mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
154 lines
5.3 KiB
Groff
154 lines
5.3 KiB
Groff
.\" Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd October 6, 2018
|
|
.Dt NSCD.CONF 5
|
|
.Os
|
|
.Sh NAME
|
|
.Nm nscd.conf
|
|
.Nd "nscd configuration file"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
file
|
|
is used by the
|
|
.Xr nscd 8
|
|
daemon and is read on its startup.
|
|
Its syntax is mostly similar to the
|
|
.Pa nscd.conf
|
|
syntax in
|
|
.Tn Linux
|
|
and
|
|
.Tn Solaris .
|
|
It has some differences, though \[em] see them below.
|
|
.Pp
|
|
Each line specifies either an attribute and a
|
|
.Ar value ,
|
|
or an attribute, a
|
|
.Ar cachename
|
|
and a
|
|
.Ar value .
|
|
Usual cachenames are
|
|
.Dq Li passwd ,
|
|
.Dq Li group ,
|
|
.Dq Li hosts ,
|
|
.Dq Li services ,
|
|
.Dq Li protocols
|
|
and
|
|
.Dq Li rpc .
|
|
You can also use any other
|
|
.Ar cachename
|
|
(for example, if some third-party
|
|
application uses nsswitch).
|
|
.Bl -tag -width indent
|
|
.It Va threads Op Ar value
|
|
Number of threads, which would listen for connections and process requests.
|
|
The minimum is 1.
|
|
The default value is 8.
|
|
.It Va enable-cache Oo Ar cachename Oc Op Cm yes | no
|
|
Enables or disables the cache for specified
|
|
.Ar cachename .
|
|
.It Va positive-time-to-live Oo Ar cachename Oc Op Ar value
|
|
Sets the TTL (time-to-live) for the specified cache in seconds.
|
|
Larger values can increase system's performance, but they also can affect
|
|
the cache coherence.
|
|
The default value is 3600.
|
|
.It Va positive-policy Oo Ar cachename Oc Op Cm fifo | lru | lfu
|
|
The policy that is applied to erase some of the cache elements, when the
|
|
size limit of the given
|
|
.Ar cachename
|
|
is exceeded.
|
|
Possible policies are:
|
|
.Cm fifo
|
|
(first-in-first-out),
|
|
.Cm lru
|
|
(least-recently-used), and
|
|
.Cm lfu
|
|
(least-frequently-used).
|
|
The default policy is
|
|
.Cm lru .
|
|
.It Va negative-time-to-live Oo Ar cachename Oc Op Ar value
|
|
The TTL of the negative cached elements in seconds.
|
|
The larger values can significantly increase system performance in some
|
|
environments (when dealing with files with UIDs, which are not in system
|
|
databases, for example).
|
|
This number should be kept low to avoid the cache coherence problems.
|
|
The default value is 60.
|
|
.It Va negative-policy Oo Ar cachename Oc Op Cm fifo | lru | lfu
|
|
The same as the positive-policy, but this one is applied to the negative
|
|
elements of the given
|
|
.Ar cachename .
|
|
The default policy is fifo.
|
|
.It Va negative-confidence-threshold Oo Ar cachename Oc Op Ar value
|
|
The number of times a query must have failed before the cache accepts
|
|
that the element can not be found.
|
|
At the default value of 1 each negative query result is cached and
|
|
immediately returned from the cache on further queries.
|
|
Higher numbers cause queries to be retried at the configured data
|
|
sources the given number of times, before the negative result is
|
|
returned from the cache on further queries.
|
|
This allows to probe for the existence of an entry, and then to create
|
|
it if it did not exist, without the negative probe result preventing
|
|
access to the new entry for the duration of the negative TTL.
|
|
.It Va suggested-size Oo Ar cachename Oc Op Ar value
|
|
This is the internal hash table size.
|
|
The value should be a prime number for optimum performance.
|
|
You should only change this value when the number of cached elements is
|
|
significantly (5-10 times) greater than the default hash table size (257).
|
|
.It Va keep-hot-count Oo Ar cachename Oc Op Ar value
|
|
The size limit of the cache with the given
|
|
.Ar cachename .
|
|
When it is exceeded, the policy will be applied.
|
|
The default value is 2048.
|
|
.It Va perform-actual-lookups Oo Ar cachename Oc Op Cm yes | no
|
|
If enabled, the
|
|
.Xr nscd 8
|
|
does not simply receive and cache the NSS-requests results, but performs
|
|
all the lookups by itself and only returns the responses.
|
|
If this feature is enabled, then for the given
|
|
.Ar cachename
|
|
.Xr nscd 8
|
|
will act similarly to the NSCD.
|
|
.Pp
|
|
.Sy NOTE :
|
|
this feature is currently experimental \[em] it supports only
|
|
.Dq Li passwd ,
|
|
.Dq Li group
|
|
and
|
|
.Dq Li services
|
|
cachenames.
|
|
.El
|
|
.Sh NOTES
|
|
You can use the
|
|
.Ql #
|
|
symbol at the beginning of the line for comments.
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /etc/nscd.conf" -compact
|
|
.It Pa /etc/nscd.conf
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr nscd 8
|
|
.Sh AUTHORS
|
|
.An Michael Bushkov Aq Mt bushman@FreeBSD.org
|