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NodePort service type

NodePort is a service type in Kubernetes that exposes an application on each Node's IP at a static port, allowing external traffic to reach the service^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md].

Creation and Syntax

To create a NodePort service, the --type=NodePort flag is used with the kubectl expose command^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md].

shell [kubectl](<./kubectl.md>) expose deploy nginx-deployment --port=8000 --target-port=80 --type=NodePort^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md]

This configuration creates a service that listens on a specific port on the cluster nodes and forwards traffic to the target-port of the associated Pods^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md].

Ports and Networking

When a NodePort service is created, Kubernetes allocates a specific port in the 30000-32767 range (e.g., 30427) on every node in the cluster^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md]. The service listing displays the port mapping as PORT:SVC_PORT/TCP (e.g., 8000:30427/TCP)^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md].

The service remains accessible via the internal ClusterIP (e.g., 10.96.130.250) while also exposing the external entry point^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md]. Like other service types, it performs load balancing across the selected backend Pods^[400-devops__06-Kubernetes__k8s-learning__05.service__service.md].

Sources

  • 400-devops__06-Kubernetes__k8s-learning__05.service__service.md