forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
checks.go
855 lines (744 loc) · 27.3 KB
/
checks.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
/*
Copyright 2016 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 preflight
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"crypto/tls"
"crypto/x509"
"github.com/PuerkitoBio/purell"
"github.com/blang/semver"
"github.com/spf13/pflag"
"net/url"
netutil "k8s.io/apimachinery/pkg/util/net"
apiservoptions "k8s.io/kubernetes/cmd/kube-apiserver/app/options"
cmoptions "k8s.io/kubernetes/cmd/kube-controller-manager/app/options"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/pkg/api/validation"
authzmodes "k8s.io/kubernetes/pkg/kubeapiserver/authorizer/modes"
"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
"k8s.io/kubernetes/pkg/util/initsystem"
versionutil "k8s.io/kubernetes/pkg/util/version"
kubeadmversion "k8s.io/kubernetes/pkg/version"
schoptions "k8s.io/kubernetes/plugin/cmd/kube-scheduler/app/options"
"k8s.io/kubernetes/test/e2e_node/system"
)
const (
bridgenf = "/proc/sys/net/bridge/bridge-nf-call-iptables"
bridgenf6 = "/proc/sys/net/bridge/bridge-nf-call-ip6tables"
externalEtcdRequestTimeout = time.Duration(10 * time.Second)
externalEtcdRequestRetries = 3
externalEtcdRequestInterval = time.Duration(5 * time.Second)
)
var (
minExternalEtcdVersion = semver.MustParse(kubeadmconstants.MinExternalEtcdVersion)
)
// Error defines struct for communicating error messages generated by preflight checks
type Error struct {
Msg string
}
func (e *Error) Error() string {
return fmt.Sprintf("[preflight] Some fatal errors occurred:\n%s%s", e.Msg, "[preflight] If you know what you are doing, you can skip pre-flight checks with `--skip-preflight-checks`")
}
// Checker validates the state of the system to ensure kubeadm will be
// successful as often as possilble.
type Checker interface {
Check() (warnings, errors []error)
}
// ServiceCheck verifies that the given service is enabled and active. If we do not
// detect a supported init system however, all checks are skipped and a warning is
// returned.
type ServiceCheck struct {
Service string
CheckIfActive bool
}
// Check validates if the service is enabled and active.
func (sc ServiceCheck) Check() (warnings, errors []error) {
initSystem, err := initsystem.GetInitSystem()
if err != nil {
return []error{err}, nil
}
warnings = []error{}
if !initSystem.ServiceExists(sc.Service) {
warnings = append(warnings, fmt.Errorf("%s service does not exist", sc.Service))
return warnings, nil
}
if !initSystem.ServiceIsEnabled(sc.Service) {
warnings = append(warnings,
fmt.Errorf("%s service is not enabled, please run 'systemctl enable %s.service'",
sc.Service, sc.Service))
}
if sc.CheckIfActive && !initSystem.ServiceIsActive(sc.Service) {
errors = append(errors,
fmt.Errorf("%s service is not active, please run 'systemctl start %s.service'",
sc.Service, sc.Service))
}
return warnings, errors
}
// FirewalldCheck checks if firewalld is enabled or active. If it is, warn the user that there may be problems
// if no actions are taken.
type FirewalldCheck struct {
ports []int
}
// Check validates if the firewall is enabled and active.
func (fc FirewalldCheck) Check() (warnings, errors []error) {
initSystem, err := initsystem.GetInitSystem()
if err != nil {
return []error{err}, nil
}
warnings = []error{}
if !initSystem.ServiceExists("firewalld") {
return nil, nil
}
if initSystem.ServiceIsActive("firewalld") {
warnings = append(warnings,
fmt.Errorf("firewalld is active, please ensure ports %v are open or your cluster may not function correctly",
fc.ports))
}
return warnings, errors
}
// PortOpenCheck ensures the given port is available for use.
type PortOpenCheck struct {
port int
}
// Check validates if the particular port is available.
func (poc PortOpenCheck) Check() (warnings, errors []error) {
errors = []error{}
ln, err := net.Listen("tcp", fmt.Sprintf(":%d", poc.port))
if err != nil {
errors = append(errors, fmt.Errorf("Port %d is in use", poc.port))
}
if ln != nil {
ln.Close()
}
return nil, errors
}
// IsRootCheck verifies user is root
type IsRootCheck struct{}
// Check validates if an user has root privileges.
