.\"
.\" Copyright (c) 1994 Jason R. Thorpe
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by Jason Thorpe.
.\" 4. Neither the name of the author nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
.\"
.\"     $Id: ypbind.8,v 1.2 1995/10/18 10:58:56 deraadt Exp $
.\"
.Dd October 25, 1994
.Dt YPBIND 8
.Os
.Sh NAME
.Nm ypbind
.Nd create and maintain a binding to a YP server
.Sh SYNOPSIS
.Nm ypbind
.Op Fl ypset
.Nm ypbind
.Op Fl ypsetme
.Sh DESCRIPTION
.Nm Ypbind
finds the server for a particular YP domain and stores information about it
in a
.Pa binding file.
This binding information includes the IP address of the server associated with
that particular domain and which port the server is using.  This information
is stored in the directory
.Pa /var/yp/binding
in a file named with the convention
.Pa domainname.version.
(The YP system only supplies information on version 2.)
.Pp
When
.Nm ypbind
starts, it broadcasts looking for a process willing to serve maps for the
client's domain.  Once a binding is established,
.Nm ypbind
maintains this binding by periodically communicating with the server to which
it is bound.  If the binding is somehow lost, e.g by server reboot,
.Nm ypbind
marks the domain as unbound and attempts to re-establish the binding.
When the binding is once again successful,
.Nm ypbind
marks the domain as bound and resumes its periodic check.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl ypset
.Xr ypset 8
may be used to change the server to which a domain is bound.
.It Fl ypsetme
.Xr ypset 8
may be used only from this machine to change the server
to which a domain is bound.
.El
.Pp
The
.Fl ypset
and
.Fl ypsetme
options are dangerous and should be avoided.
.Pp
If the directory
.Pa /var/yp
exists, YP is started automatically at boot time by
.Pa /etc/rc .
.Sh FILES
.Pa /var/yp/bindings/domainname.version
- binding file for domainname
.Sh SEE ALSO
.Xr domainname 1 ,
.Xr ypcat 1 ,
.Xr ypmatch 1 ,
.Xr yppoll 8 ,
.Xr ypset 8 ,
.Xr ypwhich 1 ,
.Xr yp 8
.Sh AUTHOR
Theo De Raadt