About the Reviewers

Ugo Bellavance has done most of his studies in e-commerce. He started using Linux from RedHat 5.2, got Linux training from Savoir-faire Linux at age 20, and got his RHCE on RHEL 6 in 2011. He's been a consultant in the past, but he's now an employee for a provincial government agency for which he manages the IT infrastructure (servers, workstations, network, security, virtualization, SAN/NAS, and PBX). He's a big fan of open source software and its underlying philosophy. He has worked with Debian, Ubuntu, and SUSE, but what he knows best is RHEL-based distributions. He's known for his contributions to the MailScanner project (he has been a technical reviewer for MailScanner User Guide and Training Manual, Julian Field), but he has also given time to different open source projects such as Mondo Rescue, OTRS, SpamAssassin, pfSense, and a few others. He's been a technical reviewer for Centos 6 Linux Server Cookbook, Jonathan Hobson, Packt Publishing and Puppet 3 Beginner's Guide, John Arundel, Packt Publishing.

I thank my lover, Lysanne, who accepted to allow me some free time slots for this review even with two dynamic children to take care of. The presence of these three human beings in my life is simply invaluable.

I must also thank my friend Sébastien, whose generosity is only matched by his knowledge and kindness. I would never have reached this high in my career if it wasn't for him.

C. N. A. Corrêa (@cnacorrea) is an IT operations manager and consultant. He is also a Puppet enthusiast and an old-school Linux hacker. He has a master's degree in Systems Virtualization and holds the CISSP and RHCE certifications. Backed by a 15-year career on systems administration, Carlos leads IT operations teams for companies in Brazil, Africa, and the USA. He is also a part-time professor for graduate and undergraduate courses in Brazil. Carlos co-authored several research papers on network virtualization and OpenFlow, presented on peer-reviewed IEEE and ACM conferences worldwide.

I thank God for all the opportunities of hard work and all the lovely people I always find on my way. I thank the sweetest of them all, my wife Nanda, for all her loving care and support that pushes me forward. I would also like to thank my parents, Nilton and Zélia, for being such a big inspiration for all the things I do.

Jeroen Hooyberghs has eight years of professional experience in many different Linux environments. Currently, he's employed as an Open Source and Linux Consultant at Open-Future in Belgium. Since the past year, a lot of his time has been going into implementing and maintaining Puppet installations for clients.

I would like to thank my two girls, Eveline and Tess, for understanding that a passion for open source requires evenings and weekends spent on it.

Johan De Wit was an early Linux user, and he still remembers the day he built a 0.9x Linux kernel on his brand new 486 computer that took an entire night. His love for the UNIX operating systems existed before Linux was announced. It is not surprising that he started a career as a UNIX system administrator.

He doesn't remember precisely when he started working with open source software, but since 2009, he is working as an Open Source Consultant at Open-Future, where he got the opportunity to work with Puppet. Right now, Puppet has become Johan's biggest interest. He also loves to teach Puppet as one of the few official Puppet trainers in Belgium.

Johan started the Belgian Puppet User Group a year ago, where he tries to bring some Puppeteers together having great and interesting meetups. When he takes time writing some Puppet-related blogs, he mostly does that at http://puppet-be.github.io/, the BPUG website. Also, from time to time, he tries to spread some hopefully wise Puppet words by presenting talks at Puppet camps across in Europe.

Besides having fun at work, he spends a lot of his free time with his two lovely kids, his two Belgian draft horses, and if time and the weather permits, he likes to (re)build and drive his old-school chopper.