ypbind - NIS binding process
[-c] [-d | -debug] [-verbose] [-n | -forground] [-broadcast] [-broken-server]
[-ypset] [-ypsetme] [-no-ping] [-f configfile] [-local-only]
[-ping-interval ping-interval] [-rebind-interval]
finds the server for NIS domains and maintains the NIS binding
information. The client (normally the NIS routines in the standard C library)
could get the information over RPC from ypbind
or read the binding
files. The binding files resides in the directory /var/yp/binding and are
conventionally named [domainname].[version]
. The supported versions are
1 and 2. There could be several such files since it is possible for an NIS
client to be bound to more than one domain.
After a binding has been established, ypbind
will send YPPROC_DOMAIN
requests to the current NIS server at 20 seconds intervals. If it doesn't get
an response or the NIS server reports that he doesn't have this domain any
will search for a new NIS server. All 15 minutes
will check to see if the current NIS server is the fastest. If
it find a server which answers faster, it will switch to this server. You
could tell ypbind
to use network broadcasts to find a new server, what
is insecure, or you could give it a list of known secure servers. In this case
will send a ping to all servers and binds to first one which
Unless the option -debug
is used, ypbind detaches itself from the
controlling terminal and puts itself into background. ypbind
(3) for logging errors and warnings. At startup or when receiving
signal SIGHUP, ypbind
parses the file /etc/yp.conf and tries to use the
entries for its initial binding.
A broadcast entry in the configuration file will overwrite a ypserver/server
entry and a ypserver/server entry broadcast. If all given server are down,
switch to use broadcast. ypbind
at first /etc/hosts and then DNS
for resolving the hosts names from
/etc/yp.conf. If ypbind
couldn't reconfigure the search order, it will
use only DNS
. If DNS
isn't available, you could only use
IP-addresses in /etc/hosts. ypbind
could only reconfigure the search
order with glibc 2.x. If the -broadcast
option is specified,
will ignore the configuration file. If the file does not exist
or if there are no valid entries, ypbind
version listens for DBUS messages from NetworkManager. If no
NetworkManager is running at startup, ypbind
will behave as usual and
assumes there is a working network connection. If NetworkManager is running on
the system, ypbind will only search and provide NIS informations, if
NetworkManager tells that a network connection is available. If NetworkManager
establishes a connection, ypbind
will reread all configuration files,
registers at the local portmapper and try to search NIS servers. If
NetworkManager drops a connection, ypbind
will unregister from
Send a broadcast to request the information
needed to bind to a specific NIS server. With this option, /etc/yp.conf will
Allow root from any remote machine to
change the binding for a domain via the ypset(8) command. By default,
no one can change the binding. This option is really insecure. If you change a
binding for a domain, all the current known servers for this domain will be
forgotten. If the new server goes down, ypbind will use the old
The same as -ypset, but only
root on the local machine is allowed to change the binding. Such
requests are only allowed from loopback.
ypbind only checks if the config file
has syntax errors and exits.
starts ypbind in debug mode.
ypbind will not put itself into background, and error messages and
debug output are written to standard error.
ypbind will not put itself into
Causes ypbind to syslog(2) any and all
changes in the server its bound to.
Lets ypbind accept answers from servers
running on an illegal port number. This should usually be avoided, but is
required by some ypserv(8) versions.
ypbind will not check if the binding is
alive. This option is for use with dialup connections to prevent ypbind
from keeping the connection unnecessarily open or causing auto-dials.
ypbind will use configfile and
ypbind will only bind to the loopback
device and is not reachable from a remote network.
The default value for ypbind to check,
if a NIS server is still reachable, is 20 seconds. With this options another
frequency in seconds can be specified.
The default value for ypbind to search
for the fastest NIS server is 900 seconds (15 minutes). With this options
another frequency in seconds can be specified.
Disables DBUS support if compiled in.
Prints the version number
binding file containing information about each
contains the process id of the currently
running ypbind master process.
was written by Thorsten Kukuk <email@example.com>.