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Per bug #1836427, it seems like having the keytab entries can be useful for some applications, such as sshd.

I've created bug #1852370 for "net ads join dnshostname=FQDN"

(In reply to Andreas Schneider from comment #26)
> I've created bug #1852370 for "net ads join dnshostname=FQDN"

As discussed we already have bug #1836427 for net-ads-join dnshostname=fqdn, which is integrated in 7.9 branch.

This for in this bug, for adding additional-dns-hostnames from smb.conf to keytab, currently only works with samba-dc but not with Windows DC.
I opened bug #1852812 to fix it against Windows DC in zstream branch if approved.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: samba security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:3981

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 500 days