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.

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Table of Contents (11 chapters)
Preface
About
About the Book
Free Chapter
1
Chapter 1: Introduction to DevOps
Chapter 1: Introduction to DevOps
Learning Objectives
Introduction
The DevOps Toolchain
Summary
2
Chapter 2: Introduction to Microservices and Containers
Chapter 2: Introduction to Microservices and Containers
Learning Objectives
Introduction
Introduction to Docker
Building Docker Images
Running Docker Containers
Summary
3
Chapter 3: Introduction to Kubernetes
Chapter 3: Introduction to Kubernetes
Learning Objectives
Introduction
Kubernetes Architecture
Accessing Kubernetes Clusters
Fundamental Kubernetes Resources
Summary
4
Chapter 4: Creating a Kubernetes Cluster
Chapter 4: Creating a Kubernetes Cluster
Learning Objectives
Introduction
Manual Kubernetes Cluster Setup
Kubernetes Cluster Considerations
Kubernetes Platform Options
Summary
5
Chapter 5: Deploy an Application to Kubernetes
Chapter 5: Deploy an Application to Kubernetes
Learning Objectives
Introduction
Object Management in Kubernetes
Service Discovery in Kubernetes
Kubernetes Package Manager: Helm
Summary
6
Chapter 6: Configuration and Storage Management in Kubernetes
Chapter 6: Configuration and Storage Management in Kubernetes
Learning Objectives
Configuration Management
Configuration Management in Kubernetes
Secret Management
Secret Management Best Practices
Storage Management
Storage Management in Kubernetes
Activity 7: Running a Persistent Database on Kubernetes
Summary
7
Chapter 7: Updating and Scaling an Application in Kubernetes
Chapter 7: Updating and Scaling an Application in Kubernetes
Learning Objectives
Updating an Application
Updating an Application in Kubernetes
Scaling an Application in Kubernetes
Summary
8
Chapter 8: Troubleshooting Applications in Kubernetes
Chapter 8: Troubleshooting Applications in Kubernetes
Learning Objectives
Introduction
Troubleshooting
Troubleshooting Applications in Kubernetes
Summary
9
Chapter 9: Monitoring Applications in Kubernetes
Chapter 9: Monitoring Applications in Kubernetes
Learning Objectives
Monitoring
Monitoring Applications in Kubernetes
Custom Metrics
Exposed Metrics in Kubernetes
Summary
Appendix
About
Chapter 1: Introduction to DevOps
Chapter 2: Introduction to Microservices and Containers
Chapter 3: Introduction to Kubernetes
Chapter 4: Creating a Kubernetes Cluster
Chapter 5: Deploy an Application to Kubernetes
Chapter 6: Configuration and Storage Management in Kubernetes
Chapter 7: Updating and Scaling an Application in Kubernetes
Chapter 8: Troubleshooting Applications in Kubernetes
Chapter 9: Monitoring Applications in Kubernetes

Chapter 3: Introduction to Kubernetes

Activity 3: Installing a WordPress Blog and Database on Kubernetes

Solution:

Perform the following steps to complete this activity:

  1. Create a two-container stateful set definition inside the wordpress-database.yaml file with the following specifications:

    The nme should be wordpress-database and the replica count should be set to 1. The database container should have the name of database and use the container image of mysql:5.7. Publish the container to port 3306 and mount the data volume to the /var/lib/mysql path. In addition, set the following environment variables:

    Figure 3.24: Environment variables

    Create a blog container with the name blog using the latest WordPress container image and publish the container to port 80. In addition, set the following environment variables:

    Figure 3.25: Environment variables

    Include a volume claim with the name data and 1GB storage.

    The stateful set description as YAML for the specification is as follows...

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