-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
controller.go
297 lines (257 loc) · 11.4 KB
/
controller.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
/*
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.
*/
package master
import (
"fmt"
"net"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
utilnet "k8s.io/apimachinery/pkg/util/net"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
genericapiserver "k8s.io/apiserver/pkg/server"
utilfeature "k8s.io/apiserver/pkg/util/feature"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/klog"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/master/reconcilers"
"k8s.io/kubernetes/pkg/registry/core/rangeallocation"
corerest "k8s.io/kubernetes/pkg/registry/core/rest"
servicecontroller "k8s.io/kubernetes/pkg/registry/core/service/ipallocator/controller"
portallocatorcontroller "k8s.io/kubernetes/pkg/registry/core/service/portallocator/controller"
"k8s.io/kubernetes/pkg/util/async"
)
const kubernetesServiceName = "kubernetes"
// Controller is the controller manager for the core bootstrap Kubernetes
// controller loops, which manage creating the "kubernetes" service, the
// "default", "kube-system" and "kube-public" namespaces, and provide the IP
// repair check on service IPs
type Controller struct {
ServiceClient corev1client.ServicesGetter
NamespaceClient corev1client.NamespacesGetter
EventClient corev1client.EventsGetter
ServiceClusterIPRegistry rangeallocation.RangeRegistry
ServiceClusterIPInterval time.Duration
ServiceClusterIPRange net.IPNet
ServiceNodePortRegistry rangeallocation.RangeRegistry
ServiceNodePortInterval time.Duration
ServiceNodePortRange utilnet.PortRange
EndpointReconciler reconcilers.EndpointReconciler
EndpointInterval time.Duration
SystemNamespaces []string
SystemNamespacesInterval time.Duration
PublicIP net.IP
// ServiceIP indicates where the kubernetes service will live. It may not be nil.
ServiceIP net.IP
ServicePort int
ExtraServicePorts []corev1.ServicePort
ExtraEndpointPorts []corev1.EndpointPort
PublicServicePort int
KubernetesServiceNodePort int
runner *async.Runner
}
// NewBootstrapController returns a controller for watching the core capabilities of the master
func (c *completedConfig) NewBootstrapController(legacyRESTStorage corerest.LegacyRESTStorage, serviceClient corev1client.ServicesGetter, nsClient corev1client.NamespacesGetter, eventClient corev1client.EventsGetter) *Controller {
_, publicServicePort, err := c.GenericConfig.SecureServing.HostPort()
if err != nil {
klog.Fatalf("failed to get listener address: %v", err)
}
systemNamespaces := []string{metav1.NamespaceSystem, metav1.NamespacePublic}
if utilfeature.DefaultFeatureGate.Enabled(features.NodeLease) {
systemNamespaces = append(systemNamespaces, corev1.NamespaceNodeLease)
}
return &Controller{
ServiceClient: serviceClient,
NamespaceClient: nsClient,
EventClient: eventClient,
EndpointReconciler: c.ExtraConfig.EndpointReconcilerConfig.Reconciler,
EndpointInterval: c.ExtraConfig.EndpointReconcilerConfig.Interval,
SystemNamespaces: systemNamespaces,
SystemNamespacesInterval: 1 * time.Minute,
ServiceClusterIPRegistry: legacyRESTStorage.ServiceClusterIPAllocator,
ServiceClusterIPRange: c.ExtraConfig.ServiceIPRange,
ServiceClusterIPInterval: 3 * time.Minute,
ServiceNodePortRegistry: legacyRESTStorage.ServiceNodePortAllocator,
ServiceNodePortRange: c.ExtraConfig.ServiceNodePortRange,
ServiceNodePortInterval: 3 * time.Minute,
PublicIP: c.GenericConfig.PublicAddress,
ServiceIP: c.ExtraConfig.APIServerServiceIP,
ServicePort: c.ExtraConfig.APIServerServicePort,
ExtraServicePorts: c.ExtraConfig.ExtraServicePorts,
ExtraEndpointPorts: c.ExtraConfig.ExtraEndpointPorts,
PublicServicePort: publicServicePort,
KubernetesServiceNodePort: c.ExtraConfig.KubernetesServiceNodePort,
}
}
func (c *Controller) PostStartHook(hookContext genericapiserver.PostStartHookContext) error {
c.Start()
return nil
}
func (c *Controller) PreShutdownHook() error {
c.Stop()
return nil
}
// Start begins the core controller loops that must exist for bootstrapping
// a cluster.
