forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
398 lines (360 loc) · 17.5 KB
/
server.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
/*
Copyright 2014 Google Inc. All rights reserved.
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 app does all of the work necessary to create a Kubernetes
// APIServer by binding together the API, master and APIServer infrastructure.
// It can be configured and called directly or via the hyperkube framework.
package app
import (
"crypto/tls"
"net"
"net/http"
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/GoogleCloudPlatform/kubernetes/pkg/admission"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
"github.com/GoogleCloudPlatform/kubernetes/pkg/capabilities"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
"github.com/GoogleCloudPlatform/kubernetes/pkg/master"
"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/coreos/go-etcd/etcd"
"github.com/golang/glog"
"github.com/spf13/pflag"
)
// APIServer runs a kubernetes api server.
type APIServer struct {
InsecureBindAddress util.IP
InsecurePort int
BindAddress util.IP
ReadOnlyPort int
SecurePort int
ExternalHost string
APIRate float32
APIBurst int
TLSCertFile string
TLSPrivateKeyFile string
APIPrefix string
StorageVersion string
CloudProvider string
CloudConfigFile string
EventTTL time.Duration
ClientCAFile string
TokenAuthFile string
AuthorizationMode string
AuthorizationPolicyFile string
AdmissionControl string
AdmissionControlConfigFile string
EtcdServerList util.StringList
EtcdConfigFile string
CorsAllowedOriginList util.StringList
AllowPrivileged bool
PortalNet util.IPNet // TODO: make this a list
EnableLogsSupport bool
MasterServiceNamespace string
RuntimeConfig util.ConfigurationMap
KubeletConfig client.KubeletConfig
ClusterName string
EnableProfiling bool
MaxRequestsInFlight int
LongRunningRequestRE string
}
// NewAPIServer creates a new APIServer object with default parameters
func NewAPIServer() *APIServer {
s := APIServer{
InsecurePort: 8080,
InsecureBindAddress: util.IP(net.ParseIP("127.0.0.1")),
BindAddress: util.IP(net.ParseIP("0.0.0.0")),
ReadOnlyPort: 7080,
SecurePort: 6443,
APIRate: 10.0,
APIBurst: 200,
APIPrefix: "/api",
EventTTL: 1 * time.Hour,
AuthorizationMode: "AlwaysAllow",
AdmissionControl: "AlwaysAdmit",
EnableLogsSupport: true,
MasterServiceNamespace: api.NamespaceDefault,
ClusterName: "kubernetes",
RuntimeConfig: make(util.ConfigurationMap),
KubeletConfig: client.KubeletConfig{
Port: 10250,
EnableHttps: true,
HTTPTimeout: time.Duration(5) * time.Second,
},
}
return &s
}
// AddFlags adds flags for a specific APIServer to the specified FlagSet
func (s *APIServer) AddFlags(fs *pflag.FlagSet) {
// Note: the weird ""+ in below lines seems to be the only way to get gofmt to
// arrange these text blocks sensibly. Grrr.
fs.IntVar(&s.InsecurePort, "insecure_port", s.InsecurePort, ""+
"The port on which to serve unsecured, unauthenticated access. Default 8080. It is assumed "+
"that firewall rules are set up such that this port is not reachable from outside of "+
"the cluster and that port 443 on the cluster's public address is proxied to this "+
"port. This is performed by nginx in the default setup.")
fs.IntVar(&s.InsecurePort, "port", s.InsecurePort, "DEPRECATED: see --insecure_port instead")
fs.Var(&s.InsecureBindAddress, "insecure_bind_address", ""+
"The IP address on which to serve the --insecure_port (set to 0.0.0.0 for all interfaces). "+
"Defaults to localhost.")
fs.Var(&s.InsecureBindAddress, "address", "DEPRECATED: see --insecure_bind_address instead")
fs.Var(&s.BindAddress, "bind_address", ""+
"The IP address on which to serve the --read_only_port and --secure_port ports. This "+
"address must be reachable by the rest of the cluster. If blank, all interfaces will be used.")
fs.Var(&s.BindAddress, "public_address_override", "DEPRECATED: see --bind_address instead")
fs.IntVar(&s.ReadOnlyPort, "read_only_port", s.ReadOnlyPort, ""+
"The port on which to serve read-only resources. If 0, don't serve read-only "+
"at all. It is assumed that firewall rules are set up such that this port is "+
"not reachable from outside of the cluster.")
fs.IntVar(&s.SecurePort, "secure_port", s.SecurePort, ""+
"The port on which to serve HTTPS with authentication and authorization. If 0, "+
"don't serve HTTPS at all.")
