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

What is ReplicaSet and how does it differ from ReplicationController?

Let's introduce another Kubernetes object: ReplicaSet. This is very closely related to ReplicationController, which we have just discussed. In fact, this is a successor to ReplicationController, which has a very similar specification API and capabilities. The purpose of ReplicaSet is also the same—it aims to maintain a fixed number of healthy, identical Pods (replicas) that fulfill certain conditions. So, again, you just specify a template for your Pod, along with appropriate label selectors and the desired number of replicas, and Kubernetes ReplicaSetController (this is the actual name of the controller responsible for maintaining ReplicaSet objects) will carry out the necessary actions to keep the Pods running.

Now, what are the differences between ReplicaSet and ReplicationController? We have summarized these here:

  • Most importantly, ReplicaSet allows more advanced, set-based (inclusion,...