rpcbind(8) — Linux manual page


RPCBIND(8)             BSD 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 invoked.

     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 instead.

     -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

     -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 2022-12-17.  (At that
     time, the date of the most recent commit that was found in the
     repository was 2022-07-12.)  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

BSD                        September 14, 1992                        BSD

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