yppush - force propagation of changed NIS databases
/usr/sbin/yppush [-d domain]
[-t timeout] [--parallel # |
--port port] [-h host] [-v]
mapname...
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
server 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.
To specify a port number or use any other yppush options
you can edit /var/yp/Makefile directly.
-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
contained 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.
The mechanism for transferring NIS maps in NIS v1 is different
that that in NIS version 2. This version of yppush has support for
transferring maps to NIS v2 systems only.
Thorsten Kukuk <kukuk@linux-nis.org>