448 lines
14 KiB
Groff
448 lines
14 KiB
Groff
.\" $NetBSD: named.8,v 1.3 2000/06/14 05:54:30 itojun Exp $
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.\"
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.\" ++Copyright++ 1985, 1996
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.\" -
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.\" Copyright (c) 1985, 1996
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.\" The Regents of the University of California. 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies, and that
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.\" the name of Digital Equipment Corporation not be used in advertising or
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.\" publicity pertaining to distribution of the document or software without
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.\" specific, written prior permission.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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.\" WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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.\" CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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.\" DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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.\" PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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.\" ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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.\" SOFTWARE.
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.\" -
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.\" --Copyright--
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.\"
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.\" @(#)named.8 6.6 (Berkeley) 2/14/89
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.\"
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.Dd February 1, 1996
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.Dt NAMED 8
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.Os BSD 4
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.Sh NAME
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.Nm named
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.Nd Internet domain name server (DNS)
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.Sh SYNOPSIS
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.Nm NAMED
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.Op Fl d Ar debuglevel
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.Op Fl p Ar port#
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.Oo Fl Po
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.Cm b Ns \&| Ns Cm c
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.Pc
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.Ar config_file
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.Oc
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.Op Fl f q r v
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.Op Fl u Ar user_name
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.Op Fl g Ar group_name
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.Op Fl t Ar directory
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.Op Fl w Ar directory
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.Op Ar config_file
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.Sh DESCRIPTION
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.Ic Named
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is the Internet domain name server.
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See RFC's 1033, 1034, and 1035 for more information on the Internet
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name-domain system. Without any arguments,
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.Ic named
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will read the default configuration file
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.Pa /etc/named.conf ,
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read any initial data, and listen for queries. A
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.Ar config_file
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argument given at the end of the command line will override any
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.Ar config_file
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specified by using the
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.Dq Fl b
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or
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.Dq Fl c
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flags.
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.Pp
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.Sy NOTE:
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Several of
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.Nm named Ns 's
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options, and much more of its behaviour, can be controlled in the configuration
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file. Please refer to the configuration file guide included with this
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.Sy BIND
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distribution for further information.
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.Pp
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Options are:
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.Bl -tag -width Fl
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.It Fl d Ar debuglevel
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Print debugging information.
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The
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.Ar debuglevel
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is a number determines the level of messages printed. If negative,
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.Ar debuglevel
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is set to
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.Dq 1 .
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.Pp
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.Sy NOTE:
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The new debugging framework is considerably more sophisticated than it
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was in older versions of
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.Nm NAMED .
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The configuration file's
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.Dq Li logging
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statement allows for multiple, distinct levels of debugging for each of
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a large set of categories of events (such as queries, transfers in or out,
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etc.). Please refer to the configuration file guide included with this
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.Sy BIND
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distribution for further information about these extensive new capabilities.
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.It Fl p Ar port#
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Use the specified remote port number; this is the port number to which
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.Nm NAMED
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will send queries. The default value is the standard port number, i.e.,
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the port number returned by
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.Xr getservbyname 3
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for service
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.Dq Li domain .
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.Pp
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.Sy NOTE:
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Previously, the syntax
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.Dq Fl p Ar port# Ns Op Ar \&/localport#
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was supported; the first port was that used when contacting
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.Em remote
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servers, and the second one was the service port bound by the
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.Em local
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instance of
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.Nm NAMED .
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The current usage is equivalent to the old usage without the
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.Ar localport#
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specified; this functionality can be specified with the
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.Dq Li listen-on
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clause of the configuration file's
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.Dq Li options
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statement.
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.It Xo Fl Po
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.Cm b Ns \&| Ns Cm c
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.Pc Ar config_file
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.Xc
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Use an alternate
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.Ar config_file ;
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this argument is overridden by any
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.Ar config_file
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which is specified at the end of the command line.
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The default value is
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.Pa /etc/named.conf .
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.It Fl f
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Run this process in the foreground; don't
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.Xr fork 2
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and daemonize. (The default is to daemonize.)
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.It Fl q
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Trace all incoming queries if
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.Nm NAMED
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has been compiled with
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.Li QRYLOG
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defined.
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.Pp
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.Sy NOTE:
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This option is deprecated in favor of the
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.Dq Li queries
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.Em logging category
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of the configuration file's
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.Dq Li logging
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statement; for more information, please refer to the configuration file guide
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included with this distribution of
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.Sy BIND .
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.It Fl r
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Turns recursion off in the server. Answers can come only from local
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(primary or secondary) zones. This can be used on root servers.
