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
241 lines
6.3 KiB
Groff
241 lines
6.3 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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.\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95
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.\" $FreeBSD$
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.\"
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.Dd April 25, 2015
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.Dt NFSD 8
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.Os
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.Sh NAME
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.Nm nfsd
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.Nd remote
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.Tn NFS
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server
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.Sh SYNOPSIS
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.Nm
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.Op Fl ardute
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.Op Fl n Ar num_servers
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.Op Fl h Ar bindip
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.Op Fl Fl maxthreads Ar max_threads
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.Op Fl Fl minthreads Ar min_threads
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.Sh DESCRIPTION
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The
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.Nm
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utility runs on a server machine to service
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.Tn NFS
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requests from client machines.
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At least one
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.Nm
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must be running for a machine to operate as a server.
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.Pp
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Unless otherwise specified, eight servers per CPU for
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.Tn UDP
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transport are started.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl r
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Register the
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.Tn NFS
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service with
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.Xr rpcbind 8
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without creating any servers.
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This option can be used along with the
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.Fl u
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or
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.Fl t
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options to re-register NFS if the rpcbind server is restarted.
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.It Fl d
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Unregister the
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.Tn NFS
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service with
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.Xr rpcbind 8
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without creating any servers.
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.It Fl n Ar threads
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Specifies how many servers to create. This option is equivalent to specifying
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.Fl Fl maxthreads
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and
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.Fl Fl minthreads
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with their respective arguments to
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.Ar threads .
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.It Fl Fl maxthreads Ar threads
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Specifies the maximum servers that will be kept around to service requests.
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.It Fl Fl minthreads Ar threads
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Specifies the minimum servers that will be kept around to service requests.
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.It Fl h Ar bindip
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Specifies which IP address or hostname to bind to on the local host.
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This option is recommended when a host has multiple interfaces.
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Multiple
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.Fl h
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options may be specified.
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.It Fl a
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Specifies that nfsd should bind to the wildcard IP address.
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This is the default if no
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.Fl h
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options are given.
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It may also be specified in addition to any
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.Fl h
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options given.
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Note that NFS/UDP does not operate properly when
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bound to the wildcard IP address whether you use -a or do not use -h.
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.It Fl t
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Serve
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.Tn TCP NFS
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clients.
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.It Fl u
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Serve
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.Tn UDP NFS
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clients.
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.It Fl e
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Ignored; included for backward compatibility.
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.El
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.Pp
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For example,
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.Dq Li "nfsd -u -t -n 6"
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serves
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.Tn UDP
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and
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.Tn TCP
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transports using six daemons.
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.Pp
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A server should run enough daemons to handle
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the maximum level of concurrency from its clients,
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typically four to six.
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.Pp
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The
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.Nm
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utility 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,
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.%T "NFS: Network File System Version 3 Protocol Specification" ,
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RFC1813 and
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.%T "Network File System (NFS) Version 4 Protocol" ,
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RFC3530.
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.Pp
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If
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.Nm
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detects that
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.Tn NFS
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is not loaded in the running kernel, it will attempt
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to load a loadable kernel module containing
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.Tn NFS
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support 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 is available,
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.Nm
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will exit with an error.
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.Pp
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If
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.Nm
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is to be run on a host with multiple interfaces or interface aliases, use
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of the
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.Fl h
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option is recommended.
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If you do not use the option NFS may not respond to
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UDP packets from the same IP address they were sent to.
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Use of this option
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is also recommended when securing NFS exports on a firewalling machine such
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that the NFS sockets can only be accessed by the inside interface.
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The
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.Nm ipfw
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utility
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would then be used to block nfs-related packets that come in on the outside
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interface.
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.Pp
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If the server has stopped servicing clients and has generated a console message
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like
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.Dq Li "nfsd server cache flooded..." ,
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the value for vfs.nfsd.tcphighwater needs to be increased.
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This should allow the server to again handle requests without a reboot.
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Also, you may want to consider decreasing the value for
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vfs.nfsd.tcpcachetimeo to several minutes (in seconds) instead of 12 hours
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when this occurs.
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.Pp
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Unfortunately making vfs.nfsd.tcphighwater too large can result in the mbuf
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limit being reached, as indicated by a console message
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like
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.Dq Li "kern.ipc.nmbufs limit reached" .
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If you cannot find values of the above
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.Nm sysctl
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values that work, you can disable the DRC cache for TCP by setting
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vfs.nfsd.cachetcp to 0.
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.Pp
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The
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.Nm
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utility has to be terminated with
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.Dv SIGUSR1
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and cannot be killed with
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.Dv SIGTERM
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or
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.Dv SIGQUIT .
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The
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.Nm
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utility needs to ignore these signals in order to stay alive as long
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as possible during a shutdown, otherwise loopback mounts will
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not be able to unmount.
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If you have to kill
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.Nm
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just do a
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.Dq Li "kill -USR1 <PID of master nfsd>"
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.Sh EXIT STATUS
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.Ex -std
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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 nfssvc 2 ,
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.Xr nfsv4 4 ,
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.Xr exports 5 ,
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.Xr stablerestart 5 ,
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.Xr gssd 8 ,
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.Xr ipfw 8 ,
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.Xr mountd 8 ,
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.Xr nfsiod 8 ,
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.Xr nfsrevoke 8 ,
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.Xr nfsuserd 8 ,
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.Xr rpcbind 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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.Sh BUGS
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If
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.Nm
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is started when
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.Xr gssd 8
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is not running, it will service AUTH_SYS requests only. To fix the problem
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you must kill
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.Nm
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and then restart it, after the
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.Xr gssd 8
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is running.
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