forked from msazurestackworkloads/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
rbd_util.go
790 lines (703 loc) · 26.7 KB
/
rbd_util.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
/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
//
// utility functions to setup rbd volume
// mainly implement diskManager interface
//
package rbd
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"strconv"
"strings"
"time"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/wait"
volumehelpers "k8s.io/cloud-provider/volume/helpers"
"k8s.io/klog"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/util/node"
"k8s.io/kubernetes/pkg/volume"
utilpath "k8s.io/utils/path"
)
const (
imageWatcherStr = "watcher="
imageSizeStr = "size "
kubeLockMagic = "kubelet_lock_magic_"
// The following three values are used for 30 seconds timeout
// while waiting for RBD Watcher to expire.
rbdImageWatcherInitDelay = 1 * time.Second
rbdImageWatcherFactor = 1.4
rbdImageWatcherSteps = 10
rbdImageSizeUnitMiB = 1024 * 1024
)
func getDevFromImageAndPool(pool, image string) (string, bool) {
device, found := getRbdDevFromImageAndPool(pool, image)
if found {
return device, true
}
device, found = getNbdDevFromImageAndPool(pool, image)
if found {
return device, true
}
return "", false
}
// Search /sys/bus for rbd device that matches given pool and image.
func getRbdDevFromImageAndPool(pool string, image string) (string, bool) {
// /sys/bus/rbd/devices/X/name and /sys/bus/rbd/devices/X/pool
sys_path := "/sys/bus/rbd/devices"
if dirs, err := ioutil.ReadDir(sys_path); err == nil {
for _, f := range dirs {
// Pool and name format:
// see rbd_pool_show() and rbd_name_show() at
// https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c
name := f.Name()
// First match pool, then match name.
poolFile := path.Join(sys_path, name, "pool")
poolBytes, err := ioutil.ReadFile(poolFile)
if err != nil {
klog.V(4).Infof("error reading %s: %v", poolFile, err)
continue
}
if strings.TrimSpace(string(poolBytes)) != pool {
klog.V(4).Infof("device %s is not %q: %q", name, pool, string(poolBytes))
continue
}
imgFile := path.Join(sys_path, name, "name")
imgBytes, err := ioutil.ReadFile(imgFile)
if err != nil {
klog.V(4).Infof("error reading %s: %v", imgFile, err)
continue
}
if strings.TrimSpace(string(imgBytes)) != image {
klog.V(4).Infof("device %s is not %q: %q", name, image, string(imgBytes))
continue
}
// Found a match, check if device exists.
devicePath := "/dev/rbd" + name
if _, err := os.Lstat(devicePath); err == nil {
return devicePath, true
}
}
}
return "", false
}
func getMaxNbds() (int, error) {
// the max number of nbd devices may be found in maxNbdsPath
// we will check sysfs for possible nbd devices even if this is not available
maxNbdsPath := "/sys/module/nbd/parameters/nbds_max"
_, err := os.Lstat(maxNbdsPath)
if err != nil {
return 0, fmt.Errorf("rbd-nbd: failed to retrieve max_nbds from %s err: %q", maxNbdsPath, err)
}
klog.V(4).Infof("found nbds max parameters file at %s", maxNbdsPath)
maxNbdBytes, err := ioutil.ReadFile(maxNbdsPath)
if err != nil {
return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds from %s err: %q", maxNbdsPath, err)
}
maxNbds, err := strconv.Atoi(strings.TrimSpace(string(maxNbdBytes)))
if err != nil {
return 0, fmt.Errorf("rbd-nbd: failed to read max_nbds err: %q", err)
}
klog.V(4).Infof("rbd-nbd: max_nbds: %d", maxNbds)
return maxNbds, nil
}
// Locate any existing rbd-nbd process mapping given a <pool, image>.
// Recent versions of rbd-nbd tool can correctly provide this info using list-mapped
// but older versions of list-mapped don't.
