[till]

Ispconfig creates the users and groups on both servers with the same name, so mirroring works fine and there is already. Howto published on this topic. Just ensure that you use identical setups for both servers especially that the uid and gid of the last user before you install ispconfig on the servers is the same. This ensures thant all additional users created by ispconfig has the same uid and gid on boh severs.

Ispconfig creates the mysql users on all mirrors auomatically. Just ensure that the mysql interface can only be installed on the master and may not be installed on the slaves. See mirroring totorial.