Book Image

Mastering PowerCLI

By : Sajal Debnath
Book Image

Mastering PowerCLI

By: Sajal Debnath

Overview of this book

Have you ever wished that every morning you could automatically get a report with all the relevant information about your datacenter in exactly the same format you want? Or whether you could automate that boring, exhausting task? What if some crucial task needs to be performed on a regular basis without any error? PowerCLI scripts do all that and much more for VMware environments. It is built on top of the popular Windows PowerShell, with which you can automate server tasks and reduce manual input, allowing you to focus on more important tasks. This book will help you to achieve your goals by starting with a short refresher on PowerShell and PowerCLI and then covering the nuances of advanced functions and reusable scripts. Next you will learn how to build a vSphere-powered virtualized datacenter using PowerCLI while managing different aspects of the environment including automated installation, network, and storage. You will then manage different logical constructs of vSphere environment and different aspects of a virtual machine. Later, you will implement the best practices for a security implementation in vSphere Environment through PowerCLI before discovering how to manage other VMware environments such as SRM, vCloud Director and vCloud Air through PowerCLI. You will also learn to manage vSphere environments using advanced properties by accessing vSphere API and REST APIs through PowerCLI. Finally, you will build a Windows GUI application using PowerShell followed by a couple of sample scripts for reporting and managing vSphere environments with detailed explanations of the scripts. By the end of the book, you will have the required in-depth knowledge to master the art of PowerCLI scripting.
Table of Contents (21 chapters)
Mastering PowerCLI
Credits
Foreword
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Preface
Index

Dynamic parameters


All the earlier examples were examples of static parameters. Before the cmdlets of the function are executed, these parameters come into existence and remain available for the entire duration of the scope of the function. Dynamic parameters are those parameters that are defined in such a way that depending on certain conditions only, they come into existence. It may be designed in such a way that a dynamic parameter will come into existence only when another parameter is used in the function or a parameter has a certain value. So, late binding is applied for these types of parameters.

For example, let's discuss the following requirements:

  • We want to create a VM, provided the VM name is given by a user.

  • We have three different environments named Dedicated, Shared, and Cloud where the VM can be created.

  • If any environment is not mentioned by a user, then by default the VM will be created in the shared environment.

  • For a shared and Cloud environment, providing a VM name would...