Book Image

Getting Started with Containerization

By : Dr. Gabriel N. Schenker, Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu
Book Image

Getting Started with Containerization

By: Dr. Gabriel N. Schenker, Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu

Overview of this book

Kubernetes is an open source orchestration platform for managing containers in a cluster environment. This Learning Path introduces you to the world of containerization, in addition to providing you with an overview of Docker fundamentals. As you progress, you will be able to understand how Kubernetes works with containers. Starting with creating Kubernetes clusters and running applications with proper authentication and authorization, you'll learn how to create high-availability Kubernetes clusters on Amazon Web Services (AWS), and also learn how to use kubeconfig to manage different clusters. Whether it is learning about Docker containers and Docker Compose, or building a continuous delivery pipeline for your application, this Learning Path will equip you with all the right tools and techniques to get started with containerization. By the end of this Learning Path, you will have gained hands-on experience of working with Docker containers and orchestrators, including SwarmKit and Kubernetes. This Learning Path includes content from the following Packt products: • Kubernetes Cookbook - Second Edition by Hideto Saito, Hui-Chuan Chloe Lee, and Ke-Jou Carol Hsu • Learn Docker - Fundamentals of Docker 18.x by Gabriel N. Schenker
Table of Contents (25 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Index

Setting resources in nodes


Computing resource management is very important in any infrastructure. We should know our application well and preserve enough CPU and memory capacity to avoid running out of resources. In this section, we'll introduce how to manage node capacity in Kubernetes nodes. Furthermore, we'll also describe how to manage pod computing resources.

Kubernetes has the concept of resource Quality of Service (QoS). It allows an administrator to prioritize pods to allocate resources. Based on the pod's setting, Kubernetes classifies each pod as one of the following: 

  • Guaranteed pod
  • Burstable pod
  • BestEffort pod

The priority is Guaranteed > Burstable > BestEffort. For example, if a BestEffort pod and a Guaranteed pod exist in the same Kubernetes node, and that node encounters CPU problems or runs out of memory, the Kubernetes master terminates the BestEffort pod first. Let's take a look at how it works.

Getting ready

There are two ways to set a Resource QoS: pod configuration or...