Istio流量拆分未正确使用权重

Question

我正在使用默认的bookinfo应用程序https://istio.io/docs/examples/bookinfo/，并尝试使用评论服务测试拆分流量。Kiali显示了拆分，一切似乎都配置正确，但它仍在进行循环调度。如果我删除所有虚拟服务和目的地规则，应用程序会正常工作。

# Source: bookinfo/templates/destination-rule-all.yaml
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: productpage
spec:
  host: productpage
  subsets:
  - name: v1
    labels:
      version: v1
---
# Source: bookinfo/templates/destination-rule-all.yaml
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: ratings
spec:
  host: ratings
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2
  - name: v2-mysql
    labels:
      version: v2-mysql
  - name: v2-mysql-vm
    labels:
      version: v2-mysql-vm
---
# Source: bookinfo/templates/destination-rule-all.yaml
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: details
spec:
  host: details
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2
---
# Source: bookinfo/templates/destination-rule-all.yaml
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: reviews
spec:
  host: reviews
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2
  - name: v3
    labels:
      version: v3
---
# Source: bookinfo/templates/bookinfo-gateway.yaml
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: bookinfo-gateway
  chart: bookinfo-0.1.2
  release: bookinfo
spec:
  selector:
    istio: ingressgateway # use istio default controller
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"
---
# Source: bookinfo/templates/bookinfo-gateway.yaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: bookinfo
  chart: bookinfo-0.1.2
  release: bookinfo
spec:
  hosts:
  - "*"
  gateways:
  - bookinfo-gateway
  http:
  - match:
    - uri:
        exact: /productpage
    - uri:
        prefix: /static
    - uri:
        exact: /login
    - uri:
        exact: /logout
    - uri:
        prefix: /api/v1/products
    route:
    - destination:
        host: productpage
        port:
          number: 9080
---
# Source: bookinfo/templates/virtual-service-all-v1.yaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: productpage
spec:
  hosts:
  - productpage
  gateways:
  - bookinfo-gateway
  http:
  - route:
    - destination:
        host: productpage
        subset: v1
---
# Source: bookinfo/templates/virtual-service-all-v1.yaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
  - reviews
  gateways:
  - bookinfo-gateway
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
      weight: 100
    - destination:
        host: reviews
        subset: v2
      weight: 0
    - destination:
        host: reviews
        subset: v3
      weight: 0
---
# Source: bookinfo/templates/virtual-service-all-v1.yaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: ratings
spec:
  hosts:
  - ratings
  gateways:
  - bookinfo-gateway
  http:
  - route:
    - destination:
        host: ratings
        subset: v1
---
# Source: bookinfo/templates/virtual-service-all-v1.yaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: details
spec:
  hosts:
  - details
  gateways:
  - bookinfo-gateway
  http:
  - route:
    - destination:
        host: details
        subset: v1

# Source: bookinfo/templates/reviews-v1-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: reviews-v1
  labels:
    chart: bookinfo-0.1.2
    release: bookinfo
    app: reviews
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: reviews
      release: bookinfo
      version: v1
  template:
    metadata:
      labels:
        app: reviews
        release: bookinfo
        version: v1
    spec:
      serviceAccountName: bookinfo-reviews
      containers:
      - name: reviews
        image: myhub/istio/examples-bookinfo-reviews-v1:1.15.0
        imagePullPolicy: IfNotPresent
        env:
        - name: LOG_DIR
          value: "/tmp/logs"
        ports:
        - containerPort: 9080
        volumeMounts:
        - name: tmp
          mountPath: /tmp
        - name: wlp-output
          mountPath: /opt/ibm/wlp/output
      volumes:
      - name: wlp-output
        emptyDir: {}
      - name: tmp
        emptyDir: {}
---
# Source: bookinfo/templates/reviews-v2-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: reviews-v2
  labels:
    chart: bookinfo-0.1.2
    release: bookinfo
    app: reviews
    version: v2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: reviews
      release: bookinfo
      version: v2
  template:
    metadata:
      labels:
        app: reviews
        release: bookinfo
        version: v2
    spec:
      serviceAccountName: bookinfo-reviews
      containers:
      - name: reviews
        image: myhub/istio/examples-bookinfo-reviews-v2:1.15.0
        imagePullPolicy: IfNotPresent
        env:
        - name: LOG_DIR
          value: "/tmp/logs"
        ports:
        - containerPort: 9080
        volumeMounts:
        - name: tmp
          mountPath: /tmp
        - name: wlp-output
          mountPath: /opt/ibm/wlp/output
      volumes:
      - name: wlp-output
        emptyDir: {}
      - name: tmp
        emptyDir: {}
---
# Source: bookinfo/templates/reviews-v3-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  metadata:
  name: reviews-v3
  labels:
    chart: bookinfo-0.1.2
    release: bookinfo
    app: reviews
    version: v3
spec:
  replicas: 1
  selector:
    matchLabels:
      app: reviews
      release: bookinfo
      version: v3
  template:
    metadata:
      labels:
        app: reviews
        release: bookinfo
        version: v3
    spec:
      serviceAccountName: bookinfo-reviews
      containers:
      - name: ratings
        image: myhub/istio/examples-bookinfo-reviews-v3:1.15.0
        imagePullPolicy: IfNotPresent
        env:
        - name: LOG_DIR
          value: "/tmp/logs"
        ports:
        - containerPort: 9080
        volumeMounts:
        - name: tmp
          mountPath: /tmp
        - name: wlp-output
          mountPath: /opt/ibm/wlp/output
      volumes:
      - name: wlp-output
        emptyDir: {}
      - name: tmp
        emptyDir: {}
---

环境

kind v0.7.0 go1.13.6 linux/amd64

K8s v1.18.1 v1.17.0

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Answer 1

我试着用istio 1.5.2在gke上重现你的问题，一切正常。

我跟踪了istio bookinfo documentation

kubectl apply -f samples/bookinfo/platform/kube/bookinfo.yaml
kubectl apply -f samples/bookinfo/networking/bookinfo-gateway.yaml

如前所述，here

应用默认目标规则

在使用Istio控制Bookinfo版本路由之前，您需要在目标规则中定义可用版本，称为子集。

运行以下命令为Bookinfo服务创建默认目标规则：

如果您没有启用mutual TLS，请执行以下命令：

如果您不熟悉Istio并且正在使用演示配置文件，请选择此选项。

$ kubectl apply -f samples/bookinfo/networking/destination-rule-all.yaml

如果您启用了mutual TLS，请执行以下命令：

$ kubectl apply -f samples/bookinfo/networking/destination-rule-all-mtls.yaml

等待几秒钟以传播目标规则。

您可以使用以下命令显示目标规则：

$ kubectl get destinationrules -o yaml

应用您的虚拟服务进行评论

示例

仅用于子集v1的流量。

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

仅用于子集v2的流量。

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

子集v2和v3的流量权重为50/50。

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
  - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v2
      weight: 50
    - destination:
        host: reviews
        subset: v3
      weight: 50

子集v1、v2和v3的100/0/0权重流量。

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
  - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v2
      weight: 100
    - destination:
        host: reviews
        subset: v3
      weight: 0
    - destination:
        host: reviews
        subset: v1
      weight: 0

对于仅针对子集的虚拟服务，v1 Kiali显示流量仅流向v1

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​

Istio productpage没有显示明星，所以它是review v1。

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这里有一些关于weight-based routing的文档可供查阅。