NAME¶
rpcbind —
universal addresses to RPC
program number mapper
SYNOPSIS¶
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 not fork when it starts, will print 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.
- -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.
NOTES¶
All RPC servers must be restarted if
rpcbind is restarted.
SEE ALSO¶
rpcbind(3),
rpcinfo(7)
LINUX PORT¶
Aurelien Charbon <aurelien.charbon@bull.net>
