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yppush(8)

NAME

     yppush -- force propagation of updated NIS databases

SYNOPSIS

     yppush [-d domain] [-t timeout] [-j #parallel jobs] [-h host] [-p path]
	    [-v] mapname

DESCRIPTION

     The yppush utility distributes updated NIS databases (or maps) from an
     NIS master server to NIS slave servers within an NIS domain.  It is nor-
     mally only run on the NIS master by /var/yp/Makefile whenever any of the
     NIS maps are updated.  Note that /var/yp/Makefile does not invoke yppush
     by default: the ``NOPUSH=True'' entry in the Makefile must first be com-
     mented out (the default FreeBSD configuration assumes a small network
     with only a single NIS server; in such a configuration, yppush is not
     needed).

     By default, yppush determines the names of the slave servers for a domain
     by searching the ypservers map.  A destination host (or a list of hosts)
     can also be manually specified on the command line.  Once it has a com-
     plete list of slave servers, it sends a 'map transfer' request to each
     slave, which in turn reads a copy of the map from the master NIS server
     using ypxfr(8).  Included within each request is the name of the map to
     be copied and some special information required by ypxfr(8) to success-
     fully 'callback' to yppush and carry out the transfer.  Any error mes-
     sages yppush receives from ypxfr(8) via callback will be printed to
     stderr.

     The following options are available:

     -d domain
	     Specify a particular domain.  The NIS domain of the local host
	     system is used by default.  If the local host's domain name is
	     not set, the domain name must be specified with this flag.

     -t timeout
	     Specify a timeout value in seconds.  This timeout controls how
	     long yppush will wait for a response from a slave server before
	     sending a map transfer request to the next slave server in its
	     list.

     -j #parallel jobs
	     The yppush utility normally performs transfers serially, meaning
	     that it will send a map transfer request to one slave server and
	     then wait for it to respond before moving on to the next slave
	     server.  In environments with many slaves, it is more efficient
	     to initiate several map transfers at once so that the transfers
	     can take place in parallel.  The -j flag is used to specify the
	     desired number of parallel jobs: yppush will initiate the speci-
	     fied number of transfers immediately and listen for responses.
	     If the number of specified parallel jobs is less than the number
	     of slave servers, yppush will initiate only the number of speci-
	     fied jobs and then wait for some of them to finish before start-
	     ing any more.

	     Note that yppush handles callbacks asynchronously, which means
	     that it will collect and display the callback information

     -p path
	     By default, yppush expects all the local NIS maps to be stored
	     under /var/yp.  The -p flag can be used to specify an alternate
	     path in the event that the system administrator decides to store
	     the NIS maps somewhere else.

     -v      Verbose mode: it causes yppush to print debugging messages as it
	     runs.  Specifying this flag twice makes yppush even more verbose.

FILES

     /var/yp/[domainname]/ypservers    the NIS ypservers map containing the
				       names of all servers in a particular
				       NIS domain

SEE ALSO

     yp(8), ypserv(8), ypxfr(8)

BUGS

     The mechanism for transferring NIS maps in NIS v1 is different than that
     in NIS version 2.	This version of yppush has support for transferring
     maps to NIS v2 systems only.

AUTHORS

     Bill Paul <wpaul@ctr.columbia.edu>

FreeBSD 5.4		       February 5, 1995 		   FreeBSD 5.4

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