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

Autoscaling

Autoscaling is the ability of applications and infrastructure to automatically grow and shrink to meet demand.

Three things are vital for autoscaling to be truly cloud native.

  • Applications and infrastructure need to be able to scale
  • Scaling has to be automatic
  • Scaling has to be up and down

Kubernetes has the ability to scale applications up and down based on current workload. It can use simple metrics, such as CPU and memory consumption, or it can use application-specific metrics such as queue size and request response times.

A simple example might be the reporting microservice of an application. If business units are running end-of-year reports and the reporting microservice is experiencing a 10x increase in demand, Kubernetes can spin-up additional reporting containers to meet demand. When demand decreases, Kubernetes can terminate the additional containers. If the application is running on a public cloud, Kubernetes can also scale-up the infrastructure to help...