What is Kubernetes NodePort? A Deep Dive into Exposing Services
Introduction TL;DR: The Kubernetes NodePort service exposes an application to external traffic by opening a specific port on every node in the cluster. It maps an external port (default range: 30000-32767) to an internal service’s port, allowing access via <NodeIP>:<NodePort>. NodePort is a straightforward way to expose services, primarily used for development, testing, or demo purposes, as it lacks the production-grade features of LoadBalancer or Ingress. The Kubernetes NodePort is a fundamental service type that provides external access to applications running within a cluster. In Kubernetes, Pods are ephemeral and have dynamic IP addresses, making direct access unreliable. Services solve this by providing a stable endpoint. A NodePort service builds upon the internal-only ClusterIP service by making that service accessible from outside the cluster through a static port on each worker node’s IP address. ...