122 lines
4.1 KiB
HTML
122 lines
4.1 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>resolver(5)</TITLE>
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</HEAD>
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<BODY>
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<H1>resolver(5)</H1>
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<HR>
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<PRE>
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</PRE>
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<H2>NAME</H2><PRE>
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resolver - resolver configuration file
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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/etc/resolv.conf
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <EM>resolver</EM> is a set of routines in the C library (<STRONG><A HREF="../man3/resolv.3.html">resolv(3)</A></STRONG>) that
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provide access to the Internet Domain Name System. The resolver
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configuration file contains information that is read by the resolver
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routines the first time they are invoked by a process. The file is
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designed to be human readable and contains a list of keywords with values
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that provide various types of resolver information.
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On a normally configured system this file should not be necessary. The
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only name server to be queried will be on the local machine, the domain
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name is determined from the host name, and the domain search path is
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constructed from the domain name.
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The different configuration options are:
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<STRONG>nameserver</STRONG>
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Internet address (in dot notation) of a name server that the
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resolver should query. Up to MAXNS (currently 3) name servers may
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be listed, one per keyword. If there are multiple servers, the
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resolver library queries them in the order listed. If no <STRONG>nameserver</STRONG>
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entries are present, the default is to use the name server on the
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local machine. (The algorithm used is to try a name server, and if
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the query times out, try the next, until out of name servers, then
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repeat trying all the name servers until a maximum number of retries
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are made).
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<STRONG>domain</STRONG>
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Local domain name. Most queries for names within this domain can
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use short names relative to the local domain. If no <STRONG>domain</STRONG> entry is
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present, the domain is determined from the local host name returned
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by <STRONG><A HREF="../man2/gethostname.2.html">gethostname(2)</A></STRONG>; the domain part is taken to be everything after
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the first `.'. Finally, if the host name does not contain a domain
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part, the root domain is assumed.
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<STRONG>search</STRONG>
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Search list for host-name lookup. The search list is normally
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determined from the local domain name; by default, it begins with
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the local domain name, then successive parent domains that have at
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least two components in their names. This may be changed by listing
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the desired domain search path following the <EM>search</EM> keyword with
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spaces or tabs separating the names. Most resolver queries will be
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attempted using each component of the search path in turn until a
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match is found. Note that this process may be slow and will
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generate a lot of network traffic if the servers for the listed
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domains are not local, and that queries will time out if no server
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is available for one of the domains.
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The search list is currently limited to six domains with a total of
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256 characters.
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The <EM>domain</EM> and <EM>search</EM> keywords are mutually exclusive. If more than one
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instance of these keywords is present, the last instance will override.
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The keyword and value must appear on a single line, and the keyword (e.g.
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<STRONG>nameserver</STRONG>) must start the line. The value follows the keyword,
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separated by white space.
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</PRE>
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<H2>FILES</H2><PRE>
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/<EM>etc</EM>/<EM>resolv</EM>.<EM>conf</EM>
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="../man3/gethostbyname.3N.html">gethostbyname(3N)</A></STRONG>, <STRONG><A HREF="../man3/resolver.3.html">resolver(3)</A></STRONG>, <STRONG><A HREF="../man7/hostname.7.html">hostname(7)</A></STRONG>, <STRONG><A HREF="../man8/named.8.html">named(8)</A></STRONG>
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Name Server Operations Guide for BIND
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</PRE>
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</BODY>
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</HTML>
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