-
Notifications
You must be signed in to change notification settings - Fork 7
/
member.go
401 lines (346 loc) · 12.8 KB
/
member.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
package etcd
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"go.etcd.io/etcd/clientv3"
"github.com/flexkube/libflexkube/internal/util"
"github.com/flexkube/libflexkube/pkg/container"
"github.com/flexkube/libflexkube/pkg/container/runtime/docker"
containertypes "github.com/flexkube/libflexkube/pkg/container/types"
"github.com/flexkube/libflexkube/pkg/host"
"github.com/flexkube/libflexkube/pkg/types"
)
// Member represents single etcd member.
type Member struct {
// Name defines the name of the etcd member. It is used for --name flag.
//
// Example values: etcd01, infra2, member3
//
// This field is optional if used with Cluster struct.
Name string `json:"name,omitempty"`
// Image is a Docker image with tag to use for member container.
//
// Example values: 'quay.io/coreos/etcd:v3.4.9'
//
// This field is optional if user together with Cluster struct.
Image string `json:"image,omitempty"`
// Host describes on which machine member container should be created.
//
// This field is required.
Host host.Host `json:"host,omitempty"`
// CACertificate is a etcd CA X.509 certificate used to verify peers and client
// certificates. It is used for --peer-trusted-ca-file and --trusted-ca-file flags.
//
// This certificate can be generated using pki.PKI struct.
//
// This field is optional, if used together with Cluster struct.
CACertificate types.Certificate `json:"caCertificate,omitempty"`
// PeerCertificate is a X.509 certificate used to communicate with other cluster
// members. Should be signed by CACertificate. It is used for --peer-cert-file flag.
//
// This certificate can be generated using pki.PKI struct.
//
// This field is optional, if used together with Cluster struct and PKI integration.
PeerCertificate types.Certificate `json:"peerCertificate,omitempty"`
// PeerKey is a private key for PeerCertificate. Must be defined in either
// PKCS8, PKCS1 or EC formats, PEM encoded. It is used for --peer-key-file flag.
//
// This private key can be generated using pki.PKI struct.
//
// This field is optional, if used together with Cluster struct and PKI integration.
PeerKey types.PrivateKey `json:"peerKey,omitempty"`
// PeerAddress is an address, where member will listen and which will be
// advertised to the cluster. It is used for --listen-peer-urls and
// --initial-advertise-peer-urls flags.
//
// Example value: 192.168.10.10
PeerAddress string `json:"peerAddress,omitempty"`
// InitialCluster defines initial list of members for the cluster. It is used for
// --initial-cluster flag.
//
// Example value: 'infra0=http://10.0.1.10:2380,infra1=http://10.0.1.11:2380'.
//
// This field is optional, if used together with Cluster struct.
InitialCluster string `json:"initialCluster,omitempty"`
// PeerCertAllowedCN defines allowed CommonName of the client certificate
// for peer communication. Can be used when single client certificate is used
// for all members of the cluster.
//
// Is is used for --peer-cert-allowed-cn flag.
//
// Example value: 'member'.
//
// This field is optional.
PeerCertAllowedCN string `json:"peerCertAllowedCN,omitempty"`
// ServerCertificate is a X.509 certificate used to communicate with other cluster
// members. Should be signed by CACertificate. It is used for --peer-cert-file flag.
//
//
// This certificate can be generated using pki.PKI struct.
//
// This field is optional, if used together with Cluster struct and PKI integration.
ServerCertificate types.Certificate `json:"serverCertificate,omitempty"`
// Serverkey is a private key for ServerCertificate. Must be defined in either
// PKCS8, PKCS1 or EC formats, PEM encoded. It is used for --peer-key-file flag.
//
// This private key can be generated using pki.PKI struct.
//
// This field is optional, if used together with Cluster struct and PKI integration.
ServerKey types.PrivateKey `json:"serverKey,omitempty"`
// ServerAddress is an address, where member will listen and which will be
// advertised to the clients. It is used for --listen-client-urls and
// --advertise-client-urls flags.
//
// Example value: 192.168.10.10
ServerAddress string `json:"serverAddress,omitempty"`
// NewCluster controls if member should be created as part of new cluster or as part
// of already initialized cluster.
//
// If set to true, --initial-cluster-token flag will be used when creating the container,
// otherwise --initial-cluster-state=existing flag will be used.
