rpcbind(8) — Linux manual page


RPCBIND(8)               System Manager's Manual              RPCBIND(8)

NAME         top

       rpcbind — universal addresses to RPC program number mapper

SYNOPSIS         top

       rpcbind [-adhiLls]

DESCRIPTION         top

       The rpcbind utility is a server that converts RPC program numbers
       into universal addresses.  It must be running on the host to be
       able to make RPC calls on a server on that machine.

       When an RPC service is started, it tells rpcbind the address at
       which it is listening, and the RPC program numbers it is prepared
       to serve.  When a client wishes to make an RPC call to a given
       program number, it first contacts rpcbind on the server machine
       to determine the address where RPC requests should be sent.

       The rpcbind utility should be started before any other RPC
       service.  Normally, standard RPC servers are started by port
       monitors, so rpcbind must be started before port monitors are

       When rpcbind is started, it checks that certain name-to-address
       translation-calls function correctly.  If they fail, the network
       configuration databases may be corrupt.  Since RPC services
       cannot function correctly in this situation, rpcbind reports the
       condition and terminates.

       The rpcbind utility can only be started by the super-user.

OPTIONS         top

       -a      When debugging (-d), do an abort on errors.

       -d      Run in debug mode.  In this mode, rpcbind will log
               additional information during operation, and will abort
               on certain errors if -a is also specified.  With this
               option, the name-to-address translation consistency
               checks are shown in detail.

       -f      Do not fork and become a background process.

       -h      Specify specific IP addresses to bind to for UDP
               requests.  This option may be specified multiple times
               and can be used to restrict the interfaces rpcbind will
               respond to.  When specifying IP addresses with -h,
               rpcbind will automatically add and if IPv6 is
               enabled, ::1 to the list.  If no -h option is specified,
               rpcbind will bind to INADDR_ANY, which could lead to
               problems on a multi-homed host due to rpcbind returning a
               UDP packet from a different IP address than it was sent
               to.  Note that when rpcbind is controlled via systemd's
               socket activation, the -h option is ignored. In this
               case, you need to edit the ListenStream and ListenDgram
               definitions in /usr/lib/systemd/system/rpcbind.socket

       -i      “Insecure” mode.  Allow calls to SET and UNSET from any
               host.  Normally rpcbind accepts these requests only from
               the loopback interface for security reasons.  This change
               is necessary for programs that were compiled with earlier
               versions of the rpc library and do not make those
               requests using the loopback interface.

       -l      Turn on libwrap connection logging.

       -s      Cause rpcbind to change to the user daemon as soon as
               possible.  This causes rpcbind to use non-privileged
               ports for outgoing connections, preventing non-privileged
               clients from using rpcbind to connect to services from a
               privileged port.

       -w      Cause rpcbind to do a "warm start" by read a state file
               when rpcbind starts up. The state file is created when
               rpcbind terminates.

NOTES         top

       All RPC servers must be restarted if rpcbind is restarted.

SEE ALSO         top


LINUX PORT         top

COLOPHON         top

       This page is part of the rpcbind (convert RPC numbers to
       universal addresses) project.  Information about the project can
       be found at http://sourceforge.net/projects/rpcbind/.  If you
       have a bug report for this manual page, see
       ⟨http://sourceforge.net/p/rpcbind/bugs/?source=navbar⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨git://linux-nfs.org/~steved/rpcbind⟩ on 2024-06-14.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2024-03-18.)  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

GNU                        September 14, 1992                 RPCBIND(8)

Pages that refer to this page: statd(8)