// The implementation below peeks at the command line of nbd bound processes
// to figure out any mapped images.
func getNbdDevFromImageAndPool(pool string, image string) (string, bool) {
// nbd module exports the pid of serving process in sysfs
basePath := "/sys/block/nbd"
// Do not change imgPath format - some tools like rbd-nbd are strict about it.
imgPath := fmt.Sprintf("%s/%s", pool, image)
maxNbds, maxNbdsErr := getMaxNbds()
if maxNbdsErr != nil {
klog.V(4).Infof("error reading nbds_max %v", maxNbdsErr)
return "", false
}
for i := 0; i < maxNbds; i++ {
nbdPath := basePath + strconv.Itoa(i)
_, err := os.Lstat(nbdPath)
if err != nil {
klog.V(4).Infof("error reading nbd info directory %s: %v", nbdPath, err)
continue
}
pidBytes, err := ioutil.ReadFile(path.Join(nbdPath, "pid"))
if err != nil {
klog.V(5).Infof("did not find valid pid file in dir %s: %v", nbdPath, err)
continue
}
cmdlineFileName := path.Join("/proc", strings.TrimSpace(string(pidBytes)), "cmdline")
rawCmdline, err := ioutil.ReadFile(cmdlineFileName)
if err != nil {
klog.V(4).Infof("failed to read cmdline file %s: %v", cmdlineFileName, err)
continue
}
cmdlineArgs := strings.FieldsFunc(string(rawCmdline), func(r rune) bool {
return r == '\u0000'
})
// Check if this process is mapping a rbd device.
// Only accepted pattern of cmdline is from execRbdMap:
// rbd-nbd map pool/image ...
if len(cmdlineArgs) < 3 || cmdlineArgs[0] != "rbd-nbd" || cmdlineArgs[1] != "map" {
klog.V(4).Infof("nbd device %s is not used by rbd", nbdPath)
continue
}
if cmdlineArgs[2] != imgPath {
klog.V(4).Infof("rbd-nbd device %s did not match expected image path: %s with path found: %s",
nbdPath, imgPath, cmdlineArgs[2])
continue
}
devicePath := path.Join("/dev", "nbd"+strconv.Itoa(i))
if _, err := os.Lstat(devicePath); err != nil {
klog.Warningf("Stat device %s for imgpath %s failed %v", devicePath, imgPath, err)
continue
}
return devicePath, true
}
return "", false
}
// Stat a path, if it doesn't exist, retry maxRetries times.
func waitForPath(pool, image string, maxRetries int, useNbdDriver bool) (string, bool) {
for i := 0; i < maxRetries; i++ {
if i != 0 {
time.Sleep(time.Second)
}
if useNbdDriver {
if devicePath, found := getNbdDevFromImageAndPool(pool, image); found {
return devicePath, true
}
} else {
if devicePath, found := getRbdDevFromImageAndPool(pool, image); found {
return devicePath, true
}
}
}
return "", false
}
// Execute command to map a rbd device for mounter.
// rbdCmd is driver dependent and either "rbd" or "rbd-nbd".
func execRbdMap(b rbdMounter, rbdCmd string, mon string) ([]byte, error) {
// Commandline: rbdCmd map imgPath ...
// do not change this format - some tools like rbd-nbd are strict about it.
imgPath := fmt.Sprintf("%s/%s", b.Pool, b.Image)
if b.Secret != "" {
return b.exec.Run(rbdCmd,
"map", imgPath, "--id", b.Id, "-m", mon, "--key="+b.Secret)
} else {
return b.exec.Run(rbdCmd,
"map", imgPath, "--id", b.Id, "-m", mon, "-k", b.Keyring)
}
}
// Check if rbd-nbd tools are installed.
func checkRbdNbdTools(e mount.Exec) bool {
_, err := e.Run("modprobe", "nbd")
if err != nil {
klog.V(5).Infof("rbd-nbd: nbd modprobe failed with error %v", err)
return false
}
if _, err := e.Run("rbd-nbd", "--version"); err != nil {
klog.V(5).Infof("rbd-nbd: getting rbd-nbd version failed with error %v", err)
return false
}
klog.V(3).Infof("rbd-nbd tools were found.")
return true
}
// Make a directory like /var/lib/kubelet/plugins/kubernetes.io/rbd/mounts/pool-image-image.
func makePDNameInternal(host volume.VolumeHost, pool string, image string) string {
// Backward compatibility for the deprecated format: /var/lib/kubelet/plugins/kubernetes.io/rbd/rbd/pool-image-image.
deprecatedDir := path.Join(host.GetPluginDir(rbdPluginName), "rbd", pool+"-image-"+image)
info, err := os.Stat(deprecatedDir)
if err == nil && info.IsDir() {
// The device mount path has already been created with the deprecated format, return it.
klog.V(5).Infof("Deprecated format path %s found", deprecatedDir)
return deprecatedDir
}
// Return the canonical format path.
