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Merge pull request #197986 from flokli/rl-nsncd

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nixos/doc/rl-2211: document nsncd option
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Florian Klink 2022-11-29 17:21:58 +00:00 committed by GitHub
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26
nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
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@ -77,6 +77,32 @@
with any supported NixOS release.
</para>
</listitem>
<listitem>
<para>
<literal>nscd</literal> functionality, necessary to provide
non-glibc-builtin NSS modules (such as
<literal>nss_systemd</literal> or <literal>nss_ldap</literal>)
can now be provided by <literal>nsncd</literal>, by setting
<literal>services.nscd.enableNsncd</literal> to
<literal>true</literal>.
</para>
<para>
The <literal>nscd</literal> daemon provided by glibc, which is
currently used by NixOS isn’t very reliable. For example, it’s
<link xlink:href="https://github.com/NixOS/nixpkgs/issues/135888">not
fully possible to disable caching functionality</link>,
causing various issues and failed lookups.
</para>
<para>
In contrast to nscd’s behavior of caching module responses on
its own, nsncd merely forwards requests to NSS modules, which
might cache or not.
</para>
<para>
We plan to use <literal>nsncd</literal> by default in NixOS
23.05.
</para>
</listitem>
<listitem>
<para>
<literal>emacs</literal> enables native compilation which

14
nixos/doc/manual/release-notes/rl-2211.section.md
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@ -38,6 +38,20 @@ In addition to numerous new and upgraded packages, this release has the followin
for a transition period so that in time the ecosystem can switch without
breaking compatibility with any supported NixOS release.
- `nscd` functionality, necessary to provide non-glibc-builtin NSS
modules (such as `nss_systemd` or `nss_ldap`) can now be provided by
`nsncd`, by setting `services.nscd.enableNsncd` to `true`.
The `nscd` daemon provided by glibc, which is currently used by NixOS isn't
very reliable. For example, it's [not fully possible to disable caching
functionality](https://github.com/NixOS/nixpkgs/issues/135888), causing
various issues and failed lookups.
In contrast to nscd's behavior of caching module responses on its own,
nsncd merely forwards requests to NSS modules, which might cache or not.
We plan to use `nsncd` by default in NixOS 23.05.
- `emacs` enables native compilation which means:
- emacs packages from nixpkgs, builtin or not, will do native compilation ahead of time so you can enjoy the benefit of native compilation without compiling them on you machine;
- emacs packages from somewhere else, e.g. `package-install`, will do asynchronously deferred native compilation. If you do not want this, maybe to avoid CPU consumption for compilation, you can use `(setq native-comp-deferred-compilation nil)` to disable it while still enjoy the benefit of native compilation for packages from nixpkgs.