forked from moby/moby
-
Notifications
You must be signed in to change notification settings - Fork 0
/
daemon.go
1603 lines (1381 loc) · 47.8 KB
/
daemon.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
// Package daemon exposes the functions that occur on the host server
// that the Docker daemon is running.
//
// In implementing the various functions of the daemon, there is often
// a method-specific struct for configuring the runtime behavior.
package daemon
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"path"
"path/filepath"
"runtime"
"sync"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution/digest"
"github.com/docker/docker/api"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/events"
"github.com/docker/docker/daemon/exec"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/execdriver/execdrivers"
"github.com/docker/engine-api/types"
containertypes "github.com/docker/engine-api/types/container"
eventtypes "github.com/docker/engine-api/types/events"
"github.com/docker/engine-api/types/filters"
registrytypes "github.com/docker/engine-api/types/registry"
"github.com/docker/engine-api/types/strslice"
// register graph drivers
_ "github.com/docker/docker/daemon/graphdriver/register"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/distribution"
dmetadata "github.com/docker/docker/distribution/metadata"
"github.com/docker/docker/distribution/xfer"
derr "github.com/docker/docker/errors"
"github.com/docker/docker/image"
"github.com/docker/docker/image/tarexport"
"github.com/docker/docker/layer"
"github.com/docker/docker/migrate/v1"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/fileutils"
"github.com/docker/docker/pkg/graphdb"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/mount"
"github.com/docker/docker/pkg/namesgenerator"
"github.com/docker/docker/pkg/progress"
"github.com/docker/docker/pkg/registrar"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/streamformatter"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/sysinfo"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/pkg/truncindex"
"github.com/docker/docker/reference"
"github.com/docker/docker/registry"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
volumedrivers "github.com/docker/docker/volume/drivers"
"github.com/docker/docker/volume/local"
"github.com/docker/docker/volume/store"
"github.com/docker/go-connections/nat"
"github.com/docker/libnetwork"
lntypes "github.com/docker/libnetwork/types"
"github.com/docker/libtrust"
"github.com/opencontainers/runc/libcontainer"
"golang.org/x/net/context"
)
const (
// maxDownloadConcurrency is the maximum number of downloads that
// may take place at a time for each pull.
maxDownloadConcurrency = 3
// maxUploadConcurrency is the maximum number of uploads that
// may take place at a time for each push.
maxUploadConcurrency = 5
)
var (
validContainerNameChars = utils.RestrictedNameChars
validContainerNamePattern = utils.RestrictedNamePattern
errSystemNotSupported = errors.New("The Docker daemon is not supported on this platform.")
)
// ErrImageDoesNotExist is error returned when no image can be found for a reference.
type ErrImageDoesNotExist struct {
RefOrID string
}
func (e ErrImageDoesNotExist) Error() string {
return fmt.Sprintf("no such id: %s", e.RefOrID)
}
type contStore struct {
s map[string]*container.Container
sync.Mutex
}
func (c *contStore) Add(id string, cont *container.Container) {
c.Lock()
c.s[id] = cont
c.Unlock()
}
func (c *contStore) Get(id string) *container.Container {
c.Lock()
res := c.s[id]
c.Unlock()
return res
}
func (c *contStore) Delete(id string) {
c.Lock()
delete(c.s, id)
c.Unlock()
}
func (c *contStore) List() []*container.Container {
containers := new(History)
c.Lock()
for _, cont := range c.s {
containers.Add(cont)
}
c.Unlock()
containers.sort()
return *containers
}
// Daemon holds information about the Docker daemon.
