Have you tried to use RHEL IdM documentation? It pretty much covers all of the topics.
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9#Identity%20Management

For example, https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/installing_identity_management/installing-an-ipa-server-with-external-ca_installing-identity-management

However, this does not yield successful results.

Interesting, it yields expected results in our CI, for years. For an example see today's workflow run: https://github.com/freeipa/freeipa-container/actions/runs/12346008632/job/34451034113. You might want to describe in more detail what exactly you do, what exactly you get, and where your expectations start to diverge from reality.

Besides the links that @abbra has provided, you are of course free to follow the installation without the CA per https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/installing_identity_management/installing-an-ipa-server-without-a-ca_installing-identity-management#installing-an-ipa-server-without-a-ca_installing-identity-management but you will have to provide the needed certificates manually. Our note about --external-ca is really just to help users with the differences that the containerized setup brings for that use-case.

Thanks for the quick response.
I don't mean to offend. I just didn't realize your documention is kept in other locations. My mistake.

Yes, this is all stated on https://www.freeipa.org/page/Documentation.html

@gezegituser1
https://www.freeipa.org/page/Certificate_Authority#use-a-different-ca-to-sign-the-ipa-ca-certificate

ipa-server-install --external_cert_file=/root/ipa.crt --external_ca_file=/root/existing_ca.crt

Please check https://github.com/freeipa/freeipa-container/pull/647/files to see of this pointer to the FreeIPA Documentation page would be sufficient.