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

     nfsd -- remote NFS	server

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

     Nfsd runs on a server machine to service NFS requests from	client ma-
     chines.  At least one nfsd	must be	running	for a machine to operate as a

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

     The following options are available:

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

     -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.

     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.

     Nfsd listens for service requests at the port indicated in	the NFS	server
     specification; see	Network	File System Protocol Specification, RFC1094
     and NFS: Network File System Version 3 Protocol Specification.

     If	nfsd detects that NFS is not loaded in the running kernel, it will at-
     tempt to load a loadable kernel module containing NFS support using
     kldload(8)	by way of vfsload(3).  If this fails, or no NFS	KLD is avail-
     able, 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 op-
     tion 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.	Ipfw would then	be used	to block nfs-
     related packets that come in on the outside interface.

     nfsd has to be terminated with SIGUSR1 and	cannot be killed with SIGTERM
     or	SIGQUIT.  nfsd 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), nfssvc(2), kldload(8),	mountd(8), nfsiod(8), portmap(8),

     The nfsd utility first appeared in	4.4BSD.

BSD				March 29, 1995				   BSD


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