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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)
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user-space interface documentation) project. Information about
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⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2024-06-26. If you discover any rendering problems in this HTML
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Linux man-pages 6.9.1 2024-05-02 nscd(8)
Pages that refer to this page: nscd.conf(5)
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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. |
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