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nscd.8

NSCD

Section: Linux Programmer's Manual (8)
Updated: 2008-12-05
Index Return to Main Contents
 

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. getspnam(3) calls remain uncached as a result.  

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 non-standard 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 3.21 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/.


 

Index

NAME
DESCRIPTION
OPTIONS
NOTES
SEE ALSO
COLOPHON

 

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