Provided by: nis_3.17-34ubuntu3_amd64 bug


       ypbind - NIS binding process


       ypbind  [  -c  ] [ -d|-debug ] [ -broadcast ] [ -broken-server ] [ -ypset ] [ -ypsetme ] [
       -no-ping ] [ -f configfile ] [ -local-only ] [ -ping-interval ping-interval ] [ -no-dbus ]

       ypbind --version


       ypbind 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 longer, ypbind will search for a new
       NIS server. All 15 minutes ypbind 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 ypbind will send a ping to all
       servers 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 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.

       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 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 portmapper.


              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

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

              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 autodials.

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

              ypbind will only bind to the loopback device and is not  reachable  from  a  remote

       -ping-interval ping-interval
              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.

              Disables DBUS support if compiled int.

              Prints the version number


              configuration file.

              binding file containing information about each NIS domain.

              contains the process id of the currently running ypbind master process.


       syslog(3), domainname(1), yp.conf(5), ypdomainname(8), ypwhich(1), ypserv(8), ypset(8)


       ypbind-mt was written by Thorsten Kukuk <>.