type Daemon struct {
ID string
repository string
containers *contStore
execCommands *exec.Store
referenceStore reference.Store
downloadManager *xfer.LayerDownloadManager
uploadManager *xfer.LayerUploadManager
distributionMetadataStore dmetadata.Store
trustKey libtrust.PrivateKey
idIndex *truncindex.TruncIndex
configStore *Config
execDriver execdriver.Driver
statsCollector *statsCollector
defaultLogConfig containertypes.LogConfig
RegistryService *registry.Service
EventsService *events.Events
netController libnetwork.NetworkController
volumes *store.VolumeStore
discoveryWatcher discoveryReloader
root string
seccompEnabled bool
shutdown bool
uidMaps []idtools.IDMap
gidMaps []idtools.IDMap
layerStore layer.Store
imageStore image.Store
nameIndex *registrar.Registrar
linkIndex *linkIndex
}
// GetContainer looks for a container using the provided information, which could be
// one of the following inputs from the caller:
// - A full container ID, which will exact match a container in daemon's list
// - A container name, which will only exact match via the GetByName() function
// - A partial container ID prefix (e.g. short ID) of any length that is
// unique enough to only return a single container object
// If none of these searches succeed, an error is returned
func (daemon *Daemon) GetContainer(prefixOrName string) (*container.Container, error) {
if containerByID := daemon.containers.Get(prefixOrName); containerByID != nil {
// prefix is an exact match to a full container ID
return containerByID, nil
}
// GetByName will match only an exact name provided; we ignore errors
if containerByName, _ := daemon.GetByName(prefixOrName); containerByName != nil {
// prefix is an exact match to a full container Name
return containerByName, nil
}
containerID, indexError := daemon.idIndex.Get(prefixOrName)
if indexError != nil {
// When truncindex defines an error type, use that instead
if indexError == truncindex.ErrNotExist {
return nil, derr.ErrorCodeNoSuchContainer.WithArgs(prefixOrName)
}
return nil, indexError
}
return daemon.containers.Get(containerID), nil
}
// Exists returns a true if a container of the specified ID or name exists,
// false otherwise.
func (daemon *Daemon) Exists(id string) bool {
c, _ := daemon.GetContainer(id)
return c != nil
}
// IsPaused returns a bool indicating if the specified container is paused.
func (daemon *Daemon) IsPaused(id string) bool {
c, _ := daemon.GetContainer(id)
return c.State.IsPaused()
}
func (daemon *Daemon) containerRoot(id string) string {
return filepath.Join(daemon.repository, id)
}
// Load reads the contents of a container from disk
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*container.Container, error) {
container := daemon.newBaseContainer(id)
if err := container.FromDisk(); err != nil {
return nil, err
}
if container.ID != id {
return container, fmt.Errorf("Container %s is stored at %s", container.ID, id)
}
return container, nil
}
func (daemon *Daemon) registerName(container *container.Container) error {
if daemon.Exists(container.ID) {
return fmt.Errorf("Container is already loaded")
}
if err := validateID(container.ID); err != nil {
return err
}
if container.Name == "" {
name, err := daemon.generateNewName(container.ID)
if err != nil {
return err
}
container.Name = name
if err := container.ToDiskLocking(); err != nil {
logrus.Errorf("Error saving container name to disk: %v", err)
}
}
return daemon.nameIndex.Reserve(container.Name, container.ID)
}
// Register makes a container object usable by the daemon as <container.ID>
func (daemon *Daemon) Register(container *container.Container) error {
// Attach to stdout and stderr
if container.Config.OpenStdin {
container.NewInputPipes()
} else {
container.NewNopInputPipe()
}
daemon.containers.Add(container.ID, container)
daemon.idIndex.Add(container.ID)
if container.IsRunning() {
logrus.Debugf("killing old running container %s", container.ID)
// Set exit code to 128 + SIGKILL (9) to properly represent unsuccessful exit
container.SetStoppedLocking(&execdriver.ExitStatus{ExitCode: 137})
// use the current driver and ensure that the container is dead x.x
cmd := &execdriver.Command{
CommonCommand: execdriver.CommonCommand{
ID: container.ID,
},
}
daemon.execDriver.Terminate(cmd)
container.UnmountIpcMounts(mount.Unmount)
daemon.Unmount(container)
if err := container.ToDiskLocking(); err != nil {
logrus.Errorf("Error saving stopped state to disk: %v", err)
}
}
if err := daemon.prepareMountPoints(container); err != nil {
return err
}
return nil
}
func (daemon *Daemon) restore() error {
var (
debug = utils.IsDebugEnabled()
currentDriver = daemon.GraphDriverName()
containers = make(map[string]*container.Container)
)
if !debug {
logrus.Info("Loading containers: start.")
}
dir, err := ioutil.ReadDir(daemon.repository)
if err != nil {
return err
}
for _, v := range dir {
id := v.Name()
container, err := daemon.load(id)
if !debug && logrus.GetLevel() == logrus.InfoLevel {
fmt.Print(".")
