-
Notifications
You must be signed in to change notification settings - Fork 132
/
Bv9ARM.ch03.html
773 lines (733 loc) · 30.9 KB
/
Bv9ARM.ch03.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!--
- Copyright (C) 2004-2018 Internet Systems Consortium, Inc. ("ISC")
- Copyright (C) 2000-2003 Internet Software Consortium.
-
- Permission to use, copy, modify, and/or distribute this software for any
- purpose with or without fee is hereby granted, provided that the above
- copyright notice and this permission notice appear in all copies.
-
- THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- PERFORMANCE OF THIS SOFTWARE.
-->
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Chapter 3. Name Server Configuration</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
<link rel="up" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
<link rel="prev" href="Bv9ARM.ch02.html" title="Chapter 2. BIND Resource Requirements">
<link rel="next" href="Bv9ARM.ch04.html" title="Chapter 4. Advanced DNS Features">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr><th colspan="3" align="center">Chapter 3. Name Server Configuration</th></tr>
<tr>
<td width="20%" align="left">
<a accesskey="p" href="Bv9ARM.ch02.html">Prev</a> </td>
<th width="60%" align="center"> </th>
<td width="20%" align="right"> <a accesskey="n" href="Bv9ARM.ch04.html">Next</a>
</td>
</tr>
</table>
<hr>
</div>
<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="Bv9ARM.ch03"></a>Chapter 3. Name Server Configuration</h1></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="section"><a href="Bv9ARM.ch03.html#sample_configuration">Sample Configurations</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="Bv9ARM.ch03.html#cache_only_sample">A Caching-only Name Server</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch03.html#auth_only_sample">An Authoritative-only Name Server</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="Bv9ARM.ch03.html#load_balancing">Load Balancing</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch03.html#ns_operations">Name Server Operations</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="Bv9ARM.ch03.html#tools">Tools for Use With the Name Server Daemon</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch03.html#signals">Signals</a></span></dt>
</dl></dd>
</dl>
</div>
<p>
In this chapter we provide some suggested configurations along
with guidelines for their use. We suggest reasonable values for
certain option settings.
</p>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sample_configuration"></a>Sample Configurations</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="cache_only_sample"></a>A Caching-only Name Server</h3></div></div></div>
<p>
The following sample configuration is appropriate for a caching-only
name server for use by clients internal to a corporation. All
queries
from outside clients are refused using the <span class="command"><strong>allow-query</strong></span>
option. Alternatively, the same effect could be achieved using
suitable
firewall rules.
</p>
<pre class="programlisting">
// Two corporate subnets we wish to allow queries from.
acl corpnets { 192.168.4.0/24; 192.168.7.0/24; };
options {
// Working directory
directory "/etc/namedb";
allow-query { corpnets; };
};
// Provide a reverse mapping for the loopback
// address 127.0.0.1
zone "0.0.127.in-addr.arpa" {
type master;
file "localhost.rev";
notify no;
};
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="auth_only_sample"></a>An Authoritative-only Name Server</h3></div></div></div>
<p>
This sample configuration is for an authoritative-only server
that is the master server for "<code class="filename">example.com</code>"
and a slave for the subdomain "<code class="filename">eng.example.com</code>".
</p>
<pre class="programlisting">
options {
// Working directory
directory "/etc/namedb";
// Do not allow access to cache
allow-query-cache { none; };
// This is the default
allow-query { any; };
// Do not provide recursive service
recursion no;
};
// Provide a reverse mapping for the loopback
// address 127.0.0.1
zone "0.0.127.in-addr.arpa" {
type master;
file "localhost.rev";
notify no;
};
// We are the master server for example.com
zone "example.com" {
type master;
file "example.com.db";
// IP addresses of slave servers allowed to
// transfer example.com
allow-transfer {
192.168.4.14;
192.168.5.53;
};
};
// We are a slave server for eng.example.com
zone "eng.example.com" {
type slave;
file "eng.example.com.bk";
// IP address of eng.example.com master server
masters { 192.168.4.12; };
};
</pre>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="load_balancing"></a>Load Balancing</h2></div></div></div>
<p>
A primitive form of load balancing can be achieved in
the <acronym class="acronym">DNS</acronym> by using multiple records
(such as multiple A records) for one name.
