OK... a couple of items to cover here:
1) Whether or not you access over SSL, the LDAP database will not change. OpenLDAP is the server software, and it reads/writes to a database file -- which you should backup before doing anything else!
2) If you installed OpenLDAP from yum, or most RPM repositories, the SSL libraries should already be compiled in... if not, you'll need to rebuild OpenLDAP with SSL enabled
For help in re-building your OpenLDAP server software, BACKUP YOUR DATABASE and read here:
http://www.openldap.org/doc/admin24/install.html3) Once the database server (OpenLDAP, specifically) has SSL capabilities compiled in, you'll need to configure the security certificates. Detailed instructions can be found here:
http://www.credentia.cc/certs/howto/openldap.html4) Assuming you backed up your database, you should be all set -- EVEN IF the rebuild reset your database... which I've NEVER seen it do, but this should NOT be the "year of living dangerously" -- so check as you go along!
Good Luck!
Dan
IT4SOHO