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           /usr/lib/yp/ypxfr [ -f ] [ -c ] [ -d target domain ]
                [ -h source host ] [ -s source domain ]
                [ -C taskid program-number ipaddr port ]
                [ -p yp_path ] mapname ...


           ypxfr  copies  an NIS database from one NIS server to the local host by
           using the NIS service.  ypxfr is generally  invoked  by  ypinit  or  by
           ypserv,  when  ypserv  receives a map transfer request from yppush.  It
           creates a temporary map in the directory /var/yp/domain  (this   direc-
           tory   must  already   exist;  domain is the default domainname for the
           local host), fills it by getting the map's entries and fetches the  map
           parameters  (master and order number).  If the transfer was successful,
           the old version of the map will be deleted and the temporary copy  will
           be  moved  into  its  place.  Then, ypxfr will attempt to send a "clear
           current map" request to the local ypserv.
           If  run interactively, ypxfr writes its output to stderr.  However,  if
           it is invoked without a controlling terminal, it will log the output to
           ypxfr is used primarily in environments where several NIS  servers  are
           in use.  For all maps, you have a NIS master server, which  maintains a
           canonical copy of the NIS map, and  all  the  other  servers,  the  NIS
           slaves,  copy  the  new  version  of the map from the master whenever a
           update was made.  Normally, you have one NIS master for all maps.
           In order to maintain consistency across all NIS servers, ypxfr  can  be
           run  periodically  in  a  cron job. Maps which change infrequently need
           only be updated once a day (preferably late at night when system  usage
           is  lowest),  where  those with frequent changes (such as passwd.byname
           and passwd.byuid ) should be updated perhaps once every hour.  Examples
           are  in  /usr/lib/yp: ypxfr_1perday, ypxfr_2perday, and ypxfr_1perhour.
           They can serve as reasonable first cuts.
           Normally all updates should be propagated by yppush when  /var/yp/Make-
           file  is run on the NIS master server, however it is a good practice on
           large networks where possible outages could cause NIS  slaves  to  fall
           out of sync with the master.


           The following options are supported:
           -f     Force a map transfer. Normally, ypxfr will not transfer a map if
                  it determines that the NIS master's copy is not newer  than  the
                  existing  copy  already  on  the  local host. This flag forces a
                  transfer regardless of which server's version is more recent.
                  This option is used to insure that ypxfr only copies  maps  from
                  the NIS master server.
           -s source domain
                  Specify a source domain from which to transfer a map that should
                  be the same across domains.
           -C taskid progam-number ipaddr port
                  This option is only for use by ypserv  .   When  ypserv  invokes
                  ypxfr, it specifies that ypxfr should call back a yppush process
                  at the host with IP address ipaddr, registered as program number
                  progam-number,  listening  on  port  port,  and  waiting  for  a
                  response to transaction taskid.
           -p yp_path
                  Change the directory for the maps to yp_path/[domainname]/,  the
                  default is /var/yp/[domainname].
                  One or more names of the map to transfer.




           ypserv(8), yppush(8), ypinit(8), cron(8), crontab(5)


           Thorsten Kukuk <>

    YP Server August 2001 YPSERV(8)


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