</p>
<p>
For example, if you have three WWW servers with network addresses
of 10.0.0.1, 10.0.0.2 and 10.0.0.3, a set of records such as the
following means that clients will connect to each machine one third
of the time:
</p>
<div class="informaltable">
<table border="1">
<colgroup>
<col width="0.875in" class="1">
<col width="0.500in" class="2">
<col width="0.750in" class="3">
<col width="0.750in" class="4">
<col width="2.028in" class="5">
</colgroup>
<tbody>
<tr>
<td>
<p>
Name
</p>
</td>
<td>
<p>
TTL
</p>
</td>
<td>
<p>
CLASS
</p>
</td>
<td>
<p>
TYPE
</p>
</td>
<td>
<p>
Resource Record (RR) Data
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="literal">www</code>
</p>
</td>
<td>
<p>
<code class="literal">600</code>
</p>
</td>
<td>
<p>
<code class="literal">IN</code>
</p>
</td>
<td>
<p>
<code class="literal">A</code>
</p>
</td>
<td>
<p>
<code class="literal">10.0.0.1</code>
</p>
</td>
</tr>
<tr>
<td>
<p></p>
</td>
<td>
<p>
<code class="literal">600</code>
</p>
</td>
<td>
<p>
<code class="literal">IN</code>
</p>
</td>
<td>
<p>
<code class="literal">A</code>
</p>
</td>
<td>
<p>
<code class="literal">10.0.0.2</code>
</p>
</td>
</tr>
<tr>
<td>
<p></p>
</td>
<td>
<p>
<code class="literal">600</code>
</p>
</td>
<td>
<p>
<code class="literal">IN</code>
</p>
</td>
<td>
<p>
<code class="literal">A</code>
</p>
</td>
<td>
<p>
<code class="literal">10.0.0.3</code>
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p>
When a resolver queries for these records, <acronym class="acronym">BIND</acronym> will rotate
them and respond to the query with the records in a different
order. In the example above, clients will randomly receive
records in the order 1, 2, 3; 2, 3, 1; and 3, 1, 2. Most clients
will use the first record returned and discard the rest.
</p>
<p>
For more detail on ordering responses, check the
<span class="command"><strong>rrset-order</strong></span> sub-statement in the
<span class="command"><strong>options</strong></span> statement, see
<a class="xref" href="Bv9ARM.ch06.html#rrset_ordering" title="RRset Ordering">RRset Ordering</a>.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="ns_operations"></a>Name Server Operations</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="tools"></a>Tools for Use With the Name Server Daemon</h3></div></div></div>
<p>
This section describes several indispensable diagnostic,
administrative and monitoring tools available to the system
administrator for controlling and debugging the name server
daemon.
</p>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="diagnostic_tools"></a>Diagnostic Tools</h4></div></div></div>
<p>
The <span class="command"><strong>dig</strong></span>, <span class="command"><strong>host</strong></span>, and
<span class="command"><strong>nslookup</strong></span> programs are all command
line tools
for manually querying name servers. They differ in style and
output format.
</p>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term"><a name="dig"></a><span class="command"><strong>dig</strong></span></span></dt>
<dd>
<p>
<span class="command"><strong>dig</strong></span>
is the most versatile and complete of these lookup tools.
It has two modes: simple interactive
mode for a single query, and batch mode which executes a
query for
each in a list of several query lines. All query options are
accessible
from the command line.