return path.Join(host.GetPluginDir(rbdPluginName), mount.MountsInGlobalPDPath, pool+"-image-"+image)
}
// Make a directory like /var/lib/kubelet/plugins/kubernetes.io/rbd/volumeDevices/pool-image-image.
func makeVDPDNameInternal(host volume.VolumeHost, pool string, image string) string {
return path.Join(host.GetVolumeDevicePluginDir(rbdPluginName), pool+"-image-"+image)
}
// RBDUtil implements diskManager interface.
type RBDUtil struct{}
var _ diskManager = &RBDUtil{}
func (util *RBDUtil) MakeGlobalPDName(rbd rbd) string {
return makePDNameInternal(rbd.plugin.host, rbd.Pool, rbd.Image)
}
func (util *RBDUtil) MakeGlobalVDPDName(rbd rbd) string {
return makeVDPDNameInternal(rbd.plugin.host, rbd.Pool, rbd.Image)
}
func rbdErrors(runErr, resultErr error) error {
if err, ok := runErr.(*exec.Error); ok {
if err.Err == exec.ErrNotFound {
return fmt.Errorf("rbd: rbd cmd not found")
}
}
return resultErr
}
// 'rbd' utility builds a comma-separated list of monitor addresses from '-m' /
// '--mon_host` parameter (comma, semi-colon, or white-space delimited monitor
// addresses) and send it to kernel rbd/libceph modules, which can accept
// comma-seprated list of monitor addresses (e.g. ip1[:port1][,ip2[:port2]...])
// in their first version in linux (see
// https://github.com/torvalds/linux/blob/602adf400201636e95c3fed9f31fba54a3d7e844/net/ceph/ceph_common.c#L239).
// Also, libceph module chooses monitor randomly, so we can simply pass all
// addresses without randomization (see
// https://github.com/torvalds/linux/blob/602adf400201636e95c3fed9f31fba54a3d7e844/net/ceph/mon_client.c#L132).
func (util *RBDUtil) kernelRBDMonitorsOpt(mons []string) string {
return strings.Join(mons, ",")
}
// rbdUnlock releases a lock on image if found.
func (util *RBDUtil) rbdUnlock(b rbdMounter) error {
var err error
var output, locker string
var cmd []byte
var secret_opt []string
if b.Secret != "" {
secret_opt = []string{"--key=" + b.Secret}
} else {
secret_opt = []string{"-k", b.Keyring}
}
if len(b.adminId) == 0 {
b.adminId = b.Id
}
if len(b.adminSecret) == 0 {
b.adminSecret = b.Secret
}
// Construct lock id using host name and a magic prefix.
hostName, err := node.GetHostname("")
if err != nil {
return err
}
lock_id := kubeLockMagic + hostName
mon := util.kernelRBDMonitorsOpt(b.Mon)
// Get the locker name, something like "client.1234".
args := []string{"lock", "list", b.Image, "--pool", b.Pool, "--id", b.Id, "-m", mon}
args = append(args, secret_opt...)
cmd, err = b.exec.Run("rbd", args...)
output = string(cmd)
klog.V(4).Infof("lock list output %q", output)
if err != nil {
return err
}
ind := strings.LastIndex(output, lock_id) - 1
for i := ind; i >= 0; i-- {
if output[i] == '\n' {
locker = output[(i + 1):ind]
break
}
}
// Remove a lock if found: rbd lock remove.
if len(locker) > 0 {
args := []string{"lock", "remove", b.Image, lock_id, locker, "--pool", b.Pool, "--id", b.Id, "-m", mon}
args = append(args, secret_opt...)
cmd, err = b.exec.Run("rbd", args...)
if err == nil {
klog.V(4).Infof("rbd: successfully remove lock (locker_id: %s) on image: %s/%s with id %s mon %s", lock_id, b.Pool, b.Image, b.Id, mon)
} else {
klog.Warningf("rbd: failed to remove lock (lock_id: %s) on image: %s/%s with id %s mon %s: %v", lock_id, b.Pool, b.Image, b.Id, mon, err)
}
}
return err
}
// AttachDisk attaches the disk on the node.
