Ubuntu Manpage: rpcbind — universal addresses to RPC program number mapper

Provided by: rpcbind_0.2.3-0.2ubuntu0.16.04.1_amd64

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
     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

-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 is typically necessary when running on a multi-homed
host. 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 specifying IP addresses
with -h, rpcbind will automatically add 127.0.0.1 and if IPv6 is enabled, ::1 to the
list.

-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. Ubuntu note: to retain
backwards compatibility with existing behavior, in releases Xenial and Bionic, the
default for this is enabled, so remote calls are turned on by default. To change the
default to disabled, define the variable -RPCBIND_RMTCALL_DEFAULT_DISABLED (its
value does not matter, it only needs to be defined) in either of the config files,
/etc/default/rpcbind or /etc/rpcbind.conf. This will work only if the service is
started by systemd; this will not work if the service is started by upstart. In
Focal and later, the remote calls default is disabled, and the variable is ignored.

NOTES

     All RPC servers must be restarted if rpcbind is restarted.

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