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

Working with storage pools


Libvirt provides a centralized way of managing instance volumes (being image files or directories) by defining storage pools. A storage pool is a collection of volumes that then can be assigned to virtual machines and used to host their filesystems or added as additional block devices. The main benefits of using storage pools is the ability for libvirt to present and manage the given storage type to VMs in a centralized way.

As of this writing, the following storage pool backends are available:

  • Directory backend
  • Local filesystem backend
  • Network filesystem backend
  • Logical backend
  • Disk backend
  • iSCSI backend
  • SCSI backend
  • Multipath backend
  • RADOS block device backend
  • Sheepdog backend
  • Gluster backend
  • ZFS backend
  • Virtuozzo storage backend

In this recipe, we are going to create a directory-backed storage pool, move an existing image to it, and then provision a new KVM instance using the storage pool and volume.

Getting ready

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

  • The Debian...