Book Image

The KCNA Book

By : Nigel Poulton
Book Image

The KCNA Book

By: Nigel Poulton

Overview of this book

There is a huge benefit in building small, specialized, single-purpose apps that can self-heal, auto scale, and update regularly without needing downtime. Kubernetes and cloud-native technologies come in handy in building such apps. Possessing the knowledge and skills to leverage Kubernetes can positively enhance possibilities in favor of architects who specialize in cloud-native microservices applications. ‘The KCNA Book’ is designed to help those working in technology with a passion to become certified in the Kubernetes and Cloud-Native Associate Exam. You will learn about containerization, microservices, and cloud-native architecture. You will learn about Kubernetes fundamentals and container orchestration. The book also sheds light on cloud-native application delivery and observability. It focuses on the KCNA exam domains and competencies, which can be applied to the sample test included in the book. Put your knowledge to the test and enhance your skills with the all-encompassing topic coverage. Upon completion, you will begin your journey to get the best roles, projects, and organizations with this exam-oriented book.
Table of Contents (12 chapters)
9
8: Sample test
Appendix B: Sample Test answers

Chapter summary

Kubernetes is a container orchestrator originally developed at Google and open-sourced and donated to the CNCF in 2014. It was the first project to graduate the CNCF and is now the industry-standard orchestrator and second biggest project on GitHub. It can also orchestrate virtual machines and serverless functions.

A Kubernetes cluster consists of one or more control plane nodes and one or more worker nodes. Control plane nodes run the API server, cluster store, scheduler, controllers, and the API itself. Worker nodes are where user applications run and have a kubelet, container runtime, and kube-proxy.

The API server exposes the API over a RESTful HTTPS interface and requires high-performance control plane nodes. All internal and external Kubernetes traffic goes through the API server. The cluster store is the only stateful part of the control plane and is where the state of the cluster and applications is persisted. The scheduler assigns pods to worker nodes, and...