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Kubernetes Design Patterns and Extensions
Kubernetes Design Patterns and Extensions

Kubernetes Design Patterns and Extensions: Enhance your container-cluster management skills and efficiently develop and deploy applications

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Kubernetes Design Patterns and Extensions

Kubernetes Client Libraries

Kubernetes provides multiple options for creating applications with the Kubernetes API. These options include tools such as kubectl, helm, kops, and kubeadm; and client libraries, which are officially supported or community-maintained. However, it is essential that you know the capabilities and boundaries of the clients in order to create applications that interact with Kubernetes.

In this chapter, you will learn how to access the Kubernetes API directly and use Kubernetes client libraries. Firstly, direct access to the Kubernetes API will be explained, and responses from the Kubernetes API will be demonstrated. Following that, official and community-maintained libraries will be given, including detailed information and example applications. Throughout this chapter, you'll develop applications that connect to the Kubernetes API, inside and outside...

Accessing the Kubernetes API

Kubernetes consists of several loosely-coupled components, with the principal idea of managing versioned resources. Kubernetes components can be divided into two sections: the control plane and node components. The control plane consists of the API Server, Controller Managers, and Schedulers. The API Server is the core management component and has the following functionalities:

  • Serves a REST API for the clients outside the cluster and Kubernetes components inside the cluster
  • Creates, deletes, and updates all of the Kubernetes resources, such as pods, deployments, and services
  • Stores the state of the objects in a distributed key/value store

Kubernetes API Style

The Kubernetes API is a RESTful...

Official Client Libraries

Applications that consume the Kubernetes REST API should implement API calls, including request and response types. Considering the rich set of Kubernetes resources that are provided to us, developing and maintaining API implementation becomes complex. Fortunately, Kubernetes has a rich set of official client libraries that are implemented in various programming languages. Client libraries do not only handle requests and responses, but also handle authentication to the API server. Besides, most of the client libraries can discover and connect to the Kubernetes API server if it is running inside the cluster.

In this section, official Go and Python client libraries will be presented. The client repositories, documentation, how to install, and how to create simple applications that are running inside and outside the clusters will be covered.

...

Community-Maintained Client Libraries

Kubernetes has an active and collaborative open source community, which has also increased its popularity. There are around 20 community-maintained client libraries that are listed in the Kubernetes documentation, which cover the following languages:

  • Clojure
  • Go
  • Java
  • Lisp
  • Node.js
  • Perl
  • PHP
  • Python
  • Ruby
  • Scala
  • dotNet
  • Elixir

There are some critical points to consider before using a community-maintained client library:

  • Aim of the library: It is crucial to consider the aim of the development team and library. Although it seems not directly related to the software itself, it affects how the client library is developed. For instance, some libraries focus on simplicity and compromise on capability coverage. If the vision of your application and the client library don't match, it would be difficult to maintain the application in the long run.
  • ...

Summary

In this chapter, Kubernetes API access and client libraries were discussed. Although there are various tools for communicating with Kubernetes, knowing the Kubernetes API itself and the client libraries is crucial for creating game-changing automation and orchestration tasks.
Firstly, the Kubernetes API style and how to connect using HTTP clients was presented. Following that, the client libraries of Kubernetes were covered, and we focused on two official client libraries. For both Go and Python, how to install, write code, package, and deploy this code into cluster steps was done with demonstrations and activities.
Finally, community-maintained libraries for different language preferences or custom requirements were shown. With the knowledge and hands-on experience of Kubernetes client libraries, higher levels of automation and extending Kubernetes is possible. In the...

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Key benefits

  • Implement best practices in cloud-native applications using Kubernetes
  • Explore the usage of client libraries and programmatic access to Kubernetes
  • Use your domain expertise to code

Description

Before plunging into how Kubernetes works, this book introduces you to the world of container orchestration and describes the recent changes in application development. You'll understand problems that Kubernetes solves and get to grips with using Kubernetes resources to deploy applications. In addition to this, you'll learn to apply the security model of Kubernetes clusters. Kubernetes Design Patterns and Extensions describes how services running in Kubernetes can leverage the platform's security features. Once you've grasped all this, you'll explore how to troubleshoot Kubernetes clusters and debug Kubernetes applications. You also discover how to analyze the networking model and its alternatives in Kubernetes, and apply best practices with design patterns. By the end of this book, you'll have studied all about using the power of Kubernetes for managing your containers.

Who is this book for?

Kubernetes Design Patterns and Extensions is for you if you are interested in configuring and troubleshooting Kubernetes clusters and developing microservices-based applications on Kubernetes clusters. DevOps engineers with basic knowledge of Docker will also find this book useful. It is assumed that you are comfortable using command-line tools and programming concepts and languages.

What you will learn

  • Understand and classify software designs as per the cloud-native paradigm
  • Apply best practices in Kubernetes with design patterns
  • Set up Kubernetes clusters in managed and unmanaged environments
  • Explore Kubernetes extension points
  • Extend Kubernetes with custom resources and controllers
  • Integrate dynamic admission controllers
  • Develop and run custom schedulers in Kubernetes
  • Analyze networking models in Kubernetes

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 27, 2018
Length: 106 pages
Edition : 1st
Language : English
ISBN-13 : 9781789615111
Vendor :
Google
Languages :
Tools :

What do you get with eBook?

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Product Details

Publication date : Sep 27, 2018
Length: 106 pages
Edition : 1st
Language : English
ISBN-13 : 9781789615111
Vendor :
Google
Languages :
Tools :

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Table of Contents

5 Chapters
Kubernetes Design Patterns Chevron down icon Chevron up icon
Kubernetes Client Libraries Chevron down icon Chevron up icon
Kubernetes Extensions Chevron down icon Chevron up icon
Solutions Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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He goes over and explains advanced patterns for Kubernetes.
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