rpc.nfsd - NFS server process
/usr/sbin/rpc.nfsd [options] nproc
program implements the user level part of the NFS service.
The main functionality is handled by the nfsd
kernel module. The user
space program merely specifies what sort of sockets the kernel service should
listen on, what NFS versions it should support, and how many kernel threads it
server provides an ancillary service needed to satisfy
mount requests by NFS clients.
- -d or --debug
- enable logging of debugging messages
- -H or --host hostname
- specify a particular hostname (or address) that NFS requests will be
accepted on. By default, rpc.nfsd will accept NFS requests on all
known network addresses. Note that lockd (which performs file
locking services for NFS) may still accept request on all known network
addresses. This may change in future releases of the Linux Kernel. This
option can be used multiple time to listen to more than one
- -p or --port port
- specify a different port to listen on for NFS requests. By default,
rpc.nfsd will listen on port 2049.
- -r or --rdma
- specify that NFS requests on the standard RDMA port ("nfsrdma",
port 20049) should be honored.
- Listen for RDMA requests on an alternate port - may be a number or a name
listed in /etc/services.
- -N or --no-nfs-version vers
- This option can be used to request that rpc.nfsd does not offer
certain versions of NFS. The current version of rpc.nfsd can
support major NFS versions 2,3,4 and the minor versions 4.0, 4.1 and
- -s or --syslog
- By default, rpc.nfsd logs error messages (and debug messages, if
enabled) to stderr. This option makes rpc.nfsd log these messages
to syslog instead. Note that errors encountered during option processing
will still be logged to stderr regardless of this option.
- -t or --tcp
- Instruct the kernel nfs server to open and listen on a TCP socket. This is
- -T or --no-tcp
- Instruct the kernel nfs server not to open and listen on a TCP
- -u or --udp
- Instruct the kernel nfs server to open and listen on a UDP socket.
- -U or --no-udp
- Instruct the kernel nfs server not to open and listen on a UDP socket.
This is the default.
- -V or --nfs-version vers
- This option can be used to request that rpc.nfsd offer certain
versions of NFS. The current version of rpc.nfsd can support major
NFS versions 2,3,4 and the minor versions 4.0, 4.1 and 4.2.
- -L or --lease-time seconds
- Set the lease-time used for NFSv4. This corresponds to how often clients
need to confirm their state with the server. Valid range is from 10 to
- -G or --grace-time seconds
- Set the grace-time used for NFSv4 and NLM (for NFSv2 and NFSv3). New file
open requests (NFSv4) and new file locks (NLM) will not be allowed until
after this time has passed to allow clients to recover state.
- specify the number of NFS server threads. By default, eight threads are
started. However, for optimum performance several threads should be used.
The actual figure depends on the number of and the work load created by
the NFS clients, but a useful starting point is eight threads. Effects of
modifying that number can be checked using the nfsstat(8)
Note that if the NFS server is already running, then the options for specifying
host, port, and protocol will be ignored. The number of processes given will
be the only option considered, and the number of active nfsd
will be increased or decreased to match this number. In particular rpc.nfsd
will stop all threads and thus close any open connections.
Many of the options that can be set on the command line can also be controlled
through values set in the [nfsd]
section of the /etc/nfs.conf
configuration file. Values recognized include:
- The number of threads to start.
- A host name, or comma separated list of host names, that rpc.nfsd
will listen on. Use of the --host option replaces all host names
- The grace time, for both NFSv4 and NLM, in seconds.
- The lease time for NFSv4, in seconds.
- Set the port for TCP/UDP to bind to.
- Set RDMA port. Use "rdma=nfsrdma" to enable standard port.
- Enable (with "on" or "yes" etc) or disable
("off", "no") UDP support.
- Enable or disable TCP support.
- Enable or disable a major NFS version. 3 and 4 are normally enabled by
- Setting these to "off" or similar will disable the selected
minor versions. Setting to "on" will enable them. The default
values are determined by the kernel, and usually minor versions default to
being enabled once the implementation is sufficiently complete.
If the program is built with TI-RPC support, it will enable any protocol and
address family combinations that are marked visible in the netconfig
Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of