调试 istio 速率限制处理程序

Question

我正在尝试对我们的一些内部服务（在网格内）应用速率限制。

我使用了文档中的示例并生成了 redis 速率限制配置，其中包括 (redis) 处理程序、配额实例、配额规范、配额规范绑定和应用处理程序的规则。

这个redis处理程序：

apiVersion: config.istio.io/v1alpha2
kind: handler
metadata:
  name: redishandler
  namespace: istio-system
spec:
  compiledAdapter: redisquota
  params:
    redisServerUrl: <REDIS>:6379
    connectionPoolSize: 10
    quotas:
    - name: requestcountquota.instance.istio-system
      maxAmount: 10
      validDuration: 100s
      rateLimitAlgorithm: FIXED_WINDOW
      overrides:
      - dimensions:
          destination: s1
        maxAmount: 1
      - dimensions:
          destination: s3
        maxAmount: 1
      - dimensions:
          destination: s2
        maxAmount: 1

配额实例（我目前只对目的地限制感兴趣）：

apiVersion: config.istio.io/v1alpha2
kind: instance
metadata:
  name: requestcountquota
  namespace: istio-system
spec:
  compiledTemplate: quota
  params:
    dimensions:
      destination: destination.labels["app"] | destination.service.host | "unknown"

一个配额规范，如果我理解正确的话，每个请求收取 1：

apiVersion: config.istio.io/v1alpha2
kind: QuotaSpec
metadata:
  name: request-count
  namespace: istio-system
spec:
  rules:
  - quotas:
    - charge: 1
      quota: requestcountquota

所有参与服务预取的配额绑定规范。我也试过 service: "*" 也什么也没做。

apiVersion: config.istio.io/v1alpha2
kind: QuotaSpecBinding
metadata:
  name: request-count
  namespace: istio-system
spec:
  quotaSpecs:
  - name: request-count
    namespace: istio-system
  services:
  - name: s2
    namespace: default
  - name: s3
    namespace: default
  - name: s1
    namespace: default
    # - service: '*'  # Uncomment this to bind *all* services to request-count

应用处理程序的规则。目前在所有场合（尝试匹配但也没有改变任何东西）：

apiVersion: config.istio.io/v1alpha2
kind: rule
metadata:
  name: quota
  namespace: istio-system
spec:
  actions:
  - handler: redishandler
    instances:
    - requestcountquota

所有参与者的 VirtualService 定义都非常相似：

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: s1
spec:
  hosts:
  - s1

  http:
  - route:
    - destination:
        host: s1

问题是什么都没有发生，也没有发生速率限制。我在网格内用 pods 中的 curl 进行了测试。 redis 实例是空的（db 0 上没有键，我假设这是速率限制会使用的）所以我知道它实际上不能限制任何东西。

处理程序似乎配置正确（我如何确定？）因为我在其中有一些错误，这些错误已在混合器（策略）中报告。仍然有一些错误，但 none 我将其与此问题或配置相关联。唯一提到 redis 处理程序的行是：

2019-12-17T13:44:22.958041Z info    adapters    adapter closed all scheduled daemons and workers    {"adapter": "redishandler.istio-system"}

但不清楚是不是问题。我假设不是。

这些是我部署后重新加载的其余行：

2019-12-17T13:44:22.601644Z info    Built new config.Snapshot: id='43'
2019-12-17T13:44:22.601866Z info    adapters    getting kubeconfig from: "" {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.601881Z warn    Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
2019-12-17T13:44:22.602718Z info    adapters    Waiting for kubernetes cache sync...    {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.903844Z info    adapters    Cache sync successful.  {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.903878Z info    adapters    getting kubeconfig from: "" {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.903882Z warn    Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
2019-12-17T13:44:22.904808Z info    Setting up event handlers
2019-12-17T13:44:22.904939Z info    Starting Secrets controller
2019-12-17T13:44:22.904991Z info    Waiting for informer caches to sync
2019-12-17T13:44:22.957893Z info    Cleaning up handler table, with config ID:42
2019-12-17T13:44:22.957924Z info    adapters    deleted remote controller   {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.957999Z info    adapters    adapter closed all scheduled daemons and workers    {"adapter": "prometheus.istio-system"}
2019-12-17T13:44:22.958041Z info    adapters    adapter closed all scheduled daemons and workers    {"adapter": "redishandler.istio-system"}   
2019-12-17T13:44:22.958065Z info    adapters    shutting down daemon... {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.958050Z info    adapters    shutting down daemon... {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.958096Z info    adapters    shutting down daemon... {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:22.958182Z info    adapters    shutting down daemon... {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:44:23.958109Z info    adapters    adapter closed all scheduled daemons and workers    {"adapter": "kubernetesenv.istio-system"}
2019-12-17T13:55:21.042131Z info    transport: loopyWriter.run returning. connection error: desc = "transport is closing"
2019-12-17T14:14:00.265722Z info    transport: loopyWriter.run returning. connection error: desc = "transport is closing"

我正在使用带有 disablePolicyChecks: false 的 demo 配置文件来启用速率限制。这是在 istio 1.4.0 上，部署在 EKS 上。

我还尝试了低限制的 memquota（这是我们的暂存环境），但似乎没有任何效果。无论我超过配置的速率限制多少，我都没有收到 429。

我不知道如何调试它并查看配置错误导致它什么都不做。

感谢任何帮助。

Answer 1

我也花了几个小时试图破译文档并让示例工作。

根据文档，他们建议我们启用策略检查：

https://istio.io/docs/tasks/policy-enforcement/rate-limiting/

然而，当这不起作用时，我做了一个 "istioctl profile dump"，搜索策略，并尝试了几种设置。

我使用了 Helm 安装并通过了以下操作，然后能够获得所描述的行为：

--设置global.disablePolicyChecks=false \ --set values.pilot.policy.enabled=true \ ===> 这使它起作用，但它不在文档中。

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