func (c *Controller) Start() {
if c.runner != nil {
return
}
repairClusterIPs := servicecontroller.NewRepair(c.ServiceClusterIPInterval, c.ServiceClient, c.EventClient, &c.ServiceClusterIPRange, c.ServiceClusterIPRegistry)
repairNodePorts := portallocatorcontroller.NewRepair(c.ServiceNodePortInterval, c.ServiceClient, c.EventClient, c.ServiceNodePortRange, c.ServiceNodePortRegistry)
// run all of the controllers once prior to returning from Start.
if err := repairClusterIPs.RunOnce(); err != nil {
// If we fail to repair cluster IPs apiserver is useless. We should restart and retry.
klog.Fatalf("Unable to perform initial IP allocation check: %v", err)
}
if err := repairNodePorts.RunOnce(); err != nil {
// If we fail to repair node ports apiserver is useless. We should restart and retry.
klog.Fatalf("Unable to perform initial service nodePort check: %v", err)
}
// Service definition is reconciled during first run to correct port and type per expectations.
if err := c.UpdateKubernetesService(true); err != nil {
klog.Errorf("Unable to perform initial Kubernetes service initialization: %v", err)
}
c.runner = async.NewRunner(c.RunKubernetesNamespaces, c.RunKubernetesService, repairClusterIPs.RunUntil, repairNodePorts.RunUntil)
c.runner.Start()
}
func (c *Controller) Stop() {
if c.runner != nil {
c.runner.Stop()
}
endpointPorts := createEndpointPortSpec(c.PublicServicePort, "https", c.ExtraEndpointPorts)
finishedReconciling := make(chan struct{})
go func() {
defer close(finishedReconciling)
klog.Infof("Shutting down kubernetes service endpoint reconciler")
if err := c.EndpointReconciler.StopReconciling(kubernetesServiceName, c.PublicIP, endpointPorts); err != nil {
klog.Error(err)
}
}()
select {
case <-finishedReconciling:
// done
case <-time.After(2 * c.EndpointInterval):
// don't block server shutdown forever if we can't reach etcd to remove ourselves
klog.Warning("StopReconciling() timed out")
}
}
// RunKubernetesNamespaces periodically makes sure that all internal namespaces exist
func (c *Controller) RunKubernetesNamespaces(ch chan struct{}) {
wait.Until(func() {
// Loop the system namespace list, and create them if they do not exist
for _, ns := range c.SystemNamespaces {
if err := createNamespaceIfNeeded(c.NamespaceClient, ns); err != nil {
runtime.HandleError(fmt.Errorf("unable to create required kubernetes system namespace %s: %v", ns, err))
}
}
}, c.SystemNamespacesInterval, ch)
}
// RunKubernetesService periodically updates the kubernetes service
func (c *Controller) RunKubernetesService(ch chan struct{}) {
wait.Until(func() {
// Service definition is not reconciled after first
// run, ports and type will be corrected only during
// start.
if err := c.UpdateKubernetesService(false); err != nil {
runtime.HandleError(fmt.Errorf("unable to sync kubernetes service: %v", err))
}
}, c.EndpointInterval, ch)
}
// UpdateKubernetesService attempts to update the default Kube service.
func (c *Controller) UpdateKubernetesService(reconcile bool) error {
// Update service & endpoint records.
// TODO: when it becomes possible to change this stuff,
// stop polling and start watching.
