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

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* Petr Menšík:

> 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].
>
> There is no controversy with nscd, it just caches names and nothing
> more. I think this is its advantage. Unless there is any stronger
> reason, I am against this change in advance.
>
> If serious bugs are in NSCD, please fill bugs on the component.

nscd has more usage downstream, leading to bugs such as:

  <https://bugzilla.redhat.com/show_bug.cgi?id=1551616>

Most of them are private, but you should be able to view them.

> Instead, I request again, split systemd-resolved into subpackage. I want
> it removed on my system and so do more people. Also, when I disable it,
> I have to fix /etc/resolv.conf by hand. I would think NetworkManager
> restart would refresh classic /etc/resolv.conf, like in F32.

This proposal is about nscd, not systemd-resolved.

If Fedora chooses to adopt another local DNS cache, glibc will use that
(probably using the built-in nss_dns service module) systemd-resolved is
just what we have for now, so the proposal references it.  But any other
DNS cache will work as well.

The hosts cache in nscd is arguably the weakest part of it, so
deprecating really shouldn't be controversial at all.

Thanks,
Florian
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