Re: Fedora 34 Change proposal: Remove and deprecate nscd in favour of sssd and systemd-resolved (Self-Contained Change)

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* Nico Kadel-Garcia:

> On Thu, Nov 5, 2020 at 6:39 AM Petr Menšík <pemensik@xxxxxxxxxx> wrote:
>>
>> No, no, NO again.
>>
>> nscd has no important active bugs in Fedora. I am not sure what bugs are
>> mentioned, but just a few active bugs are on glibc component in Fedora.
>> Therefore it seems just fine no commits are good.
>>
>> Just unlike systemd-resolved, which actively breaks some use cases. It
>> changes resolution order of search directive in resolv.conf, breaks
>> DNSSEC, breaks one label names resolution. It is famous among DNS
>> community [1].
>
> sssd also breaks other LDAP setups, It's extremely broken with larger
> LDAP setups because it insists on caching *ALL* of the LDAP, barring
> being able to filter to only a smaller set of the LDAP.

Have you filed a bug report?  I have seen similar reports, but I think
they were unexpected interactions with certain LDAP servers and
schemata.

(I personally do not work on sssd, though.)

> nscd is a lightweight and *far* more stable tool, and should be used
> in preference to sssd wherever possible. An indepent LDAP and Kerberos
> toolkit is *far* more stable than sssd.

Just because it works for you doesn't mean that it's bug-free.  We know
from reviewing the source code that nscd has several problem areas that
are difficult to fix.  It may work fine under low-load situations.

I think it is more useful to focus on improving SSSD (which is already
more or less required for Windows domain integration) than maintain two
different caching solutions.

Thanks,
Florian
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