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- <H1>Network Information Services</H1>
- <P>
- Network Information Services (NIS) is a popular name service that
- centralizes network information in a database so that the information
- can be easily administered and automatically propagated to other
- servers in the network. The database contains name and address
- information as well as information about network services. The
- information originates in files that the NIS administrator maintains;
- these files are converted into a series of maps that compose the database.
- </P>
- <P>
- Maps are stored in a hierarchy of NIS servers that respond to
- information requests from NIS clients. The hierarchy consists of a
- <EM>master server</EM>, which contains authoritative information, and
- one or more <VAR>slave servers</VAR>, which contain copies of the
- database. At least one server must exist on each network in the
- organization to answer client queries. NIS master and slave servers
- run the NIS server daemon, <VAR>ypserv</VAR>.
- </P>
- <P>
- All systems that share a common database are in the same NIS domain. To
- avoid confusion, NIS domains should correspond to DNS domains if you use
- both name services.
- </P>
- <P>
- <STRONG>Note:</STRONG> Because NIS is an insecure name service, it
- should not be used on firewall systems or on any system containing
- confidential data.
- </P>
- <P>To configure NIS, use these forms: </P>
- <UL>
- <LI><A HREF="index.nis1.shtml" TARGET="left">NIS Client</A>
- <LI><A HREF="index.nis2.shtml" TARGET="left">NIS Master</A>
- <LI><A HREF="index.nis3.shtml" TARGET="left">NIS Slave</A>
- </UL>
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