Hi,
I've just completed a detailed blog article series about central authentication using 389 Directory Server. It's in French, and I published it on my tech blog.
* https://www.microlinux.fr/389-ds-centos-7/
* https://www.microlinux.fr/389-ds-utilisateurs-centos-7/
* https://www.microlinux.fr/389-ds-tls-centos-7/
* https://www.microlinux.fr/opensuse-leap-15-1-389-ds/
Cheers from the sunny South of France,
Niki Kovacs