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Section: Maintenance Commands (8)
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NAME
nfsd
- remote
NFS
server
SYNOPSIS
nfsd
[-r
]
-words
[-t msk,mtch,hostadr1,hostadr2,...
]
-words
[-u msk,mtch,numprocs
]
[numprocs
]
DESCRIPTION
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.
The options
-u
and
-t
are used to indicate which transport protocols are to be served.
Options available to
nfsd
- -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.
- -t
-
Serve
TCP NFS
clients.
- -u
-
Serve
UDP NFS
clients.
The following arguments to the
-u
or
-t
options are used to specify parameters for service using the respective
protocol:
- msk , mtch
-
These arguments permit restriction of
NFS
services
to a subset of the host addresses. The
msk
and
mtch
are applied to the client host address as follows:
if ((
host_address & msk
) ==
mtch
)
- service the client request
else
- drop the request
- hostadr1 , ...
-
You may also specify zero or more specific host addresses to be accepted
as well as ones that pass the
msk , mtch
test above.
This may only be done for transport protocols that are connection based, such
as
TCP
For the internet domain,
msk , mtch
and
hostadrs
are specified in internet
dot
notation.
- numprocs
-
Specifies how many servers to fork off. This may only be specified for
non-connection based protocols such as
UDP
If neither
-u
or
-t
are specified,
numprocs
servers for
UDP
accepting requests from all clients are started.
If
numprocs
is not specified, it defaults to 1.
For example:
nfsd -u 255.255.255.0,131.104.48.0,4 -t \
255.255.0.0,131.104.0.0,131.102.31.2
- Serves
-
UDP
and
TCP
transports. For
UDP
it runs 4 daemons that accept requests
from any client on subnet 131.104.48.
For
TCP
it accepts connections from any client on network 131.104
plus the client with the address 131.102.31.2.
nfsd -u 255.255.240.0,131.104.0.0,6 -t 0,0
- Serves
-
UDP
and
TCP
transports.
For
UDP
it runs 6 daemons that accept requests from clients with
addresses in the range 131.104.0.x - 131.104.15.x.
For
TCP
it accepts connections from any client.
nfsd -u 0,0,4
- Serves any
-
UDP
client with 4 servers, only.
nfsd 4
- Serves any
-
UDP
client with 4 servers, only. (Compatibility)
A server should typically run enough daemons to handle
the maximum level of concurrency 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.
SEE ALSO
nfsstat(1),
nfssvc(2),
mountd(8),
portmap(8)
BUGS
The client host address restrictions specified here are unrelated to
the mount restrictions specified in
/etc/exports
for
mountd(8).
HISTORY
The
nfsd
command is
Ud .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
- BUGS
-
- HISTORY
-
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Time: 06:35:31 GMT, May 19, 2025