NAME
ypbind —
create and maintain a binding to a YP
server
SYNOPSIS
ypbind |
[-insecure] [-ypset]
[-ypsetme] |
DESCRIPTION
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.)
When 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
techniques, 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:
-insecure- Permit binding to a ypserv(8) on a non-reserved port. This is needed if receiving maps from SunOS 3.x or Ultrix.
-ypset- ypset(8) may be used 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 -ypset and
-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 #.
FILES
/var/yp/binding/DOMAINNAME.version - binding file for domainname /etc/yp/DOMAINNAME - server list for this particular domain
SEE ALSO
domainname(1), ypcat(1), ypmatch(1), ypwhich(1), yp(8), yppoll(8), ypserv(8), ypset(8)
Once 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),
resolv.conf(5)
AUTHORS
Theo de Raadt