster = "KubernetesCluster"
// TagNameKubernetesService is the tag name we use to differentiate multiple
// services. Used currently for ELBs only.
const TagNameKubernetesService = "kubernetes.io/service-name"
// TagNameSubnetInternalELB is the tag name used on a subnet to designate that
// it should be used for internal ELBs
const TagNameSubnetInternalELB = "kubernetes.io/role/internal-elb"
// TagNameSubnetPublicELB is the tag name used on a subnet to designate that
// it should be used for internet ELBs
const TagNameSubnetPublicELB = "kubernetes.io/role/elb"
// ServiceAnnotationLoadBalancerInternal is the annotation used on the service
// to indicate that we want an internal ELB.
// Currently we accept only the value "0.0.0.0/0" - other values are an error.
// This lets us define more advanced semantics in future.
const ServiceAnnotationLoadBalancerInternal = "service.beta.kubernetes.io/aws-load-balancer-internal"
// ServiceAnnotationLoadBalancerProxyProtocol is the annotation used on the
// service to enable the proxy protocol on an ELB. Right now we only accept the
// value "*" which means enable the proxy protocol on all ELB backends. In the
// future we could adjust this to allow setting the proxy protocol only on
// certain backends.
const ServiceAnnotationLoadBalancerProxyProtocol = "service.beta.kubernetes.io/aws-load-balancer-proxy-protocol"
// ServiceAnnotationLoadBalancerCertificate is the annotation used on the
// service to request a secure listener. Value is a valid certificate ARN.
// For more, see http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/elb-listener-config.html
// CertARN is an IAM or CM certificate ARN, e.g. arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012
const ServiceAnnotationLoadBalancerCertificate = "service.beta.kubernetes.io/aws-load-balancer-ssl-cert"
// ServiceAnnotationLoadBalancerSSLPorts is the annotation used on the service
// to specify a comma-separated list of ports that will use SSL/HTTPS
// listeners. Defaults to '*' (all).
const ServiceAnnotationLoadBalancerSSLPorts = "service.beta.kubernetes.io/aws-load-balancer-ssl-ports"
// ServiceAnnotationLoadBalancerBEProtocol is the annotation used on the service
// to specify the protocol spoken by the backend (pod) behind a secure listener.
// Only inspected when `aws-load-balancer-ssl-cert` is used.
// If `http` (default) or `https`, an HTTPS listener that terminates the
// connection and parses headers is created.
// If set to `ssl` or `tcp`, a "raw" SSL listener is used.
const ServiceAnnotationLoadBalancerBEProtocol = "service.beta.kubernetes.io/aws-load-balancer-backend-protocol"
// Maps from backend protocol to ELB protocol
var backendProtocolMapping = map[string]string{
"https": "https",
"http": "https",
"ssl": "ssl",
"tcp": "ssl",
}
// MaxReadThenCreateRetries sets the maximum number of attempts we will make when
// we read to see if something exists and then try to create it if we didn't find it.
// This can fail once in a consistent system if done in parallel
// In an eventually consistent system, it could fail unboundedly
const MaxReadThenCreateRetries = 30
// DefaultVolumeType specifies which storage to use for newly created Volumes
// TODO: Remove when user/admin can configure volume types and thus we don't
// need hardcoded defaults.
const DefaultVolumeType = "gp2"
// DefaultMaxEBSVolumes is the limit for volumes attached to an instance.
// Amazon recommends no more than 40; the system root volume uses at least one.