func (irc IsRootCheck) Check() (warnings, errors []error) {
errors = []error{}
if os.Getuid() != 0 {
errors = append(errors, fmt.Errorf("user is not running as root"))
}
return nil, errors
}
// DirAvailableCheck checks if the given directory either does not exist, or is empty.
type DirAvailableCheck struct {
Path string
}
// Check validates if a directory does not exist or empty.
func (dac DirAvailableCheck) Check() (warnings, errors []error) {
errors = []error{}
// If it doesn't exist we are good:
if _, err := os.Stat(dac.Path); os.IsNotExist(err) {
return nil, nil
}
f, err := os.Open(dac.Path)
if err != nil {
errors = append(errors, fmt.Errorf("unable to check if %s is empty: %s", dac.Path, err))
return nil, errors
}
defer f.Close()
_, err = f.Readdirnames(1)
if err != io.EOF {
errors = append(errors, fmt.Errorf("%s is not empty", dac.Path))
}
return nil, errors
}
// FileAvailableCheck checks that the given file does not already exist.
type FileAvailableCheck struct {
Path string
}
// Check validates if the given file does not already exist.
func (fac FileAvailableCheck) Check() (warnings, errors []error) {
errors = []error{}
if _, err := os.Stat(fac.Path); err == nil {
errors = append(errors, fmt.Errorf("%s already exists", fac.Path))
}
return nil, errors
}
// FileExistingCheck checks that the given file does not already exist.
type FileExistingCheck struct {
Path string
}
// Check validates if the given file already exists.
func (fac FileExistingCheck) Check() (warnings, errors []error) {
errors = []error{}
if _, err := os.Stat(fac.Path); err != nil {
errors = append(errors, fmt.Errorf("%s doesn't exist", fac.Path))
}
return nil, errors
}
// FileContentCheck checks that the given file contains the string Content.
type FileContentCheck struct {
Path string
Content []byte
}
// Check validates if the given file contains the given content.
func (fcc FileContentCheck) Check() (warnings, errors []error) {
f, err := os.Open(fcc.Path)
if err != nil {
return nil, []error{fmt.Errorf("%s does not exist", fcc.Path)}
}
lr := io.LimitReader(f, int64(len(fcc.Content)))
defer f.Close()
buf := &bytes.Buffer{}
_, err = io.Copy(buf, lr)
if err != nil {
return nil, []error{fmt.Errorf("%s could not be read", fcc.Path)}
}
if !bytes.Equal(buf.Bytes(), fcc.Content) {
return nil, []error{fmt.Errorf("%s contents are not set to %s", fcc.Path, fcc.Content)}
}
return nil, []error{}
}
// InPathCheck checks if the given executable is present in $PATH
type InPathCheck struct {
executable string
mandatory bool
}
// Check validates if the given executable is present in the path.
func (ipc InPathCheck) Check() (warnings, errors []error) {
_, err := exec.LookPath(ipc.executable)
if err != nil {
if ipc.mandatory {
// Return as an error:
return nil, []error{fmt.Errorf("%s not found in system path", ipc.executable)}
}
// Return as a warning:
return []error{fmt.Errorf("%s not found in system path", ipc.executable)}, nil
}
return nil, nil
}
// HostnameCheck checks if hostname match dns sub domain regex.
// If hostname doesn't match this regex, kubelet will not launch static pods like kube-apiserver/kube-controller-manager and so on.
type HostnameCheck struct {
nodeName string
}
// Check validates if hostname match dns sub domain regex.
func (hc HostnameCheck) Check() (warnings, errors []error) {
errors = []error{}
warnings = []error{}
for _, msg := range validation.ValidateNodeName(hc.nodeName, false) {
errors = append(errors, fmt.Errorf("hostname \"%s\" %s", hc.nodeName, msg))
}
addr, err := net.LookupHost(hc.nodeName)
if addr == nil {
warnings = append(warnings, fmt.Errorf("hostname \"%s\" could not be reached", hc.nodeName))
}
if err != nil {
warnings = append(warnings, fmt.Errorf("hostname \"%s\" %s", hc.nodeName, err))
}
return warnings, errors
}
// HTTPProxyCheck checks if https connection to specific host is going
// to be done directly or over proxy. If proxy detected, it will return warning.
