nfsd(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFIGURATION FILE | NOTES | SEE ALSO | AUTHOR | COLOPHON

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.

       --rdma=port
              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 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  --tcp
              Instruct the kernel nfs server to open and listen on a TCP
              socket. This is the default.

       -T  or  --no-tcp
              Instruct the kernel nfs server not to open and listen on a
              TCP socket.

       -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 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.

CONFIGURATION FILE         top

       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:

       threads
              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.

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

       lease-time
              The lease time for NFSv4, in seconds.

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

       rdma   Enable RDMA port (with "on" or "yes" etc) on the standard
              port ("nfsrdma", port 20049).

       rdma-port
              Set an alternate RDMA port.

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

       TCP    Enable or disable TCP support.

       vers2

       vers3

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

       vers4.1

       vers4.2
              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 others.

COLOPHON         top

       This page is part of the nfs-utils (NFS utilities) project.
       Information about the project can be found at 
       ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩.  If you have a
       bug report for this manual page, see
       ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩.  This page was
       obtained from the project's upstream Git repository
       ⟨http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=summary⟩ on
       2021-06-20.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-06-10.)  If you
       discover any rendering problems in this HTML version 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
       manual page), send a mail to man-pages@man7.org

                               20 Feb 2014                   rpc.nfsd(8)

Pages that refer to this page: exports(5)nfs(5)nfs.conf(5)nfsd(7)mount(8)mountd(8)nfsconf(8)nfsdclnts(8)nfsstat(8)rpcdebug(8)showmount(8)statd(8)