Book Image

Introduction to DevOps with Kubernetes

By : Onur Yılmaz, Süleyman Akba≈ü
Book Image

Introduction to DevOps with Kubernetes

By: Onur Yılmaz, Süleyman Akba≈ü

Overview of this book

Kubernetes and DevOps are the two pillars that can keep your business at the top by ensuring high performance of your IT infrastructure. Introduction to DevOps with Kubernetes will help you develop the skills you need to improve your DevOps with the power of Kubernetes. The book begins with an overview of Kubernetes primitives and DevOps concepts. You'll understand how Kubernetes can assist you with overcoming a wide range of real-world operation challenges. You will get to grips with creating and upgrading a cluster, and then learn how to deploy, update, and scale an application on Kubernetes. As you advance through the chapters, you’ll be able to monitor an application by setting up a pod failure alert on Prometheus. The book will also guide you in configuring Alertmanager to send alerts to the Slack channel and trace down a problem on the application using kubectl commands. By the end of this book, you’ll be able to manage the lifecycle of simple to complex applications on Kubernetes with confidence.
Table of Contents (11 chapters)

Chapter 6: Configuration and Storage Management in Kubernetes

Activity 6: Updating Configurations on the Fly


Perform the following steps to complete this activity:

  1. We created a ConfigMap named app-config and a secret named token earlier in the chapter. Please include them in your solution. Create a pod definition file that consumes this ConfigMap and the secret:
    apiVersion: v1
    kind: Pod
      name: config-secret-pod
      - name: content
        image: busybox
        command: [ "sh", "-c"]
        - while true; do
            echo -en '\n';
            echo Current environment is 'cat /configurations/environment';
            echo Used token is 'cat /secrets/token';
            sleep 10;
        - name: config-volume
          mountPath: "/configurations"
        - name: secret-volume
          mountPath: "/secrets"
      - name: config-volume