//
// This field is optional, if used together with Cluster struct.
NewCluster bool `json:"newCluster,omitempty"`
}
// member is a validated, executable version of Member.
type member struct {
name string
image string
host host.Host
caCertificate string
peerCertificate string
peerKey string
peerAddress string
initialCluster string
peerCertAllowedCN string
serverCertificate string
serverKey string
serverAddress string
newCluster bool
}
func (m *member) configFiles() map[string]string {
return map[string]string{
"/etc/kubernetes/etcd/ca.crt": m.caCertificate,
"/etc/kubernetes/etcd/peer.crt": m.peerCertificate,
"/etc/kubernetes/etcd/peer.key": m.peerKey,
"/etc/kubernetes/etcd/server.crt": m.serverCertificate,
"/etc/kubernetes/etcd/server.key": m.serverKey,
}
}
// args returns flags which will be set to the container.
func (m *member) args() []string {
flags := []string{
// TODO Add descriptions explaining why we need each line.
// Default value 'capnslog' for logger is deprecated and prints warning now.
"--logger=zap", // Available only from 3.4.x
// Since we are in container, listen on all interfaces.
fmt.Sprintf("--listen-client-urls=https://%s:2379", m.serverAddress),
fmt.Sprintf("--listen-peer-urls=https://%s:2380", m.peerAddress),
fmt.Sprintf("--advertise-client-urls=https://%s:2379", m.serverAddress),
fmt.Sprintf("--initial-advertise-peer-urls=https://%s:2380", m.peerAddress),
fmt.Sprintf("--initial-cluster=%s", m.initialCluster),
fmt.Sprintf("--name=%s", m.name),
"--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt",
"--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt",
"--peer-key-file=/etc/kubernetes/pki/etcd/peer.key",
"--peer-client-cert-auth",
"--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt",
"--cert-file=/etc/kubernetes/pki/etcd/server.crt",
"--key-file=/etc/kubernetes/pki/etcd/server.key",
fmt.Sprintf("--data-dir=/%s.etcd", m.name),
// To get rid of warning with default configuration.
// ttl parameter support has been added in 3.4.x.
"--auth-token=jwt,pub-key=/etc/kubernetes/pki/etcd/peer.crt,priv-key=/etc/kubernetes/pki/etcd/peer.key,sign-method=RS512,ttl=10m",
// This is set by typhoon, seems like extra safety knob.
"--strict-reconfig-check",
// TODO: Enable metrics.
// Enable TLS authentication with certificate CN field.
// See https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/authentication.md#using-tls-common-name
// for more details.
"--client-cert-auth=true",
}
if m.peerCertAllowedCN != "" {
flags = append(flags, fmt.Sprintf("--peer-cert-allowed-cn=%s", m.peerCertAllowedCN))
}
return flags
}
// ToHostConfiguredContainer takes configured member and converts it to generic HostConfiguredContainer.
func (m *member) ToHostConfiguredContainer() (*container.HostConfiguredContainer, error) {
c := container.Container{
// TODO: This is weird. This sets docker as default runtime config.
Runtime: container.RuntimeConfig{
Docker: docker.DefaultConfig(),
},
Config: containertypes.ContainerConfig{
Name: fmt.Sprintf("etcd-%s", m.name),
Image: m.image,
Entrypoint: []string{"/usr/local/bin/etcd"},
Mounts: []containertypes.Mount{
{
// TODO: Between /var/lib/etcd and data dir we should probably put cluster name, to group them.
// TODO: Make data dir configurable.
Source: fmt.Sprintf("/var/lib/etcd/%s.etcd/", m.name),
Target: fmt.Sprintf("/%s.etcd", m.name),
},
{
Source: "/etc/kubernetes/etcd/",
Target: "/etc/kubernetes/pki/etcd",
},
},
NetworkMode: "host",
Args: m.args(),
},
}
if m.newCluster {
c.Config.Args = append(c.Config.Args, "--initial-cluster-token=etcd-cluster-2")
} else {
c.Config.Args = append(c.Config.Args, "--initial-cluster-state=existing")
}
return &container.HostConfiguredContainer{
Host: m.host,
ConfigFiles: m.configFiles(),
Container: c,
}, nil
}
// New validates Member configuration and returns it's usable version.