// TODO: add endpoints of all replicas, not just the elected master.
if err := createNamespaceIfNeeded(c.NamespaceClient, metav1.NamespaceDefault); err != nil {
return err
}
servicePorts, serviceType := createPortAndServiceSpec(c.ServicePort, c.PublicServicePort, c.KubernetesServiceNodePort, "https", c.ExtraServicePorts)
if err := c.CreateOrUpdateMasterServiceIfNeeded(kubernetesServiceName, c.ServiceIP, servicePorts, serviceType, reconcile); err != nil {
return err
}
endpointPorts := createEndpointPortSpec(c.PublicServicePort, "https", c.ExtraEndpointPorts)
if err := c.EndpointReconciler.ReconcileEndpoints(kubernetesServiceName, c.PublicIP, endpointPorts, reconcile); err != nil {
return err
}
return nil
}
// createPortAndServiceSpec creates an array of service ports.
// If the NodePort value is 0, just the servicePort is used, otherwise, a node port is exposed.
func createPortAndServiceSpec(servicePort int, targetServicePort int, nodePort int, servicePortName string, extraServicePorts []corev1.ServicePort) ([]corev1.ServicePort, corev1.ServiceType) {
//Use the Cluster IP type for the service port if NodePort isn't provided.
//Otherwise, we will be binding the master service to a NodePort.
servicePorts := []corev1.ServicePort{{Protocol: corev1.ProtocolTCP,
Port: int32(servicePort),
Name: servicePortName,
TargetPort: intstr.FromInt(targetServicePort)}}
serviceType := corev1.ServiceTypeClusterIP
if nodePort > 0 {
servicePorts[0].NodePort = int32(nodePort)
serviceType = corev1.ServiceTypeNodePort
}
if extraServicePorts != nil {
servicePorts = append(servicePorts, extraServicePorts...)
}
return servicePorts, serviceType
}
// createEndpointPortSpec creates an array of endpoint ports
func createEndpointPortSpec(endpointPort int, endpointPortName string, extraEndpointPorts []corev1.EndpointPort) []corev1.EndpointPort {
endpointPorts := []corev1.EndpointPort{{Protocol: corev1.ProtocolTCP,
Port: int32(endpointPort),
Name: endpointPortName,
}}
if extraEndpointPorts != nil {
endpointPorts = append(endpointPorts, extraEndpointPorts...)
}
return endpointPorts
}
// CreateMasterServiceIfNeeded will create the specified service if it
// doesn't already exist.
func (c *Controller) CreateOrUpdateMasterServiceIfNeeded(serviceName string, serviceIP net.IP, servicePorts []corev1.ServicePort, serviceType corev1.ServiceType, reconcile bool) error {
if s, err := c.ServiceClient.Services(metav1.NamespaceDefault).Get(serviceName, metav1.GetOptions{}); err == nil {
// The service already exists.
if reconcile {
if svc, updated := reconcilers.GetMasterServiceUpdateIfNeeded(s, servicePorts, serviceType); updated {
klog.Warningf("Resetting master service %q to %#v", serviceName, svc)
_, err := c.ServiceClient.Services(metav1.NamespaceDefault).Update(svc)
return err
}
}
return nil
}
svc := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: serviceName,
Namespace: metav1.NamespaceDefault,
Labels: map[string]string{"provider": "kubernetes", "component": "apiserver"},
},
Spec: corev1.ServiceSpec{
Ports: servicePorts,
// maintained by this code, not by the pod selector
Selector: nil,
ClusterIP: serviceIP.String(),
SessionAffinity: corev1.ServiceAffinityNone,
Type: serviceType,
},
}
_, err := c.ServiceClient.Services(metav1.NamespaceDefault).Create(svc)
if errors.IsAlreadyExists(err) {
return c.CreateOrUpdateMasterServiceIfNeeded(serviceName, serviceIP, servicePorts, serviceType, reconcile)
}
return err
}