Kubernetes 服务部署全解析：从镜像构建到集群发布实战指南

# Builder 阶段
FROM maven:3.8.7-openjdk-17 AS builder
WORKDIR /app
COPY pom.xml .
COPY src ./src
RUN mvn clean package -DskipTests

# 运行阶段
FROM openjdk:17-jdk-alpine
WORKDIR /app
COPY --from=builder /app/target/app.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "app.jar"]

docker build -t your-registry.com/your-project/app:v1.0 .
docker push your-registry.com/your-project/app:v1.0

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-deployment
  labels:
    app: app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: app-container
        image: your-registry.com/your-project/app:v1.0
        ports:
        - containerPort: 8080
        env:
        - name: SPRING_PROFILES_ACTIVE
          value: "prod"
      imagePullSecrets:
      - name: regcred   # 如果使用私有仓库，需提前创建 secret

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

kubectl apply -f deployment.yaml
kubectl apply -f service.yaml

kubectl rollout status deployment/app-deployment

kubectl set image deployment/app-deployment app-container=your-registry.com/your-project/app:v1.1

kubectl rollout undo deployment/app-deployment

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  application.properties: |
    server.port=8080
    logging.level.root=INFO

volumeMounts:
- name: config-volume
  mountPath: /app/config
volumes:
- name: config-volume
  configMap:
    name: app-config

kubectl autoscale deployment app-deployment --min=2 --max=10 --cpu-percent=60