Mirror server ISPConfig install
I used this guide http://www.howtoforge.com/perfect-server-debian-lenny-ispconfig3. But I did not share /var/lib/mysql with GlusterFS. Instead I used MySQL master-master replication that replicates all databases except 'mysql' and ' information_schema'. When I installed ISPConfig on the second server. The installer changed MySQL user's 'ispconfig' password on first server so I was unable to login in to ISPConfig web interface. Then I changed MySQL ispconfig user password on first server from file in first server (/usr/local/ispconfig/interface/lib/config.inc.php). Then I was able to login.