YPXFR(8) BSD System Manager's Manual YPXFR(8)NAME
ypxfr -- get a NIS map from NIS server
SYNOPSIS
ypxfr [-cf] [-C tid prog ipadd port] [-d domain] [-h host] [-s domain] mapname
DESCRIPTION
ypxfr is the utility in NIS that transfers maps to the local host.
The options are as follows:
-c Don't send a "Clear current map" to local ypserv process. Useful if ypserv isn't running locally to avoid timeout message.
-C tid prog ipadd port
This option is only used by ypserv. This is to open communication with yppush on another host.
-d domain
Don't use default domain, use the specified domain.
-f Force map transfer, even if the master's version is older than the local copy.
-h host
Get map from host instead of the maps master host.
-s domain
Specify a source domain other than the target domain.
SEE ALSO nis(8), yppush(8), ypserv(8)AUTHORS
Mats O Jansson <moj@stacken.kth.se>
BSD April 26, 2011 BSD
Check Out this Related Man Page
YPSERV(8)YPSERV(8)NAME
ypxfr - transfer NIS database from remote server to local host
SYNOPSIS
/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 ...
DESCRIPTION
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 syslog.
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_1per-
hour. They can serve as reasonable first cuts.
Normally all updates should be propagated by yppush when /var/yp/Makefile 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.
OPTIONS
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.
-c Do not send a "clear current map" request to the ypserv process running on the local host. This flag is normally used when invoking
ypxfr by ypinit or if ypserv is not running locally at the time you are running ypxfr. Otherwise, ypxfr will complain that it
cannot talk to the local ypserv, and the transfer will fail.
-d domain
Specify a domain other than the default NIS domain.
-h source host
Get the map from host, regardless of what the map says the master is. If host is not specified, ypxfr asks the NIS service for the
name of the master, and tries to get the map from there. This option is used to insure that ypxfr only copies maps from the NIS mas-
ter 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].
mapname
One or more names of the map to transfer.
FILES
/var/yp/[domainname]/[maps]
SEE ALSO ypserv(8), yppush(8), ypinit(8), cron(8), crontab(5)AUTHOR
Thorsten Kukuk <kukuk@suse.de>
YP Server August 2001 YPSERV(8)