On Fri, 2020-09-18 at 16:55 -0300, Andreas Hasenack wrote:
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> Hi,
> 
> I'm verifying under which conditions sssd will perform successful dns
> updates on a DNS server backed by AD.
> 
> In this scenario, I have a standalone computer, that has an IP
> obviously, but no DNS record yet. My goal was to have the join process
> also add a DNS record for this computer.
> 
> After tracing calls to nsupdate, it looks like what sssd does is use
> the output of `hostname -f`, and I don't see a fault with that
> reasoning, except that to have that return an fqdn I need either to be
> in DNS already, or hack /etc/hosts. Otherwise, it sends the short name
> with a dot suffix, and that won't be accepted:
> update delete g-client1. in A
> update add g-client1. 3600 in A 10.51.0.8
> send
> update delete g-client1. in AAAA
> send
> 
> I was wondering if sssd couldn't assume that the domain part is the
> same as the realm? I understand there might be many considerations
> here, like multiple domains, forests, etc, and maybe that's why this
> isn't done. But perhaps there is a way to have the simple case work?
> Or is there a config option I missed?
> 
> The other trick I see is to set the hostname to the fqdn, so that
> `hostname` returns the full thing. It's not technically correct I
> suppose, but gets the job done. Is that what people also do?

Yes I think so. I did a number of years ago and I think some dists. already do
that by default.
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