</p>
<div class="cmdsynopsis"><p>
<code class="command">dig</code>
[@<em class="replaceable"><code>server</code></em>]
<em class="replaceable"><code>domain</code></em>
[<em class="replaceable"><code>query-type</code></em>]
[<em class="replaceable"><code>query-class</code></em>]
[+<em class="replaceable"><code>query-option</code></em>]
[-<em class="replaceable"><code>dig-option</code></em>]
[%<em class="replaceable"><code>comment</code></em>]
</p></div>
<p>
The usual simple use of <span class="command"><strong>dig</strong></span> will take the form
</p>
<p class="simpara">
<span class="command"><strong>dig @server domain query-type query-class</strong></span>
</p>
<p>
For more information and a list of available commands and
options, see the <span class="command"><strong>dig</strong></span> man
page.
</p>
</dd>
<dt><span class="term"><span class="command"><strong>host</strong></span></span></dt>
<dd>
<p>
The <span class="command"><strong>host</strong></span> utility emphasizes
simplicity
and ease of use. By default, it converts
between host names and Internet addresses, but its
functionality
can be extended with the use of options.
</p>
<div class="cmdsynopsis"><p>
<code class="command">host</code>
[-aCdlnrsTwv]
[-c <em class="replaceable"><code>class</code></em>]
[-N <em class="replaceable"><code>ndots</code></em>]
[-t <em class="replaceable"><code>type</code></em>]
[-W <em class="replaceable"><code>timeout</code></em>]
[-R <em class="replaceable"><code>retries</code></em>]
[-m <em class="replaceable"><code>flag</code></em>]
[-4]
[-6]
<em class="replaceable"><code>hostname</code></em>
[<em class="replaceable"><code>server</code></em>]
</p></div>
<p>
For more information and a list of available commands and
options, see the <span class="command"><strong>host</strong></span> man
page.
</p>
</dd>
<dt><span class="term"><span class="command"><strong>nslookup</strong></span></span></dt>
<dd>
<p><span class="command"><strong>nslookup</strong></span>
has two modes: interactive and
non-interactive. Interactive mode allows the user to
query name servers for information about various
hosts and domains or to print a list of hosts in a
domain. Non-interactive mode is used to print just
the name and requested information for a host or
domain.
</p>
<div class="cmdsynopsis"><p>
<code class="command">nslookup</code>
[-option...]
[
[<em class="replaceable"><code>host-to-find</code></em>]
| [- [server]]
]
</p></div>
<p>
Interactive mode is entered when no arguments are given (the
default name server will be used) or when the first argument
is a
hyphen (`-') and the second argument is the host name or
Internet address
of a name server.
</p>
<p>
Non-interactive mode is used when the name or Internet
address
of the host to be looked up is given as the first argument.
The
optional second argument specifies the host name or address
of a name server.
</p>
<p>
Due to its arcane user interface and frequently inconsistent
behavior, we do not recommend the use of <span class="command"><strong>nslookup</strong></span>.
Use <span class="command"><strong>dig</strong></span> instead.
</p>
</dd>
</dl></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="admin_tools"></a>Administrative Tools</h4></div></div></div>
<p>
Administrative tools play an integral part in the management
of a server.
</p>
<div class="variablelist"><dl class="variablelist">
<dt>
<a name="named-checkconf"></a><span class="term"><span class="command"><strong>named-checkconf</strong></span></span>
</dt>
<dd>
<p>
The <span class="command"><strong>named-checkconf</strong></span> program
checks the syntax of a <code class="filename">named.conf</code> file.
</p>
<div class="cmdsynopsis"><p>
<code class="command">named-checkconf</code>
[-jvz]
[-t <em class="replaceable"><code>directory</code></em>]
[<em class="replaceable"><code>filename</code></em>]
</p></div>
</dd>
<dt>
<a name="named-checkzone"></a><span class="term"><span class="command"><strong>named-checkzone</strong></span></span>
</dt>
<dd>
<p>
The <span class="command"><strong>named-checkzone</strong></span> program
checks a master file for
syntax and consistency.
