YPBIND(8) | System Manager's Manual | YPBIND(8) |
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 information 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 directory
/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 periodically 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
-insecure
-ypset
-ypsetme
The -broadcast
,
-ypset
, and -ypsetme
options
are inherently insecure and should be avoided.
ypbind
responds to the following
signals:
HUP
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 for <domain>.
Messages are sent to
syslogd(8) using the
LOG_DAEMON
facility.
domainname(1), ypcat(1), ypmatch(1), ypwhich(1), nis(8), yppoll(8), ypset(8)
This version of ypbind
was originally
implemented by Theo de Raadt. The ypservers support
was implemented by Luke Mewburn.
June 14, 2014 | NetBSD 10.99 |