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

Sharing directories between a running VM and the host OS


In the previous recipe, we saw two examples on how to attach disks to a running KVM instance. In this recipe, we are going to share a directory from the host OS and make it available in the virtual machine. We can only perform this action on a stopped instance however. If you've been following along, you should already have a libvirt KVM instance that you can use.

Getting ready

The prerequisites for this recipe are as follows:

  • Stopped libvirt KVM instance with console access
  • A guest OS with the 9p and virtio kernel modules (available on most Linux distributions by default)

How to do it...

To share a directory from the host OS to the KVM guest, execute the following:

  1. Create a new directory on the host OS and add a file to it:
root@kvm:~# mkdir /tmp/shared
root@kvm:~# touch /tmp/shared/file
root@kvm:~#
  1. Add the following definition to the stopped KVM instance:
root@kvm:~# virsh edit kvm1
 ...
 <devices>
   ...
   <filesystem type='mount...