so returning to the original topic, with this setup :
-We can add services to master, and the configuration (db) will be replicated to slave, but not the information, like php files or mails. So as it is, is only usefull for dns (because all info is in db).
-We can add services directly to slave (vi master cp), and in this case the configuration will only be in the slave db. True ?
If it work that way, i see the inconvenient that accounts (www,mail) created in master, are less secure, because a security problem in a slave can compromise credentials in master.
That way, maybe the functionalities not pay the risk, so i guess there is a way to setup a dns zone in a slave that works like a traditional bind secondary zone, being notified from changes from master. Is there any way to implement this scenario with isconfig/mydns ?