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

Deleting snapshots


In this quick recipe, we are going to delete the snapshots we created earlier in the Creating snapshots recipe, using libvirt.

Getting ready

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

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

How to do it...

To delete a snapshot, follow these steps:

  1. List all snapshots present on the host:
root@kvm:~# virsh snapshot-list kvm1
 Name                      Creation Time             State
------------------------------------------------------------
 1492797458                2017-04-21 17:57:38 +0000 running
 1492802417                2017-04-21 19:20:17 +0000 running
 kvm1_ext_snapshot_renamed 2017-04-21 18:08:49 +0000 disk-snapshot

root@kvm:~#
  1. Delete the latest snapshot based on the creation time:
root@kvm:~# virsh snapshot-delete kvm1 --snapshotname 1492802417
Domain snapshot 1492802417 deleted

root@kvm:~#
  1. List the remaining snapshots:
root@kvm:~# virsh snapshot-list kvm1
 Name   ...