Book Image

Mastering Kubernetes - Second Edition

By : Gigi Sayfan
Book Image

Mastering Kubernetes - Second Edition

By: Gigi Sayfan

Overview of this book

Kubernetes is an open source system that is used to automate the deployment, scaling, and management of containerized applications. If you are running more containers or want automated management of your containers, you need Kubernetes at your disposal. To put things into perspective, Mastering Kubernetes walks you through the advanced management of Kubernetes clusters. To start with, you will learn the fundamentals of both Kubernetes architecture and Kubernetes design in detail. You will discover how to run complex stateful microservices on Kubernetes including advanced features such as horizontal pod autoscaling, rolling updates, resource quotas, and persistent storage backend. Using real-world use cases, you will explore the options for network configuration, and understand how to set up, operate, and troubleshoot various Kubernetes networking plugins. In addition to this, you will get to grips with custom resource development and utilization in automation and maintenance workflows. To scale up your knowledge of Kubernetes, you will encounter some additional concepts based on the Kubernetes 1.10 release, such as Promethus, Role-based access control, API aggregation, and more. By the end of this book, you’ll know everything you need to graduate from intermediate to advanced level of understanding Kubernetes.
Table of Contents (16 chapters)

Extending the Kubernetes API

Kubernetes is an extremely flexible platform. It allows you to extend its own API with new types of resources called custom resources. If that is not enough you can even provide your API server that integrates with the Kubernetes API server in a mechanism called API aggregation. What can you do with custom resources? Plenty. You can use them to manage the Kubernetes API resources that live outside the Kubernetes cluster, which your pods communicate with.

By adding those external resources as custom resources, you get a full picture of your system and you benefit from many Kubernetes API features such as the following:

  • Custom CRUD REST endpoints
  • Versioning
  • Watches
  • Automatic integration with generic Kubernetes tooling

Other use cases for custom resources are metadata for custom controllers and automation programs.

Custom resources that were introduced...