rpc.nfsd(8)                System Manager's Manual               rpc.nfsd(8)

NAME         top

       rpc.nfsd - NFS server process

SYNOPSIS         top

       /usr/sbin/rpc.nfsd [options] nproc

DESCRIPTION         top

       The rpc.nfsd 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 should use.

       The rpc.mountd server provides an ancillary service needed to satisfy
       mount requests by NFS clients.

OPTIONS         top

       -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 interface.

       -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
              4.1 and 4.2.

       -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
              major NFS versions 2,3,4 and the minor versions 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 3600 seconds.

       -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.

       nproc  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) program.

       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 processes will be increased or decreased to match this
       number.  In particular rpc.nfsd 0 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.

       host   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 listed here.

              The grace time, for both NFSv4 and NLM, in seconds.

              The lease time for NFSv4, in seconds.

       port   Set the port for TCP/UDP to bind to.

       rdma   Set RDMA port.  Use "rdma=nfsrdma" to enable standard port.

       UDP    Enable (with "on" or "yes" etc) or disable ("off", "no") UDP

       TCP    Enable or disable TCP support.



       vers4  Enable or disable a major NFS version.  3 and 4 are normally
              enabled by default.


              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.

NOTES         top

       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 database.

SEE ALSO         top

       nfsd(7), rpc.mountd(8), exports(5), exportfs(8), nfs.conf(5),
       rpc.rquotad(8), nfsstat(8), netconfig(5).

AUTHOR         top

       Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of

COLOPHON         top

       This page is part of the nfs-utils (NFS utilities) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, see 
       ⟨⟩.  This page was
       obtained from the project's upstream Git repository 
       ⟨;a=summary⟩ on
       2017-03-13.  If you discover any rendering problems in this HTML ver‐
       sion of the page, or you believe there is a better or more up-to-date
       source for the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original man‐
       ual page), send a mail to

                                 20 Feb 2014                     rpc.nfsd(8)