About the reviewer

Donald Tevault—but you can call him Donnie—got involved with Linux way back in 2006, and has been working with it ever since. He holds the Linux Professional Institute Level 3—security certification, and the GIAC Incident Handler certification. Donnie is a professional Linux trainer, and thanks to the magic of the internet, teaches Linux classes literally the world over from the comfort of his living room.

Sam Norbury is someone who you never find frowning, at best you'll get a non-informative mmm from his general direction, which gives nothing away as to the inner-workings of his head, or what he thinks of your latest suggestion. Prized for his Ansible knowledge and patience, he now splits his time between consulting and travelling the world, spreading apathy everywhere he goes.

Jon Nield is a senior engineer who's reputation for calm and methodical problem solving has earned him a reputation as one of the most easy-going and nicest guys in tech. Having worked in the computing and server industry for many years, his expertise in areas such as C, and the underpinnings of the Linux operating system, make him a highly-sought consultant.