Openfire and server setting for maximum concurrent user

Dear Openfire Team,

Im installing openfire 3.7.1 in ubuntu 12.04 for my customer. I would like to know do i need to do any setting in ubuntu and openfire to support around 100,000 concorrent user. Do i need to increase the ulimit and java memory or anything else? I dont have any experince in linux server. Hope you guys will guide me in this.

Thank you in advance

Regards,

Saiva