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Kubernetes 与服务发现最佳实践

news 2026/6/12 5:07:16

Kubernetes 与服务发现最佳实践

一、前言

哥们，别整那些花里胡哨的。服务发现是微服务架构的核心，今天直接上硬货，教你如何在 Kubernetes 中实现高效的服务发现。

二、服务发现机制

机制	适用场景	优势	劣势
DNS	集群内服务	原生支持	缓存延迟
环境变量	简单场景	无需配置	不可动态更新
Service	稳定服务	负载均衡	配置复杂
Endpoints	自定义服务	灵活	管理复杂
EndpointSlice	大规模服务	可扩展性	学习成本高

三、实战配置

1. Service 配置

apiVersion: v1 kind: Service metadata: name: app-service namespace: default spec: selector: app: app ports: - port: 80 targetPort: 8080 type: ClusterIP --- apiVersion: v1 kind: Service metadata: name: app-service-external namespace: default spec: selector: app: app ports: - port: 80 targetPort: 8080 type: LoadBalancer

2. Endpoints 配置

apiVersion: v1 kind: Endpoints metadata: name: app-service namespace: default subsets: - addresses: - ip: 10.0.0.1 - ip: 10.0.0.2 - ip: 10.0.0.3 ports: - port: 8080 protocol: TCP --- apiVersion: v1 kind: EndpointSlice metadata: name: app-service-1 namespace: default labels: kubernetes.io/service-name: app-service spec: addresses: - ip: 10.0.0.1 - ip: 10.0.0.2 ports: - name: http port: 8080 protocol: TCP

3. DNS 配置

apiVersion: v1 kind: ConfigMap metadata: name: coredns namespace: kube-system data: Corefile: | .:53 { errors health { lameduck 5s } ready kubernetes cluster.local in-addr.arpa ip6.arpa { pods insecure fallthrough in-addr.arpa ip6.arpa ttl 30 } prometheus :9153 forward . /etc/resolv.conf cache 30 loop reload loadbalance }

4. 服务发现使用

apiVersion: apps/v1 kind: Deployment metadata: name: app namespace: default spec: replicas: 3 selector: matchLabels: app: app template: metadata: labels: app: app spec: containers: - name: app image: nginx:latest env: - name: SERVICE_DISCOVERY value: "kubernetes" - name: APP_SERVICE_HOST value: "app-service.default.svc.cluster.local" - name: APP_SERVICE_PORT value: "80" ports: - containerPort: 8080

四、服务发现优化

1. 健康检查

apiVersion: v1 kind: Service metadata: name: app-service namespace: default spec: selector: app: app ports: - port: 80 targetPort: 8080 healthCheckNodePort: 30000 --- apiVersion: apps/v1 kind: Deployment metadata: name: app namespace: default spec: replicas: 3 selector: matchLabels: app: app template: metadata: labels: app: app spec: containers: - name: app image: nginx:latest ports: - containerPort: 8080 readinessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 5 periodSeconds: 10 livenessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 15 periodSeconds: 20

2. 服务质量

apiVersion: v1 kind: Service metadata: name: app-service namespace: default spec: selector: app: app ports: - port: 80 targetPort: 8080 sessionAffinity: ClientIP sessionAffinityConfig: clientIP: timeoutSeconds: 10800

3. 负载均衡

apiVersion: v1 kind: Service metadata: name: app-service namespace: default annotations: service.beta.kubernetes.io/aws-load-balancer-type: "nlb" service.beta.kubernetes.io/aws-load-balancer-internal: "true" spec: selector: app: app ports: - port: 80 targetPort: 8080 type: LoadBalancer