Book Image

Learning VMware vSphere

By : Rebecca Fitzhugh, Abhilash G B
Book Image

Learning VMware vSphere

By: Rebecca Fitzhugh, Abhilash G B

Overview of this book

Computer virtualization is a method to enable the running of multiple application workloads on a machine to achieve efficient utilization and reduce the number of physical machines in a data center. This has now become the foundation of many modern day data centers. What began as a technology to virtualize x86 architecture has now grown beyond the limits of a server’s hardware and into the realm of storage and network virtualization. VMware is currently the market leader in developing data center virtualization solutions. This book goes into the details of designing and implementing VMware solutions that form the foundation of a VMware infrastructure. The book begins by introducing you to the concepts of server virtualization followed by the architecture of VMware’s hypervisor – ESXi and then by its installation and configuration. You then learn what is required to manage a vSphere environment and configure advanced management capabilities of vCenter. Next you are taken through topics on vSphere Networking, Storage, ESXi Clustering, Resource Management and Virtual Machine Management. You will then be introduced to SSL Certificate Management and its use in a vSphere environment. Finally, you will learn about the lifecycle management of a vSphere environment by effectively monitoring, patching and upgrading vSphere components using Update Manager. By the end of the book, you will know how to use VMware’s vSphere suite of components to lay the foundation of a modern day virtual infrastructure.
Table of Contents (18 chapters)
Learning VMware vSphere
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface

The architecture of ESXi


Chapter 1, An Introduction to Server Virtualization using VMware, introduced you to the architecture of a type-1 hypervisor and the differences between ESX Classic (no longer developed) and ESXi, in terms of their architecture.

The ESXi hypervisor is made up of the VMkernel, the User World layer and the Virtual Machine Monitors. What these components provide is the foundation for other processes to enable core functionalities.

The VMkernel layer

VMkernel is a Posix-like operating system which is primarily responsible for resource scheduling. In an effort to allocate a fair share of the hardware resources between all the hosted virtual machines, it creates a level of abstraction so that the guest operating systems on the virtual machines can consume resources like they would do on a physical machine, without interfering in the operations of the guest operating systems running on other virtual machines. VMkernel includes a storage stack which supports the use of a proprietary...