There still are details (and even complete subsystems) to be documented more thoroughly, but this is the workbook I presented at MySQL Conference. I’ve heard comments that the book has ‘hypothetical’ situations, but generally every bit is there represents real practice we’re having.
The talk did drift to some bits of information that may not be there (or did go much deeper), as well as the book covers some parts of operations that were not discussed at the tutorial talk. Anyway, I hope both session and tutorial has some value.
Here’s the file: Wikipedia: Site internals, configuration, code examples and management issues (the workbook). For now it is PDF, but I hope to transform it into properly evolving public document.
Update: Another good presentation on Wikipedia technology by Mark: Wikimedia Architecture