ypbind(8)
NAME
ypbind - NIS binding process
SYNOPSIS
ypbind [ -c ] [ -d|-debug ] [ -broadcast ] [ -broken-server ] [ -ypset ] [ -ypsetme ] [ -no-ping ] [ -f configfile ] [ -local-only ] [ -ping- interval ping-interval ] [ -no-dbus ] ypbind --version
DESCRIPTION
ypbind finds the server for NIS domains and maintains the NIS binding
information. The client (normally the NIS routines in the standard C
library) could get the information over RPC from ypbind or read the
binding files. The binding files resides in the directory /var/yp/binding and are conventionally named [domainname].[version]. The supported
versions are 1 and 2. There could be several such files since it is
possible for an NIS client to be bound to more than one domain.
After a binding has been established, ypbind will send YPPROC_DOMAIN
requests to the current NIS server at 20 seconds intervals. If it
doesn't get an response or the NIS server reports that he doesn't have
this domain any longer, ypbind will search for a new NIS server. All 15
minutes ypbind will check to see if the current NIS server is the
fastest. If it find a server which answers faster, it will switch to
this server. You could tell ypbind to use network broadcasts to find a
new server, what is insecure, or you could give it a list of known
secure servers. In this case ypbind will send a ping to all servers
and binds to first one which answers.
Unless the option -debug is used, ypbind detaches itself from the controlling terminal and puts itself into background. ypbind uses syslog(3) for logging errors and warnings. At startup or when receiving
signal SIGHUP, ypbind parses the file /etc/yp.conf and tries to use the
entries for its initial binding.
A broadcast entry in the configuration file will overwrite a
ypserver/server entry and a ypserver/server entry broadcast. If all
given server are down, ypbind will not switch to use broadcast. ypbind
will try at first /etc/hosts and then DNS for resolving the hosts names
from /etc/yp.conf. If ypbind couldn't reconfigure the search order, it
will use only DNS. If DNS isn't available, you could only use IPaddresses in /etc/hosts. ypbind could only reconfigure the search
order with glibc 2.x. If the -broadcast option is specified, ypbind
will ignore the configuration file. If the file does not exist or if
there are no valid entries, ypbind exit.
This ypbind version listens for DBUS messages from NetworkManager. If
no NetworkManager is running at startup, ypbind will behave as usual
and assumes there is a working network connection. If NetworkManager is
running on the system, ypbind will only search and provide NIS informations, if NetworkManager tells that a network connection is available.
If NetworkManager establishes a connection, ypbind will reread all configuration files, registers at the local portmapper and try to search
NIS servers. If NetworkManager drops a connection, ypbind will unregister from portmapper.
OPTIONS
- -broadcast
- Send a broadcast to request the information needed to bind to a specific NIS server. With this option, /etc/yp.conf will be ignored.
- -ypset Allow root from any remote machine to change the binding for a
- domain via the ypset(8) command. By default, no one can change the binding. This option is really insecure. If you change a binding for a domain, all the current known servers for this domain will be forgotten. If the new server goes down, ypbind will use the old searchlist.
- -ypsetme
- The same as -ypset, but only root on the local machine is allowed to change the binding. Such requests are only allowed from loopback.
- -c ypbind only checks if the config file has syntax errors and
- exits.
- -debug starts ypbind in debug mode. ypbind will not put itself into
- background, and error messages and debug output are written to standard error.
- -broken-server
- lets ypbind accept answers from servers running on an illegal port number. This should usually be avoided, but is required by some ypserv(8) versions.
- -no-ping
- ypbind will not check if the binding is alive. This option is for use with dialup connections to prevent ypbind from keeping the connection unnecessarily open or causing autodials.
- -f configfile
- ypbind will use configfile and not /etc/yp.conf
- -local-only
- ypbind will only bind to the loopback device and is not reachable from a remote network.
- -ping-interval ping-interval
- The default value for ypbind to check, if a NIS server is still reachable, is 20 seconds. With this options another frequency in seconds can be specified.
- -no-dbus
- Disables DBUS support if compiled int.
- --version
- Prints the version number
FILES
- /etc/yp.conf
- configuration file.
- /var/yp/binding/[domainname].[version]
- binding file containing information about each NIS domain.
- /var/run/ypbind.pid
- contains the process id of the currently running ypbind master process.
SEE ALSO
syslog(3), domainname(1), yp.conf(5), ypdomainname(8), ypwhich(1),
ypserv(8), ypset(8)
AUTHOR
- ypbind-mt was written by Thorsten Kukuk <kukuk@suse.de>.