无状态应用迁移实战:将HTTP服务器平滑迁移到Kubernetes
引言
将应用迁移到 Kubernetes 是云原生转型的关键步骤。本文将完整演示如何将 Go HTTP 服务器从 Docker 容器平滑迁移到 Kubernetes 平台,包括部署、服务暴露、监控等完整流程。
一、迁移准备
1.1 迁移检查清单
- ✅ 应用已容器化
- ✅ 镜像已推送到仓库
- ✅ 配置外部化
- ✅ 健康检查端点
- ✅ 日志标准化
1.2 应用分析
Go HTTP 服务器特点:
- 无状态应用
- 支持水平扩展
- 有健康检查端点
- 环境变量配置
二、创建 Kubernetes 资源
2.1 Deployment
apiVersion:apps/v1kind:Deploymentmetadata:name:http-serverlabels:app:http-serverversion:v1.0.0spec:replicas:3strategy:type:RollingUpdaterollingUpdate:maxSurge:1maxUnavailable:0selector:matchLabels:app:http-servertemplate:metadata:labels:app:http-serverversion:v1.0.0spec:containers:-name:http-serverimage:http-server:v1.0.0imagePullPolicy:IfNotPresentports:-name:httpcontainerPort:8080protocol:TCPenv:-name:PORTvalue:"8080"-name:ENVvalue:"production"resources:requests:memory:"128Mi"cpu:"100m"limits:memory:"256Mi"cpu:"500m"livenessProbe:httpGet:path:/healthport:8080initialDelaySeconds:30periodSeconds:10timeoutSeconds:5failureThreshold:3readinessProbe:httpGet:path:/healthport:8080initialDelaySeconds:5periodSeconds:5timeoutSeconds:3failureThreshold:3startupProbe:httpGet:path:/healthport:8080failureThreshold:30periodSeconds:102.2 Service
apiVersion:v1kind:Servicemetadata:name:http-serverlabels: