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

Complete deployment of the sample guestbook application

Having taken a detour to understand the dynamic configuration of applications using a ConfigMap, you will now return to the deployment of the rest of the guestbook application. You will once again come across the concepts of deployment, ReplicaSets, and pods. Apart from this, you will also be introduced to another key concept, called a service.

To start the complete deployment, we are going to create a service to expose the Redis master service.

Exposing the Redis master service

When exposing a port in plain Docker, the exposed port is constrained to the host it is running on. With Kubernetes networking, there is network connectivity between different pods in the cluster. However, pods themselves are ephemeral in nature, meaning they can be shut down, restarted, or even moved to other hosts without maintaining their IP address. If you were to connect to the IP of a pod directly, you might lose connectivity if that...