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Becoming KCNA Certified

Becoming KCNA Certified

By : Dmitry Galkin
5 (6)
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Becoming KCNA Certified

Becoming KCNA Certified

5 (6)
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)
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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

Summary

In this chapter, we finally got our hands on Kubernetes. We learned a lot about its architecture, components, and API. Kubernetes clusters consist of control plane (also known as the master) and worker nodes, where control plane nodes run K8s management components and worker nodes run the actual containerized applications with the help of kubelet, container runtime, and kube-proxy. Among the master node components, there’s kube-apiserver, etcd, kube-scheduler, kube-controller-manager, and, optionally, cloud-controller-manager.

We saw that a pod is the smallest deployable unit of Kubernetes and that it allows us to run individual containers as well as multiple containers together on K8s. Containers inside one pod are coupled and can share storage, network, and memory. The secondary container in the pod is typically called the sidecar and can help the container run the main application by doing log aggregation, for example.

The Kubernetes API is declarative. When...

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