OpenStack Operations Guide
Tom Fifield & Lorin Hochstein & Jonathan Proulx & Everett Toews & Diane Fleming & Joe Topjian & Anne Gentle
Prelude to Foundation
Isaac Asimov
Foundation (6)
Modern Operating Systems
Andrew S. Tanenbaum & Herbert Bos
MySQL Cookbook: Solutions for Database Developers and Administrators
Paul Dubois
Absolute FreeBSD: The Complete Guide to FreeBSD, 2nd Edition
Michael W. Lucas
The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall
Peter N. M. Hansteen