forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 14
/
cephfs.go
317 lines (270 loc) · 8.27 KB
/
cephfs.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
/*
Copyright 2015 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 cephfs
import (
"fmt"
"os"
"strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/mount"
utilstrings "k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
)
// This is the primary entrypoint for volume plugins.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&cephfsPlugin{nil}}
}
type cephfsPlugin struct {
host volume.VolumeHost
}
var _ volume.VolumePlugin = &cephfsPlugin{}
const (
cephfsPluginName = "kubernetes.io/cephfs"
)
func (plugin *cephfsPlugin) Init(host volume.VolumeHost) error {
plugin.host = host
return nil
}
func (plugin *cephfsPlugin) GetPluginName() string {
return cephfsPluginName
}
func (plugin *cephfsPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
return fmt.Sprintf("%v", volumeSource.Monitors), nil
}
func (plugin *cephfsPlugin) CanSupport(spec *volume.Spec) bool {
return (spec.Volume != nil && spec.Volume.CephFS != nil) || (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.CephFS != nil)
}
func (plugin *cephfsPlugin) RequiresRemount() bool {
return false
}
func (plugin *cephfsPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
api.ReadWriteMany,
}
}
func (plugin *cephfsPlugin) NewMounter(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Mounter, error) {
cephvs, _, err := getVolumeSource(spec)
if err != nil {
return nil, err
}
secret := ""
if cephvs.SecretRef != nil {
kubeClient := plugin.host.GetKubeClient()
if kubeClient == nil {
return nil, fmt.Errorf("Cannot get kube client")
}
secretName, err := kubeClient.Core().Secrets(pod.Namespace).Get(cephvs.SecretRef.Name)
if err != nil {
err = fmt.Errorf("Couldn't get secret %v/%v err: %v", pod.Namespace, cephvs.SecretRef, err)
return nil, err
}
for name, data := range secretName.Data {
secret = string(data)
glog.V(1).Infof("found ceph secret info: %s", name)
}
}
return plugin.newMounterInternal(spec, pod.UID, plugin.host.GetMounter(), secret)
}
func (plugin *cephfsPlugin) newMounterInternal(spec *volume.Spec, podUID types.UID, mounter mount.Interface, secret string) (volume.Mounter, error) {
cephvs, _, err := getVolumeSource(spec)
if err != nil {
return nil, err
}
id := cephvs.User
if id == "" {
id = "admin"
}
path := cephvs.Path
if path == "" {
path = "/"
}
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
secret_file := cephvs.SecretFile
if secret_file == "" {
secret_file = "/etc/ceph/" + id + ".secret"
}
return &cephfsMounter{
cephfs: &cephfs{
podUID: podUID,
volName: spec.Name(),
mon: cephvs.Monitors,
path: path,
secret: secret,
id: id,
secret_file: secret_file,
readonly: cephvs.ReadOnly,
mounter: mounter,
plugin: plugin},
}, nil
}
func (plugin *cephfsPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
return plugin.newUnmounterInternal(volName, podUID, plugin.host.GetMounter())
}
func (plugin *cephfsPlugin) newUnmounterInternal(volName string, podUID types.UID, mounter mount.Interface) (volume.Unmounter, error) {
return &cephfsUnmounter{
cephfs: &cephfs{
podUID: podUID,
volName: volName,
mounter: mounter,
plugin: plugin},
}, nil
}
func (plugin *cephfsPlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
cephfsVolume := &api.Volume{
Name: volumeName,
VolumeSource: api.VolumeSource{
CephFS: &api.CephFSVolumeSource{
Monitors: []string{},
Path: volumeName,
},
},
}
return volume.NewSpecFromVolume(cephfsVolume), nil
}
// CephFS volumes represent a bare host file or directory mount of an CephFS export.
type cephfs struct {
volName string
podUID types.UID
mon []string
path string
id string
secret string
secret_file string
readonly bool
mounter mount.Interface
plugin *cephfsPlugin
volume.MetricsNil
}
type cephfsMounter struct {
*cephfs
}
var _ volume.Mounter = &cephfsMounter{}
func (cephfsVolume *cephfsMounter) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: cephfsVolume.readonly,
Managed: false,
SupportsSELinux: false,
}
}
// SetUp attaches the disk and bind mounts to the volume path.