fs.Float32Var(&s.APIRate, "api_rate", s.APIRate, "API rate limit as QPS for the read only port")
fs.IntVar(&s.APIBurst, "api_burst", s.APIBurst, "API burst amount for the read only port")
fs.StringVar(&s.TLSCertFile, "tls_cert_file", s.TLSCertFile, ""+
"File containing x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). "+
"If HTTPS serving is enabled, and --tls_cert_file and --tls_private_key_file are not provided, "+
"a self-signed certificate and key are generated for the public address and saved to /var/run/kubernetes.")
fs.StringVar(&s.TLSPrivateKeyFile, "tls_private_key_file", s.TLSPrivateKeyFile, "File containing x509 private key matching --tls_cert_file.")
fs.StringVar(&s.APIPrefix, "api_prefix", s.APIPrefix, "The prefix for API requests on the server. Default '/api'.")
fs.StringVar(&s.StorageVersion, "storage_version", s.StorageVersion, "The version to store resources with. Defaults to server preferred")
fs.StringVar(&s.CloudProvider, "cloud_provider", s.CloudProvider, "The provider for cloud services. Empty string for no provider.")
fs.StringVar(&s.CloudConfigFile, "cloud_config", s.CloudConfigFile, "The path to the cloud provider configuration file. Empty string for no configuration file.")
fs.DurationVar(&s.EventTTL, "event_ttl", s.EventTTL, "Amount of time to retain events. Default 1 hour.")
fs.StringVar(&s.ClientCAFile, "client_ca_file", s.ClientCAFile, "If set, any request presenting a client certificate signed by one of the authorities in the client_ca_file is authenticated with an identity corresponding to the CommonName of the client certificate.")
fs.StringVar(&s.TokenAuthFile, "token_auth_file", s.TokenAuthFile, "If set, the file that will be used to secure the secure port of the API server via token authentication.")
fs.StringVar(&s.AuthorizationMode, "authorization_mode", s.AuthorizationMode, "Selects how to do authorization on the secure port. One of: "+strings.Join(apiserver.AuthorizationModeChoices, ","))
fs.StringVar(&s.AuthorizationPolicyFile, "authorization_policy_file", s.AuthorizationPolicyFile, "File with authorization policy in csv format, used with --authorization_mode=ABAC, on the secure port.")
fs.StringVar(&s.AdmissionControl, "admission_control", s.AdmissionControl, "Ordered list of plug-ins to do admission control of resources into cluster. Comma-delimited list of: "+strings.Join(admission.GetPlugins(), ", "))
fs.StringVar(&s.AdmissionControlConfigFile, "admission_control_config_file", s.AdmissionControlConfigFile, "File with admission control configuration.")
fs.Var(&s.EtcdServerList, "etcd_servers", "List of etcd servers to watch (http://ip:port), comma separated. Mutually exclusive with -etcd_config")
fs.StringVar(&s.EtcdConfigFile, "etcd_config", s.EtcdConfigFile, "The config file for the etcd client. Mutually exclusive with -etcd_servers.")
fs.Var(&s.CorsAllowedOriginList, "cors_allowed_origins", "List of allowed origins for CORS, comma separated. An allowed origin can be a regular expression to support subdomain matching. If this list is empty CORS will not be enabled.")
fs.BoolVar(&s.AllowPrivileged, "allow_privileged", s.AllowPrivileged, "If true, allow privileged containers.")
fs.Var(&s.PortalNet, "portal_net", "A CIDR notation IP range from which to assign portal IPs. This must not overlap with any IP ranges assigned to nodes for pods.")
fs.StringVar(&s.MasterServiceNamespace, "master_service_namespace", s.MasterServiceNamespace, "The namespace from which the kubernetes master services should be injected into pods")
fs.Var(&s.RuntimeConfig, "runtime_config", "A set of key=value pairs that describe runtime configuration that may be passed to the apiserver.")
client.BindKubeletClientConfigFlags(fs, &s.KubeletConfig)
fs.StringVar(&s.ClusterName, "cluster_name", s.ClusterName, "The instance prefix for the cluster")
fs.BoolVar(&s.EnableProfiling, "profiling", true, "Enable profiling via web interface host:port/debug/pprof/")
fs.StringVar(&s.ExternalHost, "external_hostname", "", "The hostname to use when generating externalized URLs for this master (e.g. Swagger API Docs.)")
fs.IntVar(&s.MaxRequestsInFlight, "max_requests_inflight", 400, "The maximum number of requests in flight at a given time. When the server exceeds this, it rejects requests. Zero for no limit.")
fs.StringVar(&s.LongRunningRequestRE, "long_running_request_regexp", "[.*\\/watch$][^\\/proxy.*]", "A regular expression matching long running requests which should be excluded from maximum inflight request handling.")
