Well, FC6 isn't a supported platform at the moment. If you look through the logs you'll find this:
Code:
bdb_db_open: database already in use
backend_startup_one: bi_db_open failed! (-1)
slap_startup failed
*** Running as zimbra user: /opt/zimbra/bin/ldap start
slapd already running: pid 24801
which would indicate you've tried to do a re-install when slapd was running. Stop all the Zimbra services with 'zmcontrol stop' then check to see if there's any more zimbra services running and kill them. When you've done that I'd suggest running a './install.sh -u' to completely remove Zimbra from the system. Make sure that your /etc/hosts file is correct and that you have correct DNS A & MX records pointing to your zimbra server and that any firewall or SElinux is disabled then do an install. When you've done that post again with the results.