Unverified Commit 81bb2ba4 authored by Florian Klink's avatar Florian Klink Committed by GitHub
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Merge pull request #197986 from flokli/rl-nsncd 

nixos/doc/rl-2211: document nsncd option
parents d473811b 83807f3a

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

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.