nfsd man page on FreeBSD

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NFSD(8)			  BSD System Manager's Manual		       NFSD(8)

     nfsd — remote NFS server

     nfsd [-ardute] [-n num_servers] [-h bindip]

     The nfsd utility runs on a server machine to service NFS requests from
     client machines.  At least one nfsd must be running for a machine to
     operate as a server.

     Unless otherwise specified, four servers for UDP transport are started.

     The following options are available:

     -r	     Register the NFS service with rpcbind(8) without creating any
	     servers.  This option can be used along with the -u or -t options
	     to re-register NFS if the rpcbind server is restarted.

     -d	     Unregister the NFS service with rpcbind(8) without creating any

     -n	     Specifies how many servers to create.

     -h bindip
	     Specifies which IP address or hostname to bind to on the local
	     host.  This option is recommended when a host has multiple inter‐
	     faces.  Multiple -h options may be specified.

     -a	     Specifies that nfsd should bind to the wildcard IP address.  This
	     is the default if no -h options are given.	 It may also be speci‐
	     fied in addition to any -h options given.	Note that NFS/UDP does
	     not operate properly when bound to the wildcard IP address
	     whether you use -a or do not use -h.

     -t	     Serve TCP NFS clients.

     -u	     Serve UDP NFS clients.

     -e	     Forces nfsd to try and start the experimental server that
	     includes NFSv4 support in it.  If this flag isn't specified, the
	     experimental server will only be started if it is linked into the
	     kernel and the regular one isn't.
	     ie. The kernel is built with the following:
		   # options	   NFSSERVER
		   options	   NFSD

     For example, “nfsd -u -t -n 6” serves UDP and TCP transports using six

     A server should run enough daemons to handle the maximum level of concur‐
     rency from its clients, typically four to six.

     The nfsd utility listens for service requests at the port indicated in
     the NFS server specification; see Network File System Protocol
     Specification, RFC1094, NFS: Network File System Version 3 Protocol
     Specification, RFC1813 and Network File System (NFS) Version 4 Protocol,

     If nfsd detects that NFS is not loaded in the running kernel, it will
     attempt to load a loadable kernel module containing NFS support using
     kldload(2).  If this fails, or no NFS KLD is available, nfsd will exit
     with an error.

     If nfsd is to be run on a host with multiple interfaces or interface
     aliases, use of the -h option is recommended.  If you do not use the
     option NFS may not respond to UDP packets from the same IP address they
     were sent to.  Use of this option is also recommended when securing NFS
     exports on a firewalling machine such that the NFS sockets can only be
     accessed by the inside interface.	The ipfw utility would then be used to
     block nfs-related packets that come in on the outside interface.

     The nfsd utility has to be terminated with SIGUSR1 and cannot be killed
     with SIGTERM or SIGQUIT.  The nfsd utility needs to ignore these signals
     in order to stay alive as long as possible during a shutdown, otherwise
     loopback mounts will not be able to unmount.  If you have to kill nfsd
     just do a “kill -USR1 <PID of master nfsd>”

     The nfsd utility exits 0 on success, and >0 if an error occurs.

     nfsstat(1), kldload(2), nfssvc(2), nfsv4(4), exports(5), gssd(8),
     ipfw(8), mountd(8), nfsiod(8), nfsrevoke(8), nfsuserd(8), rpcbind(8)

     The nfsd utility first appeared in 4.4BSD.

     If nfsd is started when gssd(8) is not running, it will service AUTH_SYS
     requests only. To fix the problem you must kill nfsd and then restart it,
     after the gssd(8) is running.

BSD				March 29, 1995				   BSD

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