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NAME    [Toc]    [Back]

       ypbind - NIS binding process

SYNOPSIS    [Toc]    [Back]

       ypbind  [ -c ] [ -d|-debug ] [ -broadcast ] [ -broken-server ] [ -ypset
       ] [ -ypsetme ] [ -no-ping ] [ -p port ][ -f configfile ]

       ypbind --version

DESCRIPTION    [Toc]    [Back]

       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/bind-
       ing and are conventionally named [domainname].[version].  The supported
       versions  are  1 and 2.	There could be serveral 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
 terminal and puts itself into  background.   ypbind  uses  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 IPaddresses
 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 second thread will handle all
       the signals.

OPTIONS    [Toc]    [Back]

	      Send a broadcast to request the information needed to bind to  a
	      specific	NIS  server.  With  this  option, /etc/yp.conf will be

       -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.

	      The  same  as  -ypset,  but  only  root  on the local machine is
	      allowed to chang the binding. Such requests are only allowd from

       -c     ypbind  only  checks  if	the  config file has syntax errors and

       -debug starts ypbind in debug mode.  ypbind will not  put  itself  into
	      background,  and	error messages and debug output are written to
	      standard error.

	      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 unnessecarily open or causing autodials.

       -f configfile
	      ypbind will use configfile and not /etc/yp.conf

       -p port
	      ypbind will bind itself to this port.  This makes it possible to
	      have a router filter packets to the NIS ports, so that access to
	      this service from hosts on the Internet can be restricted.

	      Prints the version number

NOTES    [Toc]    [Back]

       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 broadcast, the domain is unbounded.

FILES    [Toc]    [Back]

	      configuration file.

	      binding file containing information about each NIS domain.

	      contains	the  process id of the currently running ypbind master

SEE ALSO    [Toc]    [Back]

       syslog(3), domainname(1), ypwhich(1), ypserv(8), ypset(8)

AUTHOR    [Toc]    [Back]

       ypbind-mt was written by Thorsten Kukuk <kukuk@suse.de>.

ypbind-mt Version 1.8		   May 1999			     ypbind(8)
[ Back ]
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