Real HA cluster implementation

[alexskynet]

Well
Today I modified the scripts used to set up and delete user accounts to have them inserted into a database's table.
Now users are created in ISPCP db and can be authenticated by any server (p.e. by SSH) in the cluster using nsslib like a "real" local user.
All the changes go into ispcp_common_code.pl and are very few lines of code.
I've added a new configuration value called USENSSMYSQL so if I set it to 1 it uses the NSS patch, and if I unset it or set it to 0 the original code form ISPCP is run.
Dovecot authenticates users on the database (and so does Postfix)
Now I'm planning to integrate pure-ftpd (seen the howto).
The actual implementation uses two cluster members and a NAS for shared storage, so the members may easily switch in Active/Passive status.
I plan to also work on a path to enable ISPCP to work with NATted load balanced servers.
If anyone is interested, I'm preparing a very simple howto to reach the actual status