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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:37:14 +0000 |
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| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:37:14 +0000 |
| commit | ea648e70a989cca190cd7403fe892fd2dcc290b4 (patch) | |
| tree | e2b6b1c647da68b0d4d66082835e256eb30970e8 /bin/named/lwresd.html | |
| parent | Initial commit. (diff) | |
| download | bind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.tar.xz bind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.zip | |
Adding upstream version 1:9.11.5.P4+dfsg.upstream/1%9.11.5.P4+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'bin/named/lwresd.html')
| -rw-r--r-- | bin/named/lwresd.html | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/bin/named/lwresd.html b/bin/named/lwresd.html new file mode 100644 index 0000000..128e89f --- /dev/null +++ b/bin/named/lwresd.html @@ -0,0 +1,295 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<!-- + - Copyright (C) 2000, 2001, 2004, 2005, 2007-2009, 2014-2019 Internet Systems Consortium, Inc. ("ISC") + - + - This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. +--> +<html lang="en"> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>lwresd</title> +<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry"> +<a name="man.lwresd"></a><div class="titlepage"></div> + + + + + + <div class="refnamediv"> +<h2>Name</h2> +<p> + <span class="application">lwresd</span> + — lightweight resolver daemon + </p> +</div> + + + + <div class="refsynopsisdiv"> +<h2>Synopsis</h2> + <div class="cmdsynopsis"><p> + <code class="command">lwresd</code> + [<code class="option">-c <em class="replaceable"><code>config-file</code></em></code>] + [<code class="option">-C <em class="replaceable"><code>config-file</code></em></code>] + [<code class="option">-d <em class="replaceable"><code>debug-level</code></em></code>] + [<code class="option">-f</code>] + [<code class="option">-g</code>] + [<code class="option">-i <em class="replaceable"><code>pid-file</code></em></code>] + [<code class="option">-m <em class="replaceable"><code>flag</code></em></code>] + [<code class="option">-n <em class="replaceable"><code>#cpus</code></em></code>] + [<code class="option">-P <em class="replaceable"><code>port</code></em></code>] + [<code class="option">-p <em class="replaceable"><code>port</code></em></code>] + [<code class="option">-s</code>] + [<code class="option">-t <em class="replaceable"><code>directory</code></em></code>] + [<code class="option">-u <em class="replaceable"><code>user</code></em></code>] + [<code class="option">-v</code>] + [ + [<code class="option">-4</code>] + | [<code class="option">-6</code>] + ] + </p></div> + </div> + + <div class="refsection"> +<a name="id-1.7"></a><h2>DESCRIPTION</h2> + + + <p><span class="command"><strong>lwresd</strong></span> + is the daemon providing name lookup + services to clients that use the BIND 9 lightweight resolver + library. It is essentially a stripped-down, caching-only name + server that answers queries using the BIND 9 lightweight + resolver protocol rather than the DNS protocol. + </p> + + <p><span class="command"><strong>lwresd</strong></span> + listens for resolver queries on a + UDP port on the IPv4 loopback interface, 127.0.0.1. This + means that <span class="command"><strong>lwresd</strong></span> can only be used by + processes running on the local machine. By default, UDP port + number 921 is used for lightweight resolver requests and + responses. + </p> + <p> + Incoming lightweight resolver requests are decoded by the + server which then resolves them using the DNS protocol. When + the DNS lookup completes, <span class="command"><strong>lwresd</strong></span> encodes + the answers in the lightweight resolver format and returns + them to the client that made the request. + </p> + <p> + If <code class="filename">/etc/resolv.conf</code> contains any + <code class="option">nameserver</code> entries, <span class="command"><strong>lwresd</strong></span> + sends recursive DNS queries to those servers. This is similar + to the use of forwarders in a caching name server. If no + <code class="option">nameserver</code> entries are present, or if + forwarding fails, <span class="command"><strong>lwresd</strong></span> resolves the + queries autonomously starting at the root name servers, using + a built-in list of root server hints. + </p> + </div> + + <div class="refsection"> +<a name="id-1.8"></a><h2>OPTIONS</h2> + + + <div class="variablelist"><dl class="variablelist"> +<dt><span class="term">-4</span></dt> +<dd> + <p> + Use IPv4 only even if the host machine is capable of IPv6. + <code class="option">-4</code> and <code class="option">-6</code> are mutually + exclusive. + </p> + </dd> +<dt><span class="term">-6</span></dt> +<dd> + <p> + Use IPv6 only even if the host machine is capable of IPv4. + <code class="option">-4</code> and <code class="option">-6</code> are mutually + exclusive. + </p> + </dd> +<dt><span class="term">-c <em class="replaceable"><code>config-file</code></em></span></dt> +<dd> + <p> + Use <em class="replaceable"><code>config-file</code></em> as the + configuration file instead of the default, + <code class="filename">/etc/lwresd.conf</code>. + + <code