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

Listing snapshots


In the previous recipe, we create two snapshots of the same KVM instance: one internal and one disk-only, external snapshot. In this recipe, we are going to learn how to list existing snapshots.

Getting ready

For this recipe, we are going to need:

  • A libvirt host with the QEMU toolset
  • A running KVM instance
  • The snapshots we created in the Creating snapshots recipe

How to do it...

To list all existing snapshots, follow the next steps:

  1. List all snapshots for the specified KVM instance:
root@kvm:~# virsh snapshot-list kvm1
 Name                 Creation Time               State
------------------------------------------------------------
 1492797458           2017-04-21 17:57:38 +0000   running
 kvm1_ext_snapshot    2017-04-21 18:08:49 +0000   disk-snapshot

root@kvm:~#
  1. List only the disk-based snapshots:
root@kvm:~# virsh snapshot-list --disk-only kvm1
 Name                Creation Time              State
------------------------------------------------------------
 kvm1_ext_snapshot...