1.\" Copyright (c) 1989, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)exports.5 5.2 (Berkeley) 5/10/91 33.\" 34.Dd May 10, 1991 35.Dt EXPORTS 5 36.Os 37.Sh NAME 38.Nm exports 39.Nd define remote mount points for 40.Tn NFS 41mount requests 42.Sh SYNOPSIS 43.Nm exports 44.Sh DESCRIPTION 45The 46.Nm exports 47file 48specifies remote mount points for the 49.Tn NFS 50mount protocol per the 51.Tn NFS 52server specification; see 53.%T "Network File System Protocol Specification \\*(tNRFC\\*(sP 1094" . 54.Pp 55Each line in the file specifies one remote mount point. 56The first field is the mount point directory path followed 57optionally by export options and specific hosts separated by white space. 58Only the first entry for a given local file system may specify the export 59options, since these are handled on a 60.Em per local file system 61basis. 62If no specific hosts are specified, 63the mount point is exported to all hosts. 64.Pp 65The export options are as follows: 66.Sm off 67.Fl root No = Aq Sy uid 68.Sm on 69specifies how to map root's uid (default -2). 70The option 71.Fl r 72is synonyms for 73.Fl root 74in an effort to be backward compatible with older export file formats. 75.Pp 76.Fl ro 77specifies that the file system should be exported Read-only 78(default Read/Write). 79The option 80.Fl o 81is synonyms for 82.Fl ro 83in an effort to be backward compatible with older export file formats. 84.Pp 85For example: 86.Bd -literal -offset indent 87/usr -root=0 rickers snowhite.cis.uoguelph.ca 88/usr/local 131.104.48.16 89/u -root=5 90/u2 -ro 91.Ed 92.Pp 93Given that 94.Sy /usr , 95.Sy /u 96and 97.Sy /u2 98are 99local file system mount points, the above example specifies the following: 100.Bd -filled -offset indent 101.Sy /usr 102is exported to hosts 103.Em rickers 104and 105.Em snowhite.cis.uoguelph.ca 106with 107root mapped to root. 108.Pp 109.Sy /usr/local 110is exported to host 111.Em 131.104.48.16 112with root mapped to root. 113.Pp 114.Sy /u 115is exported to all hosts with root mapped to uid 5. 116.Pp 117.Sy /u2 118is exported to all hosts Read-only with root mapped to -2. 119.Ed 120.Pp 121Note that 122.Dq Li "/usr/local -root=5" 123would have been incorrect, 124since 125.Sy /usr 126and 127.Sy /usr/local 128reside in the same local file system. 129.Sh FILES 130.Bl -tag -width /etc/exports -compact 131.It Pa /etc/exports 132The remote mount point file 133.Nm exports 134resides in 135.Pa /etc . 136.El 137.Sh SEE ALSO 138.Xr mountd 8 , 139.Xr nfsd 8 , 140.Xr showmount 8 141.Sh BUGS 142It would be nice if the export options were not tied to local mount points. 143.Sh HISTORY 144The 145.Nm 146file format is 147.Ud . 148