In this post, we will learn how to configure a network on a Kubernetes cluster. We will learn about Kubernetes networking and will also read about the brief overview of Kubernetes pods and Kubernetes service.

This is one of the numerous posts by TechCommanders in a series for studying for the Certified Kubernetes Administrator (CKA) Exam.

What are Kubernetes Pods?

The pod is the smallest building block in a cluster. It represents the system that is running. The inside of a pod may have one or greater containers. A single pod has a-

• A unique network IP
• Storage
• Network
• Any other specification which you might have configured.

In simple words, the pod can be described as a logical host that is specific to your application and holds one or more tightly contained containers. The pod can also act as a constructor that calls or initializes a second container and as soon as the second container is up and running the first one stops its job.

What is the Kubernetes Service?

Kubernetes starts with a pod as earlier we had read that pod is the smallest building block thus it contains all the storage resources which are required to run a container application, multiple containers, or also as a singular network IP and operation options.

This gives more flexibility, but Pods don’t live forever. Even though every pod has a single IP, those can’t provide network stability over a long period of time.

We need to make sure that the application’s backend pods, as well as front-end pods, remain functional. This is where Kubernetes as a service also known as KAAS comes into play.

This is the method of how your team should organize, or service, pods, and therefore the policy by which your team accesses them. Often called a microservice, this organization depends on the spread of unique variables.

From the dimensions of your team to the traffic your application services, KaaS processes are often flexibly designed to fit your team’s needs.

So, now we are aware of Kubernetes pods as well as of service. Let’s jump into the working of networking in Kubernetes and how we can configure this.

Before we deep dive into the details of networking, we should go through the points which are covered in this post and the problems we are trying to solve. Majorly, there are three issues that we need to solve in the Kubernetes cluster

• Container to container communication
• Pod to pod communication
• Pod to service communication

#cka #development #kubernetes #devops #kubernetes-cluster