func (util *RBDUtil) AttachDisk(b rbdMounter) (string, error) {
var output []byte
globalPDPath := util.MakeGlobalPDName(*b.rbd)
if pathExists, pathErr := mount.PathExists(globalPDPath); pathErr != nil {
return "", fmt.Errorf("Error checking if path exists: %v", pathErr)
} else if !pathExists {
if err := os.MkdirAll(globalPDPath, 0750); err != nil {
return "", err
}
}
// Evalute whether this device was mapped with rbd.
devicePath, mapped := waitForPath(b.Pool, b.Image, 1 /*maxRetries*/, false /*useNbdDriver*/)
// If rbd-nbd tools are found, we will fallback to it should the default krbd driver fail.
nbdToolsFound := false
if !mapped {
nbdToolsFound = checkRbdNbdTools(b.exec)
if nbdToolsFound {
devicePath, mapped = waitForPath(b.Pool, b.Image, 1 /*maxRetries*/, true /*useNbdDriver*/)
}
}
if !mapped {
// Currently, we don't acquire advisory lock on image, but for backward
// compatibility, we need to check if the image is being used by nodes running old kubelet.
// osd_client_watch_timeout defaults to 30 seconds, if the watcher stays active longer than 30 seconds,
// rbd image does not get mounted and failure message gets generated.
backoff := wait.Backoff{
Duration: rbdImageWatcherInitDelay,
Factor: rbdImageWatcherFactor,
Steps: rbdImageWatcherSteps,
}
needValidUsed := true
if b.accessModes != nil {
// If accessModes only contains ReadOnlyMany, we don't need check rbd status of being used.
if len(b.accessModes) == 1 && b.accessModes[0] == v1.ReadOnlyMany {
needValidUsed = false
}
}
// If accessModes is nil, the volume is referenced by in-line volume.
// We can assume the AccessModes to be {"RWO" and "ROX"}, which is what the volume plugin supports.
// We do not need to consider ReadOnly here, because it is used for VolumeMounts.
if needValidUsed {
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
used, rbdOutput, err := util.rbdStatus(&b)
if err != nil {
return false, fmt.Errorf("fail to check rbd image status with: (%v), rbd output: (%s)", err, rbdOutput)
}
return !used, nil
})
// Return error if rbd image has not become available for the specified timeout.
if err == wait.ErrWaitTimeout {
return "", fmt.Errorf("rbd image %s/%s is still being used", b.Pool, b.Image)
}
// Return error if any other errors were encountered during waiting for the image to become available.
if err != nil {
return "", err
}
}
mon := util.kernelRBDMonitorsOpt(b.Mon)
klog.V(1).Infof("rbd: map mon %s", mon)
_, err := b.exec.Run("modprobe", "rbd")
if err != nil {
klog.Warningf("rbd: failed to load rbd kernel module:%v", err)
}
output, err = execRbdMap(b, "rbd", mon)
if err != nil {
if !nbdToolsFound {
klog.V(1).Infof("rbd: map error %v, rbd output: %s", err, string(output))
return "", fmt.Errorf("rbd: map failed %v, rbd output: %s", err, string(output))
}
klog.V(3).Infof("rbd: map failed with %v, %s. Retrying with rbd-nbd", err, string(output))
errList := []error{err}
outputList := output
output, err = execRbdMap(b, "rbd-nbd", mon)
if err != nil {
errList = append(errList, err)
outputList = append(outputList, output...)
return "", fmt.Errorf("rbd: map failed %v, rbd output: %s", errors.NewAggregate(errList), string(outputList))
}
devicePath, mapped = waitForPath(b.Pool, b.Image, 10 /*maxRetries*/, true /*useNbdDrive*/)
} else {
devicePath, mapped = waitForPath(b.Pool, b.Image, 10 /*maxRetries*/, false /*useNbdDriver*/)
}
if !mapped {
return "", fmt.Errorf("Could not map image %s/%s, Timeout after 10s", b.Pool, b.Image)
}
}
return devicePath, nil
}
// DetachDisk detaches the disk from the node.
