rpcbind(8) - man - phpman

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

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NAME
     rpcbind — universal addresses to RPC program number mapper

SYNOPSIS
     rpcbind [-adhiLlsr]

DESCRIPTION
     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 in‐
     voked.

     When rpcbind is started, it checks that certain name-to-address translation-calls function cor‐
     rectly.  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
     -a      When debugging (-d), do an abort on errors.

     -d      Run in debug mode.  In this mode, rpcbind will log additional information during opera‐
             tion, 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 speci‐
             fied multiple times and can be used to restrict the interfaces rpcbind will respond to.
             When specifying IP addresses with -h, rpcbind will automatically add 127.0.0.1 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 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.

     -r      Turn on remote calls. Cause rpcbind to open up random listening ports. Note that
             rpcinfo need this feature turned on for work properly. (This flag is a Debian exten‐
             sion.)

FILES
     If "/etc/default/rpcbind" exists, rpcbind will use the specified options at launch time rpcbind
     Otherwise rpcbind will try to load configuration from "/etc/rppcbind.conf" rpcbind The default
     options are set as "-w -f".

NOTES
     All RPC servers must be restarted if rpcbind is restarted.

SEE ALSO
     rpcinfo(8)

LINUX PORT
     Aurelien Charbon <aurelien.charbon AT bull.net>

BSD                           September 14, 1992                           BSD