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深入解析K8s Service负载均衡策略，从原理到实战，k8s 负载均衡

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本文目录导读：

  1. K8s Service简介
  2. K8s Service负载均衡策略

随着云计算和微服务架构的兴起，容器技术逐渐成为企业应用部署的首选，Kubernetes（简称K8s）作为容器编排的领导者，已经成为业界的事实标准，在K8s中，Service是重要的抽象概念，用于实现服务发现和负载均衡，本文将从原理到实战，深入解析K8s Service的负载均衡策略。

K8s Service简介

K8s Service是一种抽象层，用于将一组Pods映射为一个统一的访问接口，Service可以实现以下功能：

1、服务发现：客户端可以通过Service的DNS名称或IP地址访问服务。

深入解析K8s Service负载均衡策略，从原理到实战，k8s 负载均衡

图片来源于网络，如有侵权联系删除

2、负载均衡：Service根据设定的策略，将请求分发到后端的Pods。

3、服务持久化：Service的IP地址和端口在Pods的增删过程中保持不变。

K8s Service负载均衡策略

K8s Service提供了多种负载均衡策略，以下将详细介绍每种策略的特点和适用场景。

1、RoundRobin（轮询）

轮询策略是Service默认的负载均衡策略，按照客户端请求的顺序，依次将请求分发到后端的Pods，当某个Pod的响应时间较长时，后续请求将轮询到其他Pod，从而实现负载均衡。

适用场景：适用于对响应时间要求不高、Pods资源均衡的场景。

2、ClientIP

深入解析K8s Service负载均衡策略，从原理到实战，k8s 负载均衡

图片来源于网络，如有侵权联系删除

ClientIP策略根据客户端的IP地址，将请求分发到固定的Pod，在客户端多次请求同一服务时，将始终请求到同一Pod，从而保证请求的会话一致性。

适用场景：适用于需要会话保持的场景，如Web应用。

3、最少连接数（LeastConnection）

最少连接数策略根据后端Pod的当前连接数，将请求分发到连接数最少的Pod，当某个Pod的负载较高时，后续请求将分发到其他连接数较少的Pod，从而实现负载均衡。

适用场景：适用于后端Pod资源差异较大的场景。

4、随机（Random）

随机策略将请求随机分发到后端的Pods，每个Pod被选中的概率相等，从而实现负载均衡。

深入解析K8s Service负载均衡策略，从原理到实战，k8s 负载均衡

图片来源于网络，如有侵权联系删除

适用场景：适用于对负载均衡要求不高、Pods资源均衡的场景。

5、最小失败数（LeastWeight）

最小失败数策略根据后端Pod的失败次数，将请求分发到失败次数最少的Pod，当某个Pod的失败次数较多时，后续请求将分发到其他失败次数较少的Pod，从而实现负载均衡。

适用场景：适用于后端Pod质量差异较大的场景。

四、实战：配置K8s Service负载均衡策略

以下是一个配置K8s Service负载均衡策略的示例：

apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  selector:
    app: my-app
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  loadBalancerSourceRanges:
    - 192.168.1.0/24
  loadBalancerIP: 192.168.1.100
  sessionAffinity: ClientIP
  type: LoadBalancer
  load

标签： #k8sservice负载均衡策略

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