func (m *Member) New() (container.ResourceInstance, error) {
if err := m.Validate(); err != nil {
return nil, fmt.Errorf("failed to validate member configuration: %w", err)
}
nm := &member{
name: m.Name,
image: m.Image,
host: m.Host,
caCertificate: string(m.CACertificate),
peerCertificate: string(m.PeerCertificate),
peerKey: string(m.PeerKey),
peerAddress: m.PeerAddress,
initialCluster: m.InitialCluster,
peerCertAllowedCN: m.PeerCertAllowedCN,
serverCertificate: string(m.ServerCertificate),
serverKey: string(m.ServerKey),
serverAddress: m.ServerAddress,
newCluster: m.NewCluster,
}
return nm, nil
}
// Validate validates etcd member configuration.
//
// TODO: Add validation of certificates if specified.
func (m *Member) Validate() error {
var errors util.ValidateError
nonEmptyFields := map[string]string{
// TODO: Require peer address for now. Later we could figure out
// how to use CNI for setting it using env variables or something.
"peer address": m.PeerAddress,
// TODO: Can we auto-generate it?
"member name": m.Name,
"CA certificate": string(m.CACertificate),
"peer certificate": string(m.PeerCertificate),
"peer key": string(m.PeerKey),
"server certificate": string(m.ServerCertificate),
"server key": string(m.ServerKey),
}
for k, v := range nonEmptyFields {
if v == "" {
errors = append(errors, fmt.Errorf("%s can't be empty", k))
}
}
if err := m.Host.Validate(); err != nil {
errors = append(errors, fmt.Errorf("host validation failed: %w", err))
}
return errors.Return()
}
func (m *member) peerURLs() []string {
return []string{fmt.Sprintf("https://%s:2380", m.peerAddress)}
}
// forwardEndpoints opens forwarding connection for each endpoint
// and then returns new list of endpoints. If forwarding fails, error is returned.
func (m *member) forwardEndpoints(endpoints []string) ([]string, error) {
newEndpoints := []string{}
h, _ := m.host.New()
hc, err := h.Connect()
if err != nil {
return nil, fmt.Errorf("failed opening forwarding connection to host: %w", err)
}
for _, e := range endpoints {
e, err := hc.ForwardTCP(e)
if err != nil {
return nil, fmt.Errorf("failed opening forwarding to member: %w", err)
}
newEndpoints = append(newEndpoints, fmt.Sprintf("https://%s", e))
}
return newEndpoints, nil
}
func (m *member) getID(cli etcdClient) (uint64, error) {
// Get actual list of members.
resp, err := cli.MemberList(context.Background())
if err != nil {
return 0, fmt.Errorf("failed to list existing cluster members: %w", err)
}
for _, v := range resp.Members {
if v.Name == m.name {
return v.ID, nil
}
for _, p := range v.PeerURLs {
for _, u := range m.peerURLs() {
if p == u {
return v.ID, nil
}
}
}
}
return 0, nil
}
func (m *member) getEtcdClient(endpoints []string) (etcdClient, error) {
cert, _ := tls.X509KeyPair([]byte(m.peerCertificate), []byte(m.peerKey))
der, _ := pem.Decode([]byte(m.caCertificate))
ca, _ := x509.ParseCertificate(der.Bytes)
p := x509.NewCertPool()
p.AddCert(ca)
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: defaultDialTimeout,
DialKeepAliveTimeout: defaultDialTimeout,
TLS: &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: p,
MinVersion: tls.VersionTLS12,
},
})
if err != nil {
return nil, fmt.Errorf("failed creating etcd client: %w", err)
}
return cli, nil
}
func (m *member) add(cli etcdClient) error {
id, err := m.getID(cli)
if err != nil {
return fmt.Errorf("failed getting member ID: %w", err)
}
// If no error is returned, and ID is 0, it means member is already returned.
if id != 0 {
return nil
}
if _, err := cli.MemberAdd(context.Background(), m.peerURLs()); err != nil {
return fmt.Errorf("failed adding new member to the cluster: %w", err)
}
return nil
}
func (m *member) remove(cli etcdClient) error {
id, err := m.getID(cli)
if err != nil {
return fmt.Errorf("failed getting member ID: %w", err)
}
// If no error is returned, and ID is 0, it means member is already returned.
if id == 0 {
return nil
}
if _, err = cli.MemberRemove(context.Background(), id); err != nil {
return fmt.Errorf("failed removing member: %w", err)
}
return nil
}