I have multi server setup. Server A - master and B - mirror of master. I'm sharing /var/www with GlusterFS. Apache vhosts working fine from both servers, bet I have issues with FTP. All is working great on server A, bet on server B I can't login. I did research and found that /etc/pure-ftpd/db/mysql.conf is causing problems. After changing server_id = '1' in config file to id = '2' I was able to login via FTP on server B.