k8s service 负载均衡策略probability，k8s注册中心如何负载均衡状态

标题：K8s 中 Service 负载均衡策略 Probability 的实践与分析

在 Kubernetes（K8s）中，Service 是一种用于定义和访问一组 Pod 的抽象概念，它提供了一种稳定的网络访问方式，使得应用程序可以在集群中轻松地进行扩展和部署，K8s 提供了多种负载均衡策略，Probability 策略是一种基于概率的负载均衡算法，它可以根据用户定义的权重将请求分配到不同的 Pod 上，本文将详细介绍 K8s Service 负载均衡策略 Probability 的工作原理、实践方法以及如何进行状态监测和优化。

一、Probability 负载均衡策略的工作原理

Probability 负载均衡策略是一种基于概率的负载均衡算法，它根据用户定义的权重将请求分配到不同的 Pod 上，在 K8s 中，Probability 策略的实现是通过为每个 Pod 分配一个权重值来实现的，当有请求到达 Service 时，K8s 会根据每个 Pod 的权重值计算出一个概率值，然后根据概率值将请求分配到相应的 Pod 上。

如果有三个 Pod，它们的权重值分别为 1、2、3，那么它们的概率值分别为 1/6、2/6、3/6，当有请求到达 Service 时，K8s 会随机选择一个 1 到 6 之间的整数，如果选择的整数为 1，那么请求将被分配到第一个 Pod 上；如果选择的整数为 2 或 3，那么请求将被分配到第二个 Pod 上；如果选择的整数为 4、5 或 6，那么请求将被分配到第三个 Pod 上。

二、Probability 负载均衡策略的实践方法

在 K8s 中，使用 Probability 负载均衡策略非常简单，需要在 Service 的定义中指定负载均衡策略为 Probability，需要为每个 Pod 定义一个权重值，权重值的大小表示 Pod 在负载均衡中的重要性，权重值越大，Pod 被分配到请求的概率就越高。

以下是一个使用 Probability 负载均衡策略的 Service 定义示例：

apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: my-app
  type: LoadBalancer
  sessionAffinity: None
  externalTrafficPolicy: Cluster
  ports:
  - name: http
    port: 80
    targetPort: 8080
  loadBalancerIP: 10.0.0.10
  sessionAffinityConfig:
    clientIP:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    cookie:
      name: app
      sameSite: None
  sessionAffinityConfig:
    none: {}
  sessionAffinityConfig:
    sourceIP:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    tcp:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    ingress:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    h2:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    grpc:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    http2:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    websocket:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    dns:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    tls:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    grpcs:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    http3:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    quic:
      timeoutSeconds: 1800
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: auto
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: true
      initial: 7500
      interval: 2500
      timeout: 20000
  sessionAffinityConfig:
    tcpkeepalive:
      enabled: false
  sessionAffinityConfig:
    tcpkeepalive

标签： #K8s #Service #负载均衡策略 #注册中心