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 2: Introduction to Microservices and Containers

Activity 2: Installing a WordPress Blog and Database Using Docker

Solution:

Perform the following steps to complete this activity:

  1. Create a folder named data. This folder will keep the stateful state of the database in the next steps:
    mkdir data
  2. Start a MySQL container using the official Docker image and the following specifications:

    Use the data folder from Step 1 as the database file. Publish port 3306 to the local system. Set the MYSQL_ROOT_PASSWORD environment variable as rootPassword. Set the MYSQL_DATABASE environment variable as database. Set the MYSQL_USER environment variable as user. Set the MYSQL_PASSWORD environment variable as password. Use mysql as the name of the container. Use the mysql:5.7 container image:

    docker run \
-v ${PWD} /data/:/var/lib/mysql \
-p 3306:3306 \
-e MYSQL_ROOT_PASSWORD=rootPassword \
-e MYSQL_DATABASE=database \
-e MYSQL_USER=user \
-e MYSQL_PASSWORD=password \
--name mysql...
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