NSCD(8)                                             Linux Programmer's Manual                                            NSCD(8)



NAME
       /usr/sbin/nscd - name service cache daemon

DESCRIPTION
       Nscd  is  a  daemon  that  provides  a  cache for the most common name service requests.  The default configuration file,
       /etc/nscd.conf, determines the behavior of the cache daemon.  See nscd.conf(5).

       Nscd provides caching for accesses of the passwd(5), group(5), and hosts(5) databases through standard  libc  interfaces,
       such as getpwnam(3), getpwuid(3), getgrnam(3), getgrgid(3), gethostbyname(3), and others.

       There  are  two  caches  for each database: a positive one for items found, and a negative one for items not found.  Each
       cache has a separate TTL (time-to-live) period for its data.  Note that the shadow file is specifically not cached.  get-
       spnam(3)  calls  remain uncached as a result.  As a result of this behavior it is not possible to change non-nscd user to
       another non-nscd user via su service when nscd is running.

OPTIONS
       --help will give you a list with all options and what they do.

NOTES
       The daemon will try to watch for changes in configuration files appropriate for each database (e.g.  /etc/passwd for  the
       passwd  database  or /etc/hosts and /etc/resolv.conf for the hosts database), and flush the cache when these are changed.
       However, this will happen only after a short delay (unless the inotify(7) mechanism is available and glibc 2.9  or  later
       is available), and this auto-detection does not cover configuration files required by nonstandard NSS modules, if any are
       specified in /etc/nsswitch.conf.  In that case, you need to run the following command after  changing  the  configuration
       file of the database so that nscd invalidates its cache:

           $ nscd -i <database>

SEE ALSO
       nscd.conf(5), nsswitch.conf(5)

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        2008-12-05                                                    NSCD(8)