mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
154 lines
4.9 KiB
Groff
154 lines
4.9 KiB
Groff
.\" Copyright (c) 1995, 1996
|
|
.\" Bill Paul <wpaul@ctr.columbia.edu>. 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 Bill Paul.
|
|
.\" 4. Neither the name of the author nor the names of contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 2, 1996
|
|
.Dt RPC.YPXFRD 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rpc.ypxfrd
|
|
.Nd "NIS map transfer server"
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl p Ar path
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility is used to speed up the distribution of very large NIS maps
|
|
from NIS master to NIS slave servers.
|
|
The normal method for transfering
|
|
maps involves several steps:
|
|
.Bl -bullet -offset indent
|
|
.It
|
|
The master server calls
|
|
.Xr yppush 8
|
|
to inform the slave servers to start a transfer.
|
|
.It
|
|
The slave servers invoke
|
|
.Xr ypxfr 8 ,
|
|
which reads the entire contents of a map from the master server
|
|
using the yp_all() function.
|
|
.It
|
|
The
|
|
.Xr ypxfr 8
|
|
program then creates a new map database file by using the
|
|
.Xr db 3
|
|
library hash method to store the data that it receives from the server.
|
|
.It
|
|
When all the data has been retrieved,
|
|
.Xr ypxfr 8
|
|
moves the new file into place and sends
|
|
.Xr ypserv 8
|
|
on the local machine a YPPROC_CLEAR to tell it to refresh its
|
|
database handles.
|
|
.El
|
|
.Pp
|
|
This process can take several minutes when there are very large
|
|
maps involved.
|
|
For example: a passwd database with several tens of
|
|
thousands of entries can consume several megabytes of disk space,
|
|
and it can take the
|
|
.Xr db 3
|
|
library package a long time to sort and store all the records
|
|
in a hash database.
|
|
Consider also that there are two sets of map
|
|
files:
|
|
.Pa master.passwd.by{name,uid}
|
|
and
|
|
.Pa passwd.by{name,uid} .
|
|
.Pp
|
|
The
|
|
.Nm
|
|
utility speeds up the transfer process by allowing NIS slave servers to
|
|
simply copy the master server's map files rather than building their
|
|
own from scratch.
|
|
Simply put,
|
|
.Nm
|
|
implements an RPC-based file transfer protocol.
|
|
Transfering even
|
|
a multi-megabyte file in this fashion takes only a few seconds compared
|
|
to the several minutes it would take even a reasonably fast slave server
|
|
to build a new map from scratch.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
utility uses the same access restriction mechanism as
|
|
.Xr ypserv 8 .
|
|
This means that slave servers will only be permitted to transfer
|
|
files if the rules in the
|
|
.Pa securenets
|
|
database permit it (see
|
|
.Xr ypserv 8
|
|
for more information on
|
|
.Pa securenets ) .
|
|
Furthermore, only slave servers using reserved
|
|
ports will be allowed to transfer the
|
|
.Pa master.passwd
|
|
maps.
|
|
.Sh OPTIONS
|
|
The following option is available:
|
|
.Bl -tag -width indent
|
|
.It Fl p Ar path
|
|
This option can be used to override the default path to
|
|
the location of the NIS
|
|
map databases.
|
|
The compiled-in default path is
|
|
.Pa /var/yp .
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width Pa -compact
|
|
.It Pa /var/yp/[domainname]/[maps]
|
|
The NIS maps for a particular NIS domain.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr yp 8 ,
|
|
.Xr yppush 8 ,
|
|
.Xr ypserv 8 ,
|
|
.Xr ypxfr 8
|
|
.Sh AUTHORS
|
|
.An Bill Paul Aq wpaul@ctr.columbia.edu
|
|
.Sh BUGS
|
|
The
|
|
.Fx
|
|
.Nm ypxfrd
|
|
protocol is not compatible with that used by SunOS.
|
|
This is unfortunate
|
|
but unavoidable: Sun's protocol is not freely available, and even if it
|
|
were it would probably not be useful since the SunOS NIS v2 implementation
|
|
uses the original ndbm package for its map databases whereas the
|
|
.Fx
|
|
implementation uses Berkeley DB.
|
|
These two packages use vastly different
|
|
file formats.
|
|
Furthermore, ndbm is byte-order sensitive and not very
|
|
smart about it, meaning that am ndbm database created on a big endian
|
|
system cannot be read on a little endian system.
|