fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
199 lines
5.5 KiB
Groff
199 lines
5.5 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. 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. 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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.\" @(#)mountd.8 8.4 (Berkeley) 4/28/95
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.\" $FreeBSD$
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.\"
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.Dd October 24, 2016
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.Dt MOUNTD 8
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.Os
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.Sh NAME
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.Nm mountd
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.Nd service remote
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.Tn NFS
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mount requests
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.Sh SYNOPSIS
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.Nm
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.Op Fl 2delnrS
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.Op Fl h Ar bindip
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.Op Fl p Ar port
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.Op Ar exportsfile ...
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.Sh DESCRIPTION
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The
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.Nm
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utility is the server for
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.Tn NFS
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mount requests from other client machines.
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It listens for service requests at the port indicated in the
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.Tn NFS
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server specification; see
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.%T "Network File System Protocol Specification" ,
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RFC1094, Appendix A and
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.%T "NFS: Network File System Version 3 Protocol Specification" ,
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Appendix I.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl 2
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Allow the administrator to force clients to use only the
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version 2
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.Tn NFS
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protocol to mount file systems from this server.
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.It Fl d
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Output debugging information.
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.Nm
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will not detach from the controlling terminal and will print
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debugging messages to stderr.
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.It Fl e
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Ignored; included for backward compatibility.
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.It Fl h Ar bindip
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Specify specific IP addresses to bind to for TCP and UDP requests.
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This option may be specified multiple times.
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If no
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.Fl h
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option is specified,
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.Nm
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will bind to
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.Dv INADDR_ANY .
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Note that when specifying IP addresses with
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.Fl h ,
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.Nm
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will automatically add
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.Li 127.0.0.1
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and if IPv6 is enabled,
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.Li ::1
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to the list.
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.It Fl l
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Cause all succeeded
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.Nm
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requests to be logged.
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.It Fl n
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Allow non-root mount requests to be served.
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This should only be specified if there are clients such as PC's,
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that require it.
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It will automatically clear the vfs.nfsd.nfs_privport sysctl flag, which
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controls if the kernel will accept NFS requests from reserved ports only.
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.It Fl p Ar port
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Force
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.Nm
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to bind to the specified port, for both
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.Dv AF_INET
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and
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.Dv AF_INET6
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address families.
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This is typically done to ensure that the port which
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.Nm
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binds to is a known quantity which can be used in firewall rulesets.
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If
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.Nm
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cannot bind to this port, an appropriate error will be recorded in
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the system log, and the daemon will then exit.
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.It Fl r
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Allow mount RPCs requests for regular files to be served.
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Although this seems to violate the mount protocol specification,
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some diskless workstations do mount requests for
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their swapfiles and expect them to be regular files.
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Since a regular file cannot be specified in
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.Pa /etc/exports ,
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the entire file system in which the swapfiles resides
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will have to be exported with the
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.Fl alldirs
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flag.
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.It Ar exportsfile
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Specify an alternate location
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for the exports file.
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More than one exports file can be specified.
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.It Fl S
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Tell mountd to suspend/resume execution of the nfsd threads whenever
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the exports list is being reloaded.
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This avoids intermittent access
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errors for clients that do NFS RPCs while the exports are being
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reloaded, but introduces a delay in RPC response while the reload
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is in progress.
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If
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.Nm
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crashes while an exports load is in progress,
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.Nm
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must be restarted to get the nfsd threads running again, if this
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option is used.
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.El
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.Pp
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When
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.Nm
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is started,
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it loads the export host addresses and options into the kernel
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using the
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.Xr mount 2
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system call.
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After changing the exports file,
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a hangup signal should be sent to the
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.Nm
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daemon
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to get it to reload the export information.
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After sending the SIGHUP
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(kill \-s HUP `cat /var/run/mountd.pid`),
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check the syslog output to see if
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.Nm
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logged any parsing
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errors in the exports file.
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.Pp
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If
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.Nm
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detects that the running kernel does not include
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.Tn NFS
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support, it will attempt to load a loadable kernel module containing
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.Tn NFS
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code, using
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.Xr kldload 2 .
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If this fails, or no
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.Tn NFS
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KLD was available,
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.Nm
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exits with an error.
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.Sh FILES
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.Bl -tag -width /var/run/mountd.pid -compact
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.It Pa /etc/exports
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the list of exported file systems
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.It Pa /var/run/mountd.pid
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the pid of the currently running mountd
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.It Pa /var/db/mountdtab
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the current list of remote mounted file systems
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.El
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.Sh SEE ALSO
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.Xr nfsstat 1 ,
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.Xr kldload 2 ,
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.Xr nfsv4 4 ,
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.Xr exports 5 ,
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.Xr nfsd 8 ,
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.Xr rpcbind 8 ,
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.Xr showmount 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Bx 4.4 .
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