forked from kubernetes/kubernetes
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
sync.go
381 lines (321 loc) · 11.9 KB
/
sync.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
/*
Copyright 2017 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 sync
import (
"context"
"fmt"
"net"
"time"
"github.com/golang/glog"
"k8s.io/api/core/v1"
"k8s.io/kubernetes/pkg/controller/nodeipam/ipam/cidrset"
)
const (
// InvalidPodCIDR is the event recorded when a node is found with an
// invalid PodCIDR.
InvalidPodCIDR = "CloudCIDRAllocatorInvalidPodCIDR"
// InvalidModeEvent is the event recorded when the CIDR range cannot be
// sync'd due to the cluster running in the wrong mode.
InvalidModeEvent = "CloudCIDRAllocatorInvalidMode"
// MismatchEvent is the event recorded when the CIDR range allocated in the
// node spec does not match what has been allocated in the cloud.
MismatchEvent = "CloudCIDRAllocatorMismatch"
)
// cloudAlias is the interface to the cloud platform APIs.
type cloudAlias interface {
// Alias returns the IP alias for the node.
Alias(ctx context.Context, nodeName string) (*net.IPNet, error)
// AddAlias adds an alias to the node.
AddAlias(ctx context.Context, nodeName string, cidrRange *net.IPNet) error
}
// kubeAPI is the interface to the Kubernetes APIs.
type kubeAPI interface {
// Node returns the spec for the Node object.
Node(ctx context.Context, name string) (*v1.Node, error)
// UpdateNodePodCIDR updates the PodCIDR in the Node spec.
UpdateNodePodCIDR(ctx context.Context, node *v1.Node, cidrRange *net.IPNet) error
// UpdateNodeNetworkUnavailable updates the network unavailable status for the node.
UpdateNodeNetworkUnavailable(nodeName string, unavailable bool) error
// EmitNodeWarningEvent emits an event for the given node.
EmitNodeWarningEvent(nodeName, reason, fmt string, args ...interface{})
}
// controller is the interface to the controller.
type controller interface {
// ReportResult updates the controller with the result of the latest
// sync operation.
ReportResult(err error)
// ResyncTimeout returns the amount of time to wait before retrying
// a sync with a node.
ResyncTimeout() time.Duration
}
// NodeSyncMode is the mode the cloud CIDR allocator runs in.
type NodeSyncMode string
var (
// SyncFromCloud is the mode that synchronizes the IP allocation from the cloud
// platform to the node.
SyncFromCloud NodeSyncMode = "SyncFromCloud"
// SyncFromCluster is the mode that synchronizes the IP allocation determined
// by the k8s controller to the cloud provider.
SyncFromCluster NodeSyncMode = "SyncFromCluster"
)
// IsValidMode returns true if the given mode is valid.
func IsValidMode(m NodeSyncMode) bool {
switch m {
case SyncFromCloud:
case SyncFromCluster:
default:
return false
}
return true
}
// NodeSync synchronizes the state for a single node in the cluster.
type NodeSync struct {
c controller
cloudAlias cloudAlias
kubeAPI kubeAPI
mode NodeSyncMode
nodeName string
opChan chan syncOp
set *cidrset.CidrSet
}
// New returns a new syncer for a given node.
func New(c controller, cloudAlias cloudAlias, kubeAPI kubeAPI, mode NodeSyncMode, nodeName string, set *cidrset.CidrSet) *NodeSync {
return &NodeSync{
c: c,
cloudAlias: cloudAlias,
kubeAPI: kubeAPI,
mode: mode,
nodeName: nodeName,
opChan: make(chan syncOp, 1),
set: set,
}
}
// Loop runs the sync loop for a given node. done is an optional channel that
// is closed when the Loop() returns.
func (sync *NodeSync) Loop(done chan struct{}) {
glog.V(2).Infof("Starting sync loop for node %q", sync.nodeName)
defer func() {
if done != nil {
close(done)
}
}()
timeout := sync.c.ResyncTimeout()
delayTimer := time.NewTimer(timeout)
glog.V(4).Infof("Resync node %q in %v", sync.nodeName, timeout)
for {
select {
case op, more := <-sync.opChan:
if !more {
glog.V(2).Infof("Stopping sync loop")
return
}
sync.c.ReportResult(op.run(sync))
if !delayTimer.Stop() {
<-delayTimer.C
}
case <-delayTimer.C:
glog.V(4).Infof("Running resync for node %q", sync.nodeName)
sync.c.ReportResult((&updateOp{}).run(sync))
}
timeout := sync.c.ResyncTimeout()
delayTimer.Reset(timeout)
glog.V(4).Infof("Resync node %q in %v", sync.nodeName, timeout)
}
}
// Update causes an update operation on the given node. If node is nil, then
// the syncer will fetch the node spec from the API server before syncing.
