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28 .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95
42 .Op Fl n Ar num_servers
47 utility runs on a server machine to service
49 requests from client machines.
52 must be running for a machine to operate as a server.
54 Unless otherwise specified, four servers for
56 transport are started.
58 The following options are available:
65 without creating any servers.
66 This option can be used along with the
70 options to re-register NFS if the rpcbind server is restarted.
76 without creating any servers.
78 Specifies how many servers to create.
80 Specifies which IP address or hostname to bind to on the local host.
81 This option is recommended when a host has multiple interfaces.
84 options may be specified.
86 Specifies that nfsd should bind to the wildcard IP address.
87 This is the default if no
90 It may also be specified in addition to any
93 Note that NFS/UDP does not operate properly when
94 bound to the wildcard IP address whether you use -a or do not use -h.
104 The new NFS server that includes NFSv4 support is now the default, so this
105 option is now a no-op and should be considered deprecated.
107 Forces the use of the old NFS server that does not include NFSv4 support
112 .Dq Li "nfsd -u -t -n 6"
117 transports using six daemons.
119 A server should run enough daemons to handle
120 the maximum level of concurrency from its clients,
121 typically four to six.
125 utility listens for service requests at the port indicated in the
127 server specification; see
128 .%T "Network File System Protocol Specification" ,
130 .%T "NFS: Network File System Version 3 Protocol Specification" ,
132 .%T "Network File System (NFS) Version 4 Protocol" ,
139 is not loaded in the running kernel, it will attempt
140 to load a loadable kernel module containing
148 will exit with an error.
152 is to be run on a host with multiple interfaces or interface aliases, use
155 option is recommended.
156 If you do not use the option NFS may not respond to
157 UDP packets from the same IP address they were sent to.
159 is also recommended when securing NFS exports on a firewalling machine such
160 that the NFS sockets can only be accessed by the inside interface.
164 would then be used to block nfs-related packets that come in on the outside
167 If the server has stopped servicing clients and has generated a console message
169 .Dq Li "nfsd server cache flooded..." ,
170 the value for vfs.nfsd.tcphighwater needs to be increased.
171 This should allow the server to again handle requests without a reboot.
172 Also, you may want to consider decreasing the value for
173 vfs.nfsd.tcpcachetimeo to several minutes (in seconds) instead of 12 hours
176 Unfortunately making vfs.nfsd.tcphighwater too large can result in the mbuf
177 limit being reached, as indicated by a console message
179 .Dq Li "kern.ipc.nmbufs limit reached" .
180 If you cannot find values of the above
182 values that work, you can disable the DRC cache for TCP by setting
183 vfs.nfsd.cachetcp to 0.
187 utility has to be terminated with
189 and cannot be killed with
195 utility needs to ignore these signals in order to stay alive as long
196 as possible during a shutdown, otherwise loopback mounts will
197 not be able to unmount.
201 .Dq Li "kill -USR1 <PID of master nfsd>"
210 .Xr stablerestart 5 ,
221 utility first appeared in
228 is not running, it will service AUTH_SYS requests only. To fix the problem
231 and then restart it, after the