// It detaches device from the node if device is provided, and removes the lock
// if there is persisted RBD info under deviceMountPath.
func (util *RBDUtil) DetachDisk(plugin *rbdPlugin, deviceMountPath string, device string) error {
if len(device) == 0 {
return fmt.Errorf("DetachDisk failed , device is empty")
}
exec := plugin.host.GetExec(plugin.GetPluginName())
var rbdCmd string
// Unlike map, we cannot fallthrough for unmap
// the tool to unmap is based on device type
if strings.HasPrefix(device, "/dev/nbd") {
rbdCmd = "rbd-nbd"
} else {
rbdCmd = "rbd"
}
// rbd unmap
output, err := exec.Run(rbdCmd, "unmap", device)
if err != nil {
return rbdErrors(err, fmt.Errorf("rbd: failed to unmap device %s, error %v, rbd output: %v", device, err, output))
}
klog.V(3).Infof("rbd: successfully unmap device %s", device)
// Currently, we don't persist rbd info on the disk, but for backward
// compatbility, we need to clean it if found.
rbdFile := path.Join(deviceMountPath, "rbd.json")
exists, err := utilpath.Exists(utilpath.CheckFollowSymlink, rbdFile)
if err != nil {
return err
}
if exists {
klog.V(3).Infof("rbd: old rbd.json is found under %s, cleaning it", deviceMountPath)
err = util.cleanOldRBDFile(plugin, rbdFile)
if err != nil {
klog.Errorf("rbd: failed to clean %s", rbdFile)
return err
}
klog.V(3).Infof("rbd: successfully remove %s", rbdFile)
}
return nil
}
// DetachBlockDisk detaches the disk from the node.
func (util *RBDUtil) DetachBlockDisk(disk rbdDiskUnmapper, mapPath string) error {
if pathExists, pathErr := mount.PathExists(mapPath); pathErr != nil {
return fmt.Errorf("Error checking if path exists: %v", pathErr)
} else if !pathExists {
klog.Warningf("Warning: Unmap skipped because path does not exist: %v", mapPath)
return nil
}
// If we arrive here, device is no longer used, see if we need to logout of the target
device, err := getBlockVolumeDevice(mapPath)
if err != nil {
return err
}
if len(device) == 0 {
return fmt.Errorf("DetachDisk failed , device is empty")
}
exec := disk.plugin.host.GetExec(disk.plugin.GetPluginName())
var rbdCmd string
// Unlike map, we cannot fallthrough here.
// Any nbd device must be unmapped by rbd-nbd
if strings.HasPrefix(device, "/dev/nbd") {
rbdCmd = "rbd-nbd"
klog.V(4).Infof("rbd: using rbd-nbd for unmap function")
} else {
rbdCmd = "rbd"
klog.V(4).Infof("rbd: using rbd for unmap function")
}
// rbd unmap
output, err := exec.Run(rbdCmd, "unmap", device)
if err != nil {
return rbdErrors(err, fmt.Errorf("rbd: failed to unmap device %s, error %v, rbd output: %s", device, err, string(output)))
}
klog.V(3).Infof("rbd: successfully unmap device %s", device)
return nil
}
// cleanOldRBDFile read rbd info from rbd.json file and removes lock if found.
// At last, it removes rbd.json file.
func (util *RBDUtil) cleanOldRBDFile(plugin *rbdPlugin, rbdFile string) error {
mounter := &rbdMounter{
// util.rbdUnlock needs it to run command.
rbd: newRBD("", "", "", "", false, plugin, util),
}
fp, err := os.Open(rbdFile)
if err != nil {
return fmt.Errorf("rbd: open err %s/%s", rbdFile, err)
}
defer fp.Close()
decoder := json.NewDecoder(fp)
if err = decoder.Decode(mounter); err != nil {
return fmt.Errorf("rbd: decode err: %v.", err)
}
if err != nil {
klog.Errorf("failed to load rbd info from %s: %v", rbdFile, err)
return err
}
// Remove rbd lock if found.
// The disk is not attached to this node anymore, so the lock on image
// for this node can be removed safely.
err = util.rbdUnlock(*mounter)
if err == nil {
os.Remove(rbdFile)
}
return err
}
func (util *RBDUtil) CreateImage(p *rbdVolumeProvisioner) (r *v1.RBDPersistentVolumeSource, size int, err error) {
var output []byte
capacity := p.options.PVC.Spec.Resources.Requests[v1.ResourceName(v1.ResourceStorage)]
// Convert to MB that rbd defaults on.
