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doc: Update "Name Service Switch" to new service framework. 

* gnu/services/avahi.scm (avahi-service): Mention the extension of
  nscd.
* doc/guix.texi (Networking Services): Update accordingly.
  (Name Service Switch): Remove '%my-base-services' example and
  explanation.
This commit is contained in:
Ludovic Courtès 2015-10-12 21:24:59 +02:00
parent 92e75d1e9a
commit cc9c1f3935
2 changed files with 13 additions and 27 deletions
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35
doc/guix.texi
View File

@ -6109,7 +6109,10 @@ The @code{(gnu services avahi)} provides the following definition.
[#:domains-to-browse '()]
Return a service that runs @command{avahi-daemon}, a system-wide
mDNS/DNS-SD responder that allows for service discovery and
"zero-configuration" host name lookups (see @uref{http://avahi.org/}).
"zero-configuration" host name lookups (see @uref{http://avahi.org/}), and
extends the name service cache daemon (nscd) so that it can resolve
@code{.local} host names using
@uref{http://0pointer.de/lennart/projects/nss-mdns/, nss-mdns}.
If @var{host-name} is different from @code{#f}, use that as the host name to
publish for this machine; otherwise, use the machine's actual host name.
@ -6587,31 +6590,11 @@ want is to have @code{.local} host lookup working.
Note that, in this case, in addition to setting the
@code{name-service-switch} of the @code{operating-system} declaration,
@code{nscd-service} must be told where to find the @code{nss-mdns}
shared library (@pxref{Base Services, @code{nscd-service}}). Since the
@code{nscd} service is part of @var{%base-services}, you may want to
customize it by adding this snippet in the operating system
configuration file:
@example
(use-modules (guix) (gnu))
(define %my-base-services
;; Replace the default nscd service with one that knows
;; about nss-mdns.
(map (lambda (service)
(if (member 'nscd (service-provision service))
(nscd-service (nscd-configuration
(name-services (list nss-mdns))))
service))
%base-services))
@end example
@noindent
@dots{} and then refer to @var{%my-base-services} instead of
@var{%base-services} in the @code{operating-system} declaration.
Lastly, this relies on the availability of the Avahi service
(@pxref{Networking Services, @code{avahi-service}}).
you also need to use @code{avahi-service} (@pxref{Networking Services,
@code{avahi-service}}), or @var{%desktop-services}, which includes it
(@pxref{Desktop Services}). Doing this makes @code{nss-mdns} accessible
to the name service cache daemon (@pxref{Base Services,
@code{nscd-service}}).
For convenience, the following variables provide typical NSS
configurations.

5
gnu/services/avahi.scm
View File

@ -129,7 +129,10 @@
(domains-to-browse '()))
"Return a service that runs @command{avahi-daemon}, a system-wide
mDNS/DNS-SD responder that allows for service discovery and
\"zero-configuration\" host name lookups (see @uref{http://avahi.org/}).
\"zero-configuration\" host name lookups (see @uref{http://avahi.org/}), and
extends the name service cache daemon (nscd) so that it can resolve
@code{.local} host names using
@uref{http://0pointer.de/lennart/projects/nss-mdns/, nss-mdns}.
If @var{host-name} is different from @code{#f}, use that as the host name to
publish for this machine; otherwise, use the machine's actual host name.