Section: Linux Programmer's Manual (8)
nscd - name service cache daemon
is a daemon that provides a cache for the most common name service
The default configuration file,
determines the behavior of the cache daemon.
provides caching for accesses of the
databases through standard libc interfaces, such as
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.
calls remain uncached as a result.
will give you a list with all options and what they do.
The daemon will try to watch for changes in configuration files
appropriate for each database (e.g.,
database), and flush the cache when these are changed.
However, this will happen only after a short delay (unless the
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
In that case, you need to run the following command
after changing the configuration file of the database so that
invalidates its cache:
$ nscd -i <database>
This page is part of release 5.02 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at