// See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/volume_limits.html#linux-specific-volume-limits
const DefaultMaxEBSVolumes = 39
// Used to call aws_credentials.Init() just once
var once sync.Once
// Services is an abstraction over AWS, to allow mocking/other implementations
type Services interface {
Compute(region string) (EC2, error)
LoadBalancing(region string) (ELB, error)
Autoscaling(region string) (ASG, error)
Metadata() (EC2Metadata, error)
}
// EC2 is an abstraction over AWS', to allow mocking/other implementations
// Note that the DescribeX functions return a list, so callers don't need to deal with paging
// TODO: Should we rename this to AWS (EBS & ELB are not technically part of EC2)
type EC2 interface {
// Query EC2 for instances matching the filter
DescribeInstances(request *ec2.DescribeInstancesInput) ([]*ec2.Instance, error)
// Attach a volume to an instance
AttachVolume(*ec2.AttachVolumeInput) (*ec2.VolumeAttachment, error)
// Detach a volume from an instance it is attached to
DetachVolume(request *ec2.DetachVolumeInput) (resp *ec2.VolumeAttachment, err error)
// Lists volumes
DescribeVolumes(request *ec2.DescribeVolumesInput) ([]*ec2.Volume, error)
// Create an EBS volume
CreateVolume(request *ec2.CreateVolumeInput) (resp *ec2.Volume, err error)
// Delete an EBS volume
DeleteVolume(*ec2.DeleteVolumeInput) (*ec2.DeleteVolumeOutput, error)
DescribeSecurityGroups(request *ec2.DescribeSecurityGroupsInput) ([]*ec2.SecurityGroup, error)
CreateSecurityGroup(*ec2.CreateSecurityGroupInput) (*ec2.CreateSecurityGroupOutput, error)
DeleteSecurityGroup(request *ec2.DeleteSecurityGroupInput) (*ec2.DeleteSecurityGroupOutput, error)
AuthorizeSecurityGroupIngress(*ec2.AuthorizeSecurityGroupIngressInput) (*ec2.AuthorizeSecurityGroupIngressOutput, error)
RevokeSecurityGroupIngress(*ec2.RevokeSecurityGroupIngressInput) (*ec2.RevokeSecurityGroupIngressOutput, error)
DescribeSubnets(*ec2.DescribeSubnetsInput) ([]*ec2.Subnet, error)
CreateTags(*ec2.CreateTagsInput) (*ec2.CreateTagsOutput, error)
DescribeRouteTables(request *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error)
CreateRoute(request *ec2.CreateRouteInput) (*ec2.CreateRouteOutput, error)
DeleteRoute(request *ec2.DeleteRouteInput) (*ec2.DeleteRouteOutput, error)
ModifyInstanceAttribute(request *ec2.ModifyInstanceAttributeInput) (*ec2.ModifyInstanceAttributeOutput, error)
}
// ELB is a simple pass-through of AWS' ELB client interface, which allows for testing
type ELB interface {
CreateLoadBalancer(*elb.CreateLoadBalancerInput) (*elb.CreateLoadBalancerOutput, error)
DeleteLoadBalancer(*elb.DeleteLoadBalancerInput) (*elb.DeleteLoadBalancerOutput, error)
DescribeLoadBalancers(*elb.DescribeLoadBalancersInput) (*elb.DescribeLoadBalancersOutput, error)
RegisterInstancesWithLoadBalancer(*elb.RegisterInstancesWithLoadBalancerInput) (*elb.RegisterInstancesWithLoadBalancerOutput, error)
DeregisterInstancesFromLoadBalancer(*elb.DeregisterInstancesFromLoadBalancerInput) (*elb.DeregisterInstancesFromLoadBalancerOutput, error)
CreateLoadBalancerPolicy(*elb.CreateLoadBalancerPolicyInput) (*elb.CreateLoadBalancerPolicyOutput, error)
SetLoadBalancerPoliciesForBackendServer(*elb.SetLoadBalancerPoliciesForBackendServerInput) (*elb.SetLoadBalancerPoliciesForBackendServerOutput, error)
DetachLoadBalancerFromSubnets(*elb.DetachLoadBalancerFromSubnetsInput) (*elb.DetachLoadBalancerFromSubnetsOutput, error)
AttachLoadBalancerToSubnets(*elb.AttachLoadBalancerToSubnetsInput) (*elb.AttachLoadBalancerToSubnetsOutput, error)
CreateLoadBalancerListeners(*elb.CreateLoadBalancerListenersInput) (*elb.CreateLoadBalancerListenersOutput, error)
DeleteLoadBalancerListeners(*elb.DeleteLoadBalancerListenersInput) (*elb.DeleteLoadBalancerListenersOutput, error)
ApplySecurityGroupsToLoadBalancer(*elb.ApplySecurityGroupsToLoadBalancerInput) (*elb.ApplySecurityGroupsToLoadBalancerOutput, error)
ConfigureHealthCheck(*elb.ConfigureHealthCheckInput) (*elb.ConfigureHealthCheckOutput, error)
}
// ASG is a simple pass-through of the Autoscaling client interface, which
// allows for testing.
