Prevent accidental push of yp maps from slave servers

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yppush

YPPUSH(8)							 Reference Manual							 YPPUSH(8)

NAME

       yppush - force propagation of changed NIS databases

SYNOPSIS

       /usr/sbin/yppush [ -d domain ] [ -t timeout ] [ --parallel # | --port port ] [ -h host ] [ -v ] mapname ...

DESCRIPTION

       yppush  copies updated NIS databases (or maps) from the master NIS server to the slave servers within a NIS domain. It is normally run only
       on the NIS master by /var/yp/Makefile after the master databases are changed.  /var/yp/Makefile does not  invoke  yppush  by  default,  the
       NOPUSH=true line must be commented out.
       yppush  first  constructs a list of NIS slave servers by reading the NIS map ypservers within the domain.  A destination host (or a list of
       hosts with multiple -h commands) can also be specified on the command line.  A "transfer map" request is sent to the  NIS  serger  at  each
       slave,  along  with the information needed by the transfer agent ypxfr(8) to callback to yppush, which may be printed the result to stderr.
       Messages are also printed when a transfer is not possible; for instance when the request message is undeliverable.

OPTIONS

       -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
	      The  timeout flag is used to 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 the list.  By default, yppush will wait 90 seconds.
	      For big maps, this is not long enough.

       --parallel #, -p #
	      yppush  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 sending the next map transfer request 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.  It is not possible to run in
	      parallel and assign a fixed port with the --port flag

       --port port
	      specify a port for yppush to  listen  on.   By default, yppush will ask portmap(8) to assign it a random port  number.   It  is  not
	      possible to assign a port with this option and run in parallel with the --parallel or -p flag

       -h host
	      The  host  flag  can  be used to transfer a map to a user-specified machine or group of machines instead of the list of servers con-
	      tained in the ypservers map. A list of hosts can be specified by using multiple instances of the -h flag.

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

SEE ALSO

       domainname(1), ypserv(8), ypxfr(8)

BUGS

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

AUTHOR

       Thorsten Kukuk <kukuk@suse.de>

YP Server							    August 2002 							 YPPUSH(8)

UNIX for Advanced & Expert Users