Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
NFSD(8)                 FreeBSD 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
     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 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
     attempt 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
     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.  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), exports(5), kldload(8), mountd(8), nfsiod(8),
     portmap(8), ipfw(8)

     The nfsd utility first appeared in 4.4BSD.

FreeBSD 4.10                    March 29, 1995                    FreeBSD 4.10


Want to link to this manual page? Use this URL:

home | help