Hacking VoIP: Protocols, Attacks, and Countermeasures
Himanshu Dwivedi
The GNU Make Book
John Graham-Cumming
Pro Linux High Availability Clustering
Sander van Vugt
Kubernetes: Up and Running
Kelsey Hightower & Brendan Burns & Joe Beda & and Lachlan Evenson
Laravel Application Development Cookbook
Terry Matula
Programming With CodeIgniterMVC
Eliahou Orr & Yehuda Zadik
Scaling PHP
Steve Corona
Hack and HHVM: Programming Productivity Without Breaking Things
Owen Yamauchi