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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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.\" Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
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.\" Copyright (C) 2000, 2001 Internet Software Consortium.
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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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.\" 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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.\" 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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.\" $Id: lwresd.8,v 1.13.208.2 2004/06/03 05:35:47 marka Exp $
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.\" $Id: lwresd.8,v 1.13.208.5 2005/10/13 02:33:47 marka Exp $
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.TH "LWRESD" "8" "June 30, 2000" "BIND9" ""
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.\" ** You probably do not want to edit this file directly **
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.\" It was generated using the DocBook XSL Stylesheets (version 1.69.1).
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.\" Instead of manually editing it, you probably should edit the DocBook XML
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.\" source for it and then use the DocBook XSL Stylesheets to regenerate it.
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.TH "LWRESD" "8" "June 30, 2000" "BIND9" "BIND9"
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.\" disable hyphenation
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.\" disable justification (adjust text to left margin only)
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lwresd \- lightweight resolver daemon
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\fBlwresd\fR [ \fB-C \fIconfig-file\fB\fR ] [ \fB-d \fIdebug-level\fB\fR ] [ \fB-f\fR ] [ \fB-g\fR ] [ \fB-i \fIpid-file\fB\fR ] [ \fB-n \fI#cpus\fB\fR ] [ \fB-P \fIport\fB\fR ] [ \fB-p \fIport\fB\fR ] [ \fB-s\fR ] [ \fB-t \fIdirectory\fB\fR ] [ \fB-u \fIuser\fB\fR ] [ \fB-v\fR ]
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\fBlwresd\fR [\fB\-C\ \fR\fB\fIconfig\-file\fR\fR] [\fB\-d\ \fR\fB\fIdebug\-level\fR\fR] [\fB\-f\fR] [\fB\-g\fR] [\fB\-i\ \fR\fB\fIpid\-file\fR\fR] [\fB\-n\ \fR\fB\fI#cpus\fR\fR] [\fB\-P\ \fR\fB\fIport\fR\fR] [\fB\-p\ \fR\fB\fIport\fR\fR] [\fB\-s\fR] [\fB\-t\ \fR\fB\fIdirectory\fR\fR] [\fB\-u\ \fR\fB\fIuser\fR\fR] [\fB\-v\fR]
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\fBlwresd\fR 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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\fBlwresd\fR 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 \fBlwresd\fR 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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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, \fBlwresd\fR 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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If \fI/etc/resolv.conf\fR contains any
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\fBnameserver\fR entries, \fBlwresd\fR
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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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\fBnameserver\fR entries are present, or if
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forwarding fails, \fBlwresd\fR 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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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.
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listens for resolver queries on a UDP port on the IPv4 loopback interface, 127.0.0.1. This means that
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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.
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Incoming lightweight resolver requests are decoded by the server which then resolves them using the DNS protocol. When the DNS lookup completes,
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encodes the answers in the lightweight resolver format and returns them to the client that made the request.
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\fI/etc/resolv.conf\fR
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sends recursive DNS queries to those servers. This is similar to the use of forwarders in a caching name server. If no
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entries are present, or if forwarding fails,
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resolves the queries autonomously starting at the root name servers, using a built\-in list of root server hints.
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\fB-C \fIconfig-file\fB\fR
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Use \fIconfig-file\fR as the
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configuration file instead of the default,
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\-C \fIconfig\-file\fR
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as the configuration file instead of the default,
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\fI/etc/resolv.conf\fR.
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\fB-d \fIdebug-level\fB\fR
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Set the daemon's debug level to \fIdebug-level\fR.
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Debugging traces from \fBlwresd\fR become
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more verbose as the debug level increases.
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\-d \fIdebug\-level\fR
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Set the daemon's debug level to
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\fIdebug\-level\fR. Debugging traces from
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become more verbose as the debug level increases.
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Run the server in the foreground (i.e. do not daemonize).
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Run the server in the foreground and force all logging
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Create \fI#cpus\fR worker threads
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to take advantage of multiple CPUs. If not specified,
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\fBlwresd\fR 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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Run the server in the foreground and force all logging to
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worker threads to take advantage of multiple CPUs. If not specified,
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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.
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Listen for lightweight resolver queries on port
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not specified, the default is port 921.
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Send DNS lookups to port \fIport\fR. 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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Write memory usage statistics to \fIstdout\fR
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\fIport\fR. If not specified, the default is port 921.
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Send DNS lookups to port
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\fIport\fR. 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.
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Write memory usage statistics to
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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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This option is mainly of interest to BIND 9 developers and may be removed or changed in a future release.
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\fB-t \fIdirectory\fB\fR
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\fBchroot()\fR to \fIdirectory\fR after
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processing the command line arguments, but before
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reading the configuration file.
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after processing the command line arguments, but before reading the configuration file.
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This option should be used in conjunction with the
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\fB-u\fR 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 \fBchroot()\fR 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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option, as chrooting a process running as root doesn't enhance security on most systems; the way
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is defined allows a process with root privileges to escape a chroot jail.
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\fBsetuid()\fR to \fIuser\fR 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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after completing privileged operations, such as creating sockets that listen on privileged ports.
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Report the version number and exit.
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\fB\fI/etc/resolv.conf\fB\fR
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\fI/etc/resolv.conf\fR
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The default configuration file.
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\fB\fI/var/run/lwresd.pid\fB\fR
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The default process-id file.
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\fI/var/run/lwresd.pid\fR
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The default process\-id file.
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bin/named/lwresd.8
