During installation you’re asked for both the system’s fully-qualified domain name and the LDAP base DN. The screen looks like this:
Here you can remove the
.intranet from the FQDN and change the LDAP base DN accordingly.
I highly suggest you only change the FQDN and accept what the installer will automatically derive from the changed FQDN as the LDAP base DN. Standardized setups are easier to reason about and debug later on if you ever run into trouble.
Just keep in mind that you should never, ever use a domain name for the UCS domain that’s already in used externally. For example, my company’s public domain is
linet-services.de. As the UCS system must be in control of all the DNS entries in the domain it’ll manage, I must not use
linet-services.de for my UCS system. Using a sub-domain of an externally-available domain on the other hand is just fine — meaning I can use e.g.
ucs.linet-services.de for my UCS domain as long as it isn’t used yet.