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ypbind(8) ypbind(8)
NAME
ypbind - NIS binding process
SYNOPSIS
ypbind [ -c ] [ -d|-debug ] [ -broadcast ] [ -broken-server ] [ -ypset ] [ -ypsetme
] [ -no-ping ] [ -f configfile ]
ypbind --version
DESCRIPTION
ypbind finds the server for NIS domains and maintains the NIS binding information.
The client (normaly 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 [domain-
name].[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 then 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 tells that he doesn’t has this domain any longer, ypbind will search
a new NIS server. All 15 minutes ypbind will check, 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
ypbind will send a ping to all server and binds to first one which answers.
Unless the option -debug is used, ypbind detaches itself from the controlling ter-
minal and puts itself into background. ypbind uses syslog(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. Valid entries
are
domain nisdomain server hostname
Use server hostname for the domain nisdomain. You could have more then one
entry of this type for a single domain.
domain nisdomain broadcast
Use broadcast on the local net for domain nisdomain.
ypserver hostname
Use server server for the local domain.
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, ypbind will
not switch to use broadcast. ypbind will try 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, ypbind will ignore the configuration
file. If the file does not exist or if there are no valid entries, ypbind exit.
This ypbind is a special version which uses pthreads. It will start 2 more
threads. The master process services RPC requests asking for binding info. The
first thread initializes the binding and checks it periodically. Upon failure, the
binding is invalidated and the process tries again to find a valid server. The sec-
ond thread will handle all the signals.
OPTIONS
-broadcast
Send a broadcast to request the information needed to bind to a specific NIS
server. With this option, /etc/yp.conf will be ignored.
-ypset 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 searchlist.
-ypsetme
The same as -ypset, but only root on the local machine is allowed to chang
the binding. Such requests are only allowd from loopback.
-c ypbind only checks if the config file has syntax errors and exits.
-debug starts ypbind in debug mode. ypbind will not put itself into background,
and error messages and debug output are written to standard error.
-broken-server
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.
-no-ping
ypbind will not check if the binding is alive. This option is for use with
dialup connections to prevent ypbind from keeping the connection unnessecar-
ily open or causing autodials.
-f configfile
ypbind will use configfile and not /etc/yp.conf
--version
Prints the version number
NOTES
Binding to multiple domains is tested and works. Load sharing between multiple
servers for a single domain is not supported. ypbind will always try to bind a
domain to a server. If there is no valid server in the list or answers to a broad-
cast, the domain is unbounded.
FILES
/etc/yp.conf
configuration file.
/var/yp/binding/[domainname].[version]
binding file containing information about each NIS domain.
/var/run/ypbind.pid
contains the process id of the currently running ypbind master process.
SEE ALSO
syslog(3), domainname(1), ypdomainname(8), ypwhich(1), ypserv(8), ypset(8)
AUTHOR
ypbind-mt was written by Thorsten Kukuk <kukuk AT suse.de>.
ypbind-mt Version 1.17.2 April 2002 ypbind(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2008-11-24 02:17 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)