}
if err != nil {
logrus.Errorf("Failed to load container %v: %v", id, err)
continue
}
rwlayer, err := daemon.layerStore.GetRWLayer(container.ID)
if err != nil {
logrus.Errorf("Failed to load container mount %v: %v", id, err)
continue
}
container.RWLayer = rwlayer
// Ignore the container if it does not support the current driver being used by the graph
if (container.Driver == "" && currentDriver == "aufs") || container.Driver == currentDriver {
logrus.Debugf("Loaded container %v", container.ID)
containers[container.ID] = container
} else {
logrus.Debugf("Cannot load container %s because it was created with another graph driver.", container.ID)
}
}
var migrateLegacyLinks bool
restartContainers := make(map[*container.Container]chan struct{})
for _, c := range containers {
if err := daemon.registerName(c); err != nil {
logrus.Errorf("Failed to register container %s: %s", c.ID, err)
continue
}
if err := daemon.Register(c); err != nil {
logrus.Errorf("Failed to register container %s: %s", c.ID, err)
continue
}
// get list of containers we need to restart
if daemon.configStore.AutoRestart && c.ShouldRestart() {
restartContainers[c] = make(chan struct{})
}
// if c.hostConfig.Links is nil (not just empty), then it is using the old sqlite links and needs to be migrated
if c.HostConfig != nil && c.HostConfig.Links == nil {
migrateLegacyLinks = true
}
}
// migrate any legacy links from sqlite
linkdbFile := filepath.Join(daemon.root, "linkgraph.db")
var legacyLinkDB *graphdb.Database
if migrateLegacyLinks {
legacyLinkDB, err = graphdb.NewSqliteConn(linkdbFile)
if err != nil {
return fmt.Errorf("error connecting to legacy link graph DB %s, container links may be lost: %v", linkdbFile, err)
}
defer legacyLinkDB.Close()
}
// Now that all the containers are registered, register the links
for _, c := range containers {
if migrateLegacyLinks {
if err := daemon.migrateLegacySqliteLinks(legacyLinkDB, c); err != nil {
return err
}
}
if err := daemon.registerLinks(c, c.HostConfig); err != nil {
logrus.Errorf("failed to register link for container %s: %v", c.ID, err)
}
}
group := sync.WaitGroup{}
for c, notifier := range restartContainers {
group.Add(1)
go func(c *container.Container, chNotify chan struct{}) {
defer group.Done()
logrus.Debugf("Starting container %s", c.ID)
// ignore errors here as this is a best effort to wait for children to be
// running before we try to start the container
children := daemon.children(c)
timeout := time.After(5 * time.Second)
for _, child := range children {
if notifier, exists := restartContainers[child]; exists {
select {
case <-notifier:
case <-timeout:
}
}
}
if err := daemon.containerStart(c); err != nil {
logrus.Errorf("Failed to start container %s: %s", c.ID, err)
}
close(chNotify)
}(c, notifier)
}
group.Wait()
if !debug {
if logrus.GetLevel() == logrus.InfoLevel {
fmt.Println()
}
logrus.Info("Loading containers: done.")
