11-04-2015
Domain registrars & DNS servers
I have read many tutorials on bind and i understand the A,MX, CNAME records.
Internally, on a LAN we can install bind and create all these records and we can tell all PC and servers to use this bind as DNS server.that's fine.
On the Internet, when we have purchased a valid domain like somedomain.com, from a domain registrar, we are given the choice on which name servers we want the domain to be hosted.
am a bit confused here about this process.what's the name of the server that says for domain somedomain.com use these nameservers. ?
if this would not be the case, then anyone could just install bind on a public server and put whatever records they want for the domain somedomain.com
please clarify this for me.
Last edited by coolatt; 11-04-2015 at 02:25 PM..
Reason: formatting
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ypset(8) System Manager's Manual ypset(8)
NAME
ypset - point ypbind at a particular server
SYNOPSIS
/usr/sbin/ypset [-V1 | -V2] [-d domain] [-h host] server
OPTIONS
Bind server for the (old) v.1 NIS protocol. Bind server for the (current) v.2 NIS protocol.
If no version is supplied, ypset, first attempts to set the domain for the (current) v.2 protocol. If this attempt fails, ypset,
then attempts to set the domain for the (old) v.1 protocol. Set ypbind's binding on host, instead of locally. The host can be spec-
ified as a name or as an address. Use domain, instead of the default domain.
DESCRIPTION
The ypset command tells ypbind to get Network Information Service (NIS) map information for the specified domain from the ypserv process
running on server. If server is down, or isn't running ypserv, this is not discovered until an NIS client process tries to get a binding
for the domain. At this point, the binding set by ypset will be tested by ypbind. If the binding is invalid, ypbind will attempt to
rebind for the same domain.
Note
The ypbind process will refuse ypset requests unless -ypset or -ypsetme are specified when ypbind is started.
The ypset command is useful for binding a client node which is not on a broadcast net, or is on a broadcast net which isn't running an NIS
server host. It also is useful for debugging NIS client applications, for instance where an NIS map only exists at a single NIS server
host.
In cases where several hosts on the local net are supplying NIS services, it is possible for ypbind to rebind to another host even while
you attempt to find out if the ypset operation succeeded. For example, you can type: % ypset host1 % ypwhich host2
which can be confusing. This is a function of the NIS subsystem's attempt to load-balance among the available NIS servers, and occurs when
host1 does not respond to ypbind because it is not running ypserv (or is overloaded), and host2, running ypserv, gets the binding.
The server indicates the NIS server to bind to, and can be specified as a name or an address. If specified as a name, ypset will attempt
to use NIS services to resolve the name to an address. This will work only if the node has a current valid binding for the domain in ques-
tion. In most cases, server should be specified as an address.
Refer to ypfiles(4) and ypserv(8) for an overview of NIS.
SEE ALSO
Commands: ypwhich(1), ypserv(8)
Files: ypfiles(4)
ypset(8)