http://www.redmine.org/projects/redmine/wiki/HowTos#FreeBSD
http://www.redmine.org/projects/redmine/wiki/Redmine_on_CentOS_installation_HOWTO
HowTo configure Nginx to run Redmine
http://www.redmine.org/projects/redmine/wiki/HowTo_configure_Nginx_to_run_Redmine