//
// This method is safe to call from multiple goroutines.
func (sync *NodeSync) Update(node *v1.Node) {
sync.opChan <- &updateOp{node}
}
// Delete performs the sync operations necessary to remove the node from the
// IPAM state.
//
// This method is safe to call from multiple goroutines.
func (sync *NodeSync) Delete(node *v1.Node) {
sync.opChan <- &deleteOp{node}
close(sync.opChan)
}
// syncOp is the interface for generic sync operation.
type syncOp interface {
// run the requested sync operation.
run(sync *NodeSync) error
}
// updateOp handles creation and updates of a node.
type updateOp struct {
node *v1.Node
}
func (op *updateOp) String() string {
if op.node == nil {
return fmt.Sprintf("updateOp(nil)")
}
return fmt.Sprintf("updateOp(%q,%v)", op.node.Name, op.node.Spec.PodCIDR)
}
func (op *updateOp) run(sync *NodeSync) error {
glog.V(3).Infof("Running updateOp %+v", op)
ctx := context.Background()
if op.node == nil {
glog.V(3).Infof("Getting node spec for %q", sync.nodeName)
node, err := sync.kubeAPI.Node(ctx, sync.nodeName)
if err != nil {
glog.Errorf("Error getting node %q spec: %v", sync.nodeName, err)
return err
}
op.node = node
}
aliasRange, err := sync.cloudAlias.Alias(ctx, sync.nodeName)
if err != nil {
glog.Errorf("Error getting cloud alias for node %q: %v", sync.nodeName, err)
return err
}
switch {
case op.node.Spec.PodCIDR == "" && aliasRange == nil:
err = op.allocateRange(ctx, sync, op.node)
case op.node.Spec.PodCIDR == "" && aliasRange != nil:
err = op.updateNodeFromAlias(ctx, sync, op.node, aliasRange)
case op.node.Spec.PodCIDR != "" && aliasRange == nil:
err = op.updateAliasFromNode(ctx, sync, op.node)
case op.node.Spec.PodCIDR != "" && aliasRange != nil:
err = op.validateRange(ctx, sync, op.node, aliasRange)
}
return err
}
// validateRange checks that the allocated range and the alias range
// match.
func (op *updateOp) validateRange(ctx context.Context, sync *NodeSync, node *v1.Node, aliasRange *net.IPNet) error {
if node.Spec.PodCIDR != aliasRange.String() {
glog.Errorf("Inconsistency detected between node PodCIDR and node alias (%v != %v)",
node.Spec.PodCIDR, aliasRange)
sync.kubeAPI.EmitNodeWarningEvent(node.Name, MismatchEvent,
"Node.Spec.PodCIDR != cloud alias (%v != %v)", node.Spec.PodCIDR, aliasRange)
// User intervention is required in this case, as this is most likely due
// to the user mucking around with their VM aliases on the side.
} else {
glog.V(4).Infof("Node %q CIDR range %v is matches cloud assignment", node.Name, node.Spec.PodCIDR)
}
return nil
}
// updateNodeFromAlias updates the the node from the cloud allocated
// alias.
func (op *updateOp) updateNodeFromAlias(ctx context.Context, sync *NodeSync, node *v1.Node, aliasRange *net.IPNet) error {
if sync.mode != SyncFromCloud {
sync.kubeAPI.EmitNodeWarningEvent(node.Name, InvalidModeEvent,
"Cannot sync from cloud in mode %q", sync.mode)
return fmt.Errorf("cannot sync from cloud in mode %q", sync.mode)
}
glog.V(2).Infof("Updating node spec with alias range, node.PodCIDR = %v", aliasRange)
if err := sync.set.Occupy(aliasRange); err != nil {
glog.Errorf("Error occupying range %v for node %v", aliasRange, sync.nodeName)
return err
}
if err := sync.kubeAPI.UpdateNodePodCIDR(ctx, node, aliasRange); err != nil {
glog.Errorf("Could not update node %q PodCIDR to %v: %v", node.Name, aliasRange, err)
return err
}
glog.V(2).Infof("Node %q PodCIDR set to %v", node.Name, aliasRange)
if err := sync.kubeAPI.UpdateNodeNetworkUnavailable(node.Name, false); err != nil {
glog.Errorf("Could not update node NetworkUnavailable status to false: %v", err)
return err
}
glog.V(2).Infof("Updated node %q PodCIDR from cloud alias %v", node.Name, aliasRange)
return nil
}
// updateAliasFromNode updates the cloud alias given the node allocation.
