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
About the Author
About the Reviewer
Customer Feedback

Manipulating network interfaces

Libvirt provides a handy way to manage network interfaces on the host through the already familiar XML definition syntax. We can use the virsh command to define, provision, and delete Linux bridges and obtain more information about existing network interfaces, as you've already seen in this chapter.

In this recipe, we are going to define a new Linux bridge, create it, and finally remove it using virsh. If you recall from earlier recipes, we can manipulate the Linux bridge through utilities such as brctl. With libvirt, however, we have a way to control this programmatically by writing the definition file and using the API bindings, as we'll see in Chapter 7, Using Python to Build and Manage KVM Instances.

Getting ready

For this recipe, we are going to need the following:

  • The libvirt package installed on the host
  • A Linux host with the bridge kernel module

How to do it...

To create a new bridge interface using libvirt, run the following commands:

  1. Create a new bridge...