Docker 打包 K8s镜像的应用实例

```dockerfile
# 使用官方基础镜像
FROM node:18-alpine
# 设置工作目录
WORKDIR /app
# 复制依赖文件
COPY package*.json ./
# 安装依赖
RUN npm install
# 复制源代码
COPY . .
# 暴露端口
EXPOSE 8080
# 启动命令
CMD ["npm", "start"]
```

docker build -t my-app:1.0.0 .
#查看镜像
docker images | grep my-app

运行容器
docker run -d -p 8080:8080 --name my-app my-app:1.0.0
验证运行
curl <http://localhost:8080>

# 登录 Docker Hub
docker login
# 标记镜像
docker tag my-app:1.0.0 username/my-app:1.0.0
# 推送镜像
docker push username/my-app:1.0.0

 apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: my-app
 spec:
   replicas: 3
   selector:
     matchLabels:
       app: my-app
   template:
     metadata:
       labels:
         app: my-app
     spec:
       containers:
       - name: my-app
         image: username/my-app:1.0.0
         ports:
         - containerPort: 8080
         resources:
           limits:
             memory: "512Mi"
             cpu: "500m"

  apiVersion: v1
  kind: Service
  metadata:
    name: my-app-service
  spec:
    selector:
      app: my-app
    ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
    type: LoadBalancer

kubectl apply -f deployment.yaml
kubectl apply -f service.yaml
# 查看部署状态
kubectl get pods
kubectl get service

# 查看容器日志
kubectl logs <pod-name>
# 进入容器调试
kubectl exec -it <pod-name> -- /bin/sh
# 删除部署
kubectl delete -f deployment.yaml