What is the smoothest way?

1. Do a backup of your mysql database using mysqldump as described in the backup post earlier.
2. Restore that into your new mysql system
3. Copy /opt/ona to your new system
4. Set up apache the same as you did before on your new box.

Should be that simple. Really the hardest part is doing the mysql backup/restore.. there are plenty of documents/guides on the internet describing that task in much more detail.

Tried to install a new, then import the old database, but i couldnt log in. I get this error "Error: the xml response that was returned from the server is invalid. Recived:"

/var/log/httpd/error.log looks like this:

http://pastebin.com/E9m6q47J

your log output shows that you need to touch /var/log/ona.log and make sure it has permissions that allow your web server to write to it. This is covered in the install documentation so that should cover that part.

the problem was acctuly that i missed some ldap rpms (found it after turned mysql debug on)