158 lines
4.4 KiB
Groff
158 lines
4.4 KiB
Groff
.\" Copyright (c) 1989, 1991 The Regents of the University of California.
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.\" 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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.\" from: @(#)exports.5 5.2 (Berkeley) 5/10/91
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.\" $Id: exports.5,v 1.6 1994/01/06 13:51:55 deraadt Exp $
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.\"
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.Dd May 10, 1991
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.Dt EXPORTS 5
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.Os
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.Sh NAME
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.Nm exports
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.Nd define remote mount points for
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.Tn NFS
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mount requests
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.Sh SYNOPSIS
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.Nm exports
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.Sh DESCRIPTION
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The
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.Nm exports
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file
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specifies remote mount points for the
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.Tn NFS
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mount protocol per the
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.Tn NFS
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server specification; see
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.%T "Network File System Protocol Specification \\*(tNRFC\\*(sP 1094" .
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.Pp
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Each line in the file specifies one remote mount point.
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The first field is the mount point path (a directory or regular file) followed
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optionally by export options and specific hosts separated by white space.
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Only the first entry for a given local file system may specify the export
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options, since these are handled on a
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.Em per local file system
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basis.
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If no specific hosts are specified,
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the mount point is exported to all hosts.
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.Pp
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The export options are as follows:
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.Sm off
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.Fl root No = Aq Sy uid
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.Sm on
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specifies how to map root's uid (default -2).
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The option
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.Fl r
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is synonyms for
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.Fl root
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in an effort to be backward compatible with older export file formats.
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.Pp
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.Fl ro
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specifies that the file system should be exported Read-only
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(default Read/Write).
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The option
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.Fl o
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is synonyms for
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.Fl ro
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in an effort to be backward compatible with older export file formats.
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.Pp
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.Fl alldirs
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specifies that all subdirectories of the given directory are exported.
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This is sometimes necessary, e.g. for PCNFS spool directories.
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The option
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.Fl a
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is synonym for
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.Fl alldirs.
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.Pp
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For example:
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.Bd -literal -offset indent
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/usr -root=0 rickers snowhite.cis.uoguelph.ca
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/usr/local 131.104.48.16
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/u -root=5
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/u2 -ro -alldirs
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.Ed
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.Pp
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Given that
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.Sy /usr ,
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.Sy /u
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and
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.Sy /u2
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are
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local file system mount points, the above example specifies the following:
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.Bd -filled -offset indent
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.Sy /usr
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is exported to hosts
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.Em rickers
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and
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.Em snowhite.cis.uoguelph.ca
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with
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root mapped to root.
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.Pp
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.Sy /usr/local
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is exported to host
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.Em 131.104.48.16
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with root mapped to root.
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.Pp
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.Sy /u
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is exported to all hosts with root mapped to uid 5.
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.Pp
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.Sy /u2
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is exported to all hosts Read-only with root mapped to -2. All subdirectories
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of /u2 may be mounted by remote hosts.
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.Ed
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.Pp
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Note that
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.Dq Li "/usr/local -root=5"
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would have been incorrect,
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since
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.Sy /usr
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and
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.Sy /usr/local
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reside in the same local file system.
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.Sh FILES
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.Bl -tag -width /etc/exports -compact
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.It Pa /etc/exports
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The remote mount point file
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.Nm exports
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resides in
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.Pa /etc .
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.El
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.Sh SEE ALSO
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.Xr mountd 8 ,
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.Xr nfsd 8 ,
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.Xr showmount 8
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.Sh BUGS
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It would be nice if the export options were not tied to local mount points.
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.Sh HISTORY
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The
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.Nm
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file format is
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.Ud .
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