}
// TODO: Longer term we should read this from some config store, rather than a flag.
func (s *APIServer) verifyPortalFlags() {
if s.PortalNet.IP == nil {
glog.Fatal("No --portal_net specified")
}
}
func newEtcd(etcdConfigFile string, etcdServerList util.StringList, storageVersion string) (helper tools.EtcdHelper, err error) {
var client tools.EtcdGetSet
if etcdConfigFile != "" {
client, err = etcd.NewClientFromFile(etcdConfigFile)
if err != nil {
return helper, err
}
} else {
client = etcd.NewClient(etcdServerList)
}
return master.NewEtcdHelper(client, storageVersion)
}
// Run runs the specified APIServer. This should never exit.
func (s *APIServer) Run(_ []string) error {
s.verifyPortalFlags()
if (s.EtcdConfigFile != "" && len(s.EtcdServerList) != 0) || (s.EtcdConfigFile == "" && len(s.EtcdServerList) == 0) {
glog.Fatalf("specify either --etcd_servers or --etcd_config")
}
capabilities.Initialize(capabilities.Capabilities{
AllowPrivileged: s.AllowPrivileged,
// TODO(vmarmol): Implement support for HostNetworkSources.
HostNetworkSources: []string{},
})
cloud := cloudprovider.InitCloudProvider(s.CloudProvider, s.CloudConfigFile)
kubeletClient, err := client.NewKubeletClient(&s.KubeletConfig)
if err != nil {
glog.Fatalf("Failure to start kubelet client: %v", err)
}
disableV1beta3 := false
v1beta3FlagValue, ok := s.RuntimeConfig["api/v1beta3"]
if ok && v1beta3FlagValue == "false" {
disableV1beta3 = true
}
// TODO: expose same flags as client.BindClientConfigFlags but for a server
clientConfig := &client.Config{
Host: net.JoinHostPort(s.InsecureBindAddress.String(), strconv.Itoa(s.InsecurePort)),
Version: s.StorageVersion,
}
client, err := client.New(clientConfig)
if err != nil {
glog.Fatalf("Invalid server address: %v", err)
}
helper, err := newEtcd(s.EtcdConfigFile, s.EtcdServerList, s.StorageVersion)
if err != nil {
glog.Fatalf("Invalid storage version or misconfigured etcd: %v", err)
}
n := net.IPNet(s.PortalNet)
authenticator, err := apiserver.NewAuthenticator(s.ClientCAFile, s.TokenAuthFile)
if err != nil {
glog.Fatalf("Invalid Authentication Config: %v", err)
}
authorizer, err := apiserver.NewAuthorizerFromAuthorizationConfig(s.AuthorizationMode, s.AuthorizationPolicyFile)
if err != nil {
glog.Fatalf("Invalid Authorization Config: %v", err)
}
admissionControlPluginNames := strings.Split(s.AdmissionControl, ",")
admissionController := admission.NewFromPlugins(client, admissionControlPluginNames, s.AdmissionControlConfigFile)
if len(s.ExternalHost) == 0 {
// TODO: extend for other providers
if s.CloudProvider == "gce" {
instances, supported := cloud.Instances()
if !supported {
glog.Fatalf("gce cloud provider has no instances. this shouldn't happen. exiting.")
