How do Kubernetes Services (ClusterIP, NodePort, LoadBalancer) and Ingress work?

Explanation & Concept

Because Pods are ephemeral and their IP addresses change on restart, **Services** provide stable IP addresses and DNS names to load-balance traffic across pods matching a label selector:

• ClusterIP (default): Internal virtual IP accessible only within the cluster. • NodePort: Exposes the service on a static high port (30000–32767) on every cluster node's IP. • LoadBalancer: Provisions a cloud provider load balancer (AWS ALB, GCP Cloud LB). • Ingress: An API object that manages HTTP/HTTPS routing, SSL termination, and host/path-based routing to internal Services.

Code Example

yaml

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

How It Works & Key Takeaways

Ingress acts as a smart reverse proxy, routing external domains and URL paths to internal ClusterIP services without paying for a separate cloud load balancer per service.

Mock Test · 1 Questions · Optional

Ready for Scaling & Helm?

Take a quick test to evaluate yourself, or move straight to the next module.

Beginner1 questions

Skip

Services & IngressBeginner

1Question 1 of 1

yaml

How do Kubernetes Services (ClusterIP, NodePort, LoadBalancer) and Ingress work?

Explanation & Concept

Because Pods are ephemeral and their IP addresses change on restart, **Services** provide stable IP addresses and DNS names to load-balance traffic across pods matching a label selector:

Code Example

yaml

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

How It Works & Key Takeaways

Ingress acts as a smart reverse proxy, routing external domains and URL paths to internal ClusterIP services without paying for a separate cloud load balancer per service.

Mock Test · 1 Questions · Optional

Ready for Scaling & Helm?

Take a quick test to evaluate yourself, or move straight to the next module.

Beginner1 questions

Skip