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 NFS versions 2,3,4 and the newer version 4.1.
- -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 --no-tcp
- Disable rpc.nfsd from accepting TCP connections from clients.
- -U or --no-udp
- Disable rpc.nfsd from accepting UDP connections from clients.
- -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 NFS
versions 2,3,4 and the newer version 4.1.
- -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, just one thread is
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 8 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.
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