}
return nil
}
func (daemon *Daemon) mergeAndVerifyConfig(config *containertypes.Config, img *image.Image) error {
if img != nil && img.Config != nil {
if err := merge(config, img.Config); err != nil {
return err
}
}
if config.Entrypoint.Len() == 0 && config.Cmd.Len() == 0 {
return fmt.Errorf("No command specified")
}
return nil
}
func (daemon *Daemon) generateIDAndName(name string) (string, string, error) {
var (
err error
id = stringid.GenerateNonCryptoID()
)
if name == "" {
if name, err = daemon.generateNewName(id); err != nil {
return "", "", err
}
return id, name, nil
}
if name, err = daemon.reserveName(id, name); err != nil {
return "", "", err
}
return id, name, nil
}
func (daemon *Daemon) reserveName(id, name string) (string, error) {
if !validContainerNamePattern.MatchString(name) {
return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
}
if name[0] != '/' {
name = "/" + name
}
if err := daemon.nameIndex.Reserve(name, id); err != nil {
if err == registrar.ErrNameReserved {
id, err := daemon.nameIndex.Get(name)
if err != nil {
logrus.Errorf("got unexpected error while looking up reserved name: %v", err)
return "", err
}
return "", fmt.Errorf("Conflict. The name %q is already in use by container %s. You have to remove (or rename) that container to be able to reuse that name.", name, id)
}
return "", fmt.Errorf("error reserving name: %s, error: %v", name, err)
}
return name, nil
}
func (daemon *Daemon) releaseName(name string) {
daemon.nameIndex.Release(name)
}
func (daemon *Daemon) generateNewName(id string) (string, error) {
var name string
for i := 0; i < 6; i++ {
name = namesgenerator.GetRandomName(i)
if name[0] != '/' {
name = "/" + name
}
if err := daemon.nameIndex.Reserve(name, id); err != nil {
if err == registrar.ErrNameReserved {
continue
}
return "", err
}
return name, nil
}
name = "/" + stringid.TruncateID(id)
if err := daemon.nameIndex.Reserve(name, id); err != nil {
return "", err
}
return name, nil
}
func (daemon *Daemon) generateHostname(id string, config *containertypes.Config) {
// Generate default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
}
func (daemon *Daemon) getEntrypointAndArgs(configEntrypoint *strslice.StrSlice, configCmd *strslice.StrSlice) (string, []string) {
cmdSlice := configCmd.Slice()
if configEntrypoint.Len() != 0 {
eSlice := configEntrypoint.Slice()
return eSlice[0], append(eSlice[1:], cmdSlice...)
}
return cmdSlice[0], cmdSlice[1:]
}
func (daemon *Daemon) newContainer(name string, config *containertypes.Config, imgID image.ID) (*container.Container, error) {
var (
id string
err error
noExplicitName = name == ""
)
id, name, err = daemon.generateIDAndName(name)
if err != nil {
return nil, err
}
daemon.generateHostname(id, config)
entrypoint, args := daemon.getEntrypointAndArgs(config.Entrypoint, config.Cmd)
base := daemon.newBaseContainer(id)
base.Created = time.Now().UTC()
base.Path = entrypoint
base.Args = args //FIXME: de-duplicate from config
base.Config = config
base.HostConfig = &containertypes.HostConfig{}
base.ImageID = imgID
base.NetworkSettings = &network.Settings{IsAnonymousEndpoint: noExplicitName}
base.Name = name
base.Driver = daemon.GraphDriverName()
return base, err
}
// GetByName returns a container given a name.
func (daemon *Daemon) GetByName(name string) (*container.Container, error) {
fullName := name
if name[0] != '/' {
fullName = "/" + name
}
id, err := daemon.nameIndex.Get(fullName)
if err != nil {
return nil, fmt.Errorf("Could not find entity for %s", name)
}
e := daemon.containers.Get(id)
if e == nil {
return nil, fmt.Errorf("Could not find container for entity id %s", id)
}
return e, nil
}
// SubscribeToEvents returns the currently record of events, a channel to stream new events from, and a function to cancel the stream of events.
func (daemon *Daemon) SubscribeToEvents(since, sinceNano int64, filter filters.Args) ([]eventtypes.Message, chan interface{}) {
ef := events.NewFilter(filter)
return daemon.EventsService.SubscribeTopic(since, sinceNano, ef)
}
// UnsubscribeFromEvents stops the event subscription for a client by closing the
// channel where the daemon sends events to.
func (daemon *Daemon) UnsubscribeFromEvents(listener chan interface{}) {
daemon.EventsService.Evict(listener)
}
// GetLabels for a container or image id
func (daemon *Daemon) GetLabels(id string) map[string]string {
// TODO: TestCase
container := daemon.containers.Get(id)
if container != nil {
return container.Config.Labels
}
img, err := daemon.GetImage(id)
if err == nil {
return img.ContainerConfig.Labels
}
return nil
}
func (daemon *Daemon) children(c *container.Container) map[string]*container.Container {
return daemon.linkIndex.children(c)
}
// parents returns the names of the parent containers of the container
// with the given name.
func (daemon *Daemon) parents(c *container.Container) map[string]*container.Container {
return daemon.linkIndex.parents(c)
}
func (daemon *Daemon) registerLink(parent, child *container.Container, alias string) error {
fullName := path.Join(parent.Name, alias)
if err := daemon.nameIndex.Reserve(fullName, child.ID); err != nil {
return err
}
daemon.linkIndex.link(parent, child, fullName)
return nil
}
// NewDaemon sets up everything for the daemon to be able to service
// requests from the webserver.
