I wrote briefly about securing MySQL last week and Andrew-J2000 suggested he was looking for a bit more depth into the clustering side of the scenario. I have recommended some additional links here for night-table reading to study up on some case studies, documentation and other miscellany involved with clustering MySQL.
When it comes to MySQL – one of the best sources remains the vendor. MySQL AB has developed alot of credibility based on its extensive documentation and depth of community participants in extending tips and techniques. There are numerous links out to further resources including training.
Finally there is also a very nice How To which includes configuration and security tips by Alex Davies.