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

Simple KVM backups with tar and rsync


In this recipe, we are going to create a backup of a KVM instance using tar and rsync and store it on a remote server. This is the easiest way to backup a KVM instance. In the next few recipes, we are going to create snapshots and use them as a cold backup.

Getting ready

For this extremely simple recipe, we are going to need:

  • A libvirt host with a running KVM instance, using an image file as its backing store
  • The tar and rsync Linux utilities
  • A remote server to transfer the backup

How to do it...

To back up a virtual machine using tar and rsync, perform the following steps:

  1. Create the backup directory and change to it:
root@kvm:~# mkdir backup_kvm1 && cd backup_kvm1
root@kvm:~/backup_kvm1#
  1. Find the location of the image file of the KVM guest:
root@kvm:~/backup_kvm1# virsh dumpxml kvm1 | grep "source file"
 <source file='/var/lib/libvirt/images/kvm1.img'/>
root@kvm:~/backup_kvm1#
  1. Save the current instance configuration to disk:
root@kvm:~/backup_kvm1...