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
About the Author
About the Reviewer
Customer Feedback

Manual offline migration using GlusterFS shared volumes

In the Manual offline migration using an iSCSI storage pool recipe, we created an iSCSI storage pool and used it while performing manual offline migration. With storage pools, we can delegate the operation of a shared storage to libvirt rather than manually having to log in/log out iSCSI targets, for example. This is especially useful when we perform live migrations with the virsh command, as we are going to see in the next recipe. Even though the use of storage pools is not required, it simplifies and centralizes the management of backend volumes.

In this recipe, we are going to use the GlusterFS network filesystem to demonstrate an alternative way of manually migrating a KVM instance, this time not using storage pools.

GlusterFS has the following two components:

  • Server component: This runs the GlusterFS daemon and exports local block devices named bricks as volumes that can be mounted by the client component
  • Client component: This connects...