func NewDaemon(config *Config, registryService *registry.Service) (daemon *Daemon, err error) {
setDefaultMtu(config)
// Ensure we have compatible configuration options
if err := checkConfigOptions(config); err != nil {
return nil, err
}
// Do we have a disabled network?
config.DisableBridge = isBridgeNetworkDisabled(config)
// Verify the platform is supported as a daemon
if !platformSupported {
return nil, errSystemNotSupported
}
// Validate platform-specific requirements
if err := checkSystem(); err != nil {
return nil, err
}
// set up SIGUSR1 handler on Unix-like systems, or a Win32 global event
// on Windows to dump Go routine stacks
setupDumpStackTrap()
uidMaps, gidMaps, err := setupRemappedRoot(config)
if err != nil {
return nil, err
}
rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
if err != nil {
return nil, err
}
// get the canonical path to the Docker root directory
var realRoot string
if _, err := os.Stat(config.Root); err != nil && os.IsNotExist(err) {
realRoot = config.Root
} else {
realRoot, err = fileutils.ReadSymlinkedDirectory(config.Root)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to root (%s): %s", config.Root, err)
}
}
if err = setupDaemonRoot(config, realRoot, rootUID, rootGID); err != nil {
return nil, err
}
// set up the tmpDir to use a canonical path
tmp, err := tempDir(config.Root, rootUID, rootGID)
if err != nil {
return nil, fmt.Errorf("Unable to get the TempDir under %s: %s", config.Root, err)
}
realTmp, err := fileutils.ReadSymlinkedDirectory(tmp)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to the TempDir (%s): %s", tmp, err)
}
os.Setenv("TMPDIR", realTmp)
d := &Daemon{}
// Ensure the daemon is properly shutdown if there is a failure during
// initialization
defer func() {
if err != nil {
if err := d.Shutdown(); err != nil {
logrus.Error(err)
}
}
}()
// Verify logging driver type
if config.LogConfig.Type != "none" {
if _, err := logger.GetLogDriver(config.LogConfig.Type); err != nil {
return nil, fmt.Errorf("error finding the logging driver: %v", err)
}
}
logrus.Debugf("Using default logging driver %s", config.LogConfig.Type)
daemonRepo := filepath.Join(config.Root, "containers")
if err := idtools.MkdirAllAs(daemonRepo, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}
driverName := os.Getenv("DOCKER_DRIVER")
if driverName == "" {
driverName = config.GraphDriver
}
d.layerStore, err = layer.NewStoreFromOptions(layer.StoreOptions{
StorePath: config.Root,
MetadataStorePathTemplate: filepath.Join(config.Root, "image", "%s", "layerdb"),
GraphDriver: driverName,
GraphDriverOptions: config.GraphOptions,
UIDMaps: uidMaps,
GIDMaps: gidMaps,
})
if err != nil {
return nil, err
}
graphDriver := d.layerStore.DriverName()
imageRoot := filepath.Join(config.Root, "image", graphDriver)
// Configure and validate the kernels security support
if err := configureKernelSecuritySupport(config, graphDriver); err != nil {
return nil, err
}
d.downloadManager = xfer.NewLayerDownloadManager(d.layerStore, maxDownloadConcurrency)
d.uploadManager = xfer.NewLayerUploadManager(maxUploadConcurrency)
ifs, err := image.NewFSStoreBackend(filepath.Join(imageRoot, "imagedb"))
if err != nil {
return nil, err
}
d.imageStore, err = image.NewImageStore(ifs, d.layerStore)
if err != nil {
return nil, err
}
// Configure the volumes driver
volStore, err := configureVolumes(config, rootUID, rootGID)
if err != nil {
return nil, err
}
trustKey, err := api.LoadOrCreateTrustKey(config.TrustKeyPath)
if err != nil {
return nil, err
}
trustDir := filepath.Join(config.Root, "trust")
if err := system.MkdirAll(trustDir, 0700); err != nil {
return nil, err
}
distributionMetadataStore, err := dmetadata.NewFSMetadataStore(filepath.Join(imageRoot, "distribution"))
if err != nil {
return nil, err
}
eventsService := events.New()
referenceStore, err := reference.NewReferenceStore(filepath.Join(imageRoot, "repositories.json"))
if err != nil {
return nil, fmt.Errorf("Couldn't create Tag store repositories: %s", err)
}
if err := restoreCustomImage(d.imageStore, d.layerStore, referenceStore); err != nil {
return nil, fmt.Errorf("Couldn't restore custom images: %s", err)
}
migrationStart := time.Now()
if err := v1.Migrate(config.Root, graphDriver, d.layerStore, d.imageStore, referenceStore, distributionMetadataStore); err != nil {
return nil, err
}
logrus.Infof("Graph migration to content-addressability took %.2f seconds", time.Since(migrationStart).Seconds())
// Discovery is only enabled when the daemon is launched with an address to advertise. When
// initialized, the daemon is registered and we can store the discovery backend as its read-only
if err := d.initDiscovery(config); err != nil {
return nil, err
}
d.netController, err = d.initNetworkController(config)
if err != nil {
return nil, fmt.Errorf("Error initializing network controller: %v", err)
}
sysInfo := sysinfo.New(false)
// Check if Devices cgroup is mounted, it is hard requirement for container security,
// on Linux/FreeBSD.
