Hi I have just bought the ebook but it only show how to configure the two servers using apache but I would to use nginx. Is possible? Please can you help? Thanks.
Yes, thats possible as well. The setup is very similar to the apache guide, just replace the chapter that installs apache with the correspnding nginx installation chapter of the ispconfig nginx perfect server guide.
The setup requires mysql replication and a sync of the /var/www and /var/vmail filesystems, this has both to be setup at the right time to get a working mirrored setup.