Book Image

Kubernetes Cookbook - Second Edition

By : Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu
Book Image

Kubernetes Cookbook - Second Edition

By: Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu

Overview of this book

Kubernetes is an open source orchestration platform to manage containers in a cluster environment. With Kubernetes, you can configure and deploy containerized applications easily. This book gives you a quick brush up on how Kubernetes works with containers, and an overview of main Kubernetes concepts, such as Pods, Deployments, Services and etc. This book explains how to create Kubernetes clusters and run applications with proper authentication and authorization configurations. With real-world recipes, you'll learn how to create high availability Kubernetes clusters on AWS, GCP and in on-premise datacenters with proper logging and monitoring setup. You'll also learn some useful tips about how to build a continuous delivery pipeline for your application. Upon completion of this book, you will be able to use Kubernetes in production and will have a better understanding of how to manage containers using Kubernetes.
Table of Contents (11 chapters)

Working with labels and selectors

Labels are a set of key/value pairs, which are attached to object metadata. We could use labels to select, organize, and group objects, such as Pods, ReplicaSets, and Services. Labels are not necessarily unique. Objects could carry the same set of labels.

Label selectors are used to query objects with labels of the following types:

  • Equality-based:
    • Use equal (= or ==) or not-equal (!=) operators
  • Set-based:
    • Use in or notin operators

Getting ready

Before you get to setting labels in the objects, you should consider the valid naming convention of key and value.

A valid key should follow these rules:

  • A name with an optional prefix, separated by a slash.
  • A prefix must be...