169 lines
4.5 KiB
Groff
169 lines
4.5 KiB
Groff
.\" $NetBSD: ypbind.8,v 1.22 2017/07/03 21:35:32 wiz Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 14, 2014
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.Dt YPBIND 8
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.Os
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.Sh NAME
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.Nm ypbind
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.Nd create and maintain a binding to a NIS server
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.Sh SYNOPSIS
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.Nm
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.Op Fl broadcast
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.Op Fl insecure
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.Op Fl ypset
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.Op Fl ypsetme
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.Sh DESCRIPTION
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.Nm
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finds the server for a particular
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.Tn NIS
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domain and stores information about it
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in a
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.Dq binding file .
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This binding information includes the IP address of the server associated with
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that particular domain and which port the server is using.
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This information is stored in the directory
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.Pa /var/yp/binding
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in a file named with the convention
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.Pa <domain>.version ,
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where
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.Aq domain
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is the relevant domain.
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The
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.Tn NIS
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system only supplies information on version 2.
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.Pp
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If
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.Nm
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is started without the
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.Fl broadcast
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option,
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.Nm
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steps through the list of
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.Tn NIS
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servers specified in
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.Pa /var/yp/binding/<domain>.ypservers
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and contacts each in turn attempting to bind to that server.
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It is strongly recommended that these hosts are in the local
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hosts file, and that hosts are looked up in local files before
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the
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.Tn NIS
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hosts map.
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.Pp
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If
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.Nm
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is started with the
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.Fl broadcast
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option, or if
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.Pa /var/yp/binding/<domain>.ypservers
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does not exist,
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.Nm
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broadcasts to find a process willing to serve maps for the
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client's domain.
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.Pp
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Once a binding is established,
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.Nm
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maintains this binding by periodically communicating with the server to which
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it is bound.
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If the binding is somehow lost, e.g by server reboot,
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.Nm
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marks the domain as unbound and attempts to re-establish the binding.
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If a binding cannot be re-established within 60 seconds,
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.Nm
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backs off exponentially to trying only once per hour.
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.Pp
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The options are as follows:
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.Bl -tag -width "-broadcast"
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.It Fl broadcast
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sends a broadcast requesting a
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.Tn NIS
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server to which to bind.
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.It Fl insecure
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do not require that the server is running on a reserved port.
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This may be necessary when connecting to
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.Tn SunOS 3.x
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or
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.Tn ULTRIX
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.Tn NIS
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servers.
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.It Fl ypset
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.Xr ypset 8
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may be used from anywhere to change the server to which a domain is bound.
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.It Fl ypsetme
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.Xr ypset 8
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may be used only from this machine to change the server
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to which a domain is bound.
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.El
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.Pp
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The
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.Fl broadcast ,
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.Fl ypset ,
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and
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.Fl ypsetme
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options are inherently insecure and should be avoided.
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.Sh SIGNALS
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.Nm
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responds to the following signals:
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.Bl -tag -width TERM -compact
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.It Dv HUP
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causes
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.Nm
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to immediately retry any unbound domains that are currently in
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exponential backoff.
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Use this to resume immediately after a long network outage is
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resolved.
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.El
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.Sh FILES
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.Pa /var/yp/binding/<domain>.version
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- binding file for <domain>.
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.Pa /var/yp/binding/<domain>.ypservers
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- explicit list of servers to bind to for <domain>.
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.Sh DIAGNOSTICS
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Messages are sent to
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.Xr syslogd 8
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using the
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.Dv LOG_DAEMON
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facility.
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.Sh SEE ALSO
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.Xr domainname 1 ,
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.Xr ypcat 1 ,
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.Xr ypmatch 1 ,
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.Xr ypwhich 1 ,
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.Xr nis 8 ,
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.Xr yppoll 8 ,
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.Xr ypset 8
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.Sh AUTHORS
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.An -nosplit
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This version of
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.Nm
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was originally implemented by
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.An Theo de Raadt .
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The ypservers support was implemented by
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.An Luke Mewburn .
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