func (op *updateOp) updateAliasFromNode(ctx context.Context, sync *NodeSync, node *v1.Node) error {
if sync.mode != SyncFromCluster {
sync.kubeAPI.EmitNodeWarningEvent(
node.Name, InvalidModeEvent, "Cannot sync to cloud in mode %q", sync.mode)
return fmt.Errorf("cannot sync to cloud in mode %q", sync.mode)
}
_, aliasRange, err := net.ParseCIDR(node.Spec.PodCIDR)
if err != nil {
glog.Errorf("Could not parse PodCIDR (%q) for node %q: %v",
node.Spec.PodCIDR, node.Name, err)
return err
}
if err := sync.set.Occupy(aliasRange); err != nil {
glog.Errorf("Error occupying range %v for node %v", aliasRange, sync.nodeName)
return err
}
if err := sync.cloudAlias.AddAlias(ctx, node.Name, aliasRange); err != nil {
glog.Errorf("Could not add alias %v for node %q: %v", aliasRange, node.Name, err)
return err
}
if err := sync.kubeAPI.UpdateNodeNetworkUnavailable(node.Name, false); err != nil {
glog.Errorf("Could not update node NetworkUnavailable status to false: %v", err)
return err
}
glog.V(2).Infof("Updated node %q cloud alias with node spec, node.PodCIDR = %v",
node.Name, node.Spec.PodCIDR)
return nil
}
// allocateRange allocates a new range and updates both the cloud
// platform and the node allocation.
func (op *updateOp) allocateRange(ctx context.Context, sync *NodeSync, node *v1.Node) error {
if sync.mode != SyncFromCluster {
sync.kubeAPI.EmitNodeWarningEvent(node.Name, InvalidModeEvent,
"Cannot allocate CIDRs in mode %q", sync.mode)
return fmt.Errorf("controller cannot allocate CIDRS in mode %q", sync.mode)
}
cidrRange, err := sync.set.AllocateNext()
if err != nil {
return err
}
// If addAlias returns a hard error, cidrRange will be leaked as there
// is no durable record of the range. The missing space will be
// recovered on the next restart of the controller.
if err := sync.cloudAlias.AddAlias(ctx, node.Name, cidrRange); err != nil {
glog.Errorf("Could not add alias %v for node %q: %v", cidrRange, node.Name, err)
return err
}
if err := sync.kubeAPI.UpdateNodePodCIDR(ctx, node, cidrRange); err != nil {
glog.Errorf("Could not update node %q PodCIDR to %v: %v", node.Name, cidrRange, err)
return err
}
if err := sync.kubeAPI.UpdateNodeNetworkUnavailable(node.Name, false); err != nil {
glog.Errorf("Could not update node NetworkUnavailable status to false: %v", err)
return err
}
glog.V(2).Infof("Allocated PodCIDR %v for node %q", cidrRange, node.Name)
return nil
}
// deleteOp handles deletion of a node.
type deleteOp struct {
node *v1.Node
}
func (op *deleteOp) String() string {
if op.node == nil {
return fmt.Sprintf("deleteOp(nil)")
}
return fmt.Sprintf("deleteOp(%q,%v)", op.node.Name, op.node.Spec.PodCIDR)
}
func (op *deleteOp) run(sync *NodeSync) error {
glog.V(3).Infof("Running deleteOp %+v", op)
if op.node.Spec.PodCIDR == "" {
glog.V(2).Infof("Node %q was deleted, node had no PodCIDR range assigned", op.node.Name)
return nil
}
_, cidrRange, err := net.ParseCIDR(op.node.Spec.PodCIDR)
if err != nil {
glog.Errorf("Deleted node %q has an invalid podCIDR %q: %v",
op.node.Name, op.node.Spec.PodCIDR, err)
sync.kubeAPI.EmitNodeWarningEvent(op.node.Name, InvalidPodCIDR,
"Node %q has an invalid PodCIDR: %q", op.node.Name, op.node.Spec.PodCIDR)
return nil
}
sync.set.Release(cidrRange)
glog.V(2).Infof("Node %q was deleted, releasing CIDR range %v",
op.node.Name, op.node.Spec.PodCIDR)
return nil
}