Book Image

KVM Virtualization Cookbook

By : Konstantin Ivanov
Book Image

KVM Virtualization Cookbook

By: Konstantin Ivanov

Overview of this book

Virtualization technologies such as KVM allow for better control over the available server resources, by deploying multiple virtual instances on the same physical host, or clusters of compute resources. With KVM it is possible to run various workloads in isolation with the hypervisor layer providing better tenant isolation and higher degree of security. This book will provide a deep dive into deploying KVM virtual machines using qemu and libvirt and will demonstrate practical examples on how to run, scale, monitor, migrate and backup such instances. You will also discover real production ready recipes on deploying KVM instances with OpenStack and how to programatically manage the life cycle of KVM virtual machines using Python. You will learn numerous tips and techniques which will help you deploy & plan the KVM infrastructure. Next, you will be introduced to the working of libvirt libraries and the iPython development environment. Finally, you will be able to tune your Linux kernel for high throughput and better performance. By the end of this book, you will gain all the knowledge needed to be an expert in working with the KVM virtualization infrastructure.
Table of Contents (15 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Building a simple REST API server with libvirt and bottle


In this recipe, we are going to use all of the libvirt methods we saw in the earlier recipes to build a simple RESTfull API server, leveraging the bottle micro framework for Python.

Bottle is described as a fast and simple Web Server Gateway Interface (WSGI) micro web-framework for Python, which is distributed as a single module file.

Note

For more information on the bottle micro framework please visit the official website at: https://bottlepy.org/docs/dev/.

The simple API server we are implementing, will accept the following requests:

  • list: get method that lists all defined libvirt instances.
  • define: post method used to define a new KVM instance. We are going to provide the XML definition as a header in the post request.
  • start: post method to start an instance. The name of the instance will be provided in the header of the request.
  • stop: post method to spot a KVM instance.
  • undefine: post method to delete the instance.

Getting ready

For this...