type HTTPProxyCheck struct {
Proto string
Host string
Port int
}
// Check validates http connectivity type, direct or via proxy.
func (hst HTTPProxyCheck) Check() (warnings, errors []error) {
url := fmt.Sprintf("%s://%s:%d", hst.Proto, hst.Host, hst.Port)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, []error{err}
}
proxy, err := http.DefaultTransport.(*http.Transport).Proxy(req)
if err != nil {
return nil, []error{err}
}
if proxy != nil {
return []error{fmt.Errorf("Connection to %q uses proxy %q. If that is not intended, adjust your proxy settings", url, proxy)}, nil
}
return nil, nil
}
// HTTPProxyCIDRCheck checks if https connection to specific subnet is going
// to be done directly or over proxy. If proxy detected, it will return warning.
// Similar to HTTPProxyCheck above, but operates with subnets and uses API
// machinery transport defaults to simulate kube-apiserver accessing cluster
// services and pods.
type HTTPProxyCIDRCheck struct {
Proto string
CIDR string
}
// Check validates http connectivity to first IP address in the CIDR.
// If it is not directly connected and goes via proxy it will produce warning.
func (subnet HTTPProxyCIDRCheck) Check() (warnings, errors []error) {
if len(subnet.CIDR) == 0 {
return nil, nil
}
_, cidr, err := net.ParseCIDR(subnet.CIDR)
if err != nil {
return nil, []error{fmt.Errorf("error parsing CIDR %q: %v", subnet.CIDR, err)}
}
testIP, err := ipallocator.GetIndexedIP(cidr, 1)
if err != nil {
return nil, []error{fmt.Errorf("unable to get first IP address from the given CIDR (%s): %v", cidr.String(), err)}
}
testIPstring := testIP.String()
if len(testIP) == net.IPv6len {
testIPstring = fmt.Sprintf("[%s]:1234", testIP)
}
url := fmt.Sprintf("%s://%s/", subnet.Proto, testIPstring)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, []error{err}
}
// Utilize same transport defaults as it will be used by API server
proxy, err := netutil.SetOldTransportDefaults(&http.Transport{}).Proxy(req)
if err != nil {
return nil, []error{err}
}
if proxy != nil {
return []error{fmt.Errorf("connection to %q uses proxy %q. This may lead to malfunctional cluster setup. Make sure that Pod and Services IP ranges specified correctly as exceptions in proxy configuration", subnet.CIDR, proxy)}, nil
}
return nil, nil
}
// ExtraArgsCheck checks if arguments are valid.
type ExtraArgsCheck struct {
APIServerExtraArgs map[string]string
ControllerManagerExtraArgs map[string]string
SchedulerExtraArgs map[string]string
}
// Check validates additional arguments of the control plane components.
func (eac ExtraArgsCheck) Check() (warnings, errors []error) {
argsCheck := func(name string, args map[string]string, f *pflag.FlagSet) []error {
errs := []error{}
for k, v := range args {
if err := f.Set(k, v); err != nil {
errs = append(errs, fmt.Errorf("%s: failed to parse extra argument --%s=%s", name, k, v))
}
}
return errs
}
warnings = []error{}
if len(eac.APIServerExtraArgs) > 0 {
flags := pflag.NewFlagSet("", pflag.ContinueOnError)
s := apiservoptions.NewServerRunOptions()
s.AddFlags(flags)
warnings = append(warnings, argsCheck("kube-apiserver", eac.APIServerExtraArgs, flags)...)
}
if len(eac.ControllerManagerExtraArgs) > 0 {
flags := pflag.NewFlagSet("", pflag.ContinueOnError)
s := cmoptions.NewCMServer()
s.AddFlags(flags, []string{}, []string{})
warnings = append(warnings, argsCheck("kube-controller-manager", eac.ControllerManagerExtraArgs, flags)...)
}
if len(eac.SchedulerExtraArgs) > 0 {
flags := pflag.NewFlagSet("", pflag.ContinueOnError)
s := schoptions.NewSchedulerServer()
s.AddFlags(flags)
warnings = append(warnings, argsCheck("kube-scheduler", eac.SchedulerExtraArgs, flags)...)
