|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
|
nscd(8) System Manager's Manual nscd(8)
nscd - name service cache daemon
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),
hosts(5) services(5) and netgroup 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.
--help 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., /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>
nscd.conf(5), nsswitch.conf(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 nscd(8)
Pages that refer to this page: nscd.conf(5)
|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|