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The default is to use recursion.
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.Pp
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.Sy NOTE:
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This option can be overridden by and is deprecated in favor of the
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.Dq Li recursion
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clause of the configuration file's
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.Dq Li options
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statement.
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.It Fl v
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Report the version and exit.
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.It Fl u Ar user_name
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Specifies the user the server should run as after it initializes. The value
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specified may be either a username or a numeric user id. If the
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.Dq Fl g
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flag is not specified, then the group id used will be the primary group of
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the user specified (initgroups() is called, so all of the user's groups will
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be available to the server).
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.Pp
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.It Fl g Ar group_name
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Specifies the group the server should run as after it initializes. The value
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specified may be either a groupname or a numeric group id.
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.Pp
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.It Fl t Ar directory
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Specifies the directory the server should chroot() into as soon as it is
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finshed processing command line arguments.
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.Pp
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.It Fl w Ar directory
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Sets the working directory of the server. The
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.Dq Li directory
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clause of the configuration file's
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.Dq Li options
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statement overrides any value specified on the command line.
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The default working directory is the current directory
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.Pq Dq \&. .
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.El
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.Pp
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Any additional argument is taken as the name of the configuration file, for
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compatibility with older implementations; as noted above, this argument
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overrides any
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.Ar config_file
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specified by the use of the
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.Dq Fl b
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or
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.Dq Fl c
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flags. If no further argument is given, then the default configuration file
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is used
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.Pq Pa /etc/named.conf .
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.Ss Master File Format
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The master file consists of control information and a list of resource
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records for objects in the zone of the forms:
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.Bd -literal -offset indent
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$INCLUDE <filename> <opt_domain>
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$ORIGIN <domain>
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$TTL <ttl>
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<domain> <opt_ttl> <opt_class> <type> <resource_record_data>
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.Ed
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.Pp
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where:
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.Bl -tag -width "opt_domain "
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.It Ar domain
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is
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.Dq Li \&.
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for root,
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.Dq Li @
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for the current origin, or a standard domain name. If
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.Ar domain
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is a standard domain name that does
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.Em not
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end with
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.Dq Li \&. ,
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the current origin is appended to the domain. Domain names ending with
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.Dq Li \&.
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are unmodified.
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.It Ar opt_domain
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This field is used to define an origin for the data in an included file.
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It is equivalent to placing an
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.Li $ORIGIN
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statement before the first line of the included file. The field is optional.
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Neither the
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.Ar opt_domain
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field nor
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.Li $ORIGIN
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statements in the included file modify the current origin for this file.
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.It Ar ttl
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A integer number that sets the default time-to-live for future records without
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an explicit ttl.
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.It Ar opt_ttl
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An optional integer number for the time-to-live field.
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If not set the ttl is taken from the last $TTL statement.
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If no $TTL statement has occured then the SOA minimum value is used and a
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warning is generated.
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.It Ar opt_class
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The object address type; currently only one type is supported,
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.Dv IN ,
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for objects connected to the DARPA Internet.
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.It Ar type
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This field contains one of the following tokens; the data expected in the
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.Ar resource_record_data
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field is in parentheses:
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.Bl -tag -width "HINFO " -offset indent
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.It Dv A
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a host address (dotted-quad IP address)
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.It Dv NS
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an authoritative name server (domain)
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.It Dv MX
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a mail exchanger (domain), preceded by a preference value (0..32767),
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with lower numeric values representing higher logical preferences.
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.It Dv CNAME
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the canonical name for an alias (domain)
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.It Dv SOA
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marks the start of a zone of authority (domain of originating host,
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domain address of maintainer, a serial number and the following
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parameters in seconds: refresh, retry, expire and minimum TTL (see RFC 883
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and RFC 2308)).
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.It Dv NULL
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a null resource record (no format or data)
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.It Dv RP
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a Responsible Person for some domain name (mailbox, TXT-referral)
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.It Dv PTR
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a domain name pointer (domain)
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.It Dv HINFO
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host information (cpu_type OS_type)
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.El
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.El
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.Pp
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Resource records normally end at the end of a line,
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but may be continued across lines between opening and closing parentheses.
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Comments are introduced by semicolons and continue to the end of the line.
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.Pp
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.Sy NOTE:
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There are other resource record types not shown here. You should
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consult the
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.Sy BIND
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Operations Guide
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.Pq Dq BOG
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for the complete
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list. Some resource record types may have been standardized in newer RFC's
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but not yet implemented in this version of
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.Sy BIND .