type ASG interface {
UpdateAutoScalingGroup(*autoscaling.UpdateAutoScalingGroupInput) (*autoscaling.UpdateAutoScalingGroupOutput, error)
DescribeAutoScalingGroups(*autoscaling.DescribeAutoScalingGroupsInput) (*autoscaling.DescribeAutoScalingGroupsOutput, error)
}
// EC2Metadata is an abstraction over the AWS metadata service.
type EC2Metadata interface {
// Query the EC2 metadata service (used to discover instance-id etc)
GetMetadata(path string) (string, error)
}
// VolumeOptions specifies capacity and tags for a volume.
type VolumeOptions struct {
CapacityGB int
Tags map[string]string
PVCName string
}
// Volumes is an interface for managing cloud-provisioned volumes
// TODO: Allow other clouds to implement this
type Volumes interface {
// Attach the disk to the specified instance
// instanceName can be empty to mean "the instance on which we are running"
// Returns the device (e.g. /dev/xvdf) where we attached the volume
AttachDisk(diskName string, instanceName string, readOnly bool) (string, error)
// Detach the disk from the specified instance
// instanceName can be empty to mean "the instance on which we are running"
// Returns the device where the volume was attached
DetachDisk(diskName string, instanceName string) (string, error)
// Create a volume with the specified options
CreateDisk(volumeOptions *VolumeOptions) (volumeName string, err error)
// Delete the specified volume
// Returns true iff the volume was deleted
// If the was not found, returns (false, nil)
DeleteDisk(volumeName string) (bool, error)
// Get labels to apply to volume on creation
GetVolumeLabels(volumeName string) (map[string]string, error)
// Get volume's disk path from volume name
// return the device path where the volume is attached
GetDiskPath(volumeName string) (string, error)
// Check if the volume is already attached to the instance
DiskIsAttached(diskName, instanceID string) (bool, error)
}
// InstanceGroups is an interface for managing cloud-managed instance groups / autoscaling instance groups
// TODO: Allow other clouds to implement this
type InstanceGroups interface {
// Set the size to the fixed size
ResizeInstanceGroup(instanceGroupName string, size int) error
// Queries the cloud provider for information about the specified instance group
DescribeInstanceGroup(instanceGroupName string) (InstanceGroupInfo, error)
}
// InstanceGroupInfo is returned by InstanceGroups.Describe, and exposes information about the group.
type InstanceGroupInfo interface {
// The number of instances currently running under control of this group
CurrentSize() (int, error)
}
// Cloud is an implementation of Interface, LoadBalancer and Instances for Amazon Web Services.
type Cloud struct {
ec2 EC2
elb ELB
asg ASG
metadata EC2Metadata
cfg *CloudConfig
region string
vpcID string
filterTags map[string]string
// The AWS instance that we are running on
// Note that we cache some state in awsInstance (mountpoints), so we must preserve the instance
selfAWSInstance *awsInstance
mutex sync.Mutex
lastNodeNames sets.String
lastInstancesByNodeNames []*ec2.Instance
}
var _ Volumes = &Cloud{}
// CloudConfig wraps the settings for the AWS cloud provider.
type CloudConfig struct {
Global struct {
// TODO: Is there any use for this? We can get it from the instance metadata service
// Maybe if we're not running on AWS, e.g. bootstrap; for now it is not very useful
Zone string
KubernetesClusterTag string
//The aws provider creates an inbound rule per load balancer on the node security
//group. However, this can run into the AWS security group rule limit of 50 if
//many LoadBalancers are created.
//
//This flag disables the automatic ingress creation. It requires that the user
//has setup a rule that allows inbound traffic on kubelet ports from the
//local VPC subnet (so load balancers can access it). E.g. 10.82.0.0/16 30000-32000.
