If Michael Kerrisk is reading this: would be great to have a small supplementary book to the great "The Linux Programming Interface" that handles namespaces, capabilities et al.
I had the absolute pleasure of attending a week of all-day sessions with Michael Kerrisk and on 2 or 3 or those days he covered only container related primitives. His materials were great and he was an excellent teacher.
+1
Pricing of the book should be easy, worth its weight in gold.
He's actually teaching a class that I'm in now and I just asked him! He says writing a book like that is in his plans when he has some downtime