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       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

       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

       -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 change the binding. Such requests  are  only  allowed
              from loopback.

       -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 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 network.

       -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


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


       ypbind-mt was written by Thorsten Kukuk <>.