DisableSecurityGroupIngress bool
}
}
// awsSdkEC2 is an implementation of the EC2 interface, backed by aws-sdk-go
type awsSdkEC2 struct {
ec2 *ec2.EC2
}
type awsSDKProvider struct {
creds *credentials.Credentials
mutex sync.Mutex
regionDelayers map[string]*CrossRequestRetryDelay
}
func newAWSSDKProvider(creds *credentials.Credentials) *awsSDKProvider {
return &awsSDKProvider{
creds: creds,
regionDelayers: make(map[string]*CrossRequestRetryDelay),
}
}
func (p *awsSDKProvider) addHandlers(regionName string, h *request.Handlers) {
h.Sign.PushFrontNamed(request.NamedHandler{
Name: "k8s/logger",
Fn: awsHandlerLogger,
})
delayer := p.getCrossRequestRetryDelay(regionName)
if delayer != nil {
h.Sign.PushFrontNamed(request.NamedHandler{
Name: "k8s/delay-presign",
Fn: delayer.BeforeSign,
})
h.AfterRetry.PushFrontNamed(request.NamedHandler{
Name: "k8s/delay-afterretry",
Fn: delayer.AfterRetry,
})
}
}
// Get a CrossRequestRetryDelay, scoped to the region, not to the request.
// This means that when we hit a limit on a call, we will delay _all_ calls to the API.
// We do this to protect the AWS account from becoming overloaded and effectively locked.
// We also log when we hit request limits.
// Note that this delays the current goroutine; this is bad behaviour and will
// likely cause k8s to become slow or unresponsive for cloud operations.
// However, this throttle is intended only as a last resort. When we observe
// this throttling, we need to address the root cause (e.g. add a delay to a
// controller retry loop)
func (p *awsSDKProvider) getCrossRequestRetryDelay(regionName string) *CrossRequestRetryDelay {
p.mutex.Lock()
defer p.mutex.Unlock()
delayer, found := p.regionDelayers[regionName]
if !found {
delayer = NewCrossRequestRetryDelay()
p.regionDelayers[regionName] = delayer
}
return delayer
}
func (p *awsSDKProvider) Compute(regionName string) (EC2, error) {
service := ec2.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &service.Handlers)
ec2 := &awsSdkEC2{
ec2: service,
}
return ec2, nil
}
func (p *awsSDKProvider) LoadBalancing(regionName string) (ELB, error) {
elbClient := elb.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &elbClient.Handlers)
return elbClient, nil
}
func (p *awsSDKProvider) Autoscaling(regionName string) (ASG, error) {
client := autoscaling.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &client.Handlers)
return client, nil
}
func (p *awsSDKProvider) Metadata() (EC2Metadata, error) {
client := ec2metadata.New(session.New(&aws.Config{}))
return client, nil
}
func stringPointerArray(orig []string) []*string {
if orig == nil {
return nil
}
n := make([]*string, len(orig))
for i := range orig {
n[i] = &orig[i]
}
return n
}
func isNilOrEmpty(s *string) bool {
return s == nil || *s == ""
}
func orEmpty(s *string) string {
if s == nil {
return ""
}
return *s
}
func newEc2Filter(name string, value string) *ec2.Filter {
filter := &ec2.Filter{
Name: aws.String(name),
Values: []*string{
aws.String(value),
},
}
return filter
}
// AddSSHKeyToAllInstances is currently not implemented.
func (c *Cloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
return errors.New("unimplemented")
}
// CurrentNodeName returns the name of the current node
func (c *Cloud) CurrentNodeName(hostname string) (string, error) {
return c.selfAWSInstance.nodeName, nil
}
// Implementation of EC2.Instances
func (s *awsSdkEC2) DescribeInstances(request *ec2.DescribeInstancesInput) ([]*ec2.Instance, error) {
// Instances are paged
results := []*ec2.Instance{}
var nextToken *string
for {
response, err := s.ec2.DescribeInstances(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS instances: %v", err)
}
for _, reservation := range response.Reservations {
results = append(results, reservation.Instances...)