}
return warnings, nil
}
// SystemVerificationCheck defines struct used for for running the system verification node check in test/e2e_node/system
type SystemVerificationCheck struct{}
// Check runs all individual checks
func (sysver SystemVerificationCheck) Check() (warnings, errors []error) {
// Create a buffered writer and choose a quite large value (1M) and suppose the output from the system verification test won't exceed the limit
// Run the system verification check, but write to out buffered writer instead of stdout
bufw := bufio.NewWriterSize(os.Stdout, 1*1024*1024)
reporter := &system.StreamReporter{WriteStream: bufw}
var errs []error
var warns []error
// All the validators we'd like to run:
var validators = []system.Validator{
&system.OSValidator{Reporter: reporter},
&system.KernelValidator{Reporter: reporter},
&system.CgroupsValidator{Reporter: reporter},
&system.DockerValidator{Reporter: reporter},
}
// Run all validators
for _, v := range validators {
warn, err := v.Validate(system.DefaultSysSpec)
if err != nil {
errs = append(errs, err)
}
if warn != nil {
warns = append(warns, warn)
}
}
if len(errs) != 0 {
// Only print the output from the system verification check if the check failed
fmt.Println("[preflight] The system verification failed. Printing the output from the verification:")
bufw.Flush()
return warns, errs
}
return warns, nil
}
// KubernetesVersionCheck validates kubernetes and kubeadm versions
type KubernetesVersionCheck struct {
KubeadmVersion string
KubernetesVersion string
}
// Check validates kubernetes and kubeadm versions
func (kubever KubernetesVersionCheck) Check() (warnings, errors []error) {
// Skip this check for "super-custom builds", where apimachinery/the overall codebase version is not set.
if strings.HasPrefix(kubever.KubeadmVersion, "v0.0.0") {
return nil, nil
}
kadmVersion, err := versionutil.ParseSemantic(kubever.KubeadmVersion)
if err != nil {
return nil, []error{fmt.Errorf("couldn't parse kubeadm version %q: %v", kubever.KubeadmVersion, err)}
}
k8sVersion, err := versionutil.ParseSemantic(kubever.KubernetesVersion)
if err != nil {
return nil, []error{fmt.Errorf("couldn't parse kubernetes version %q: %v", kubever.KubernetesVersion, err)}
}
// Checks if k8sVersion greater or equal than the first unsupported versions by current version of kubeadm,
// that is major.minor+1 (all patch and pre-releases versions included)
// NB. in semver patches number is a numeric, while prerelease is a string where numeric identifiers always have lower precedence than non-numeric identifiers.
// thus setting the value to x.y.0-0 we are defining the very first patch - prereleases within x.y minor release.
firstUnsupportedVersion := versionutil.MustParseSemantic(fmt.Sprintf("%d.%d.%s", kadmVersion.Major(), kadmVersion.Minor()+1, "0-0"))
if k8sVersion.AtLeast(firstUnsupportedVersion) {
return []error{fmt.Errorf("kubernetes version is greater than kubeadm version. Please consider to upgrade kubeadm. kubernetes version: %s. Kubeadm version: %d.%d.x", k8sVersion, kadmVersion.Components()[0], kadmVersion.Components()[1])}, nil
}
return nil, nil
}
// KubeletVersionCheck validates installed kubelet version
type KubeletVersionCheck struct{}
// Check validates kubelet version. It should be not less than minimal supported version
func (kubever KubeletVersionCheck) Check() (warnings, errors []error) {
kubeletVersion, err := GetKubeletVersion()
if err != nil {
return nil, []error{fmt.Errorf("couldn't get kubelet version: %v", err)}
}
if kubeletVersion.LessThan(kubeadmconstants.MinimumKubeletVersion) {
return nil, []error{fmt.Errorf("Kubelet version %q is lower than kubadm can support. Please upgrade kubelet", kubeletVersion)}
}
return nil, []error{}
}
// SwapCheck warns if swap is enabled
type SwapCheck struct{}
// Check validates whether swap is enabled or not
func (swc SwapCheck) Check() (warnings, errors []error) {
f, err := os.Open("/proc/swaps")
if err != nil {
// /proc/swaps not available, thus no reasons to warn
return nil, nil
}
defer f.Close()
var buf []string
scanner := bufio.NewScanner(f)
for scanner.Scan() {
buf = append(buf, scanner.Text())
}
if err := scanner.Err(); err != nil {
return nil, []error{fmt.Errorf("error parsing /proc/swaps: %v", err)}
