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

Metrics reported by Kubernetes

Kubernetes reports multiple metrics. In this section, you'll first use a number of kubectl commands to get these metrics. Afterward, you'll look into Azure Monitor for containers to see how Azure helps with container monitoring.

Node status and consumption

The nodes in your Kubernetes are the servers running your application. Kubernetes will schedule pods to different nodes in the cluster. You need to monitor the status of your nodes to ensure that the nodes themselves are healthy and that the nodes have enough resources to run new applications.

Run the following command to get information about the nodes on the cluster:

kubectl get nodes

The preceding command lists their name, status, and age:

Running the kubectl get nodes command to get information about the nodes on the cluster

Figure 7.24: There are two nodes in this cluster

You can get more information by passing the -o wide option:

kubectl get -o wide nodes

The output lists the underlying OS-IMAGE and INTERNAL-IP, and other...