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@(#)nfsd.8 8.4 (Berkeley) 3/29/95
$FreeBSD: head/usr.sbin/nfsd/nfsd.8 133249 2004-08-07 04:28:56Z imp $
.Dd March 29, 1995 .Dt NFSD 8 .Os .Sh NAME .Nm nfsd .Nd remote .Tn NFS server .Sh SYNOPSIS .Nm .Op Fl ardut .Op Fl n Ar num_servers .Op Fl h Ar bindip .Sh DESCRIPTION The .Nm utility runs on a server machine to service .Tn NFS requests from client machines. At least one .Nm must be running for a machine to operate as a server.
p Unless otherwise specified, four servers for .Tn UDP transport are started.
p The following options are available: l -tag -width Ds t Fl r Register the .Tn NFS service with .Xr rpcbind 8 without creating any servers. This option can be used along with the .Fl u or .Fl t options to re-register NFS if the rpcbind server is restarted. t Fl d Unregister the .Tn NFS service with .Xr rpcbind 8 without creating any servers. t Fl n Specifies how many servers to create. t Fl h Ar bindip Specifies which IP address or hostname to bind to on the local host. This option is recommended when a host has multiple interfaces. Multiple .Fl h options may be specified. t Fl a Specifies that nfsd should bind to the wildcard IP address. This is the default if no .Fl h options are given. It may also be specified in addition to any .Fl 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 Fl t Serve .Tn TCP NFS clients. t Fl u Serve .Tn UDP NFS clients. .El
p For example, .Dq Li "nfsd -u -t -n 6" serves .Tn UDP and .Tn TCP transports using six daemons.
p A server should run enough daemons to handle the maximum level of concurrency from its clients, typically four to six.
p The .Nm utility listens for service requests at the port indicated in the .Tn NFS server specification; see .%T "Network File System Protocol Specification" , RFC1094 and .%T "NFS: Network File System Version 3 Protocol Specification" .
p If .Nm detects that .Tn NFS is not loaded in the running kernel, it will attempt to load a loadable kernel module containing .Tn NFS support using .Xr kldload 2 . If this fails, or no .Tn NFS KLD is available, .Nm will exit with an error.
p If .Nm is to be run on a host with multiple interfaces or interface aliases, use of the .Fl 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 .Nm ipfw utility would then be used to block nfs-related packets that come in on the outside interface.
p The .Nm utility has to be terminated with .Dv SIGUSR1 and cannot be killed with .Dv SIGTERM or .Dv SIGQUIT . The .Nm 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 .Nm just do a .Dq Li "kill -USR1 <PID of master nfsd>" .Sh DIAGNOSTICS .Ex -std .Sh SEE ALSO .Xr nfsstat 1 , .Xr kldload 2 , .Xr nfssvc 2 , .Xr exports 5 , .Xr ipfw 8 , .Xr mountd 8 , .Xr nfsiod 8 , .Xr rpcbind 8 .Sh HISTORY The .Nm utility first appeared in x 4.4 .