As I understood until now, Kubernetes is like operation system. It manages the cluster.
Helm is like docker-compose.
A good Analogy from Gemini:
| Kubernetes Concept | Analogy: The Modern City Infrastructure |
|---|---|
| Kubernetes (K8s) | The City Government & Central Infrastructure. This is the main system that manages the city’s power grid, roads, security, and scheduling. It ensures everything runs where and when it’s needed. |
| Cluster | The entire City. Everything within its boundaries. |
| Node | A City Block or a Neighborhood. These are the physical locations (servers) where housing is built and where services are offered. |
| Pod | An Apartment Unit or Small House. This is the smallest, single unit that is built and scheduled by the government (K8s) onto a specific block (Node). |
| Container | The Residents or Appliances inside the house. This is your actual application code, database, or web server running inside the Pod. |
| Deployment | The City Zoning Board & Master Plan. This blueprint specifies, “We must always have 5 identical apartment units (Pods) running in this city,” and it automatically replaces any unit that burns down or breaks. |
| Service | The Public Utility Address (e.g., a P.O. Box or Fixed Phone Number). This is the stable way for other parts of the city to contact your application, even if the house (Pod) is torn down and rebuilt in a new location. |
| Helm | A Real Estate Developer/Construction Firm. They take a complex, reusable blueprint (“The Standard Pizza App Complex”) and can instantly deploy all necessary parts (the Pods, the Services, the Deployments) across the city with simple configuration changes (like the address or size). |
Summary of the Workflow
Your goal is to run a business (your application) in this city.
- You hire Helm (The Developer) to install your application.
- Helm uses the Master Plan (Deployment) to tell the City Government (Kubernetes): “Build me 5 identical Houses (Pods).”
- Kubernetes schedules those Houses (Pods) onto various Blocks (Nodes) across the city.
- You assign a Fixed Address (Service) to those 5 Houses so that customers can always find you, no matter which Block the houses are located on.
What is Helm Chart?
| Helm Chart Component | Analogy: Prefabricated Home Kit |
|---|---|
| Helm Chart (The Package) | The entire Boxed Home Kit. It contains everything you need—the framing, the wiring, the instructions, and all the fixtures—to build a specific structure (your application). |
templates/ (The Engine) | The Architectural Blueprints and Construction Instructions. These are the generic plans that say, “Build a wall here,” but they have blanks for variables like color or size. |
values.yaml (The Configuration) | The Order Form / Options List. This single sheet of paper is where you specify: “I want the roof tiles to be Red, the number of bedrooms (replicas) to be 5, and the front door (port) to be Blue.” |
Running helm install | The Construction Crew. You hand them the Blueprints (Templates) and the Order Form (values.yaml), and they immediately start building all the necessary structures (Pods, Services, etc.) in the City (Kubernetes Cluster). |
پس به زبان فارسی:
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کوبر = شهرداری یزد
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کلاستر = شهر یزد
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نود = محله آزادشهر
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پاد = یک آپارتمان یا خونه محله
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کانتینر = ساکنین آپارتمان
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دیپلویمنت = نقشه توسعه شهری
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سرویس = آدرس پستی
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هلم = معمار حرفهای سازنده خونه
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هلم چارت = نقشه پیشساخته معمار (شاید بشه گفت فایل رندر نقشه)
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تمپلت در هلم چارت = بخشهای ثابت هر پروژه برای معمار
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فایل مقادیر = سلیقههای کارفرما که تو نقشه لحاظ میشه
نکته جالب دیگه اینه که کلاستر و نود و پاد و کانتینر زیرمجموعه هم هستند.
با همین آنالوژی داکر ایمیج هم میشه نقشه ساخت و داکر کامپوز (Docker Compose) میشه معمار محلی. مثل خونههای یزد که اکثرشون رو خود مردم ساختن و چندان مقیاسپذیر هم نیست.