Mesh Demo Tutorial

1. 概览

2. 变更发布

3. 分布式高可用架构

4. 安全隔离

5. 结语

3.5.2 地域感知

图3-5-2-1-地域感知

背景：业务规模增长，为提高网站可用性，电商网站业务团队计划在另一可用区的集群也部署一套网站业务，两套相同的网站业务在两个不同集群同时为用户提供服务。

两套网站业务在正常运行的情况下，ingress gateway会优先将流量路由至本地域或可用区的frontend服务，即使另一集群中也有frontend服务；frontend服务会优先就近访问相同可用区user，product，order，cart服务；order和cart服务也会优先就近访问相同可用区的stock服务。

首先将网站全套服务也部署至另一可用区的集群（子集群）：

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
kubectl apply -f - <<EOF
apiVersion: v1
kind: Namespace
metadata:
  name: base
  labels:
    istio.io/rev: 1-6-9
spec:
  finalizers:
    - kubernetes
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
  namespace: base
  labels:
    app: frontend
spec:
  replicas: 1
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
        - name: frontend
          image: ccr.ccs.tencentyun.com/chloeyhuang/demo:v202007101540
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 80
---

apiVersion: v1
kind: Service
metadata:
  name: frontend
  namespace: base
  labels:
    app: frontend
spec:
  ports:
    - port: 80
      name: http
  selector:
    app: frontend
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: product-v1
  namespace: base
  labels:
    app: product
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: product
      version: v1
  template:
    metadata:
      labels:
        app: product
        version: v1
    spec:
      containers:
        - name: product
          image: ccr.ccs.tencentyun.com/zhulei/testproduct1:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: product-v2
  namespace: base
  labels:
    app: product
    version: v2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: product
      version: v2
  template:
    metadata:
      labels:
        app: product
        version: v2
    spec:
      containers:
        - name: product
          image: ccr.ccs.tencentyun.com/zhulei/testproduct2:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
---

apiVersion: v1
kind: Service
metadata:
  name: product
  namespace: base
  labels:
    app: product
spec:
  ports:
    - port: 7000
      name: http
  selector:
    app: product
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: user
  namespace: base
  labels:
    app: user
spec:
  replicas: 1
  selector:
    matchLabels:
      app: user
  template:
    metadata:
      labels:
        app: user
    spec:
      containers:
        - name: user
          image: ccr.ccs.tencentyun.com/zhulei/testuser:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
---

apiVersion: v1
kind: Service
metadata:
  name: user
  namespace: base
  labels:
    app: user
spec:
  ports:
    - port: 7000
      name: http
  selector:
    app: user
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: stock
  namespace: base
  labels:
    app: stock
spec:
  replicas: 1
  selector:
    matchLabels:
      app: stock
  template:
    metadata:
      labels:
        app: stock
    spec:
      containers:
        - name: stock
          image: ccr.ccs.tencentyun.com/zhulei/teststock:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
---

apiVersion: v1
kind: Service
metadata:
  name: stock
  namespace: base
  labels:
    app: stock
spec:
  ports:
    - port: 7000
      name: http
  selector:
    app: stock
---


apiVersion: apps/v1
kind: Deployment
metadata:
  name: cart
  namespace: base
  labels:
    app: cart
spec:
  replicas: 3
  selector:
    matchLabels:
      app: cart
  template:
    metadata:
      labels:
        app: cart
    spec:
      containers:
        - name: cart
          image: ccr.ccs.tencentyun.com/zhulei/testcart:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
              protocol: TCP
---

apiVersion: v1
kind: Service
metadata:
  name: cart
  namespace: base
  labels:
    app: cart
spec:
  ports:
    - name: http
      port: 7000
      protocol: TCP
  selector:
    app: cart
  type: ClusterIP
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: order-v1
  namespace: base
  labels:
    app: order
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: order
      version: v1
  template:
    metadata:
      labels:
        app: order
        version: v1
    spec:
      containers:
        - name: order
          image: ccr.ccs.tencentyun.com/zhulei/testorder1:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
              protocol: TCP
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: order-v2
  namespace: base
  labels:
    app: order
    version: v2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: order
      version: v2
  template:
    metadata:
      labels:
        app: order
        version: v2
    spec:
      containers:
        - name: order
          image: ccr.ccs.tencentyun.com/zhulei/testorder2:v1
          imagePullPolicy: Always
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: REGION
              value: "guangzhou-zoneB"
          ports:
            - containerPort: 7000
              protocol: TCP
---

apiVersion: v1
kind: Service
metadata:
  name: order
  namespace: base
  labels:
    app: order
spec:
  ports:
    - name: http
      port: 7000
      protocol: TCP
  selector:
    app: order
  type: ClusterIP
EOF

部署配置完成后，未配置健康检查时，地域感知不生效，两个可用区的某一服务调用另外的服务是随机访问，不会按照就近访问的原则。

图3-5-2-2-order服务调用不同可用区的stock服务

要开启服务访问的地域感知，需要配置所有服务的健康检查功能，通过将以下yaml文件提交至主集群实现：

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
kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: cart
  namespace: base
spec:
  host: cart
  trafficPolicy:
    loadBalancer:
      consistentHash:
        httpHeaderName: UserID
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  exportTo:
    - '*'

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: frontend
  namespace: base
spec:
  host: frontend
  trafficPolicy:
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  exportTo:
    - '*'

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: order
  namespace: base
spec:
  host: order
  trafficPolicy:
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  subsets:
    - name: v1
      labels:
        version: v1
    - name: v2
      labels:
        version: v2
  exportTo:
    - '*'

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: product
  namespace: base
spec:
  host: product
  trafficPolicy:
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  subsets:
    - name: v1
      labels:
        version: v1
    - name: v2
      labels:
        version: v2

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: stock
  namespace: base
spec:
  host: stock
  trafficPolicy:
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  exportTo:
    - '*'

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: user
  namespace: base
spec:
  host: user
  trafficPolicy:
    outlierDetection:
      consecutiveErrors: 5
      interval: 10000ms
      baseEjectionTime: 30000ms
      maxEjectionPercent: 10
      minHealthPercent: 50
  exportTo:
    - '*'
EOF

健康检查配置完成后，由可用区A集群的边缘代理网关访问网站服务，浏览商品页面，添加购物车，下单等操作，可用区A的边缘代理网关会将流量路由至相同可用区的前端frontend服务，前端服务也会地域感知就近调用同一可用区的user、cart、order、stock服务；通过可用区B的边缘代理网关访问网站业务，请求路由至可用区B的前端服务，可用区B服务也会就近调用相同可用区的服务。通过Demo页面左下角悬浮窗可以查看当前调用服务的可用区信息。

图3-5-2-3-地域感知