create and maintain a binding to a YP
ypbind finds the server for a particular
YP 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
DOMAINNAME.version. (The YP system only supplies
information on version 2.)
ypbind starts the primary domain (or
gets the first request for a new domain), it checks if a file for the domain
in question exists in the directory /etc/yp/ (i.e.,
/etc/yp/DOMAINNAME). If such a file exists, it will
list the hosts which
ypbind should restrict its
server search to. Otherwise,
ypbind assumes it will
need to use broadcasts to find a valid server. Using either of these
ypbind will search for a server 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. When the binding
is once again successful,
ypbind marks the domain as
bound and resumes its periodic check.
The options are as follows:
- Permit binding to a ypserv(8) on a non-reserved port. This is needed if receiving maps from SunOS 3.x or Ultrix.
- ypset(8) may be used to change the server to which a domain is bound.
- ypset(8) may be used only from this machine to change the server to which a domain is bound.
-ypsetme options are dangerous and should be
avoided. For greatest security, the use of a server list in
/etc/yp/DOMAINNAME is recommended. The file should
contain a list of valid YP server hostnames, with one hostname per line. The
comment character is #.
/var/yp/binding/DOMAINNAME.version - binding file for domainname /etc/yp/DOMAINNAME - server list for this particular domain
domainname(1), ypcat(1), ypmatch(1), ypwhich(1), yp(8), yppoll(8), ypserv(8), ypset(8)
ypbind is running, the following
pages should be reviewed in order to see how to enable YP support for each
of the following maps: ethers(5), group(5), hosts(5), passwd(5),
Theo de Raadt