func (cephfsVolume *cephfsMounter) SetUp(fsGroup *int64) error {
return cephfsVolume.SetUpAt(cephfsVolume.GetPath(), fsGroup)
}
// SetUpAt attaches the disk and bind mounts to the volume path.
func (cephfsVolume *cephfsMounter) SetUpAt(dir string, fsGroup *int64) error {
notMnt, err := cephfsVolume.mounter.IsLikelyNotMountPoint(dir)
glog.V(4).Infof("CephFS mount set up: %s %v %v", dir, !notMnt, err)
if err != nil && !os.IsNotExist(err) {
return err
}
if !notMnt {
return nil
}
os.MkdirAll(dir, 0750)
err = cephfsVolume.execMount(dir)
if err == nil {
return nil
}
// cleanup upon failure
cephfsVolume.cleanup(dir)
// return error
return err
}
type cephfsUnmounter struct {
*cephfs
}
var _ volume.Unmounter = &cephfsUnmounter{}
// TearDown unmounts the bind mount
func (cephfsVolume *cephfsUnmounter) TearDown() error {
return cephfsVolume.TearDownAt(cephfsVolume.GetPath())
}
// TearDownAt unmounts the bind mount
func (cephfsVolume *cephfsUnmounter) TearDownAt(dir string) error {
return cephfsVolume.cleanup(dir)
}
// GatePath creates global mount path
func (cephfsVolume *cephfs) GetPath() string {
name := cephfsPluginName
return cephfsVolume.plugin.host.GetPodVolumeDir(cephfsVolume.podUID, utilstrings.EscapeQualifiedNameForDisk(name), cephfsVolume.volName)
}
func (cephfsVolume *cephfs) cleanup(dir string) error {
noMnt, err := cephfsVolume.mounter.IsLikelyNotMountPoint(dir)
if err != nil && !os.IsNotExist(err) {
return fmt.Errorf("CephFS: Error checking IsLikelyNotMountPoint: %v", err)
}
if noMnt {
return os.RemoveAll(dir)
}
if err := cephfsVolume.mounter.Unmount(dir); err != nil {
return fmt.Errorf("CephFS: Unmounting failed: %v", err)
}
noMnt, mntErr := cephfsVolume.mounter.IsLikelyNotMountPoint(dir)
if mntErr != nil {
return fmt.Errorf("CephFS: IsMountpoint check failed: %v", mntErr)
}
if noMnt {
if err := os.RemoveAll(dir); err != nil {
return fmt.Errorf("CephFS: removeAll %s/%v", dir, err)
}
}
return nil
}
func (cephfsVolume *cephfs) execMount(mountpoint string) error {
// cephfs mount option
ceph_opt := ""
// override secretfile if secret is provided
if cephfsVolume.secret != "" {
ceph_opt = "name=" + cephfsVolume.id + ",secret=" + cephfsVolume.secret
} else {
ceph_opt = "name=" + cephfsVolume.id + ",secretfile=" + cephfsVolume.secret_file
}
// build option array
opt := []string{}
if cephfsVolume.readonly {
opt = append(opt, "ro")
}
opt = append(opt, ceph_opt)
// build src like mon1:6789,mon2:6789,mon3:6789:/
hosts := cephfsVolume.mon
l := len(hosts)
// pass all monitors and let ceph randomize and fail over
i := 0
src := ""
for i = 0; i < l-1; i++ {
src += hosts[i] + ","
}
src += hosts[i] + ":" + cephfsVolume.path
if err := cephfsVolume.mounter.Mount(src, mountpoint, "ceph", opt); err != nil {
return fmt.Errorf("CephFS: mount failed: %v", err)
}
return nil
}
func getVolumeSource(spec *volume.Spec) (*api.CephFSVolumeSource, bool, error) {
if spec.Volume != nil && spec.Volume.CephFS != nil {
return spec.Volume.CephFS, spec.Volume.CephFS.ReadOnly, nil
} else if spec.PersistentVolume != nil &&
spec.PersistentVolume.Spec.CephFS != nil {
return spec.PersistentVolume.Spec.CephFS, spec.ReadOnly, nil
}
return nil, false, fmt.Errorf("Spec does not reference a CephFS volume type")
}