Istio 流量镜像 Mirror 与百分比策略实战

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title: Istio 流量镜像 Mirror 与百分比策略实战

keywords: VirtualService, mirror, mirrorPercentage, DestinationRule, subsets

description: 使用 VirtualService 将在线流量镜像到影子服务，结合 mirrorPercentage 控制比例，安全验证新版本。

categories:

• 文章资讯
• 技术教程

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DestinationRule 定义主/影子子集：

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: api-dr
spec:
  host: api.default.svc.cluster.local
  subsets:
  - name: v1
    labels:
      version: v1
  - name: shadow
    labels:
      version: shadow

VirtualService 配置镜像与比例：

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: api-vs
spec:
  hosts:
  - api.default.svc.cluster.local
  http:
  - route:
    - destination:
        host: api.default.svc.cluster.local
        subset: v1
      weight: 100
    mirror:
      host: api-shadow.default.svc.cluster.local
    mirrorPercentage:
      value: 20