Book Image

The Kubernetes Bible

By : Nassim Kebbani, Piotr Tylenda, Russ McKendrick
4 (3)
Book Image

The Kubernetes Bible

4 (3)
By: Nassim Kebbani, Piotr Tylenda, Russ McKendrick

Overview of this book

With its broad adoption across various industries, Kubernetes is helping engineers with the orchestration and automation of container deployments on a large scale, making it the leading container orchestration system and the most popular choice for running containerized applications. This Kubernetes book starts with an introduction to Kubernetes and containerization, covering the setup of your local development environment and the roles of the most important Kubernetes components. Along with covering the core concepts necessary to make the most of your infrastructure, this book will also help you get acquainted with the fundamentals of Kubernetes. As you advance, you'll learn how to manage Kubernetes clusters on cloud platforms, such as Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP), and develop and deploy real-world applications in Kubernetes using practical examples. Additionally, you'll get to grips with managing microservices along with best practices. By the end of this book, you'll be equipped with battle-tested knowledge of advanced Kubernetes topics, such as scheduling of Pods and managing incoming traffic to the cluster, and be ready to work with Kubernetes on cloud platforms.
Table of Contents (28 chapters)
1
Section 1: Introducing Kubernetes
5
Section 2: Diving into Kubernetes Core Concepts
12
Section 3: Using Managed Pods with Controllers
17
Section 4: Deploying Kubernetes on the Cloud
21
Section 5: Advanced Kubernetes

The NodePort service

Now that we are aware of the theory behind the concept of services in Kubernetes, we will start by discovering the first type, which is NodePort.

NodePort is a Kubernetes service type designed to make Pods reachable from a port available on the host machine, the worker node. In this section, we're going to discover this type of port and be fully focused on NodePort services!

Why do you need NodePort services?

We're now going to discover exactly where the NodePort services sit and what they do in your Kubernetes cluster.

The first thing to understand is that NodePort services allow us to access a Pod running on a worker node, on a port of the worker node itself. After you expose Pods using the worker node, you'll be able to reach the Pods if you know the IP address of your worker node and the port of the NodePort service in this format:

<WORKER_NODE_IP_ADDRESS>:<PORT_DECLARED_IN_NODE_PORT_SVC>.

Let's illustrate...