/contrib/bind9/bin/named/lwresd.8

  1.\" Copyright (C) 2004, 2005, 2007-2009 Internet Systems Consortium, Inc. ("ISC")
  2.\" Copyright (C) 2000, 2001 Internet Software Consortium.
  3.\" 
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 14.\" PERFORMANCE OF THIS SOFTWARE.
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 16.\" $Id$
 17.\"
 18.hy 0
 19.ad l
 20.\"     Title: lwresd
 21.\"    Author: 
 22.\" Generator: DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>
 23.\"      Date: June 30, 2000
 24.\"    Manual: BIND9
 25.\"    Source: BIND9
 26.\"
 27.TH "LWRESD" "8" "June 30, 2000" "BIND9" "BIND9"
 28.\" disable hyphenation
 29.nh
 30.\" disable justification (adjust text to left margin only)
 31.ad l
 32.SH "NAME"
 33lwresd \- lightweight resolver daemon
 34.SH "SYNOPSIS"
 35.HP 7
 36\fBlwresd\fR [\fB\-c\ \fR\fB\fIconfig\-file\fR\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\-m\ \fR\fB\fIflag\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] [\fB\-4\fR] [\fB\-6\fR]
 37.SH "DESCRIPTION"
 38.PP
 39\fBlwresd\fR
 40is 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.
 41.PP
 42\fBlwresd\fR
 43listens for resolver queries on a UDP port on the IPv4 loopback interface, 127.0.0.1. This means that
 44\fBlwresd\fR
 45can only be used by processes running on the local machine. By default, UDP port number 921 is used for lightweight resolver requests and responses.
 46.PP
 47Incoming lightweight resolver requests are decoded by the server which then resolves them using the DNS protocol. When the DNS lookup completes,
 48\fBlwresd\fR
 49encodes the answers in the lightweight resolver format and returns them to the client that made the request.
 50.PP
 51If
 52\fI/etc/resolv.conf\fR
 53contains any
 54\fBnameserver\fR
 55entries,
 56\fBlwresd\fR
 57sends recursive DNS queries to those servers. This is similar to the use of forwarders in a caching name server. If no
 58\fBnameserver\fR
 59entries are present, or if forwarding fails,
 60\fBlwresd\fR
 61resolves the queries autonomously starting at the root name servers, using a built\-in list of root server hints.
 62.SH "OPTIONS"
 63.PP
 64\-4
 65.RS 4
 66Use IPv4 only even if the host machine is capable of IPv6.
 67\fB\-4\fR
 68and
 69\fB\-6\fR
 70are mutually exclusive.
 71.RE
 72.PP
 73\-6
 74.RS 4
 75Use IPv6 only even if the host machine is capable of IPv4.
 76\fB\-4\fR
 77and
 78\fB\-6\fR
 79are mutually exclusive.
 80.RE
 81.PP
 82\-c \fIconfig\-file\fR
 83.RS 4
 84Use
 85\fIconfig\-file\fR
 86as the configuration file instead of the default,
 87\fI/etc/lwresd.conf\fR.
 88\fB\-c\fR
 89can not be used with
 90\fB\-C\fR.
 91.RE
 92.PP
 93\-C \fIconfig\-file\fR
 94.RS 4
 95Use
 96\fIconfig\-file\fR
 97as the configuration file instead of the default,
 98\fI/etc/resolv.conf\fR.
 99\fB\-C\fR
100can not be used with
101\fB\-c\fR.
102.RE
103.PP
104\-d \fIdebug\-level\fR
105.RS 4
106Set the daemon's debug level to
107\fIdebug\-level\fR. Debugging traces from
108\fBlwresd\fR
109become more verbose as the debug level increases.
110.RE
111.PP
112\-f
113.RS 4
114Run the server in the foreground (i.e. do not daemonize).
115.RE
116.PP
117\-g
118.RS 4
119Run the server in the foreground and force all logging to
120\fIstderr\fR.
121.RE
122.PP
123\-i \fIpid\-file\fR
124.RS 4
125Use
126\fIpid\-file\fR
127as the PID file instead of the default,
128\fI/var/run/lwresd/lwresd.pid\fR.
129.RE
130.PP
131\-m \fIflag\fR
132.RS 4
133Turn on memory usage debugging flags. Possible flags are
134\fIusage\fR,
135\fItrace\fR,
136\fIrecord\fR,
137\fIsize\fR, and
138\fImctx\fR. These correspond to the ISC_MEM_DEBUGXXXX flags described in
139\fI<isc/mem.h>\fR.
140.RE
141.PP
142\-n \fI#cpus\fR
143.RS 4
144Create
145\fI#cpus\fR
146worker threads to take advantage of multiple CPUs. If not specified,
147\fBlwresd\fR
148will 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.
149.RE
150.PP
151\-P \fIport\fR
152.RS 4
153Listen for lightweight resolver queries on port
154\fIport\fR. If not specified, the default is port 921.
155.RE
156.PP
157\-p \fIport\fR
158.RS 4
159Send DNS lookups to port
160\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.
161.RE
162.PP
163\-s
164.RS 4
165Write memory usage statistics to
166\fIstdout\fR
167on exit.
168.RS
169.B "Note:"
170This option is mainly of interest to BIND 9 developers and may be removed or changed in a future release.
171.RE
172.RE
173.PP
174\-t \fIdirectory\fR
175.RS 4
176Chroot to
177\fIdirectory\fR
178after processing the command line arguments, but before reading the configuration file.
179.RS
180.B "Warning:"
181This option should be used in conjunction with the
182\fB\-u\fR
183option, as chrooting a process running as root doesn't enhance security on most systems; the way
184\fBchroot(2)\fR
185is defined allows a process with root privileges to escape a chroot jail.
186.RE
187.RE
188.PP
189\-u \fIuser\fR
190.RS 4
191Setuid to
192\fIuser\fR
193after completing privileged operations, such as creating sockets that listen on privileged ports.
194.RE
195.PP
196\-v
197.RS 4
198Report the version number and exit.
199.RE
200.SH "FILES"
201.PP
202\fI/etc/resolv.conf\fR
203.RS 4
204The default configuration file.
205.RE
206.PP
207\fI/var/run/lwresd.pid\fR
208.RS 4
209The default process\-id file.
210.RE
211.SH "SEE ALSO"
212.PP
213\fBnamed\fR(8),
214\fBlwres\fR(3),
215\fBresolver\fR(5).
216.SH "AUTHOR"
217.PP
218Internet Systems Consortium
219.SH "COPYRIGHT"
220Copyright \(co 2004, 2005, 2007\-2009 Internet Systems Consortium, Inc. ("ISC")
221.br
222Copyright \(co 2000, 2001 Internet Software Consortium.
223.br