Notes

9. Secret

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🧠 Concept 9: Ingress (Advanced Networking + Routing 💯)

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🚀 1. Core Idea (1-line)

👉 Ingress exposes HTTP/HTTPS routes to services based on rules (domain/path)

🧠 2. Problem Without Ingress (VERY IMPORTANT ⚠️)

If you use only Services:

  • Each app needs separate LoadBalancer ❌

  • Expensive 💸

  • No smart routing ❌

💡 3. Solution = Ingress

👉 One entry point for all apps:

  • api.myapp.com → backend

  • app.myapp.com → frontend

  • /ml → ML service

👉 All handled via ONE load balancer

⚙️ 4. How Ingress Works (VERY IMPORTANT 🔥)

Ingress needs:

👉 1. Ingress Resource (rules)

  • Defines routing rules

👉 2. Ingress Controller (engine)

  • Actually applies rules

💡 Popular controller:

  • NGINX Ingress Controller

🔗 5. Flow (SUPER IMPORTANT 🔥)

User → Ingress → Service → Pod

🌐 6. Types of Routing

🟢 1. Host-based Routing

api.example.com → backend-service

🟣 2. Path-based Routing

/example → service-1  
/ml → service-2

📦 7. Example YAML

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  rules:
  - host: myapp.com
http:
  paths:
  - path: /api
pathType: Prefix
backend:
  service:
name: backend-service
port:
  number: 80

🔐 8. HTTPS / TLS Support (IMPORTANT)

Ingress can:

  • Terminate SSL

  • Use TLS certificates

👉 Production must have HTTPS

🔥 9. Real-world Example (DevOps / ML)

You deploy:

  • /api → backend

  • /ml → model service

  • / → frontend

👉 All via single Ingress
👉 Clean + cost efficient 💯

⚠️ 10. VERY IMPORTANT Clarification

❌ Ingress ≠ Service
❌ Ingress ≠ LoadBalancer

👉 It sits above Service

💼 11. Interview Answer

👉 “Ingress is a Kubernetes resource that manages external HTTP/HTTPS access to services using host and path-based routing, typically implemented via an Ingress Controller.”

⚡ 12. CKA Commands

kubectl get ingress
kubectl describe ingress <name>

🧠 13. Memory Trick

👉 Service = gives access
👉 Ingress = controls HOW access happens 🎯

🔥 14. Pro Insight (Real-world)

  • Use Ingress in production ALWAYS

  • Combine with:

  • TLS

  • Rate limiting

  • Auth

👉 Acts like API Gateway of K8s

🚀 Next Step

Bol:

👉 “next”

Then we go to:
🔥 Concept 10: StatefulSet (Databases + Stateful Apps 💯 — VERY IMPORTANT)

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