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--- k8s:core:why_k8s [2026/05/31 02:45] – phong2018
+++ k8s:core:why_k8s [2026/05/31 02:47] (current) – phong2018
@@ Line 26: / Line 26: @@
 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