}
nextToken = response.NextToken
if isNilOrEmpty(nextToken) {
break
}
request.NextToken = nextToken
}
return results, nil
}
// Implements EC2.DescribeSecurityGroups
func (s *awsSdkEC2) DescribeSecurityGroups(request *ec2.DescribeSecurityGroupsInput) ([]*ec2.SecurityGroup, error) {
// Security groups are not paged
response, err := s.ec2.DescribeSecurityGroups(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS security groups: %v", err)
}
return response.SecurityGroups, nil
}
func (s *awsSdkEC2) AttachVolume(request *ec2.AttachVolumeInput) (*ec2.VolumeAttachment, error) {
return s.ec2.AttachVolume(request)
}
func (s *awsSdkEC2) DetachVolume(request *ec2.DetachVolumeInput) (*ec2.VolumeAttachment, error) {
return s.ec2.DetachVolume(request)
}
func (s *awsSdkEC2) DescribeVolumes(request *ec2.DescribeVolumesInput) ([]*ec2.Volume, error) {
// Volumes are paged
results := []*ec2.Volume{}
var nextToken *string
for {
response, err := s.ec2.DescribeVolumes(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS volumes: %v", err)
}
results = append(results, response.Volumes...)
nextToken = response.NextToken
if isNilOrEmpty(nextToken) {
break
}
request.NextToken = nextToken
}
return results, nil
}
func (s *awsSdkEC2) CreateVolume(request *ec2.CreateVolumeInput) (resp *ec2.Volume, err error) {
return s.ec2.CreateVolume(request)
}
func (s *awsSdkEC2) DeleteVolume(request *ec2.DeleteVolumeInput) (*ec2.DeleteVolumeOutput, error) {
return s.ec2.DeleteVolume(request)
}
func (s *awsSdkEC2) DescribeSubnets(request *ec2.DescribeSubnetsInput) ([]*ec2.Subnet, error) {
// Subnets are not paged
response, err := s.ec2.DescribeSubnets(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS subnets: %v", err)
}
return response.Subnets, nil
}
func (s *awsSdkEC2) CreateSecurityGroup(request *ec2.CreateSecurityGroupInput) (*ec2.CreateSecurityGroupOutput, error) {
return s.ec2.CreateSecurityGroup(request)
}
func (s *awsSdkEC2) DeleteSecurityGroup(request *ec2.DeleteSecurityGroupInput) (*ec2.DeleteSecurityGroupOutput, error) {
return s.ec2.DeleteSecurityGroup(request)
}
func (s *awsSdkEC2) AuthorizeSecurityGroupIngress(request *ec2.AuthorizeSecurityGroupIngressInput) (*ec2.AuthorizeSecurityGroupIngressOutput, error) {
return s.ec2.AuthorizeSecurityGroupIngress(request)
}
func (s *awsSdkEC2) RevokeSecurityGroupIngress(request *ec2.RevokeSecurityGroupIngressInput) (*ec2.RevokeSecurityGroupIngressOutput, error) {
return s.ec2.RevokeSecurityGroupIngress(request)
}
func (s *awsSdkEC2) CreateTags(request *ec2.CreateTagsInput) (*ec2.CreateTagsOutput, error) {
return s.ec2.CreateTags(request)
}
func (s *awsSdkEC2) DescribeRouteTables(request *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error) {
// Not paged
response, err := s.ec2.DescribeRouteTables(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS route tables: %v", err)
}
return response.RouteTables, nil
}
func (s *awsSdkEC2) CreateRoute(request *ec2.CreateRouteInput) (*ec2.CreateRouteOutput, error) {
return s.ec2.CreateRoute(request)
}
func (s *awsSdkEC2) DeleteRoute(request *ec2.DeleteRouteInput) (*ec2.DeleteRouteOutput, error) {
return s.ec2.DeleteRoute(request)
}
func (s *awsSdkEC2) ModifyInstanceAttribute(request *ec2.ModifyInstanceAttributeInput) (*ec2.ModifyInstanceAttributeOutput, error) {
return s.ec2.ModifyInstanceAttribute(request)
}
func init() {
cloudprovider.RegisterCloudProvider(ProviderName, func(config io.Reader) (cloudprovider.Interface, error) {
creds := credentials.NewChainCredentials(
[]credentials.Provider{
&credentials.EnvProvider{},
&ec2rolecreds.EC2RoleProvider{
Client: ec2metadata.New(session.New(&aws.Config{})),
},
&credentials.SharedCredentialsProvider{},
})
aws := newAWSSDKProvider(creds)
return newAWSCloud(config, aws)
})
}
// readAWSCloudConfig reads an instance of AWSCloudConfig from config reader.
