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

Chapter 8. Virtual Machines Concepts and Management

A virtual machine is a set of virtual hardware whose characteristics are determined by a set of encapsulated files; it is this virtual hardware that a guest operating system is installed on. A virtual machine runs an operating system and a set of applications in a similar fashion to a physical server. Essentially, a virtual machine is comprised of configuration files and its physical resources are provided by an ESXi host.

Virtual machines are created within a virtualization layer, and this virtualization layer manages requests from the virtual machine for resources such as CPU or memory. It is this virtualization layer that is responsible for translating these requests to the underlying physical hardware.

Each virtual machine is granted a portion of the physical hardware. All VMs have their own virtual hardware (there are important ones to note, called the core 4: CPU, memory, disk, and network). Each VM is isolated from the other and each...