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特征流量分派

背景

在懒加载的方案中，默认会将首次请求的流量（找不到路由的流量）兜底至gs

但在实际落地过程中并不是所有流量都要兜底至gs, 也并不是兜底路由必须走global-sidecar

方案

通过envoyfilter方式，将流量转发至特定的 cluster

使用

在slimeboot中配置dispatches, 将域名是www.163.com *.svc.cluster.local (?:[^.])+ 流量转发到_GLOBAL_SIDECAR

配置 passthroughByDefault，将兜底流量改成PASSTHROUGH

其中domains内容等同于envoy rds中的domain，支持前缀、后缀、精确

如果需要复杂的匹配规则，可以使用domainRegex

apiVersion: config.netease.com/v1alpha1
kind: SlimeBoot
metadata:
  name: lazyload
  namespace: mesh-operator
spec:
  image:
    pullPolicy: Always
    repository: docker.io/slimeio/slime-lazyload
    tag: v0.9.0
  namespace: mesh-operator
  istioNamespace: istio-system
  module:
    - name: lazyload
      kind: lazyload
      enable: true
      general:
        passthroughByDefault: true
        dispatches:
          - name: fake
            domains:
              - "www.163.com"
              - "*.svc.cluster.local"
            cluster:  _GLOBAL_SIDECAR # dispatch特性，特殊标识，标识gs   
          - domainRegex: ^(?:[^.])+$
            cluster:  _GLOBAL_SIDECAR        
        autoPort: true
        autoFence: true
        defaultFence: true   
        wormholePort: # replace to your application service ports, and extend the list in case of multi ports
          - "9080"
        globalSidecarMode: cluster # the mode of global-sidecar
        metricSourceType: accesslog # indicate the metric source          
      global:
        log:
          logLevel: info
        slimeNamespace: mesh-operator
  resources:
    requests:
      cpu: 300m
      memory: 300Mi
    limits:
      cpu: 600m
      memory: 600Mi        
  component:
    globalSidecar:
      enable: true
      sidecarInject:
        enable: true # should be true
        mode: pod
        labels: # optional, used for sidecarInject.mode = pod
          sidecar.istio.io/inject: "true"
      resources:
        requests:
          cpu: 200m
          memory: 200Mi
        limits:
          cpu: 400m
          memory: 400Mi
      image:
        repository: docker.io/slimeio/slime-global-sidecar
        tag: v0.9.0
      probePort: 20000
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