Book Image

Becoming KCNA Certified

By : Dmitry Galkin
Book Image

Becoming KCNA Certified

By: Dmitry Galkin

Overview of this book

The job market related to the cloud and cloud-native technologies is both growing and becoming increasingly competitive, making certifications like KCNA a great way to stand out from the crowd and learn about the latest advancements in cloud technologies. Becoming KCNA Certified doesn't just give you the practical skills needed to deploy and connect applications in Kubernetes, but it also prepares you to pass the Kubernetes and Cloud Native Associate (KCNA) exam on your first attempt. The book starts by introducing you to cloud-native computing, containers, and Kubernetes through practical examples, allowing you to test the theory out for yourself. You'll learn how to configure and provide storage for your Kubernetes-managed applications and explore the principles of modern cloud-native architecture and application delivery, giving you a well-rounded view of the subject. Once you've been through the theoretical and practical aspects of the book, you'll get the chance to test what you’ve learnt with two mock exams, with explanations of the answers, so you'll be well-prepared to appear for the KCNA exam. By the end of this Kubernetes book, you'll have everything you need to pass the KCNA exam and forge a career in Kubernetes and cloud-native computing.
Table of Contents (22 chapters)
1
Part 1: The Cloud Era
4
Part 2: Performing Container Orchestration
7
Part 3: Learning Kubernetes Fundamentals
12
Part 4: Exploring Cloud Native
16
Part 5: KCNA Exam and Next Steps

Kubernetes architecture

As you already know, Kubernetes is used to orchestrate fleets of containers that run on multiple servers that make up a Kubernetes cluster. Those servers are often called nodes, and nodes can be virtual machines running on-premises, in the cloud, or bare-metal servers. You can even combine different nodes in one Kubernetes cluster (for example, several nodes represented by VMs plus a few others as bare-metal servers).

There are two distinguished node types in Kubernetes:

  • Control plane nodes (sometimes also called master nodes)
  • Worker nodes

It is the worker nodes where the containerized applications run, and it is the control plane nodes where the K8s cluster management components run. We can see this in more detail in Figure 5.1.

Figure 5.1 – Kubernetes components

Figure 5.1 – Kubernetes components

Control plane nodes run several specialized K8s services and make global decisions about the Kubernetes cluster, such as scheduling containerized...