func readAWSCloudConfig(config io.Reader, metadata EC2Metadata) (*CloudConfig, error) {
var cfg CloudConfig
var err error
if config != nil {
err = gcfg.ReadInto(&cfg, config)
if err != nil {
return nil, err
}
}
if cfg.Global.Zone == "" {
if metadata != nil {
glog.Info("Zone not specified in configuration file; querying AWS metadata service")
cfg.Global.Zone, err = getAvailabilityZone(metadata)
if err != nil {
return nil, err
}
}
if cfg.Global.Zone == "" {
return nil, fmt.Errorf("no zone specified in configuration file")
}
}
return &cfg, nil
}
func getInstanceType(metadata EC2Metadata) (string, error) {
return metadata.GetMetadata("instance-type")
}
func getAvailabilityZone(metadata EC2Metadata) (string, error) {
return metadata.GetMetadata("placement/availability-zone")
}
func isRegionValid(region string) bool {
for _, r := range aws_credentials.AWSRegions {
if r == region {
return true
}
}
return false
}
// Derives the region from a valid az name.
// Returns an error if the az is known invalid (empty)
func azToRegion(az string) (string, error) {
if len(az) < 1 {
return "", fmt.Errorf("invalid (empty) AZ")
}
region := az[:len(az)-1]
return region, nil
}
// newAWSCloud creates a new instance of AWSCloud.
// AWSProvider and instanceId are primarily for tests
func newAWSCloud(config io.Reader, awsServices Services) (*Cloud, error) {
metadata, err := awsServices.Metadata()
if err != nil {
return nil, fmt.Errorf("error creating AWS metadata client: %v", err)
}
cfg, err := readAWSCloudConfig(config, metadata)
if err != nil {
return nil, fmt.Errorf("unable to read AWS cloud provider config file: %v", err)
}
zone := cfg.Global.Zone
if len(zone) <= 1 {
return nil, fmt.Errorf("invalid AWS zone in config file: %s", zone)
}
regionName, err := azToRegion(zone)
if err != nil {
return nil, err
}
valid := isRegionValid(regionName)
if !valid {
return nil, fmt.Errorf("not a valid AWS zone (unknown region): %s", zone)
}
ec2, err := awsServices.Compute(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS EC2 client: %v", err)
}
elb, err := awsServices.LoadBalancing(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS ELB client: %v", err)
}
asg, err := awsServices.Autoscaling(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS autoscaling client: %v", err)
}
awsCloud := &Cloud{
ec2: ec2,
elb: elb,
asg: asg,
metadata: metadata,
cfg: cfg,
region: regionName,
}
selfAWSInstance, err := awsCloud.buildSelfAWSInstance()
if err != nil {
return nil, err
}
awsCloud.selfAWSInstance = selfAWSInstance
awsCloud.vpcID = selfAWSInstance.vpcID
filterTags := map[string]string{}
if cfg.Global.KubernetesClusterTag != "" {
filterTags[TagNameKubernetesCluster] = cfg.Global.KubernetesClusterTag
} else {
// TODO: Clean up double-API query
info, err := selfAWSInstance.describeInstance()
if err != nil {
return nil, err
}
for _, tag := range info.Tags {
if orEmpty(tag.Key) == TagNameKubernetesCluster {
filterTags[TagNameKubernetesCluster] = orEmpty(tag.Value)
}
}
}
if filterTags[TagNameKubernetesCluster] == "" {
glog.Errorf("Tag %q not found; Kuberentes may behave unexpectedly.", TagNameKubernetesCluster)
}
awsCloud.filterTags = filterTags
if len(filterTags) > 0 {
glog.Infof("AWS cloud filtering on tags: %v", filterTags)
} else {
glog.Infof("AWS cloud - no tag filtering")
}
// Register handler for ECR credentials
once.Do(func() {
aws_credentials.Init()
})
return awsCloud, nil
}
// Clusters returns the list of clusters.
func (c *Cloud) Clusters() (cloudprovider.Clusters, bool) {
return nil, false
}
// ProviderName returns the cloud provider ID.
func (c *Cloud) ProviderName() string {
return ProviderName
}
// ScrubDNS filters DNS settings for pods.
