マルチクラウド戦略

# Kubernetes のマニフェスト（クラウドに依存しない）
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nakamura-web
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nakamura-web
  template:
    metadata:
      labels:
        app: nakamura-web
    spec:
      containers:
      - name: web
        image: nakamura/web-app:v1.0
        ports:
        - containerPort: 80
        resources:
          limits:
            cpu: "500m"
            memory: "256Mi"

# Terraform で AWS の EC2 を定義
provider "aws" {
  region = "ap-northeast-1"
}

resource "aws_instance" "web" {
  ami           = "ami-0abcdef1234567890"
  instance_type = "t3.small"

  tags = {
    Name        = "nakamura-web"
    Environment = "production"
  }
}

# 同じ Terraform で GCP の Compute Engine も定義可能
provider "google" {
  project = "nakamura-project"
  region  = "asia-northeast1"
}

resource "google_compute_instance" "web" {
  name         = "nakamura-web"
  machine_type = "e2-small"
  zone         = "asia-northeast1-a"

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }

  network_interface {
    network = "default"
  }
}

// 抽象化レイヤーの例（Hexagonal Architecture）
interface ObjectStorage {
  upload(key: string, data: Buffer): Promise<void>;
  download(key: string): Promise<Buffer>;
  delete(key: string): Promise<void>;
}

// AWS S3 アダプター
class S3Storage implements ObjectStorage {
  async upload(key: string, data: Buffer): Promise<void> {
    await s3Client.putObject({ Bucket: this.bucket, Key: key, Body: data });
  }
  // ...
}

// GCP Cloud Storage アダプター
class GCSStorage implements ObjectStorage {
  async upload(key: string, data: Buffer): Promise<void> {
    await this.bucket.file(key).save(data);
  }
  // ...
}