}
if len(buf) > 1 {
return []error{fmt.Errorf("running with swap on is not supported. Please disable swap or set kubelet's --fail-swap-on flag to false")}, nil
}
return nil, nil
}
type etcdVersionResponse struct {
Etcdserver string `json:"etcdserver"`
Etcdcluster string `json:"etcdcluster"`
}
// ExternalEtcdVersionCheck checks if version of external etcd meets the demand of kubeadm
type ExternalEtcdVersionCheck struct {
Etcd kubeadmapi.Etcd
}
// Check validates external etcd version
func (evc ExternalEtcdVersionCheck) Check() (warnings, errors []error) {
var config *tls.Config
var err error
if config, err = evc.configRootCAs(config); err != nil {
errors = append(errors, err)
return nil, errors
}
if config, err = evc.configCertAndKey(config); err != nil {
errors = append(errors, err)
return nil, errors
}
client := evc.getHTTPClient(config)
for _, endpoint := range evc.Etcd.Endpoints {
if _, err := url.Parse(endpoint); err != nil {
errors = append(errors, fmt.Errorf("failed to parse external etcd endpoint %s : %v", endpoint, err))
continue
}
resp := etcdVersionResponse{}
var err error
versionURL := fmt.Sprintf("%s/%s", endpoint, "version")
if tmpVersionURL, err := purell.NormalizeURLString(versionURL, purell.FlagRemoveDuplicateSlashes); err != nil {
errors = append(errors, fmt.Errorf("failed to normalize external etcd version url %s : %v", versionURL, err))
continue
} else {
versionURL = tmpVersionURL
}
if err = getEtcdVersionResponse(client, versionURL, &resp); err != nil {
errors = append(errors, err)
continue
}
etcdVersion, err := semver.Parse(resp.Etcdserver)
if err != nil {
errors = append(errors, fmt.Errorf("couldn't parse external etcd version %q: %v", resp.Etcdserver, err))
continue
}
if etcdVersion.LT(minExternalEtcdVersion) {
errors = append(errors, fmt.Errorf("this version of kubeadm only supports external etcd version >= %s. Current version: %s", kubeadmconstants.MinExternalEtcdVersion, resp.Etcdserver))
continue
}
}
return nil, errors
}
// configRootCAs configures and returns a reference to tls.Config instance if CAFile is provided
func (evc ExternalEtcdVersionCheck) configRootCAs(config *tls.Config) (*tls.Config, error) {
var CACertPool *x509.CertPool
if evc.Etcd.CAFile != "" {
CACert, err := ioutil.ReadFile(evc.Etcd.CAFile)
if err != nil {
return nil, fmt.Errorf("couldn't load external etcd's server certificate %s: %v", evc.Etcd.CAFile, err)
}
CACertPool = x509.NewCertPool()
CACertPool.AppendCertsFromPEM(CACert)
}
if CACertPool != nil {
if config == nil {
config = &tls.Config{}
}
config.RootCAs = CACertPool
}
return config, nil
}
// configCertAndKey configures and returns a reference to tls.Config instance if CertFile and KeyFile pair is provided
func (evc ExternalEtcdVersionCheck) configCertAndKey(config *tls.Config) (*tls.Config, error) {
var cert tls.Certificate
if evc.Etcd.CertFile != "" && evc.Etcd.KeyFile != "" {
var err error
cert, err = tls.LoadX509KeyPair(evc.Etcd.CertFile, evc.Etcd.KeyFile)
if err != nil {
return nil, fmt.Errorf("couldn't load external etcd's certificate and key pair %s, %s: %v", evc.Etcd.CertFile, evc.Etcd.KeyFile, err)
}
if config == nil {
config = &tls.Config{}
}
config.Certificates = []tls.Certificate{cert}
}
return config, nil
}
func (evc ExternalEtcdVersionCheck) getHTTPClient(config *tls.Config) *http.Client {
if config != nil {
transport := &http.Transport{
TLSClientConfig: config,
}
return &http.Client{
Transport: transport,
Timeout: externalEtcdRequestTimeout,
}
}
return &http.Client{Timeout: externalEtcdRequestTimeout}
}
func getEtcdVersionResponse(client *http.Client, url string, target interface{}) error {
loopCount := externalEtcdRequestRetries + 1
var err error
var stopRetry bool
for loopCount > 0 {
if loopCount <= externalEtcdRequestRetries {
time.Sleep(externalEtcdRequestInterval)
}
stopRetry, err = func() (stopRetry bool, err error) {
r, err := client.Get(url)
if err != nil {
loopCount--
return false, nil
}
defer r.Body.Close()
if r != nil && r.StatusCode >= 500 && r.StatusCode <= 599 {
loopCount--
return false, nil
}
return true, json.NewDecoder(r.Body).Decode(target)
}()
if stopRetry {
break
}
}
return err
}
// RunInitMasterChecks executes all individual, applicable to Master node checks.
