This includes the addition of a new flag "-4" that will force use of the experimental server with nfsv4 support in it. This commit also adds two new man pages to the repository that are NFSv4 specific. One describes the file used by the server to restart nfsv4 services safely. The other is a brief overview of nfsv4 and its setup. Reviewed by: dfr Approved by: kib (mentor)
221 lines
5.4 KiB
Groff
221 lines
5.4 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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.\" 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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.\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95
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.\" $FreeBSD$
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.\"
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.Dd March 29, 1995
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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 ardut4
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.Op Fl n Ar num_servers
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.Op Fl h Ar bindip
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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, four servers 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
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Specifies how many servers to create.
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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 4
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Forces
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.Nm
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to try and start the experimental server that includes NFSv4 support in it.
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If this flag isn't specified, the experimental server will only be started
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if it is linked into the kernel and the regular one isn't.
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.br
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ie. The kernel is built with the following:
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.Bd -literal -offset indent -compact
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# options NFSSERVER
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options NFSD
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.Ed
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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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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 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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