Book Image

Mastering Puppet 5

By : Ryan Russell-Yates, Jason Southgate
Book Image

Mastering Puppet 5

By: Ryan Russell-Yates, Jason Southgate

Overview of this book

Puppet is a configuration management system and a language written for and by system administrators to manage a large number of systems efficiently and prevent configuration drift. The core topics this book addresses are Puppet's latest features and mastering Puppet Enterprise. You will begin by writing a new Puppet module, gaining an understanding of the guidelines and style of the Puppet community. Following on from this, you will take advantage of the roles and profiles pattern, and you will learn how to structure your code. Next, you will learn how to extend Puppet and write custom facts, functions, types, and providers in Ruby, and also use the new features of Hiera 5. You will also learn how to configure the new Code Manager component, and how to ensure code is automatically deployed to (multiple) Puppet servers. Next, you will learn how to integrate Puppet with Jenkins and Git to build an effective workflow for multiple teams, and use the new Puppet Tasks feature and the latest Puppet Orchestrator language extensions. Finally, you will learn how to scale and troubleshoot Puppet. By the end of the book, you will be able to deal with problems of scale and exceptions in your code, automate workflows, and support multiple developers working simultaneously.
Table of Contents (19 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Working with dead code


Another issue that can often hit you as your Puppet code base ages is unused code in your codebase. But, there's a tool out there in the wild we can use to keep on top of this issue.

puppet-ghostbuster essentially compares what is actually being used (stored in PuppetDB) to what you think you are using (in your code base directory). This give you the opportunity to slash and burn anything that's really unused. This is great from the point of view of software maintainability. A smaller code base is simply cheaper to maintain!

Let's quickly run through using this Ruby gem.

Make the following settings in your environment variables:

  • HIERA_YAML_PATH: The location of the hiera.yaml file. It defaults to /etc/puppetlabs/code/hiera.yaml.
  • PUPPETDB_URL: The URL or the PuppetDB. It defaults to http://puppetdb:8080.
  • PUPPETDB_CACERT_FILE: Your site's CA certificate.
  • PUPPETDB_CERT_FILE: A SSL certificate signed by your site's Puppet CA.
  • PUPPETDB_KEY_FILE: The private key for that certificate.

 

Run the command as follows:

$ find . -type f -exec puppet-lint --only-checks ghostbuster_classes,ghostbuster_defines,ghostbuster_facts,ghostbuster_files,ghostbuster_functions,ghostbuster_hiera_files,ghostbuster_templates,ghostbuster_types {} \+

You can add to and remove from the comma-delimited items to check for unused classes, defined types, facts, files, functions, Hiera files, templates, and types.