Linux Kernel in a Nutshell is a 2006 book by Greg Kroah-Hartman. It is released under the Creative Commons Attribution-ShareAlike 2.5 License.
This is a mirror and not the authoritative location (http://www.kroah.com/lkn/)
The book is written in Docbook XML format as per standard O'Reilly guidelines. More information on their toolchain can be found in the dblite directory. O'Reilly books use a modified version of Docbook XML and their corredponding DTD files are in the dblite path.
One of the primary reasons for this mirror was creating a version of the book in EPUB and Mobi format. These files are located under the "releases" directory. The source for the epub changes are in the epub branch.
To generate the required files for the epub:
$ xsltproc /usr/share/sgml/docbook/xsl-stylesheets-1.78.1/epub/docbook.xsl ../book.xml
$ cp -r ../images OEBPS/
$ echo "application/epub+zip" > mimetype
$ zip -0Xqr lkn.epub mimetype META-INF OEBPS/
This will create two new directories META-INF and OEBPS. These contain the content for the book. Unfortunately since the O'Reilly Docbook is non standard it doesn't know how to handle the images, but copying the directory into OEBPS fixes this. Finally, the zip command generates the actual epub file lkn.epub.