Book Image

Learning PowerShell DSC - Second Edition

By : James Pogran
Book Image

Learning PowerShell DSC - Second Edition

By: James Pogran

Overview of this book

The main goal of this book is to teach you to configure, deploy, and manage your system using the new features of PowerShell v5/v6 DSC. This book begins with the basics of PowerShell Desired State Configuration, covering its architecture and components. It familiarizes you with the set of Windows PowerShell language extensions and new Windows PowerShell commands that make up DSC. Then it helps you create DSC custom resources and work with DSC configurations with the help of practical examples. Finally, it describes how to deploy configuration data using PowerShell DSC. Throughout this book, we will be focusing on concepts such as building configurations with parameters, the local configuration manager, and testing and restoring configurations using PowerShell DSC. By the end of the book, you will be able to deploy a real-world application end-to-end and will be familiar enough with the powerful Desired State Configuration platform to achieve continuous delivery and efficiently and easily manage and deploy data for systems.
Table of Contents (9 chapters)

Configuration management refresher

A few weeks pass and you get an escalation call from the application team that your DSC stuff broke their application. A few minutes of investigation using the xDSCResourceDiagnostics module shows successful DSC executions that detected configuration drift and corrected it. After showing this to the application team, they eventually admit that they updated the configuration file used by the Apollo application with different values without telling you since they were used to deploying the application themselves.

Since you had set the LCM to ApplyAndAutoCorrect, DSC had detected the content difference in the file specified in $Node.Apollo.ConfigFilePath and changed it back to the value you specified in $Node.Apollo.ConfigFileContents in the DSC configuration data file, just like it was designed to do. The application team didn't think that...