class="option">-c</code> can not be used with <code class="option">-C</code>. + </p> + </dd> +<dt><span class="term">-C <em class="replaceable"><code>config-file</code></em></span></dt> +<dd> + <p> + Use <em class="replaceable"><code>config-file</code></em> as the + configuration file instead of the default, + <code class="filename">/etc/resolv.conf</code>. + <code class="option">-C</code> can not be used with <code class="option">-c</code>. + </p> + </dd> +<dt><span class="term">-d <em class="replaceable"><code>debug-level</code></em></span></dt> +<dd> + <p> + Set the daemon's debug level to <em class="replaceable"><code>debug-level</code></em>. + Debugging traces from <span class="command"><strong>lwresd</strong></span> become + more verbose as the debug level increases. + </p> + </dd> +<dt><span class="term">-f</span></dt> +<dd> + <p> + Run the server in the foreground (i.e. do not daemonize). + </p> + </dd> +<dt><span class="term">-g</span></dt> +<dd> + <p> + Run the server in the foreground and force all logging + to <code class="filename">stderr</code>. + </p> + </dd> +<dt><span class="term">-i <em class="replaceable"><code>pid-file</code></em></span></dt> +<dd> + <p> + Use <em class="replaceable"><code>pid-file</code></em> as the + PID file instead of the default, + <code class="filename">/var/run/lwresd/lwresd.pid</code>. + </p> + </dd> +<dt><span class="term">-m <em class="replaceable"><code>flag</code></em></span></dt> +<dd> + <p> + Turn on memory usage debugging flags. Possible flags are + <em class="replaceable"><code>usage</code></em>, + <em class="replaceable"><code>trace</code></em>, + <em class="replaceable"><code>record</code></em>, + <em class="replaceable"><code>size</code></em>, and + <em class="replaceable"><code>mctx</code></em>. + These correspond to the ISC_MEM_DEBUGXXXX flags described in + <code class="filename"><isc/mem.h></code>. + </p> + </dd> +<dt><span class="term">-n <em class="replaceable"><code>#cpus</code></em></span></dt> +<dd> + <p> + Create <em class="replaceable"><code>#cpus</code></em> worker threads + to take advantage of multiple CPUs. If not specified, + <span class="command"><strong>lwresd</strong></span> will try to determine the + number of CPUs present and create one thread per CPU. + If it is unable to determine the number of CPUs, a + single worker thread will be created. + </p> + </dd> +<dt><span class="term">-P <em class="replaceable"><code>port</code></em></span></dt> +<dd> + <p> + Listen for lightweight resolver queries on port + <em class="replaceable"><code>port</code></em>. If + not specified, the default is port 921. + </p> + </dd> +<dt><span class="term">-p <em class="replaceable"><code>port</code></em></span></dt> +<dd> + <p> + Send DNS lookups to port <em class="replaceable"><code>port</code></em>. If not + specified, the default is port 53. This provides a + way of testing the lightweight resolver daemon with a + name server that listens for queries on a non-standard + port number. + </p> + </dd> +<dt><span class="term">-s</span></dt> +<dd> + <p> + Write memory usage statistics to <code class="filename">stdout</code> + on exit. + </p> + <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> +<h3 class="title">Note</h3> + <p> + This option is mainly of interest to BIND 9 developers + and may be removed or changed in a future release. + </p> + </div> + </dd> +<dt><span class="term">-t <em class="replaceable"><code>directory</code></em></span></dt> +<dd> + <p>Chroot + to <em class="replaceable"><code>directory</code></em> after + processing the command line arguments, but before + reading the configuration file. + </p> + <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"> +<h3 class="title">Warning</h3> + <p> + This option should be used in conjunction with the + <code class="option">-u</code> option, as chrooting a process + running as root doesn't enhance security on most + systems; the way <code class="function">chroot(2)</code> is + defined allows a process with root privileges to + escape a chroot jail. + </p> + </div> + </dd> +<dt><span class="term">-u <em class="replaceable"><code>user</code></em></span></dt> +<dd> + <p>Setuid + to <em class="replaceable"><code>user</code></em> after completing + privileged operations, such as creating sockets that + listen on privileged ports. + </p> + </dd> +<dt><span class="term">-v</span></dt> +<dd> + <p> + Report the version number and exit. + </p> + </dd> +</dl></div> + + </div> + + <div class="refsection"> +<a name="id-1.9"></a><h2>FILES</h2> + + + <div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="filename">/etc/resolv.conf</code></span></dt> +<dd> + <p> + The default configuration file. + </p> + </dd> +<dt><span class="term"><code class="filename">/var/run/lwresd.pid</code></span></dt> +<dd> + <p> + The default process-id file. + </p> + </dd> +</dl></div> + + </div> + + <div class="refsection"> +<a name="id-1.10"></a><h2>SEE ALSO</h2> + + <p><span class="citerefentry"> + <span class="refentrytitle">named</span>(8) + </span>, + <span class="citerefentry"> + <span class="refentrytitle">lwres</span>(3) + </span>, + <span class="citerefentry"> + <span class="refentrytitle">resolver</span>(5) + </span>. + </p> + </div> + +</div></body> +</html> |