UNIX and Linux System Administration Handbook 4th edition
Evi Nemeth & Garth Snyder & Trent R. Hein & Ben Whaley
Learning Proxmox VE
Rik Goldman
Docker Containers: From Start to Enterprise
Christopher Negus
Network Security: A Practical Approach
Jan L. Harrington
So long, and thanks for all the fish
Douglas Adams
The Hitchhiker's Guide to the Galaxy (4)