auto-import changelog data from man-pages-1.67-3.src.rpm
Wed Aug 25 2004 Adrian Havill <havill@redhat.com> 1.67-3 - make resolver clearer and less bind-focused (#126696)
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Summary: Man (manual) pages from the Linux Documentation Project.
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Name: man-pages
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Version: 1.67
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Release: 2
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Release: 3
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License: distributable
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Group: Documentation
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Source0: http://www.kernel.org/pub/linux/docs/manpages/man-pages-%{version}.tar.gz
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@ -143,6 +143,9 @@ rm -rf $RPM_BUILD_ROOT
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%{_mandir}/en/man*/*
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%changelog
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* Wed Aug 25 2004 Adrian Havill <havill@redhat.com> 1.67-3
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- make resolver clearer and less bind-focused (#126696)
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* Fri Aug 20 2004 Adrian Havill <havill@redhat.com> 1.67-2
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- updated to latest
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- getrpcent/setrpcent typo (#73836)
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121
resolver.5
121
resolver.5
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.\" @(#)resolver.5 5.9 (Berkeley) 12/14/89
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.\" $Id: resolver.5,v 8.6 1999/05/21 00:01:02 vixie Exp $
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.\"
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.Dd November 11, 1993
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.\" Revised by Mike MacCana
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.\"
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.Dd June 23, 2004
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.Dt RESOLVER 5
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.Os BSD 4
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.Sh NAME
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.Nm resolver
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.Nd resolver configuration file
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.Nd DNS client
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.Sh SYNOPSIS
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.Pa /etc/resolv.conf
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.Sh DESCRIPTION
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The
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.Nm resolver
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is a set of routines in the C library
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.Pq Xr resolve 3
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that provide access to the Internet Domain Name System.
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The
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.Nm resolver
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configuration file contains information that is read
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by the
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.Nm resolver
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routines the first time they are invoked by a process.
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The file is designed to be human readable and contains a list of
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keywords with values that provide various types of
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.Nm resolver
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information.
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is the DNS client used on most Linux and BSD systems. It comes with glibc.
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Its configuration file
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.Pa /etc/resolv.conf
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(note the spelling) determines the DNS servers to use, and various other options - see below.
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.Pp
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On a normally configured system, this file should not be necessary.
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The only name server to be queried will be on the local machine,
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the domain name is determined from the host name,
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and the domain search path is constructed from the domain name.
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Almost all machines have a DNS server set up in this file - if it
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doesn't exist, the system will assume there's a DNS server running on the local
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machine, and work out the search path from the machines domain name.
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.Pp
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The different configuration directives are:
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.Bl -tag -width "nameser"
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The config file is read the first time the DNS client is invoked by a process.
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.Pp
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The different configuration options are:
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.Bl -tag -width "nameserver"
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.It Li nameserver
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Internet address (in dot notation) of a name server that the
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IP address of a DNS server to use. Multiple name servers may be listed, each on their own line. The
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.Nm resolver
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should query. Up to
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will use them in order listed - if the first server times out answering the query, the next server will be tried, and so on. If the
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.Li resolver
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runs out out of name servers, the first server will be queried again, until a maximum number of retries are made.
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.Pp
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The maximum number of DNS servers to use is set by
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.Dv MAXNS
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(see
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.Pa <resolv.h> )
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name servers may be listed, one per keyword.
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If there are multiple servers, the
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.Nm resolver
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library queries them in the order listed.
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If no
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.Li nameserver
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entries are present, the default is to use the name server on the local machine.
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(The algorithm used is to try a name server, and if the query times out,
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try the next, until out of name servers,
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then repeat trying all the name servers
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until a maximum number of retries are made).
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.It Li domain
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Local domain name.
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Most queries for names within this domain can use short names
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relative to the local domain.
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If no
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.Li domain
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entry is present, the domain is determined from the local host name returned by
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.Xr gethostname 2 ;
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the domain part is taken to be everything after the first
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.Sq \&. .
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Finally, if the host name does not contain a domain part, the root
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domain is assumed.
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.Pa <resolv.h>
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)
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.It Li search
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Search list for host-name lookup.
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The search list is normally determined from the local domain name;
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by default, it contains only the local domain name.
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This may be changed by listing the desired domain search path
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following the
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.Li search
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keyword with spaces or tabs separating the names.
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Most
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.Nm resolver
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queries will be attempted using each component
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of the search path in turn until a match is found.
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Note that this process may be slow and will generate a lot of network
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traffic if the servers for the listed domains are not local,
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and that queries will time out if no server is available
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for one of the domains.
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Domain(s) to use for DNS lookups when no domain is specified. List each domain
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following the
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.Li search
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keyword with spaces or tabs between them. Each possible domain will be checked in order until a match is found. Note that this process may be slow (queries will time out if no server is available for a domain) and will generate a lot of network traffic if the servers for the listed domains aren't local.
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.Pp
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The search list is currently limited to six domains
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with a total of 256 characters.
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The search list is currently limited to six domains with a total of 256 characters.
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If
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.Li search
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isn't specified, the search list will be determined from the local domain name (whatever comes after the first dot). If the host name doesn't contain a domain, the root domain is used.
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.Pp
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By default, it
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.Li search
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contains only the local domain name.
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.It Li domain
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Local domain name. You can use this instead of the
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.Li search
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option to specify a single domain to check if a hostname isn't specified. Most people just use
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.Li search
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instead (that option lets you use multiple servers,
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.Li domain
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doesn't). You can't use
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.Li domain
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and
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.Li search
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at the same time - they're mutually exclusive.
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.Pp
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If
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.Li domain
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isn't specified, the domain will be determined from the local domain name (whatever comes after the first dot). If the host name doesn't contain a domain, the root domain is used.
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.It Li sortlist
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Allows addresses returned by gethostbyname to be sorted.
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A
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Sorts addresses returned by the
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.Li gethostbyname
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system call.
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A
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.Li sortlist
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is specified by IP address netmask pairs. The netmask is
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optional and defaults to the natural netmask of the net. The IP address
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