[bug#43540] [PATCH] Instantiate nscd in each system container instead of using the container host's service.

[Mathieu Othacehe <othacehe@gnu.org>]

Hello Jason,

Thanks for this patch. You need to write a commit message that is
compliant with the ChangeLog format, see:
https://guix.gnu.org/manual/en/html_node/Submitting-Patches.html.

> +(define %nscd-container-caches
> +  ;; Similar to %nscd-default-caches but with smaller cache sizes. This allows
> +  ;; many containers to coexist on the same machine without exhausting RAM.
> +  (list (nscd-cache (database 'hosts)
> +                    (positive-time-to-live (* 3600 12))
> +                    (negative-time-to-live 20)
> +                    (persistent? #t)
> +                    (max-database-size (expt 2 18)))
> +        (nscd-cache (database 'services)
> +                    (positive-time-to-live (* 3600 24))
> +                    (negative-time-to-live 3600)
> +                    (check-files? #t)   ;check /etc/services changes
> +                    (persistent? #t)
> +                    (max-database-size (expt 2 18)))))

You can write something like:

--8<---------------cut here---------------start------------->8---
(map (lambda (cache)
       (nscd-cache
        (inherit cache)
        (max-database-size (expt 2 18)))) ;256KiB
     %nscd-default-caches)
--8<---------------cut here---------------end--------------->8---

to avoid repeating the same values.

Otherwise, looks nice. Could you please send an updated version?

Thanks,

Mathieu
-- 
https://othacehe.org