mirror of https://github.com/istio/istio.io.git
* Sync #13208 into Chinese * Update content/zh/docs/tasks/traffic-management/request-timeouts/index.md Co-authored-by: Michael <haifeng.yao@daocloud.io> * Add missed translation * fix --------- Co-authored-by: Michael <haifeng.yao@daocloud.io>
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Wilson Wu
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@ -11,93 +11,188 @@ test: yes
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本任务用于示范如何使用 Istio 在 Envoy 中设置请求超时。
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{{< boilerplate gateway-api-gamma-support >}}
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## 开始之前 {#before-you-begin}
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* 按照[安装指南](/zh/docs/setup/)中的说明安装 Istio。
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* 部署示例应用程序 [Bookinfo](/zh/docs/examples/bookinfo/)，
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并应用[默认目标规则](/zh/docs/examples/bookinfo/#apply-default-destination-rules)。
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* 运行以下命令初始化应用的版本路由：
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{{< text bash >}}
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$ kubectl apply -f @samples/bookinfo/networking/virtual-service-all-v1.yaml@
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{{< /text >}}
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包括[服务版本](/zh/docs/examples/bookinfo/#define-the-service-versions)。
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## 请求超时 {#request-timeouts}
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HTTP 请求的超时可以用[路由规则](/zh/docs/reference/config/networking/virtual-service/#HTTPRoute)的
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**timeout** 字段来指定。默认情况下，超时是禁用的，本任务中，会把 `reviews` 服务的超时设置为 1 秒。
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HTTP 请求的超时可以通过路由规则中的 timeout 字段来指定。
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默认情况下，超时是禁用的，本任务中，会把 `reviews` 服务的超时设置为半秒。
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为了观察效果，还需要在对 `ratings` 服务的调用上人为引入 2 秒的延迟。
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1. 将请求路由到 `reviews` 服务的 v2 版本，它会发起对 `ratings` 服务的调用：
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: reviews
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spec:
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hosts:
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- reviews
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http:
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- route:
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- destination:
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host: reviews
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subset: v2
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EOF
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{{< /text >}}
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{{< tabset category-name="config-api" >}}
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1. 给对 `ratings` 服务的调用添加 2 秒的延迟：
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{{< tab name="Istio APIs" category-value="istio-apis" >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: ratings
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spec:
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hosts:
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- ratings
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http:
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- fault:
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delay:
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percent: 100
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fixedDelay: 2s
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route:
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- destination:
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host: ratings
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subset: v1
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EOF
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{{< /text >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: reviews
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spec:
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hosts:
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- reviews
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http:
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- route:
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- destination:
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host: reviews
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subset: v2
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EOF
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{{< /text >}}
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1. 在浏览器中打开 Bookinfo 的网址 `http://$GATEWAY_URL/productpage`。
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{{< /tab >}}
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{{< tab name="Gateway API" category-value="gateway-api" >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: gateway.networking.k8s.io/v1beta1
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kind: HTTPRoute
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metadata:
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name: reviews
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spec:
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parentRefs:
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- group: ""
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kind: Service
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name: reviews
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port: 9080
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rules:
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- backendRefs:
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- name: reviews-v2
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port: 9080
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EOF
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{{< /text >}}
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{{< /tab >}}
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{{< /tabset >}}
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2) 给对 `ratings` 服务的调用添加 2 秒的延迟：
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{{< tabset category-name="config-api" >}}
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{{< tab name="Istio APIs" category-value="istio-apis" >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: ratings
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spec:
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hosts:
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- ratings
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http:
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- fault:
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delay:
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percent: 100
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fixedDelay: 2s
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route:
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- destination:
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host: ratings
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subset: v1
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EOF
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{{< /text >}}
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{{< /tab >}}
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{{< tab name="Gateway API" category-value="gateway-api" >}}
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Gateway API 尚不支持故障注入，因此我们现在需要使用
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Istio `VirtualService` 来添加延迟：
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: ratings
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spec:
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hosts:
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- ratings
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http:
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- fault:
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delay:
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percent: 100
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fixedDelay: 2s
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route:
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- destination:
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host: ratings
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EOF
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{{< /text >}}
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{{< /tab >}}
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{{< /tabset >}}
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3) 在浏览器中打开 Bookinfo 的网址 `http://$GATEWAY_URL/productpage`。
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这时可以看到 Bookinfo 应用运行正常（显示了评级的星型符号），但是每次刷新页面，
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都会有 2 秒的延迟。
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1. 现在给对 `reviews` 服务的调用增加一个半秒的请求超时：
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4) 现在给对 `reviews` 服务的调用增加一个半秒的请求超时：
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: reviews
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spec:
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hosts:
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- reviews
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http:
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- route:
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- destination:
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host: reviews
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subset: v2
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timeout: 0.5s
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EOF
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{{< /text >}}
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{{< tabset category-name="config-api" >}}
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1. 刷新 Bookinfo 页面。
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{{< tab name="Istio APIs" category-value="istio-apis" >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: reviews
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spec:
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hosts:
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- reviews
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http:
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- route:
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- destination:
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host: reviews
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subset: v2
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timeout: 0.5s
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EOF
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{{< /text >}}
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{{< /tab >}}
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{{< tab name="Gateway API" category-value="gateway-api" >}}
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{{< text bash >}}
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$ kubectl apply -f - <<EOF
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apiVersion: gateway.networking.k8s.io/v1beta1
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kind: HTTPRoute
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metadata:
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name: reviews
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spec:
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parentRefs:
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- group: ""
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kind: Service
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name: reviews
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port: 9080
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rules:
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- backendRefs:
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- name: reviews-v2
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port: 9080
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timeouts:
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request: 500ms
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EOF
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{{< /text >}}
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{{< /tab >}}
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{{< /tabset >}}
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5) 刷新 Bookinfo 页面。
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这时候应该看到 1 秒钟就会返回，而不是之前的 2 秒钟，但 `reviews` 是不可用的。
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@ -130,8 +225,26 @@ HTTP 请求的超时可以用[路由规则](/zh/docs/reference/config/networking
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* 删除应用程序的路由规则：
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{{< text bash >}}
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$ kubectl delete -f @samples/bookinfo/networking/virtual-service-all-v1.yaml@
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{{< /text >}}
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{{< tabset category-name="config-api" >}}
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* 如果您不打算探索任何后续任务，请参阅 [Bookinfo 清理](/zh/docs/examples/bookinfo/#cleanup)的说明关闭应用程序。
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{{< tab name="Istio APIs" category-value="istio-apis" >}}
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{{< text bash >}}
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$ kubectl delete -f @samples/bookinfo/networking/virtual-service-all-v1.yaml@
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{{< /text >}}
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{{< /tab >}}
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{{< tab name="Gateway API" category-value="gateway-api" >}}
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{{< text bash >}}
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$ kubectl delete httproute reviews
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$ kubectl delete virtualservice ratings
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{{< /text >}}
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{{< /tab >}}
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{{< /tabset >}}
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* 如果您不打算探索任何后续任务，请参阅
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[Bookinfo 清理](/zh/docs/examples/bookinfo/#cleanup)的说明关闭应用程序。
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