func (c *Cloud) ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string) {
return nameservers, searches
}
// LoadBalancer returns an implementation of LoadBalancer for Amazon Web Services.
func (c *Cloud) LoadBalancer() (cloudprovider.LoadBalancer, bool) {
return c, true
}
// Instances returns an implementation of Instances for Amazon Web Services.
func (c *Cloud) Instances() (cloudprovider.Instances, bool) {
return c, true
}
// Zones returns an implementation of Zones for Amazon Web Services.
func (c *Cloud) Zones() (cloudprovider.Zones, bool) {
return c, true
}
// Routes returns an implementation of Routes for Amazon Web Services.
func (c *Cloud) Routes() (cloudprovider.Routes, bool) {
return c, true
}
// NodeAddresses is an implementation of Instances.NodeAddresses.
func (c *Cloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
if c.selfAWSInstance.nodeName == name || len(name) == 0 {
addresses := []api.NodeAddress{}
internalIP, err := c.metadata.GetMetadata("local-ipv4")
if err != nil {
return nil, err
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeInternalIP, Address: internalIP})
// Legacy compatibility: the private ip was the legacy host ip
addresses = append(addresses, api.NodeAddress{Type: api.NodeLegacyHostIP, Address: internalIP})
externalIP, err := c.metadata.GetMetadata("public-ipv4")
if err != nil {
//TODO: It would be nice to be able to determine the reason for the failure,
// but the AWS client masks all failures with the same error description.
glog.V(2).Info("Could not determine public IP from AWS metadata.")
} else {
addresses = append(addresses, api.NodeAddress{Type: api.NodeExternalIP, Address: externalIP})
}
return addresses, nil
}
instance, err := c.getInstanceByNodeName(name)
if err != nil {
return nil, fmt.Errorf("getInstanceByNodeName failed for %q with %v", name, err)
}
addresses := []api.NodeAddress{}
if !isNilOrEmpty(instance.PrivateIpAddress) {
ipAddress := *instance.PrivateIpAddress
ip := net.ParseIP(ipAddress)
if ip == nil {
return nil, fmt.Errorf("EC2 instance had invalid private address: %s (%s)", orEmpty(instance.InstanceId), ipAddress)
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeInternalIP, Address: ip.String()})
// Legacy compatibility: the private ip was the legacy host ip
addresses = append(addresses, api.NodeAddress{Type: api.NodeLegacyHostIP, Address: ip.String()})
}
// TODO: Other IP addresses (multiple ips)?
if !isNilOrEmpty(instance.PublicIpAddress) {
ipAddress := *instance.PublicIpAddress
ip := net.ParseIP(ipAddress)
if ip == nil {
return nil, fmt.Errorf("EC2 instance had invalid public address: %s (%s)", orEmpty(instance.InstanceId), ipAddress)
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeExternalIP, Address: ip.String()})
}
return addresses, nil
}
// ExternalID returns the cloud provider ID of the specified instance (deprecated).
func (c *Cloud) ExternalID(name string) (string, error) {
if c.selfAWSInstance.nodeName == name {
// We assume that if this is run on the instance itself, the instance exists and is alive
return c.selfAWSInstance.awsID, nil
}
// We must verify that the instance still exists
// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
instance, err := c.findInstanceByNodeName(name)
if err != nil {
return "", err
}
if instance == nil {
return "", cloudprovider.InstanceNotFound
}
return orEmpty(instance.InstanceId), nil
}
// InstanceID returns the cloud provider ID of the specified instance.
func (c *Cloud) InstanceID(name string) (string, error) {
// In the future it is possible to also return an endpoint as:
// <endpoint>/<zone>/<instanceid>
if c.selfAWSInstance.nodeName == name {
return "/" + c.selfAWSInstance.availabilityZone + "/" + c.selfAWSInstance.awsID, nil
}
inst, err := c.getInstanceByNodeName(name)
if err != nil {
return "", fmt.Errorf("getInstanceByNodeName failed for %q with %v", name, err)
}
return "/" + orEmpty(inst.Placement.AvailabilityZone) + "/" + orEmpty(inst.InstanceId), nil
}
// InstanceType returns the type of the specified instance.
