Istio设置请求超时

istio允许用户通过路由规则来设置请求超时，默认情况下，超时是禁用的。

下面我们将reviews的服务超时设置为1秒，然后我们对ratings服务引入2秒的故障延迟。

应用virtualservice规则

由于v1版本的reviews不调用ratings，因为后面需要引入ratings的故障注入，所以我们将请求路由到v2版本的reviews

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: productpage
spec:
  hosts:
  - productpage
  http:
    - route:
        - destination:
            host: productpage
            subset: v1
---
kind: VirtualService
metadata:
  name: details
spec:
  hosts:
  - details
  http:
    - route:
        - destination:
            host: details
            subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
  - reviews
  http:
    - route:
        - destination:
            host: reviews
            subset: v2

然后我们给ratings注入2秒的延迟

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: ratings
spec:
  hosts:
    - ratings
  http:
    - fault:
        delay:
          percent: 100
          fixedDelay: 2s
      route:
        - destination:
            host: ratings
            subset: v1

然后我们请求/produage页面，大概能看到有2秒的延迟

现在再给reviews服务增加0.5秒的请求超时

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
    - reviews
  http:
    - route:
        - destination:
            host: reviews
            subset: v2
      timeout: 0.5s

刷新/productage页面，可以发现大概半秒钟就有错误了