301 lines
8.7 KiB
Plaintext
301 lines
8.7 KiB
Plaintext
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
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<!--
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- Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
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- Copyright (C) 2000, 2001 Internet Software Consortium.
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-
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- Permission to use, copy, modify, and distribute this software for any
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- purpose with or without fee is hereby granted, provided that the above
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- copyright notice and this permission notice appear in all copies.
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-
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- THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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- AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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- OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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- PERFORMANCE OF THIS SOFTWARE.
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-->
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<!-- Id: lwresd.docbook,v 1.6.208.2 2004/06/03 02:24:57 marka Exp -->
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<refentry>
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<refentryinfo>
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<date>June 30, 2000</date>
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</refentryinfo>
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<refmeta>
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<refentrytitle><application>lwresd</application></refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo>BIND9</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname><application>lwresd</application></refname>
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<refpurpose>lightweight resolver daemon</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>lwresd</command>
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<arg><option>-C <replaceable class="parameter">config-file</replaceable></option></arg>
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<arg><option>-d <replaceable class="parameter">debug-level</replaceable></option></arg>
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<arg><option>-f</option></arg>
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<arg><option>-g</option></arg>
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<arg><option>-i <replaceable class="parameter">pid-file</replaceable></option></arg>
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<arg><option>-n <replaceable class="parameter">#cpus</replaceable></option></arg>
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<arg><option>-P <replaceable class="parameter">port</replaceable></option></arg>
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<arg><option>-p <replaceable class="parameter">port</replaceable></option></arg>
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<arg><option>-s</option></arg>
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<arg><option>-t <replaceable class="parameter">directory</replaceable></option></arg>
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<arg><option>-u <replaceable class="parameter">user</replaceable></option></arg>
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<arg><option>-v</option></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>DESCRIPTION</title>
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<para>
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<command>lwresd</command> is the daemon providing name lookup
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services to clients that use the BIND 9 lightweight resolver
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library. It is essentially a stripped-down, caching-only name
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server that answers queries using the BIND 9 lightweight
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resolver protocol rather than the DNS protocol.
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</para>
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<para>
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<command>lwresd</command> listens for resolver queries on a
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UDP port on the IPv4 loopback interface, 127.0.0.1. This
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means that <command>lwresd</command> can only be used by
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processes running on the local machine. By default UDP port
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number 921 is used for lightweight resolver requests and
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responses.
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</para>
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<para>
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Incoming lightweight resolver requests are decoded by the
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server which then resolves them using the DNS protocol. When
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the DNS lookup completes, <command>lwresd</command> encodes
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the answers in the lightweight resolver format and returns
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them to the client that made the request.
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</para>
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<para>
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If <filename>/etc/resolv.conf</filename> contains any
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<option>nameserver</option> entries, <command>lwresd</command>
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sends recursive DNS queries to those servers. This is similar
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to the use of forwarders in a caching name server. If no
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<option>nameserver</option> entries are present, or if
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forwarding fails, <command>lwresd</command> resolves the
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queries autonomously starting at the root name servers, using
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a built-in list of root server hints.
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</para>
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</refsect1>
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<refsect1>
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<title>OPTIONS</title>
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<variablelist>
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<varlistentry>
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<term>-C <replaceable class="parameter">config-file</replaceable></term>
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<listitem>
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<para>
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Use <replaceable
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class="parameter">config-file</replaceable> as the
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configuration file instead of the default,
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<filename>/etc/resolv.conf</filename>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-d <replaceable class="parameter">debug-level</replaceable></term>
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<listitem>
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<para>
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Set the daemon's debug level to <replaceable
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class="parameter">debug-level</replaceable>.
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Debugging traces from <command>lwresd</command> become
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more verbose as the debug level increases.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-f</term>
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<listitem>
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<para>
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Run the server in the foreground (i.e. do not daemonize).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-g</term>
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<listitem>
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<para>
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Run the server in the foreground and force all logging
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to <filename>stderr</filename>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-n <replaceable class="parameter">#cpus</replaceable></term>
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<listitem>
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<para>
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Create <replaceable
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class="parameter">#cpus</replaceable> worker threads
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to take advantage of multiple CPUs. If not specified,
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<command>lwresd</command> will try to determine the
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number of CPUs present and create one thread per CPU.
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If it is unable to determine the number of CPUs, a
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single worker thread will be created.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-P <replaceable class="parameter">port</replaceable></term>
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<listitem>
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<para>
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Listen for lightweight resolver queries on port
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<replaceable class="parameter">port</replaceable>. If
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not specified, the default is port 921.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-p <replaceable class="parameter">port</replaceable></term>
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<listitem>
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<para>
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Send DNS lookups to port <replaceable
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class="parameter">port</replaceable>. If not
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specified, the default is port 53. This provides a
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way of testing the lightweight resolver daemon with a
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name server that listens for queries on a non-standard
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port number.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-s</term>
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<listitem>
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<para>
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Write memory usage statistics to <filename>stdout</filename>
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on exit.
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</para>
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<note>
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<para>
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This option is mainly of interest to BIND 9 developers
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and may be removed or changed in a future release.
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</para>
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</note>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-t <replaceable class="parameter">directory</replaceable></term>
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<listitem>
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<para>
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<function>chroot()</function> to <replaceable
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class="parameter">directory</replaceable> after
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processing the command line arguments, but before
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reading the configuration file.
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</para>
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<warning>
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<para>
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This option should be used in conjunction with the
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<option>-u</option> option, as chrooting a process
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running as root doesn't enhance security on most
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systems; the way <function>chroot()</function> is
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defined allows a process with root privileges to
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escape a chroot jail.
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</para>
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</warning>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-u <replaceable class="parameter">user</replaceable></term>
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<listitem>
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<para>
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<function>setuid()</function> to <replaceable
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class="parameter">user</replaceable> after completing
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privileged operations, such as creating sockets that
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listen on privileged ports.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>-v</term>
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<listitem>
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<para>
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Report the version number and exit.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/resolv.conf</filename></term>
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<listitem>
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<para>
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The default configuration file.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/var/run/lwresd.pid</filename></term>
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<listitem>
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<para>
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The default process-id file.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>SEE ALSO</title>
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<para>
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<citerefentry>
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<refentrytitle>named</refentrytitle>
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<manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>lwres</refentrytitle>
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<manvolnum>3</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>resolver</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>AUTHOR</title>
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<para>
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<corpauthor>Internet Systems Consortium</corpauthor>
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</para>
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</refsect1>
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</refentry>
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<!--
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- Local variables:
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- mode: sgml
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- End:
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-->
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