Wiki.Quizz.vn

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Why Kubernetes Exists ======

Kubernetes exists to solve **real production problems** when running containers at scale.

---

===== 1. Manual container management is hard =====

Example:

You run 10 Docker containers manually.

Problems:
  * One crashes → you must restart it
  * Traffic increases → you must add more containers manually
  * Servers fail → everything breaks

👉 This does NOT scale.

---

===== 2. Need for self-healing =====

Example:

If your app runs 3 containers:


App Pod 1 → OK
App Pod 2 → CRASHED
App Pod 3 → OK


Kubernetes automatically:
  * Detects Pod 2 failure
  * Removes it
  * Creates a new Pod

👉 No human needed

---

===== 3. Need for scaling =====

Example:

During peak traffic:


Normal: 3 pods
High traffic: 10 pods needed


Kubernetes can:
  * Add more pods automatically (autoscaling)
  * Remove them when traffic decreases

---

===== 4. Need for reliability =====

Example:

If a server dies:


Node 1 (dead)
Node 2 (running)
Node 3 (running)


Kubernetes:
  * Moves workloads from Node 1 to other nodes

---

===== 5. Need for consistency =====

Example:

Same app in:
  * Dev
  * Staging
  * Production

Kubernetes ensures:
  * Same YAML works everywhere
  * Same behavior across environments

---

===== Summary =====

Kubernetes exists to make systems:
  * Reliable
  * Scalable
  * Self-healing
  * Automated