Kubernetes: Up and Running
Kelsey Hightower & Brendan Burns & Joe Beda & Lachlan Evenson
Ubuntu Linux Unleashed 2021 Edition
Matthew Helmke
Nmap Network Scanning
Gordon Lyon
Building Secure and Reliable Systems
Heather Adkins & Betsy Beyer & Paul Blankinship & Piotr Lewandowski & Ana Oprea & Adam Stubblefield
SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys
Michael W Lucas