sz, err := volumehelpers.RoundUpToMiBInt(capacity)
if err != nil {
return nil, 0, err
}
volSz := fmt.Sprintf("%d", sz)
mon := util.kernelRBDMonitorsOpt(p.Mon)
if p.rbdMounter.imageFormat == rbdImageFormat2 {
klog.V(4).Infof("rbd: create %s size %s format %s (features: %s) using mon %s, pool %s id %s key %s", p.rbdMounter.Image, volSz, p.rbdMounter.imageFormat, p.rbdMounter.imageFeatures, mon, p.rbdMounter.Pool, p.rbdMounter.adminId, p.rbdMounter.adminSecret)
} else {
klog.V(4).Infof("rbd: create %s size %s format %s using mon %s, pool %s id %s key %s", p.rbdMounter.Image, volSz, p.rbdMounter.imageFormat, mon, p.rbdMounter.Pool, p.rbdMounter.adminId, p.rbdMounter.adminSecret)
}
args := []string{"create", p.rbdMounter.Image, "--size", volSz, "--pool", p.rbdMounter.Pool, "--id", p.rbdMounter.adminId, "-m", mon, "--key=" + p.rbdMounter.adminSecret, "--image-format", p.rbdMounter.imageFormat}
if p.rbdMounter.imageFormat == rbdImageFormat2 {
// If no image features is provided, it results in empty string
// which disable all RBD image format 2 features as expected.
features := strings.Join(p.rbdMounter.imageFeatures, ",")
args = append(args, "--image-feature", features)
}
output, err = p.exec.Run("rbd", args...)
if err != nil {
klog.Warningf("failed to create rbd image, output %v", string(output))
return nil, 0, fmt.Errorf("failed to create rbd image: %v, command output: %s", err, string(output))
}
return &v1.RBDPersistentVolumeSource{
CephMonitors: p.rbdMounter.Mon,
RBDImage: p.rbdMounter.Image,
RBDPool: p.rbdMounter.Pool,
}, sz, nil
}
func (util *RBDUtil) DeleteImage(p *rbdVolumeDeleter) error {
var output []byte
found, rbdOutput, err := util.rbdStatus(p.rbdMounter)
if err != nil {
return fmt.Errorf("error %v, rbd output: %v", err, rbdOutput)
}
if found {
klog.Info("rbd is still being used ", p.rbdMounter.Image)
return fmt.Errorf("rbd image %s/%s is still being used, rbd output: %v", p.rbdMounter.Pool, p.rbdMounter.Image, rbdOutput)
}
// rbd rm.
mon := util.kernelRBDMonitorsOpt(p.rbdMounter.Mon)
klog.V(4).Infof("rbd: rm %s using mon %s, pool %s id %s key %s", p.rbdMounter.Image, mon, p.rbdMounter.Pool, p.rbdMounter.adminId, p.rbdMounter.adminSecret)
output, err = p.exec.Run("rbd",
"rm", p.rbdMounter.Image, "--pool", p.rbdMounter.Pool, "--id", p.rbdMounter.adminId, "-m", mon, "--key="+p.rbdMounter.adminSecret)
if err == nil {
return nil
}
klog.Errorf("failed to delete rbd image: %v, command output: %s", err, string(output))
return fmt.Errorf("error %v, rbd output: %v", err, string(output))
}
// ExpandImage runs rbd resize command to resize the specified image.
func (util *RBDUtil) ExpandImage(rbdExpander *rbdVolumeExpander, oldSize resource.Quantity, newSize resource.Quantity) (resource.Quantity, error) {
var output []byte
var err error
// Convert to MB that rbd defaults on.
sz := int(volumehelpers.RoundUpToMiB(newSize))
newVolSz := fmt.Sprintf("%d", sz)
newSizeQuant := resource.MustParse(fmt.Sprintf("%dMi", sz))
// Check the current size of rbd image, if equals to or greater that the new request size, do nothing.
curSize, infoErr := util.rbdInfo(rbdExpander.rbdMounter)
if infoErr != nil {
return oldSize, fmt.Errorf("rbd info failed, error: %v", infoErr)
}
if curSize >= sz {
return newSizeQuant, nil
}
// rbd resize.
mon := util.kernelRBDMonitorsOpt(rbdExpander.rbdMounter.Mon)
klog.V(4).Infof("rbd: resize %s using mon %s, pool %s id %s key %s", rbdExpander.rbdMounter.Image, mon, rbdExpander.rbdMounter.Pool, rbdExpander.rbdMounter.adminId, rbdExpander.rbdMounter.adminSecret)
output, err = rbdExpander.exec.Run("rbd",
"resize", rbdExpander.rbdMounter.Image, "--size", newVolSz, "--pool", rbdExpander.rbdMounter.Pool, "--id", rbdExpander.rbdMounter.adminId, "-m", mon, "--key="+rbdExpander.rbdMounter.adminSecret)
if err == nil {
return newSizeQuant, nil
}
klog.Errorf("failed to resize rbd image: %v, command output: %s", err, string(output))
return oldSize, err
}
// rbdInfo runs `rbd info` command to get the current image size in MB.
