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Nodeport service Kubernetes & more

by | Nov 17, 2021

All about Nodeport service Kubernetes and more in detail from our in-house experts.

If you are new to the world of Kubernetes, we are here to help you out. Our Support Team is well-versed in answering queries big and small as a part of our Server Management Services.

Today, let’s take a look at Kubernetes node services and more.

What is Nodeport service in Kubernetes?

A NodePort is an open port on every nodule of the cluster. It transparently routes incoming traffic to your service, in spite of the fact that your application may be running on a different node.

Moreover, a NodePort is usually assigned from a pool of cluster-configured NodePort ranges between 30000 to 32767.

A service is a collection of pods running on the cluster. Furthermore, services are comparatively “cheap”. They enable you to have many services within your cluster.

Interestingly, Kubernetes services can also power a microservice architecture. It is also important to note that each service comes with a pod label query which defines the pods that are ready to process data for the service.

If you are wondering what is the difference between NodePort and ClusterIP, you have come to the right place.

NodePort exposes the service in every Node’s IP at a static port and the ClusterIP service is automatically created when the NodePort service routes to it. ClusterIP is created inside a cluster and is accessible only by other pods in the same cluster.

This service type is used when a service has to be exposed to other pods in the same cluster. Additionally, the external load balancer routes to NodePort and ClusterIP services.

How to access a service in Kubernetes?

  1. First, run a pod and connect to a shell in it via kubectl exec.
  2. Then, connect to other pods, nodes, and services from the shell.
  3. A few clusters will allow you to ssh to a node in the cluster. This will allow you to access cluster services.

What is Kubernetes API server?

The Kubernetes API server is the central touch point. It is accessed by all automations, users as well as components in the Kubernetes cluster. Moreover, it implements a RESTful API over HTTP and performs all API operations. It is also responsible for securing API objects into a persistent storage backend.

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To summarize, we learned about NodePort services and what they do. The Support Techs also demonstrated how to access a pod or a node in the cluster.


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