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The difference between IaaS, PaaS, and SaaS is how much you manage versus how much the provider manages.
You get: raw servers, network, and storage
You manage: App + Data + OS + Middleware
Example: AWS EC2
• You get a blank Ubuntu server
• You install Python, pip, your libraries
• You run your app manually
• Full control over everything
When to use: You need full control over the environment — like training a model on a specific GPU or running Docker.
You get: a ready platform to deploy your code directly
You manage: App + Data only
Example: Vercel / Google Cloud Run
• Push your code and it deploys automatically
• No thinking about Nginx, SSL, or Scaling
• The platform handles all infrastructure
When to use: You want to deploy an app quickly without managing servers — like FastAPI or Next.js.
You get: a complete application ready to use
You manage: Your data only
Examples: Claude.ai, ChatGPT, Notion, GitHub Copilot
• Sign in and start immediately
• No installation, no configuration, no maintenance
• Pay a monthly subscription and you're done
When to use: You want to use the service directly without any technical setup.
IaaS PaaS SaaS
Application ← You You Provider
Data ← You You You
Runtime ← You Provider Provider
Operating System ← You Provider Provider
Servers ← Provider Provider Provider
Network ← Provider Provider Provider
| Use Case | Model | Example | |----------|-------|---------| | Train model on GPU | IaaS | AWS EC2 P3 | | Deploy prediction API | PaaS | Google Cloud Run | | Use ready-made model | SaaS | Claude.ai / Bedrock | | Full ML Pipeline | PaaS | SageMaker |
Golden rule: Start at the highest layer possible (SaaS then PaaS) and drop to IaaS only when necessary.
# فهم IaaS وPaaS وSaaS — Service Model Simulation
from dataclasses import dataclass
from abc import ABC, abstractmethod
import time
@dataclass
class DeploymentResult:
platform: str
model: str
setup_time_min: int
control_level: str
cost_model: str
you_manage: list[str]
provider_manages: list[str]
class DeploymentPlatform(ABC):
"""فئة أساسية لمحاكاة منصات النشر"""
@abstractmethod
def deploy(self, app_code: str) -> DeploymentResult:
pass
def _simulate_deploy(self, steps: list[str], delay: float = 0.2):
for step in steps:
print(f" ▶ {step}...")
time.sleep(delay)
print(f" ✅")
# ─── IaaS: EC2 ────────────────────────────────────────────
class EC2Platform(DeploymentPlatform):
"""AWS EC2 — IaaS: تتحكم في كل شيء"""
def deploy(self, app_code: str) -> DeploymentResult:
print("\n🟠 IaaS — AWS EC2")
print("─"*45)
self._simulate_deploy([
"إنشاء EC2 Instance (Ubuntu 22.04)",
"إعداد Security Groups و SSH Keys",
"تثبيت Python 3.11 و pip",
"تثبيت uvicorn و fastapi و anthropic",
"نقل ملفات التطبيق عبر SCP",
"إعداد systemd service للتشغيل التلقائي",
"تكوين Nginx كـ reverse proxy",
"تثبيت SSL Certificate",
"فتح منافذ 80 و 443",
])
return DeploymentResult(
platform="AWS EC2",
model="IaaS",
setup_time_min=120,
control_level="عالي جداً — تتحكم في كل شيء",
cost_model="بالساعة حتى لو التطبيق لا يعمل",
you_manage=["التطبيق", "نظام التشغيل", "Python", "Nginx", "SSL", "Security"],
provider_manages=["الخادم الفيزيائي", "الشبكة"],
)
# ─── PaaS: Cloud Run ──────────────────────────────────────
class CloudRunPlatform(DeploymentPlatform):
"""Google Cloud Run — PaaS: ادفع كودك وانتهى"""
def deploy(self, app_code: str) -> DeploymentResult:
print("\n🔴 PaaS — Google Cloud Run")
print("─"*45)
self._simulate_deploy([
"بناء Docker Image تلقائياً",
"رفع الـ Image على Google Container Registry",
"نشر على Cloud Run (Managed)",
"SSL تلقائي + Custom Domain",
"Auto-scaling من 0 إلى لانهاية",
])
return DeploymentResult(
platform="Google Cloud Run",
model="PaaS",
setup_time_min=10,
control_level="متوسط — تتحكم في التطبيق فقط",
cost_model="تدفع فقط عند الاستخدام الفعلي (Serverless)",
you_manage=["التطبيق", "الـ Dockerfile"],
provider_manages=["نظام التشغيل", "Scaling", "SSL", "Nginx", "Security patches"],
)
# ─── SaaS: Claude.ai ──────────────────────────────────────
class ClaudeAiPlatform(DeploymentPlatform):
"""Claude.ai — SaaS: استخدم مباشرة"""
def deploy(self, app_code: str) -> DeploymentResult:
print("\n🤖 SaaS — Claude.ai")
print("─"*45)
self._simulate_deploy([
"فتح claude.ai في المتصفح",
"إنشاء حساب أو تسجيل دخول",
"البدء في الاستخدام فوراً",
], delay=0.1)
return DeploymentResult(
platform="Claude.ai",
model="SaaS",
setup_time_min=2,
control_level="منخفض — تستخدم فقط",
cost_model="اشتراك شهري ثابت",
you_manage=["محادثاتك وبياناتك فقط"],
provider_manages=["النموذج", "الخوادم", "الأمان", "التحديثات", "كل شيء"],
)
# ─── مقارنة النماذج الثلاثة ─────────────────────────────
app = "FastAPI + Claude AI"
platforms = [EC2Platform(), CloudRunPlatform(), ClaudeAiPlatform()]
results: list[DeploymentResult] = []
for platform in platforms:
result = platform.deploy(app)
results.append(result)
# ─── تقرير المقارنة ───────────────────────────────────────
print(f"\n{'='*58}")
print("📊 مقارنة نماذج الخدمة السحابية")
print("="*58)
print(f"{'المعيار':<22} {'IaaS/EC2':^14} {'PaaS/CloudRun':^14} {'SaaS/Claude':^10}")
print("─"*58)
rows = [
("وقت الإعداد", "120 دقيقة", "10 دقائق", "2 دقائق"),
("التحكم", "عالي جداً", "متوسط", "منخفض"),
("نموذج الدفع", "بالساعة", "بالاستخدام", "شهري"),
("الصيانة", "أنت", "المزود", "المزود"),
("للمبتدئين", "صعب", "متوسط", "سهل جداً"),
]
for row in rows:
print(f"{row[0]:<22} {row[1]:^14} {row[2]:^14} {row[3]:^10}")
print("\n💡 القاعدة الذهبية:")
print(" ابدأ من الأعلى: SaaS → PaaS → IaaS")
print(" انزل للأسفل فقط عند الضرورة")