</p>
<div class="cmdsynopsis"><p>
<code class="command">named-checkzone</code>
[-djqvD]
[-c <em class="replaceable"><code>class</code></em>]
[-o <em class="replaceable"><code>output</code></em>]
[-t <em class="replaceable"><code>directory</code></em>]
[-w <em class="replaceable"><code>directory</code></em>]
[-k <em class="replaceable"><code>(ignore|warn|fail)</code></em>]
[-n <em class="replaceable"><code>(ignore|warn|fail)</code></em>]
[-W <em class="replaceable"><code>(ignore|warn)</code></em>]
<em class="replaceable"><code>zone</code></em>
[<em class="replaceable"><code>filename</code></em>]
</p></div>
</dd>
<dt>
<a name="named-compilezone"></a><span class="term"><span class="command"><strong>named-compilezone</strong></span></span>
</dt>
<dd>
<p>
Similar to <span class="command"><strong>named-checkzone,</strong></span> but
it always dumps the zone content to a specified file
(typically in a different format).
</p>
</dd>
<dt>
<a name="rndc"></a><span class="term"><span class="command"><strong>rndc</strong></span></span>
</dt>
<dd>
<p>
The remote name daemon control
(<span class="command"><strong>rndc</strong></span>) program allows the
system
administrator to control the operation of a name server.
Since <acronym class="acronym">BIND</acronym> 9.2, <span class="command"><strong>rndc</strong></span>
supports all the commands of the BIND 8 <span class="command"><strong>ndc</strong></span>
utility except <span class="command"><strong>ndc start</strong></span> and
<span class="command"><strong>ndc restart</strong></span>, which were also
not supported in <span class="command"><strong>ndc</strong></span>'s
channel mode.
If you run <span class="command"><strong>rndc</strong></span> without any
options
it will display a usage message as follows:
</p>
<div class="cmdsynopsis"><p>
<code class="command">rndc</code>
[-c <em class="replaceable"><code>config</code></em>]
[-s <em class="replaceable"><code>server</code></em>]
[-p <em class="replaceable"><code>port</code></em>]
[-y <em class="replaceable"><code>key</code></em>]
<em class="replaceable"><code>command</code></em>
[<em class="replaceable"><code>command</code></em>...]
</p></div>
<p>See <a class="xref" href="man.rndc.html" title="rndc"><span class="refentrytitle"><span class="application">rndc</span></span>(8)</a> for details of
the available <span class="command"><strong>rndc</strong></span> commands.
</p>
<p>
<span class="command"><strong>rndc</strong></span> requires a configuration file,
since all
communication with the server is authenticated with
digital signatures that rely on a shared secret, and
there is no way to provide that secret other than with a
configuration file. The default location for the
<span class="command"><strong>rndc</strong></span> configuration file is
<code class="filename">/etc/rndc.conf</code>, but an
alternate
location can be specified with the <code class="option">-c</code>
option. If the configuration file is not found,
<span class="command"><strong>rndc</strong></span> will also look in
<code class="filename">/etc/rndc.key</code> (or whatever
<code class="varname">sysconfdir</code> was defined when
the <acronym class="acronym">BIND</acronym> build was
configured).
The <code class="filename">rndc.key</code> file is
generated by
running <span class="command"><strong>rndc-confgen -a</strong></span> as
described in
<a class="xref" href="Bv9ARM.ch06.html#controls_statement_definition_and_usage" title="controls Statement Definition and Usage">the section called “<span class="command"><strong>controls</strong></span> Statement Definition and
Usage”</a>.
</p>
<p>
The format of the configuration file is similar to
that of <code class="filename">named.conf</code>, but
limited to
only four statements, the <span class="command"><strong>options</strong></span>,
<span class="command"><strong>key</strong></span>, <span class="command"><strong>server</strong></span> and
<span class="command"><strong>include</strong></span>
statements. These statements are what associate the
secret keys to the servers with which they are meant to
be shared. The order of statements is not
significant.