func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error {
// First, check if we're root separately from the other preflight checks and fail fast
if err := RunRootCheckOnly(); err != nil {
return err
}
checks := []Checker{
KubernetesVersionCheck{KubernetesVersion: cfg.KubernetesVersion, KubeadmVersion: kubeadmversion.Get().GitVersion},
SystemVerificationCheck{},
IsRootCheck{},
HostnameCheck{nodeName: cfg.NodeName},
KubeletVersionCheck{},
ServiceCheck{Service: "kubelet", CheckIfActive: false},
ServiceCheck{Service: "docker", CheckIfActive: true},
FirewalldCheck{ports: []int{int(cfg.API.BindPort), 10250}},
PortOpenCheck{port: int(cfg.API.BindPort)},
PortOpenCheck{port: 10250},
PortOpenCheck{port: 10251},
PortOpenCheck{port: 10252},
DirAvailableCheck{Path: filepath.Join(kubeadmconstants.KubernetesDir, kubeadmconstants.ManifestsSubDirName)},
FileContentCheck{Path: bridgenf, Content: []byte{'1'}},
SwapCheck{},
InPathCheck{executable: "ip", mandatory: true},
InPathCheck{executable: "iptables", mandatory: true},
InPathCheck{executable: "mount", mandatory: true},
InPathCheck{executable: "nsenter", mandatory: true},
InPathCheck{executable: "ebtables", mandatory: false},
InPathCheck{executable: "ethtool", mandatory: false},
InPathCheck{executable: "socat", mandatory: false},
InPathCheck{executable: "tc", mandatory: false},
InPathCheck{executable: "touch", mandatory: false},
ExtraArgsCheck{
APIServerExtraArgs: cfg.APIServerExtraArgs,
ControllerManagerExtraArgs: cfg.ControllerManagerExtraArgs,
SchedulerExtraArgs: cfg.SchedulerExtraArgs,
},
HTTPProxyCheck{Proto: "https", Host: cfg.API.AdvertiseAddress, Port: int(cfg.API.BindPort)},
HTTPProxyCIDRCheck{Proto: "https", CIDR: cfg.Networking.ServiceSubnet},
HTTPProxyCIDRCheck{Proto: "https", CIDR: cfg.Networking.PodSubnet},
}
if len(cfg.Etcd.Endpoints) == 0 {
// Only do etcd related checks when no external endpoints were specified
checks = append(checks,
PortOpenCheck{port: 2379},
DirAvailableCheck{Path: cfg.Etcd.DataDir},
)
} else {
// Only check etcd version when external endpoints are specified
if cfg.Etcd.CAFile != "" {
checks = append(checks, FileExistingCheck{Path: cfg.Etcd.CAFile})
}
if cfg.Etcd.CertFile != "" {
checks = append(checks, FileExistingCheck{Path: cfg.Etcd.CertFile})
}
if cfg.Etcd.KeyFile != "" {
checks = append(checks, FileExistingCheck{Path: cfg.Etcd.KeyFile})
}
checks = append(checks,
ExternalEtcdVersionCheck{Etcd: cfg.Etcd},
)
}
// Check the config for authorization mode
for _, authzMode := range cfg.AuthorizationModes {
switch authzMode {
case authzmodes.ModeABAC:
checks = append(checks, FileExistingCheck{Path: kubeadmconstants.AuthorizationPolicyPath})
case authzmodes.ModeWebhook:
checks = append(checks, FileExistingCheck{Path: kubeadmconstants.AuthorizationWebhookConfigPath})
}
}
if ip := net.ParseIP(cfg.API.AdvertiseAddress); ip != nil {
if ip.To4() == nil && ip.To16() != nil {
checks = append(checks,
FileContentCheck{Path: bridgenf6, Content: []byte{'1'}},
)
}
}
return RunChecks(checks, os.Stderr)
}
// RunJoinNodeChecks executes all individual, applicable to node checks.
