Book Image

Hands-on Kubernetes on Azure, Third Edition - Third Edition

By : Nills Franssens, Shivakumar Gopalakrishnan, Gunther Lenz
Book Image

Hands-on Kubernetes on Azure, Third Edition - Third Edition

By: Nills Franssens, Shivakumar Gopalakrishnan, Gunther Lenz

Overview of this book

Containers and Kubernetes containers facilitate cloud deployments and application development by enabling efficient versioning with improved security and portability. With updated chapters on role-based access control, pod identity, storing secrets, and network security in AKS, this third edition begins by introducing you to containers, Kubernetes, and Azure Kubernetes Service (AKS), and guides you through deploying an AKS cluster in different ways. You will then delve into the specifics of Kubernetes by deploying a sample guestbook application on AKS and installing complex Kubernetes apps using Helm. With the help of real-world examples, you'll also get to grips with scaling your applications and clusters. As you advance, you'll learn how to overcome common challenges in AKS and secure your applications with HTTPS. You will also learn how to secure your clusters and applications in a dedicated section on security. In the final section, you’ll learn about advanced integrations, which give you the ability to create Azure databases and run serverless functions on AKS as well as the ability to integrate AKS with a continuous integration and continuous delivery (CI/CD) pipeline using GitHub Actions. By the end of this Kubernetes book, you will be proficient in deploying containerized workloads on Microsoft Azure with minimal management overhead.
Table of Contents (22 chapters)
1
Foreword
Free Chapter
2
Section 1: The Basics
5
Section 2: Deploying on AKS
11
Section 3: Securing your AKS cluster and workloads
16
Section 4: Integrating with Azure managed services
21
Index

Installing complex Kubernetes applications using Helm

In the previous section, you used static YAML files to deploy an application. When deploying more complicated applications, across multiple environments (such as dev/test/prod), it can become cumbersome to manually edit YAML files for each environment. This is where the Helm tool comes in.

Helm is the package manager for Kubernetes. Helm helps you deploy, update, and manage Kubernetes applications at scale. For this, you write something called Helm Charts.

You can think of Helm Charts as parameterized Kubernetes YAML files. If you think about the Kubernetes YAML files we wrote in the previous section, those files were static. You would need to go into the files and edit them to make changes.

Helm Charts allow you to write YAML files with certain parameters in them, which you can dynamically set. This setting of the parameters can be done through a values file or as a command-line variable when you deploy the chart.

Finally...