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YPBIND(8) NetBSD System Manager's Manual YPBIND(8)
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by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
ypbind -- create and maintain a binding to a NIS server
ypbind [-broadcast] [-insecure] [-ypset] [-ypsetme]
ypbind finds the server for a particular NIS domain and stores informa-
tion about it in a ``binding file''. This binding information includes
the IP address of the server associated with that particular domain and
which port the server is using. This information is stored in the direc-
tory /var/yp/binding in a file named with the convention
<domain>.version, where <domain> is the relevant domain. The NIS system
only supplies information on version 2.
If ypbind is started without the -broadcast option, ypbind steps through
the list of NIS servers specified in /var/yp/binding/<domain>.ypservers
and contacts each in turn attempting to bind to that server. It is
strongly recommended that these hosts are in the local hosts file, and
that hosts are looked up in local files before the NIS hosts map.
If ypbind is started with the -broadcast option, or if
/var/yp/binding/<domain>.ypservers does not exist, ypbind broadcasts to
find a process willing to serve maps for the client's domain.
Once a binding is established, ypbind maintains this binding by periodi-
cally communicating with the server to which it is bound. If the binding
is somehow lost, e.g by server reboot, ypbind marks the domain as unbound
and attempts to re-establish the binding. If a binding cannot be re-
established within 60 seconds, ypbind backs off exponentially to trying
only once per hour.
The options are as follows:
-broadcast sends a broadcast requesting a NIS server to which to bind.
-insecure do not require that the server is running on a reserved port.
This may be necessary when connecting to SunOS 3.x or ULTRIX
-ypset ypset(8) may be used from anywhere to change the server to
which a domain is bound.
-ypsetme ypset(8) may be used only from this machine to change the
server to which a domain is bound.
The -broadcast, -ypset, and -ypsetme options are inherently insecure and
should be avoided.
ypbind responds to the following signals:
HUP causes ypbind to immediately retry any unbound domains that are
currently in exponential backoff. Use this to resume immediately
after a long network outage is resolved.
/var/yp/binding/<domain>.version - binding file for <domain>.
/var/yp/binding/<domain>.ypservers - explicit list of servers to bind to
Messages are sent to syslogd(8) using the LOG_DAEMON facility.
domainname(1), ypcat(1), ypmatch(1), ypwhich(1), nis(8), yppoll(8),
This version of ypbind was originally implemented by Theo de Raadt. The
ypservers support was implemented by Luke Mewburn.
NetBSD 10.99 June 14, 2014 NetBSD 10.99