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.Ss SOA Record Format
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Each master zone file should begin with an SOA record for the zone.
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An example SOA record is as follows:
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.Bd -literal
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@ IN SOA ucbvax.Berkeley.EDU. rwh.ucbvax.Berkeley.EDU. (
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1989020501 ; serial
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10800 ; refresh
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3600 ; retry
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3600000 ; expire
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86400 ) ; minimum
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.Ed
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.Pp
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The SOA specifies a serial number, which should be changed each time the
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master file is changed. Note that the serial number can be given as a
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dotted number, but this is a
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.Em very
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unwise thing to do since the
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translation to normal integers is via concatenation rather than
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multiplication and addition. You can spell out the year, month, day of
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month, and 0..99 version number and still fit inside the unsigned 32-bit
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size of this field. (It's true that we will have to rethink this strategy in
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the year 4294, but we're not worried about it.)
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.Pp
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Secondary servers
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check the serial number at intervals specified by the refresh time in
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seconds; if the serial number changes, a zone transfer will be done to load
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the new data. If a master server cannot be contacted when a refresh is due,
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the retry time specifies the interval at which refreshes should be attempted.
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If a master server cannot be contacted within the interval given by the
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expire time, all data from the zone is discarded by secondary servers. The
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minimum value is the cache time-to-live for negative answers (RFC 2308).
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.Sh NOTES
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The boot file directives
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.Dq Li domain
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and
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.Dq Li suffixes
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have been
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obsoleted by a more useful, resolver-based implementation of
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suffixing for partially-qualified domain names. The prior mechanisms
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could fail under a number of situations, especially when then local
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nameserver did not have complete information.
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.Pp
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The following signals have the specified effect when sent to the
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server process using the
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.Xr kill 1
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command:
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.Pp
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.Bl -tag -width "SIGWINCH"
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.It Dv SIGHUP
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Causes server to read
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.Pa named.conf
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and reload the database. If the server
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is built with the
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.Li FORCED_RELOAD
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compile-time option, then
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.Dv SIGHUP
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will
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also cause the server to check the serial number on all secondary zones;
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normally, the serial numbers are only checked at the SOA-specified intervals.
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.It Dv SIGINT
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Dumps the current data base and cache to
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.Dq Pa /var/tmp/named_dump.db
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or the value of
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.Dv _PATH_DUMPFILE .
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.It Dv SIGILL
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Dumps statistics data into
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.Pa named.stats
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if the server is compiled with
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.Li -DSTATS .
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Statistics data is appended to the file.
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.It Dv SIGSYS
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Dumps the profiling data in
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.Pa /var/tmp
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if the server is compiled with profiling (server forks, chdirs and exits).
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.It Dv SIGTERM
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Saves any modified dynamic zones to the file system, and shuts down the server.
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.It Dv SIGUSR1
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Turns on debugging; each
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.Dv SIGUSR1
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increments debug level.
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.Po Dv SIGEMT
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on older systems without
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.Dv SIGUSR1 .
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.Pc
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.It Dv SIGUSR2
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Turns off debugging completely.
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.Po Dv SIGFPE
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on older systems without
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.Dv SIGUSR2 .
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.Pc
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.It Dv SIGWINCH
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Toggles logging of all incoming queries via
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.Xr syslog 8
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(requires server to have been built with the
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.Li QRYLOG
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option).
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.El
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.Sh FILES
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.Bl -tag -width "/var/tmp/named_dump.db (_PATH_DUMPFILE) " -compact
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.It Pa /etc/named.conf
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default name server configuration file
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.It Pa /var/run/named.pid Pq Dv _PATH_PIDFILE
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the process id
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.It Pa /var/tmp/named_dump.db Pq Dv _PATH_DUMPFILE
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dump of the name server database
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.It Pa /var/tmp/named.run Pq file: Dv _PATH_DEBUG
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debug output
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.It Pa /var/tmp/named.stats Pq file: Dv _PATH_STATS
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nameserver statistics data
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.El
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.Sh SEE ALSO
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.Xr gethostbyname 3 ,
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.Xr hostname 7 ,
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.Xr kill 1 ,
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.Xr resolver 3 ,
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.Xr resolver 5 ,
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.Xr signal 2 ,
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RFC 882, RFC 883, RFC 973, RFC 974, RFC 1033, RFC 1034, RFC 1035, RFC 1123,
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RFC 2308
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.Dq Name Server Operations Guide for Sy BIND
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.Sh BUGS
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.Nm
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does not support DNS queries/replies over IPv6 transport.
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