if runtime.GOOS != "windows" && !sysInfo.CgroupDevicesEnabled {
return nil, fmt.Errorf("Devices cgroup isn't mounted")
}
ed, err := execdrivers.NewDriver(config.ExecOptions, config.ExecRoot, config.Root, sysInfo)
if err != nil {
return nil, err
}
d.ID = trustKey.PublicKey().KeyID()
d.repository = daemonRepo
d.containers = &contStore{s: make(map[string]*container.Container)}
d.execCommands = exec.NewStore()
d.referenceStore = referenceStore
d.distributionMetadataStore = distributionMetadataStore
d.trustKey = trustKey
d.idIndex = truncindex.NewTruncIndex([]string{})
d.configStore = config
d.execDriver = ed
d.statsCollector = d.newStatsCollector(1 * time.Second)
d.defaultLogConfig = containertypes.LogConfig{
Type: config.LogConfig.Type,
Config: config.LogConfig.Config,
}
d.RegistryService = registryService
d.EventsService = eventsService
d.volumes = volStore
d.root = config.Root
d.uidMaps = uidMaps
d.gidMaps = gidMaps
d.seccompEnabled = sysInfo.Seccomp
d.nameIndex = registrar.NewRegistrar()
d.linkIndex = newLinkIndex()
if err := d.cleanupMounts(); err != nil {
return nil, err
}
go d.execCommandGC()
if err := d.restore(); err != nil {
return nil, err
}
return d, nil
}
func (daemon *Daemon) shutdownContainer(c *container.Container) error {
// TODO(windows): Handle docker restart with paused containers
if c.IsPaused() {
// To terminate a process in freezer cgroup, we should send
// SIGTERM to this process then unfreeze it, and the process will
// force to terminate immediately.
logrus.Debugf("Found container %s is paused, sending SIGTERM before unpause it", c.ID)
sig, ok := signal.SignalMap["TERM"]
if !ok {
return fmt.Errorf("System doesn not support SIGTERM")
}
if err := daemon.kill(c, int(sig)); err != nil {
return fmt.Errorf("sending SIGTERM to container %s with error: %v", c.ID, err)
}
if err := daemon.containerUnpause(c); err != nil {
return fmt.Errorf("Failed to unpause container %s with error: %v", c.ID, err)
}
if _, err := c.WaitStop(10 * time.Second); err != nil {
logrus.Debugf("container %s failed to exit in 10 second of SIGTERM, sending SIGKILL to force", c.ID)
sig, ok := signal.SignalMap["KILL"]
if !ok {
return fmt.Errorf("System does not support SIGKILL")
}
if err := daemon.kill(c, int(sig)); err != nil {
logrus.Errorf("Failed to SIGKILL container %s", c.ID)
}
c.WaitStop(-1 * time.Second)
return err
}
}
// If container failed to exit in 10 seconds of SIGTERM, then using the force
if err := daemon.containerStop(c, 10); err != nil {
return fmt.Errorf("Stop container %s with error: %v", c.ID, err)
}
c.WaitStop(-1 * time.Second)
return nil
}
// Shutdown stops the daemon.
