Really fun, straightforward, intensely practical book. I read it having a fairly good knowledge of FreeBSD, but next to no knowledge of jails, and am now comfortable using them, and even learned a new jail manager (Bastille) concurrently with the book without issue. As usual, it references all the useful manpages and many of the tunables you'll need, so the reader can easily fill in any gaps from the source.

I can tell this book will be a solid reference in the future as well.