func RunJoinNodeChecks(cfg *kubeadmapi.NodeConfiguration) error {
// First, check if we're root separately from the other preflight checks and fail fast
if err := RunRootCheckOnly(); err != nil {
return err
}
checks := []Checker{
SystemVerificationCheck{},
IsRootCheck{},
HostnameCheck{cfg.NodeName},
KubeletVersionCheck{},
ServiceCheck{Service: "kubelet", CheckIfActive: false},
ServiceCheck{Service: "docker", CheckIfActive: true},
PortOpenCheck{port: 10250},
DirAvailableCheck{Path: filepath.Join(kubeadmconstants.KubernetesDir, kubeadmconstants.ManifestsSubDirName)},
FileAvailableCheck{Path: cfg.CACertPath},
FileAvailableCheck{Path: filepath.Join(kubeadmconstants.KubernetesDir, kubeadmconstants.KubeletKubeConfigFileName)},
FileContentCheck{Path: bridgenf, Content: []byte{'1'}},
SwapCheck{},
InPathCheck{executable: "ip", mandatory: true},
InPathCheck{executable: "iptables", mandatory: true},
InPathCheck{executable: "mount", mandatory: true},
InPathCheck{executable: "nsenter", mandatory: true},
InPathCheck{executable: "ebtables", mandatory: false},
InPathCheck{executable: "ethtool", mandatory: false},
InPathCheck{executable: "socat", mandatory: false},
InPathCheck{executable: "tc", mandatory: false},
InPathCheck{executable: "touch", mandatory: false},
}
if len(cfg.DiscoveryTokenAPIServers) > 0 {
if ip := net.ParseIP(cfg.DiscoveryTokenAPIServers[0]); ip != nil {
if ip.To4() == nil && ip.To16() != nil {
checks = append(checks,
FileContentCheck{Path: bridgenf6, Content: []byte{'1'}},
)
}
}
}
return RunChecks(checks, os.Stderr)
}
// RunRootCheckOnly initializes cheks slice of structs and call RunChecks
func RunRootCheckOnly() error {
checks := []Checker{
IsRootCheck{},
}
return RunChecks(checks, os.Stderr)
}
// RunChecks runs each check, displays it's warnings/errors, and once all
// are processed will exit if any errors occurred.
func RunChecks(checks []Checker, ww io.Writer) error {
found := []error{}
for _, c := range checks {
warnings, errs := c.Check()
for _, w := range warnings {
io.WriteString(ww, fmt.Sprintf("[preflight] WARNING: %v\n", w))
}
found = append(found, errs...)
}
if len(found) > 0 {
var errs bytes.Buffer
for _, i := range found {
errs.WriteString("\t" + i.Error() + "\n")
}
return &Error{Msg: errs.String()}
}
return nil
}
// TryStartKubelet attempts to bring up kubelet service
func TryStartKubelet() {
// If we notice that the kubelet service is inactive, try to start it
initSystem, err := initsystem.GetInitSystem()
if err != nil {
fmt.Println("[preflight] No supported init system detected, won't ensure kubelet is running.")
} else if initSystem.ServiceExists("kubelet") && !initSystem.ServiceIsActive("kubelet") {
fmt.Println("[preflight] Starting the kubelet service")
if err := initSystem.ServiceStart("kubelet"); err != nil {
fmt.Printf("[preflight] WARNING: Unable to start the kubelet service: [%v]\n", err)
fmt.Println("[preflight] WARNING: Please ensure kubelet is running manually.")
}
}
}