istio断路器示例

此任务阐述如何为连接，请求和异常检测（outlier detection）配置断路器。断路器是创建弹性微服务应用程序的重要模式。断路器使应用程序可以适应网络故障和延迟尖峰等网络不良影响。在此任务中，将配置断路规则，然后通过有意地“跳闸”来测试断路器配置。

1    环境准备

通过执行下面的命令，启动httpbin示例：

$ kubectl apply -f samples/httpbin/httpbin.yaml

httpbin.yaml的代码内容如下：

apiVersion: v1
kind: Service
metadata:
  name: httpbin
  labels:
    app: httpbin
spec:
  ports:
  - name: http
    port: 8000
    targetPort: 80
  selector:
    app: httpbin
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpbin
spec:
  replicas: 1
  selector:
    matchLabels:
      app: httpbin
      version: v1
  template:
    metadata:
      labels:
        app: httpbin
        version: v1
    spec:
      containers:
      - image: docker.io/kennethreitz/httpbin
        imagePullPolicy: IfNotPresent
        name: httpbin
        ports:
        - containerPort: 80

该httpbin应用程序充当此任务的后端服务。

2    配置断路器

创建一个目标规则，以在调用httpbin服务时应用断路器设置：

$ kubectl apply -f -  Parsed non ok code 503 (HTTP/1.1 503)

Ended after 106.474079ms : 20 calls. qps=187.84
Aggregated Function Time : count 20 avg 0.010215375 +/- 0.003604 min 0.005172024 max 0.019434859 sum 0.204307492
# range, mid point, percentile, count
>= 0.00517202  0.006  0.007  0.008  0.009  0.01  0.011  0.012  0.016  0.018 2 procs, for 5s: http://httpbin:8000/get
Starting at max qps with 3 thread(s) [gomax 2] for exactly 30 calls (10 per thread + 0)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
23:51:51 W http.go:617> Parsed non ok code 503 (HTTP/1.1 503)
Ended after 71.05365ms : 30 calls. qps=422.22
Aggregated Function Time : count 30 avg 0.0053360199 +/- 0.004219 min 0.000487853 max 0.018906468 sum 0.160080597
# range, mid point, percentile, count
>= 0.000487853  0.001  0.002  0.003  0.004  0.005  0.006  0.007  0.008  0.009  0.014  0.018