func (util *RBDUtil) rbdInfo(b *rbdMounter) (int, error) {
var err error
var output []byte
// If we don't have admin id/secret (e.g. attaching), fallback to user id/secret.
id := b.adminId
secret := b.adminSecret
if id == "" {
id = b.Id
secret = b.Secret
}
mon := util.kernelRBDMonitorsOpt(b.Mon)
// cmd "rbd info" get the image info with the following output:
//
// # image exists (exit=0)
// rbd info volume-4a5bcc8b-2b55-46da-ba04-0d3dc5227f08
// size 1024 MB in 256 objects
// order 22 (4096 kB objects)
// block_name_prefix: rbd_data.1253ac238e1f29
// format: 2
// ...
//
// rbd info volume-4a5bcc8b-2b55-46da-ba04-0d3dc5227f08 --format json
// {"name":"volume-4a5bcc8b-2b55-46da-ba04-0d3dc5227f08","size":1073741824,"objects":256,"order":22,"object_size":4194304,"block_name_prefix":"rbd_data.1253ac238e1f29","format":2,"features":["layering","exclusive-lock","object-map","fast-diff","deep-flatten"],"flags":[]}
//
//
// # image does not exist (exit=2)
// rbd: error opening image 1234: (2) No such file or directory
//
klog.V(4).Infof("rbd: info %s using mon %s, pool %s id %s key %s", b.Image, mon, b.Pool, id, secret)
output, err = b.exec.Run("rbd",
"info", b.Image, "--pool", b.Pool, "-m", mon, "--id", id, "--key="+secret, "--format=json")
if err, ok := err.(*exec.Error); ok {
if err.Err == exec.ErrNotFound {
klog.Errorf("rbd cmd not found")
// fail fast if rbd command is not found.
return 0, err
}
}
// If command never succeed, returns its last error.
if err != nil {
return 0, err
}
if len(output) == 0 {
return 0, fmt.Errorf("can not get image size info %s: %s", b.Image, string(output))
}
return getRbdImageSize(output)
}
func getRbdImageSize(output []byte) (int, error) {
info := struct {
Size int64 `json:"size"`
}{}
if err := json.Unmarshal(output, &info); err != nil {
return 0, fmt.Errorf("parse rbd info output failed: %s, %v", string(output), err)
}
return int(info.Size / rbdImageSizeUnitMiB), nil
}
// rbdStatus runs `rbd status` command to check if there is watcher on the image.
func (util *RBDUtil) rbdStatus(b *rbdMounter) (bool, string, error) {
var err error
var output string
var cmd []byte
// If we don't have admin id/secret (e.g. attaching), fallback to user id/secret.
id := b.adminId
secret := b.adminSecret
if id == "" {
id = b.Id
secret = b.Secret
}
mon := util.kernelRBDMonitorsOpt(b.Mon)
// cmd "rbd status" list the rbd client watch with the following output:
//
// # there is a watcher (exit=0)
// Watchers:
// watcher=10.16.153.105:0/710245699 client.14163 cookie=1
//
// # there is no watcher (exit=0)
// Watchers: none
//
// Otherwise, exit is non-zero, for example:
//
// # image does not exist (exit=2)
// rbd: error opening image kubernetes-dynamic-pvc-<UUID>: (2) No such file or directory
//
klog.V(4).Infof("rbd: status %s using mon %s, pool %s id %s key %s", b.Image, mon, b.Pool, id, secret)
cmd, err = b.exec.Run("rbd",
"status", b.Image, "--pool", b.Pool, "-m", mon, "--id", id, "--key="+secret)
output = string(cmd)
if err, ok := err.(*exec.Error); ok {
if err.Err == exec.ErrNotFound {
klog.Errorf("rbd cmd not found")
// fail fast if command not found
return false, output, err
}
}
// If command never succeed, returns its last error.
if err != nil {
return false, output, err
}
if strings.Contains(output, imageWatcherStr) {
klog.V(4).Infof("rbd: watchers on %s: %s", b.Image, output)
return true, output, nil
} else {
klog.Warningf("rbd: no watchers on %s", b.Image)
return false, output, nil
}
}