1.\" Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd October 5, 2018 28.Dt NSCD 8 29.Os 30.Sh NAME 31.Nm nscd 32.Nd "name service caching daemon" 33.Sh SYNOPSIS 34.Nm 35.Op Fl dnst 36.Op Fl i Ar cachename 37.Op Fl I Ar cachename 38.Sh DESCRIPTION 39The 40.Nm 41utility 42is the system caching daemon. 43It can cache almost all types of data and is basically intended to be used 44with the 45.Nm nsswitch 46subsystem. 47The cache is actually per-user. 48This means that each user can work only with the 49cached data that were cached by themselves, and cannot poison the 50cache of other users. 51The 52.Nm 53utility supports two types of caching: 54.Bl -tag -width ".Sy Type" 55.It Sy Type 56.Sy Description 57.It Common caching 58Each cached element is the key+value pair. 59This type of caching supports policies which are applied when maximum 60number of cached elements is exceeded. 61Three policies are available: 62.Cm FIFO 63(first in - first out), 64.Cm LRU 65(least recently used) and 66.Cm LFU 67(least frequently used). 68This type of caching is used with the 69.Fn getXXXbyname 70family of functions. 71.It Multipart caching 72Each cached element is the part of the elements sequence. 73This type of caching is intended to be used with the 74.Fn getXXXent 75family of functions. 76.El 77.Pp 78The 79.Nm 80utility is able not only to cache elements, but to perform the actual nsswitch 81lookups by itself. 82To enable this feature, use the 83.Va perform-actual-lookups 84parameter in 85.Xr nscd.conf 5 . 86.Pp 87The 88.Nm 89utility recognizes the following runtime options: 90.Bl -tag -width indent 91.\" .It Fl d 92.\" XXX Document me! 93.It Fl n 94Do not daemonize; 95.Nm 96will not fork or disconnect itself from the terminal. 97.It Fl s 98Single-threaded mode. 99Forces using only one thread for all processing purposes (it overrides 100the 101.Va threads 102parameter in the 103.Xr nscd.conf 5 104file). 105.It Fl t 106Trace mode. 107All trace messages will be written to stdout. 108This mode is usually used with 109.Fl n 110and 111.Fl s 112flags are used for debugging purposes. 113.It Fl i Ar cachename 114Invalidates personal cache. 115When specified, 116.Nm 117acts as the administration tool. 118It asks the already running 119.Nm 120to invalidate the specified part of the cache of the 121calling user. 122For example, sometimes you may want to invalidate your 123.Dq Li hosts 124cache. 125You can specify 126.Dq Li all 127as the 128.Ar cachename 129to invalidate your personal cache as a whole. 130You cannot use this option for the 131.Ar cachename 132for which the 133.Va perform-actual-lookups 134option is enabled. 135.It Fl I Ar cachename 136Invalidates the cache for every user. 137When specified, 138.Nm 139acts as the administration tool. 140It asks the already 141running 142.Nm 143to invalidate the specified part of the cache for 144every user. 145You can specify 146.Dq Li all 147as the 148.Ar cachename 149to invalidate the whole cache. 150Only the root can use this option. 151.El 152.Sh FILES 153.Bl -tag -width ".Pa /etc/nscd.conf" -compact 154.It Pa /etc/nscd.conf 155The default configuration file. 156.El 157.Sh SEE ALSO 158.Xr nsdispatch 3 , 159.Xr nscd.conf 5 , 160.Xr nsswitch.conf 5 161.Sh AUTHORS 162.An Michael Bushkov Aq Mt bushman@FreeBSD.org 163