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28 .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95
42 .Op Fl n Ar num_servers
44 .Op Fl p Ar pnfs_setup
45 .Op Fl m Ar mirror_level
46 .Op Fl Fl maxthreads Ar max_threads
47 .Op Fl Fl minthreads Ar min_threads
51 utility runs on a server machine to service
53 requests from client machines.
56 must be running for a machine to operate as a server.
58 Unless otherwise specified, eight servers per CPU for
60 transport are started.
62 The following options are available:
69 without creating any servers.
70 This option can be used along with the
74 options to re-register NFS if the rpcbind server is restarted.
80 without creating any servers.
82 Specifies how many servers to create. This option is equivalent to specifying
86 with their respective arguments to
88 .It Fl Fl maxthreads Ar threads
89 Specifies the maximum servers that will be kept around to service requests.
90 .It Fl Fl minthreads Ar threads
91 Specifies the minimum servers that will be kept around to service requests.
93 Specifies which IP address or hostname to bind to on the local host.
94 This option is recommended when a host has multiple interfaces.
97 options may be specified.
99 Specifies that nfsd should bind to the wildcard IP address.
100 This is the default if no
103 It may also be specified in addition to any
106 Note that NFS/UDP does not operate properly when
107 bound to the wildcard IP address whether you use -a or do not use -h.
108 .It Fl p Ar pnfs_setup
109 Enables pNFS support in the server and specifies the information that the
110 daemon needs to start it.
111 This option can only be used on one server and specifies that this server
112 will be the MetaData Server (MDS) for the pNFS service.
113 This can only be done if there is at least one FreeBSD system configured
114 as a Data Server (DS) for it to use.
118 string is a set of fields separated by ',' characters:
120 Each of these fields specifies one Data Server.
121 It consists of a server hostname, followed by a ':'
122 and the directory path where the DS's data storage file system is mounted on
124 At this time, only IPv4 addresses are supported by the interface to the kernel,
127 must resolve to an IPv4 address and support mounts on that address.
128 This needs to be extended to support IPv6 addresses in the near future.
129 This can optionally be followed by a '#' and the mds_path, which is the
130 directory path for an exported file system on this MDS.
131 If this is specified, it means that this DS is to be used to store data
132 files for this mds_path file system only.
133 If this optional component does not exist, the DS will be used to store data
134 files for all exported MDS file systems.
135 The DS storage file systems must be mounted on this system before the
137 is started with this option specified.
141 nfsv4-data0:/data0,nfsv4-data1:/data1
143 would specify two DS servers called nfsv4-data0 and nfsv4-data1 that comprise
144 the data storage component of the pNFS service.
145 These two DSs would be used to store data files for all exported file systems
151 are where the data storage servers exported
152 storage directories are mounted on this system (which will act as the MDS).
154 Whereas, for the example:
156 nfsv4-data0:/data0#/export1,nfsv4-data1:/data1#/export2
158 would specify two DSs as above, however nfsv4-data0 will be used to store
161 and nfsv4-data1 will be used to store data files for
164 .It Fl m Ar mirror_level
165 This option is only meaningful when used with the
170 which defines how many of the DSs will
171 have a copy of a file's data storage file.
172 The default of one implies no mirroring of data storage files on the DSs.
175 would normally be set to 2 to enable mirroring, but
176 can be as high as NFSDEV_MAXMIRRORS.
177 There must be at least
179 DSs for each exported file system on the MDS, as specified in the
182 This implies that, for the above example using "#/export1" and "#/export2",
183 mirroring cannot be done.
184 There would need to be two DS entries for each of "#/export1" and "#/export2"
185 in order to support a
189 If mirroring is enabled, the server must use the Flexible File
191 If mirroring is not enabled, the server will use the File layout
192 by default, but this default can be changed to the Flexible File layout if the
194 vfs.nfsd.default_flexfile
205 Ignored; included for backward compatibility.
209 .Dq Li "nfsd -u -t -n 6"
214 transports using six daemons.
216 A server should run enough daemons to handle
217 the maximum level of concurrency from its clients,
218 typically four to six.
222 utility listens for service requests at the port indicated in the
224 server specification; see
225 .%T "Network File System Protocol Specification" ,
227 .%T "NFS: Network File System Version 3 Protocol Specification" ,
229 .%T "Network File System (NFS) Version 4 Protocol" ,
231 .%T "Network File System (NFS) Version 4 Minor Version 1 Protocol" ,
238 is not loaded in the running kernel, it will attempt
239 to load a loadable kernel module containing
247 will exit with an error.
251 is to be run on a host with multiple interfaces or interface aliases, use
254 option is recommended.
255 If you do not use the option NFS may not respond to
256 UDP packets from the same IP address they were sent to.
258 is also recommended when securing NFS exports on a firewalling machine such
259 that the NFS sockets can only be accessed by the inside interface.
263 would then be used to block nfs-related packets that come in on the outside
266 If the server has stopped servicing clients and has generated a console message
268 .Dq Li "nfsd server cache flooded..." ,
269 the value for vfs.nfsd.tcphighwater needs to be increased.
270 This should allow the server to again handle requests without a reboot.
271 Also, you may want to consider decreasing the value for
272 vfs.nfsd.tcpcachetimeo to several minutes (in seconds) instead of 12 hours
275 Unfortunately making vfs.nfsd.tcphighwater too large can result in the mbuf
276 limit being reached, as indicated by a console message
278 .Dq Li "kern.ipc.nmbufs limit reached" .
279 If you cannot find values of the above
281 values that work, you can disable the DRC cache for TCP by setting
282 vfs.nfsd.cachetcp to 0.
286 utility has to be terminated with
288 and cannot be killed with
294 utility needs to ignore these signals in order to stay alive as long
295 as possible during a shutdown, otherwise loopback mounts will
296 not be able to unmount.
300 .Dq Li "kill -USR1 <PID of master nfsd>"
310 .Xr stablerestart 5 ,
321 utility first appeared in
328 is not running, it will service AUTH_SYS requests only. To fix the problem
331 and then restart it, after the
335 If mirroring is enabled via the
337 option and there are Linux clients doing NFSv4.1 mounts, those clients
338 need to be patched to support the
341 the Flexible File layout or the
343 vfs.nfsd.flexlinuxhack
344 must be set to one on the MDS as a workaround.