}
name, err := os.Hostname()
if err != nil {
glog.Fatalf("failed to get hostname: %v", err)
}
addrs, err := instances.NodeAddresses(name)
if err != nil {
glog.Warningf("unable to obtain external host address from cloud provider: %v", err)
} else {
for _, addr := range addrs {
if addr.Type == api.NodeExternalIP {
s.ExternalHost = addr.Address
}
}
}
}
}
config := &master.Config{
Cloud: cloud,
EtcdHelper: helper,
EventTTL: s.EventTTL,
KubeletClient: kubeletClient,
PortalNet: &n,
EnableLogsSupport: s.EnableLogsSupport,
EnableUISupport: true,
EnableSwaggerSupport: true,
EnableProfiling: s.EnableProfiling,
EnableIndex: true,
APIPrefix: s.APIPrefix,
CorsAllowedOriginList: s.CorsAllowedOriginList,
ReadOnlyPort: s.ReadOnlyPort,
ReadWritePort: s.SecurePort,
PublicAddress: net.IP(s.BindAddress),
Authenticator: authenticator,
Authorizer: authorizer,
AdmissionControl: admissionController,
DisableV1Beta3: disableV1beta3,
MasterServiceNamespace: s.MasterServiceNamespace,
ClusterName: s.ClusterName,
ExternalHost: s.ExternalHost,
}
m := master.New(config)
// We serve on 3 ports. See docs/accessing_the_api.md
roLocation := ""
if s.ReadOnlyPort != 0 {
roLocation = net.JoinHostPort(s.BindAddress.String(), strconv.Itoa(s.ReadOnlyPort))
}
secureLocation := ""
if s.SecurePort != 0 {
secureLocation = net.JoinHostPort(s.BindAddress.String(), strconv.Itoa(s.SecurePort))
}
insecureLocation := net.JoinHostPort(s.InsecureBindAddress.String(), strconv.Itoa(s.InsecurePort))
// See the flag commentary to understand our assumptions when opening the read-only and read-write ports.
var sem chan bool
if s.MaxRequestsInFlight > 0 {
sem = make(chan bool, s.MaxRequestsInFlight)
}
longRunningRE := regexp.MustCompile(s.LongRunningRequestRE)
if roLocation != "" {
// Default settings allow 1 read-only request per second, allow up to 20 in a burst before enforcing.
rl := util.NewTokenBucketRateLimiter(s.APIRate, s.APIBurst)
readOnlyServer := &http.Server{
Addr: roLocation,
Handler: apiserver.MaxInFlightLimit(sem, longRunningRE, apiserver.RecoverPanics(apiserver.ReadOnly(apiserver.RateLimit(rl, m.InsecureHandler)))),
ReadTimeout: 5 * time.Minute,
WriteTimeout: 5 * time.Minute,
MaxHeaderBytes: 1 << 20,
}
glog.Infof("Serving read-only insecurely on %s", roLocation)
go func() {
defer util.HandleCrash()
for {
if err := readOnlyServer.ListenAndServe(); err != nil {
glog.Errorf("Unable to listen for read only traffic (%v); will try again.", err)
}
time.Sleep(15 * time.Second)
}
}()
}
if secureLocation != "" {
secureServer := &http.Server{
Addr: secureLocation,
Handler: apiserver.MaxInFlightLimit(sem, longRunningRE, apiserver.RecoverPanics(m.Handler)),
ReadTimeout: 5 * time.Minute,
WriteTimeout: 5 * time.Minute,
MaxHeaderBytes: 1 << 20,
TLSConfig: &tls.Config{
// Change default from SSLv3 to TLSv1.0 (because of POODLE vulnerability)
MinVersion: tls.VersionTLS10,
},
}
if len(s.ClientCAFile) > 0 {
clientCAs, err := util.CertPoolFromFile(s.ClientCAFile)
if err != nil {
glog.Fatalf("unable to load client CA file: %v", err)
}
// Populate PeerCertificates in requests, but don't reject connections without certificates
// This allows certificates to be validated by authenticators, while still allowing other auth types
secureServer.TLSConfig.ClientAuth = tls.RequestClientCert
// Specify allowed CAs for client certificates
secureServer.TLSConfig.ClientCAs = clientCAs
}
glog.Infof("Serving securely on %s", secureLocation)
go func() {
defer util.HandleCrash()
for {
if s.TLSCertFile == "" && s.TLSPrivateKeyFile == "" {
s.TLSCertFile = "/var/run/kubernetes/apiserver.crt"
s.TLSPrivateKeyFile = "/var/run/kubernetes/apiserver.key"
if err := util.GenerateSelfSignedCert(config.PublicAddress.String(), s.TLSCertFile, s.TLSPrivateKeyFile); err != nil {
glog.Errorf("Unable to generate self signed cert: %v", err)
} else {
glog.Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile)
}
}
if err := secureServer.ListenAndServeTLS(s.TLSCertFile, s.TLSPrivateKeyFile); err != nil {
glog.Errorf("Unable to listen for secure (%v); will try again.", err)
}
time.Sleep(15 * time.Second)
}
}()
}
http := &http.Server{
Addr: insecureLocation,
Handler: apiserver.RecoverPanics(m.InsecureHandler),
ReadTimeout: 5 * time.Minute,
WriteTimeout: 5 * time.Minute,
MaxHeaderBytes: 1 << 20,
}
glog.Infof("Serving insecurely on %s", insecureLocation)
glog.Fatal(http.ListenAndServe())
return nil
}