func (c *Cloud) InstanceType(name string) (string, error) {
if c.selfAWSInstance.nodeName == name {
return c.selfAWSInstance.instanceType, nil
}
inst, err := c.getInstanceByNodeName(name)
if err != nil {
return "", fmt.Errorf("getInstanceByNodeName failed for %q with %v", name, err)
}
return orEmpty(inst.InstanceType), nil
}
// Return a list of instances matching regex string.
func (c *Cloud) getInstancesByRegex(regex string) ([]string, error) {
filters := []*ec2.Filter{newEc2Filter("instance-state-name", "running")}
filters = c.addFilters(filters)
request := &ec2.DescribeInstancesInput{
Filters: filters,
}
instances, err := c.ec2.DescribeInstances(request)
if err != nil {
return []string{}, err
}
if len(instances) == 0 {
return []string{}, fmt.Errorf("no instances returned")
}
if strings.HasPrefix(regex, "'") && strings.HasSuffix(regex, "'") {
glog.Infof("Stripping quotes around regex (%s)", regex)
regex = regex[1 : len(regex)-1]
}
re, err := regexp.Compile(regex)
if err != nil {
return []string{}, err
}
matchingInstances := []string{}
for _, instance := range instances {
// Only return fully-ready instances when listing instances
// (vs a query by name, where we will return it if we find it)
if orEmpty(instance.State.Name) == "pending" {
glog.V(2).Infof("Skipping EC2 instance (pending): %s", *instance.InstanceId)
continue
}
privateDNSName := orEmpty(instance.PrivateDnsName)
if privateDNSName == "" {
glog.V(2).Infof("Skipping EC2 instance (no PrivateDNSName): %s",
orEmpty(instance.InstanceId))
continue
}
for _, tag := range instance.Tags {
if orEmpty(tag.Key) == "Name" && re.MatchString(orEmpty(tag.Value)) {
matchingInstances = append(matchingInstances, privateDNSName)
break
}
}
}
glog.V(2).Infof("Matched EC2 instances: %s", matchingInstances)
return matchingInstances, nil
}
// List is an implementation of Instances.List.
func (c *Cloud) List(filter string) ([]string, error) {
// TODO: Should really use tag query. No need to go regexp.
return c.getInstancesByRegex(filter)
}
// getAllZones retrieves a list of all the zones in which nodes are running
// It currently involves querying all instances
func (c *Cloud) getAllZones() (sets.String, error) {
// We don't currently cache this; it is currently used only in volume
// creation which is expected to be a comparatively rare occurence.
// TODO: Caching / expose api.Nodes to the cloud provider?
// TODO: We could also query for subnets, I think
filters := []*ec2.Filter{newEc2Filter("instance-state-name", "running")}
filters = c.addFilters(filters)
request := &ec2.DescribeInstancesInput{
Filters: filters,
}
instances, err := c.ec2.DescribeInstances(request)
if err != nil {
return nil, err
}
if len(instances) == 0 {
return nil, fmt.Errorf("no instances returned")
}
zones := sets.NewString()
for _, instance := range instances {
// Only return fully-ready instances when listing instances
// (vs a query by name, where we will return it if we find it)
if orEmpty(instance.State.Name) == "pending" {
glog.V(2).Infof("Skipping EC2 instance (pending): %s", *instance.InstanceId)
continue
}
if instance.Placement != nil {
zone := aws.StringValue(instance.Placement.AvailabilityZone)
zones.Insert(zone)
}
}
glog.V(2).Infof("Found instances in zones %s", zones)
return zones, nil
}
// GetZone implements Zones.GetZone
func (c *Cloud) GetZone() (cloudprovider.Zone, error) {
return cloudprovider.Zone{
FailureDomain: c.selfAWSInstance.availabilityZone,
Region: c.region,
}, nil
}
// Abstraction around AWS Instance Types
// There isn't an API to get information for a particular instance type (that I know of)
type awsInstanceType struct {
}
// Used to represent a mount device for attaching an EBS volume
// This should be stored as a single letter (i.e. c, not sdc or /dev/sdc)
type mountDevice string
type awsInstance struct {
ec2 EC2
// id in AWS
awsID string
// node name in k8s
nodeName string