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)

Performance optimizations

Operating a Puppet master gives you numerous benefits over just using puppet apply on all your machines. This comes at a cost, of course. The master and agents form a server/client relation, and, as with most such constructs, the server can become the bottleneck.

The good news is that the Puppet agent is a fat client. The major share of the work inspecting file contents, interfacing with the package-management subsystem, services subsystem, and much more is done by the agent. The master only has to compile manifests and build catalogs from them. This becomes increasingly complex as you hand over more control to Puppet.

There is one more task your master is responsible for. Many of your manifests will contain file resources that rely on prepared content:

file { '/usr/local/etc/my_app.ini':
ensure => file,
owner => 'root',