无效选择器

当策略（如 AuthorizationPolicy、RequestAuthentication、Telemetry 或 WasmPlugin）中的工作负载选择器无法有效地定位 Kubernetes 网关中的任何 Pod 时，就会出现此消息。

示例

您将收到类似的消息，例如

Warning [IST0166] (AuthorizationPolicy default/ap-ineffective testdata/k8sgateway-selector.yaml:47) Ineffective selector on
Kubernetes Gateway bookinfo-gateway. Use the TargetRef field instead.

当您的策略的选择器匹配 Kubernetes 网关时。

例如，当您有一个 Kubernetes 网关 Pod，例如

apiVersion: v1
kind: Pod
metadata:
  annotations:
    istio.io/rev: default
  labels:
    gateway.networking.k8s.io/gateway-name: bookinfo-gateway
  name: bookinfo-gateway-istio-6ff4cf9645-xbqmc
  namespace: default
spec:
  containers:
  - image: proxyv2:1.21.0
    name: istio-proxy

并且存在一个带有 selector 的 AuthorizationPolicy，例如

apiVersion: security.istio.io/v1
kind: AuthorizationPolicy
metadata:
  namespace: default
  name: ap-ineffective
spec:
  selector:
    matchLabels:
      gateway.networking.k8s.io/gateway-name: bookinfo-gateway
  action: DENY
  rules:
  - from:
    - source:
      namespaces: ["dev"]
    to:
    - operation:
      methods: ["POST"]

如果您在策略中同时具有 targetRef 和 selector，则不会出现此消息。例如

apiVersion: telemetry.istio.io/v1
kind: Telemetry
metadata:
  name: telemetry-example
  namespace: default
spec:
  tracing:
  - randomSamplingPercentage: 10.00
  selector:
    matchLabels:
      gateway.networking.k8s.io/gateway-name: bookinfo-gateway
  targetRef:
    group: gateway.networking.k8s.io
    kind: Gateway
    name: bookinfo-gateway

如何解决

确保您正在将 selector 字段用于 Sidecar 或 Istio 网关 Pod，并将 targetRef 字段用于 Kubernetes 网关 Pod。否则，策略将不会应用。

以下是一个示例

apiVersion: telemetry.istio.io/v1
kind: Telemetry
metadata:
  name: telemetry-example
  namespace: default
spec:
  tracing:
  - randomSamplingPercentage: 10.00
  targetRef:
    group: gateway.networking.k8s.io
    kind: Gateway
    name: bookinfo-gateway