Book Image

Puppet 5 Essentials - Third Edition

By : Martin Alfke, Felix Frank
Book Image

Puppet 5 Essentials - Third Edition

By: Martin Alfke, Felix Frank

Overview of this book

Puppet is a configuration management tool that allows you to automate all your IT configurations, giving you control over what you do to each Puppet Agent in a network, and when and how you do it. In this age of digital delivery and ubiquitous Internet presence, it's becoming increasingly important to implement scaleable and portable solutions, not only in terms of software, but also the system that runs it. This book gets you started quickly with Puppet and its tools in the right way. It highlights improvements in Puppet and provides solutions for upgrading. It starts with a quick introduction to Puppet in order to quickly get your IT automation platform in place. Then you learn about the Puppet Agent and its installation and configuration along with Puppet Server and its scaling options. The book adopts an innovative structure and approach, and Puppet is explained with flexible use cases that empower you to manage complex infrastructures easily. Finally, the book will take readers through Puppet and its companion tools such as Facter, Hiera, and R10k and how to make use of tool chains.
Table of Contents (10 chapters)

Setting defaults for resource parameters

Both exported and virtual resources are declared once, and are then collected in different contexts. The syntax is very similar, as are the concepts.

Sometimes, a central definition of a resource cannot be safely realized on all of your nodes, though; for example, consider the set of all your user resources. You will most likely wish to manage the user ID that is assigned to each account in order to make them consistent across your networks.

This is often solved through LDAP or similar directories, but that is not possible for some sites.

Even if all accounts on almost all machines will be able to use their designated ID, there are likely to be some exceptions. On a few older machines, some IDs are probably being used for other purposes already, which cannot be changed easily. On such machines, creating users with these IDs will fail.