Kubernetes Ingress Controller & Gateway API EXPLAINED in the MOST SIMPLE WAY

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Key Topics Covered:

  • What is Ingress and why it’s used in Kubernetes
  • Role of Ingress Controller (e.g., NGINX, Traefik, HAProxy)
  • What is Gateway API, and Ingress Resource vs Gateway API: Differences in architecture, flexibility, and role-based separation
  • Key Gateway API components:
  • GatewayClass – Defines controller implementation
  • Gateway – Defines listener & network entry point
  • HTTPRoute, TLSRoute – Define routing rules
  • Benefits of Gateway API:
  • Standardization
  • Cross-vendor compatibility
  • Separation of concerns (infra vs app teams)

Read the full blog here:

Kubernetes Ingress & Gateway API – Smart Traffic Control

More Kubernetes Articles:

LearnXOps Kubernetes Articles

You Should Know:

1. Basic Kubernetes Ingress Setup with NGINX

Install NGINX Ingress Controller:

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/cloud/deploy.yaml

Verify Installation:

kubectl get pods -n ingress-nginx

Create a Sample Ingress Resource:

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

2. Gateway API Example

Install Gateway API CRDs:

kubectl apply -k "github.com/kubernetes-sigs/gateway-api/config/crd?ref=v1.0.0"

Define a Gateway:

apiVersion: gateway.networking.k8s.io/v1beta1 
kind: Gateway 
metadata: 
name: my-gateway 
spec: 
gatewayClassName: nginx 
listeners: 
- protocol: HTTP 
port: 80 
name: http 
allowedRoutes: 
namespaces: 
from: All

Define an HTTPRoute:

apiVersion: gateway.networking.k8s.io/v1beta1 
kind: HTTPRoute 
metadata: 
name: http-route 
spec: 
parentRefs: 
- name: my-gateway 
rules: 
- matches: 
- path: 
type: PathPrefix 
value: /test 
backendRefs: 
- name: test-service 
port: 80

3. Useful Commands for Debugging

  • Check Ingress Status: 
    kubectl get ingress
  • Describe Gateway API Resources: 
    kubectl describe gateway my-gateway
  • View Logs of Ingress Controller: 
    kubectl logs -n ingress-nginx deploy/ingress-nginx-controller

What Undercode Say:

Kubernetes Ingress and Gateway API simplify traffic management in cloud-native environments. While Ingress is widely adopted, Gateway API introduces better role separation and standardization. Mastering both is crucial for DevOps and Cloud Engineers.

Expected Output:

  • Successful deployment of NGINX Ingress Controller.
  • Properly configured Gateway and HTTPRoute.
  • Debugging insights from logs and kubectl describe.

Prediction:

Gateway API will gradually replace traditional Ingress due to its flexibility and standardization, becoming the default for Kubernetes traffic management in multi-cloud setups.

References:

Reported By: Sandip Das – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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