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161 lines
4.2 KiB
Groff
161 lines
4.2 KiB
Groff
.\" Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd October 5, 2018
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.Dt NSCD 8
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.Os
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.Sh NAME
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.Nm nscd
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.Nd "name service caching daemon"
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.Sh SYNOPSIS
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.Nm
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.Op Fl dnst
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.Op Fl i Ar cachename
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.Op Fl I Ar cachename
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.Sh DESCRIPTION
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The
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.Nm
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utility
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is the system caching daemon.
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It can cache almost all types of data and is basically intended to be used
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with the
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.Nm nsswitch
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subsystem.
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The cache is actually per-user.
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This means that each user can work only with the
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cached data that were cached by themselves, and cannot poison the
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cache of other users.
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The
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.Nm
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utility supports two types of caching:
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.Bl -tag -width ".Sy Type"
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.It Sy Type
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.Sy Description
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.It Common caching
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Each cached element is the key+value pair.
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This type of caching supports policies which are applied when maximum
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number of cached elements is exceeded.
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Three policies are available:
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.Cm FIFO
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(first in - first out),
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.Cm LRU
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(least recently used) and
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.Cm LFU
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(least frequently used).
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This type of caching is used with the
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.Fn getXXXbyname
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family of functions.
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.It Multipart caching
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Each cached element is the part of the elements sequence.
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This type of caching is intended to be used with the
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.Fn getXXXent
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family of functions.
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.El
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.Pp
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The
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.Nm
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utility is able not only to cache elements, but to perform the actual nsswitch
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lookups by itself.
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To enable this feature, use the
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.Va perform-actual-lookups
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parameter in
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.Xr nscd.conf 5 .
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.Pp
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The
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.Nm
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utility recognizes the following runtime options:
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.Bl -tag -width indent
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.\" .It Fl d
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.\" XXX Document me!
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.It Fl n
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Do not daemonize;
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.Nm
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will not fork or disconnect itself from the terminal.
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.It Fl s
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Single-threaded mode.
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Forces using only one thread for all processing purposes (it overrides
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the
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.Va threads
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parameter in the
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.Xr nscd.conf 5
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file).
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.It Fl t
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Trace mode.
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All trace messages will be written to stdout.
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This mode is usually used with
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.Fl n
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and
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.Fl s
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flags are used for debugging purposes.
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.It Fl i Ar cachename
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Invalidates personal cache.
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When specified,
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.Nm
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acts as the administration tool.
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It asks the already running
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.Nm
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to invalidate the specified part of the cache of the
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calling user.
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For example, sometimes you may want to invalidate your
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.Dq Li hosts
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cache.
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You can specify
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.Dq Li all
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as the
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.Ar cachename
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to invalidate your personal cache as a whole.
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You cannot use this option for the
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.Ar cachename
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for which the
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.Va perform-actual-lookups
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option is enabled.
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.It Fl I Ar cachename
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Invalidates the cache for every user.
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When specified,
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.Nm
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acts as the administration tool.
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It asks the already
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running
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.Nm
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to invalidate the specified part of the cache for
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every user.
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You can specify
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.Dq Li all
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as the
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.Ar cachename
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to invalidate the whole cache.
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Only the root can use this option.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /etc/nscd.conf" -compact
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.It Pa /etc/nscd.conf
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The default configuration file.
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.El
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.Sh SEE ALSO
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.Xr nsdispatch 3 ,
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.Xr nscd.conf 5 ,
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.Xr nsswitch.conf 5
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.Sh AUTHORS
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.An Michael Bushkov Aq Mt bushman@FreeBSD.org
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