func (daemon *Daemon) Shutdown() error {
daemon.shutdown = true
if daemon.containers != nil {
group := sync.WaitGroup{}
logrus.Debug("starting clean shutdown of all containers...")
for _, cont := range daemon.List() {
if !cont.IsRunning() {
continue
}
logrus.Debugf("stopping %s", cont.ID)
group.Add(1)
go func(c *container.Container) {
defer group.Done()
if err := daemon.shutdownContainer(c); err != nil {
logrus.Errorf("Stop container error: %v", err)
return
}
logrus.Debugf("container stopped %s", c.ID)
}(cont)
}
group.Wait()
}
// trigger libnetwork Stop only if it's initialized
if daemon.netController != nil {
daemon.netController.Stop()
}
if daemon.layerStore != nil {
if err := daemon.layerStore.Cleanup(); err != nil {
logrus.Errorf("Error during layer Store.Cleanup(): %v", err)
}
}
if err := daemon.cleanupMounts(); err != nil {
return err
}
return nil
}
// Mount sets container.BaseFS
// (is it not set coming in? why is it unset?)
func (daemon *Daemon) Mount(container *container.Container) error {
dir, err := container.RWLayer.Mount(container.GetMountLabel())
if err != nil {
return err
}
logrus.Debugf("container mounted via layerStore: %v", dir)
if container.BaseFS != dir {
// The mount path reported by the graph driver should always be trusted on Windows, since the
// volume path for a given mounted layer may change over time. This should only be an error
// on non-Windows operating systems.
if container.BaseFS != "" && runtime.GOOS != "windows" {
daemon.Unmount(container)
return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
daemon.GraphDriverName(), container.ID, container.BaseFS, dir)
}
}
container.BaseFS = dir // TODO: combine these fields
return nil
}
// Unmount unsets the container base filesystem
func (daemon *Daemon) Unmount(container *container.Container) {
if err := container.RWLayer.Unmount(); err != nil {
logrus.Errorf("Error unmounting container %s: %s", container.ID, err)
}
}
// Run uses the execution driver to run a given container
func (daemon *Daemon) Run(c *container.Container, pipes *execdriver.Pipes, startCallback execdriver.DriverCallback) (execdriver.ExitStatus, error) {
hooks := execdriver.Hooks{
Start: startCallback,
}
hooks.PreStart = append(hooks.PreStart, func(processConfig *execdriver.ProcessConfig, pid int, chOOM <-chan struct{}) error {
return daemon.setNetworkNamespaceKey(c.ID, pid)
})
return daemon.execDriver.Run(c.Command, pipes, hooks)
}
func (daemon *Daemon) kill(c *container.Container, sig int) error {
return daemon.execDriver.Kill(c.Command, sig)
}
func (daemon *Daemon) stats(c *container.Container) (*execdriver.ResourceStats, error) {
return daemon.execDriver.Stats(c.ID)
}
func (daemon *Daemon) subscribeToContainerStats(c *container.Container) chan interface{} {
return daemon.statsCollector.collect(c)
}
func (daemon *Daemon) unsubscribeToContainerStats(c *container.Container, ch chan interface{}) {
daemon.statsCollector.unsubscribe(c, ch)
}
func (daemon *Daemon) changes(container *container.Container) ([]archive.Change, error) {
return container.RWLayer.Changes()
}
// TagImage creates a tag in the repository reponame, pointing to the image named
// imageName.
func (daemon *Daemon) TagImage(newTag reference.Named, imageName string) error {
imageID, err := daemon.GetImageID(imageName)
if err != nil {
return err
}
if err := daemon.referenceStore.AddTag(newTag, imageID, true); err != nil {
return err
}
daemon.LogImageEvent(imageID.String(), newTag.String(), "tag")
return nil
}
func writeDistributionProgress(cancelFunc func(), outStream io.Writer, progressChan <-chan progress.Progress) {
progressOutput := streamformatter.NewJSONStreamFormatter().NewProgressOutput(outStream, false)
operationCancelled := false
for prog := range progressChan {
if err := progressOutput.WriteProgress(prog); err != nil && !operationCancelled {
// don't log broken pipe errors as this is the normal case when a client aborts
if isBrokenPipe(err) {
logrus.Info("Pull session cancelled")
} else {
logrus.Errorf("error writing progress to client: %v", err)