[Freeipa-users] IPA & hostnames. Why not use `hostname -fqdn` instead of forcing `hostname` to be fully qualified?

[Ondrej Valousek]

> No, unless you can alias them in the KDC.
> Our KDC can technically supports aliases now, but we haven't added these
> kind of aliases yet to it. And it is a bit controversial on whether we
> want to.
>
> In A windows domain you simply cannot have client residing in a DNA
> domain that is not the same as the domain controller. This is a pretty
> hard limitation and we do not want to add it to FreeIPA.
>
> Now why does it matter in this case ?
> It matter because, by forcing a single DNS Domain windows can univocally
> say a<->  a.b.c given the b.c part is forced on all clients joined to
> that domain.
> This does not hold true for FreeIPA. You could have foo.bar.example.com
> and foo.rab.example.com ie 2 host with the same short name but in
> different subdomains. if we alias both foo's and then we try to obtain a
> ticket for host/foo at REALM then the KDC does not know which foo you refer
> to. And if we alias only one then the second foo will simply fail to use
> the shortname.
>
> So the solution is to always use fully qualified names, which seem a
> pretty decent compromise that shouldn't really cause issues in the vast
> majority of cases.
>
> Simo.
>
I understand now, thanks. But still I see 2 limitations in this:
1. I dare to say most people do not care that they CAN join foo.rab.example.com machine to the bar.example.com domain - to me, it is only 
confusing. In fact, this is a complete new information to me. I still believe we should produce at least a small warning if we find that DNS 
domain <> IPA domain.
2. You see problems like this - there is nowhere said that your `hostname` must be FQDN as the OS itself happily accept both.

Either case, the ipa-client-install script should be able to detect such a case and offer some solution at least (I have a faint feeling 
there is even BZ already opened against this).

Ondrej


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