</p>
<p>
The <span class="command"><strong>options</strong></span> statement has
three clauses:
<span class="command"><strong>default-server</strong></span>, <span class="command"><strong>default-key</strong></span>,
and <span class="command"><strong>default-port</strong></span>.
<span class="command"><strong>default-server</strong></span> takes a
host name or address argument and represents the server
that will
be contacted if no <code class="option">-s</code>
option is provided on the command line.
<span class="command"><strong>default-key</strong></span> takes
the name of a key as its argument, as defined by a <span class="command"><strong>key</strong></span> statement.
<span class="command"><strong>default-port</strong></span> specifies the
port to which
<span class="command"><strong>rndc</strong></span> should connect if no
port is given on the command line or in a
<span class="command"><strong>server</strong></span> statement.
</p>
<p>
The <span class="command"><strong>key</strong></span> statement defines a
key to be used
by <span class="command"><strong>rndc</strong></span> when authenticating
with
<span class="command"><strong>named</strong></span>. Its syntax is
identical to the
<span class="command"><strong>key</strong></span> statement in <code class="filename">named.conf</code>.
The keyword <strong class="userinput"><code>key</code></strong> is
followed by a key name, which must be a valid
domain name, though it need not actually be hierarchical;
thus,
a string like "<strong class="userinput"><code>rndc_key</code></strong>" is a valid
name.
The <span class="command"><strong>key</strong></span> statement has two
clauses:
<span class="command"><strong>algorithm</strong></span> and <span class="command"><strong>secret</strong></span>.
While the configuration parser will accept any string as the
argument
to algorithm, currently only the strings
"<strong class="userinput"><code>hmac-md5</code></strong>",
"<strong class="userinput"><code>hmac-sha1</code></strong>",
"<strong class="userinput"><code>hmac-sha224</code></strong>",
"<strong class="userinput"><code>hmac-sha256</code></strong>",
"<strong class="userinput"><code>hmac-sha384</code></strong>"
and "<strong class="userinput"><code>hmac-sha512</code></strong>"
have any meaning. The secret is a Base64 encoded string
as specified in RFC 3548.
</p>
<p>
The <span class="command"><strong>server</strong></span> statement
associates a key
defined using the <span class="command"><strong>key</strong></span>
statement with a server.
The keyword <strong class="userinput"><code>server</code></strong> is followed by a
host name or address. The <span class="command"><strong>server</strong></span> statement
has two clauses: <span class="command"><strong>key</strong></span> and <span class="command"><strong>port</strong></span>.
The <span class="command"><strong>key</strong></span> clause specifies the
name of the key
to be used when communicating with this server, and the
<span class="command"><strong>port</strong></span> clause can be used to
specify the port <span class="command"><strong>rndc</strong></span> should
connect
to on the server.
</p>
<p>
A sample minimal configuration file is as follows:
</p>
<pre class="programlisting">
key rndc_key {
algorithm "hmac-sha256";
secret
"c3Ryb25nIGVub3VnaCBmb3IgYSBtYW4gYnV0IG1hZGUgZm9yIGEgd29tYW4K";
};
options {
default-server 127.0.0.1;
default-key rndc_key;
};
</pre>
<p>
This file, if installed as <code class="filename">/etc/rndc.conf</code>,
would allow the command:
</p>
<p>
<code class="prompt">$ </code><strong class="userinput"><code>rndc reload</code></strong>
</p>
<p>
to connect to 127.0.0.1 port 953 and cause the name server
to reload, if a name server on the local machine were
running with
following controls statements:
</p>
<pre class="programlisting">
controls {
inet 127.0.0.1
allow { localhost; } keys { rndc_key; };
};
</pre>
<p>
and it had an identical key statement for
<code class="literal">rndc_key</code>.
</p>
<p>
Running the <span class="command"><strong>rndc-confgen</strong></span>
program will
conveniently create a <code class="filename">rndc.conf</code>
file for you, and also display the
corresponding <span class="command"><strong>controls</strong></span>
statement that you need to
add to <code class="filename">named.conf</code>.
Alternatively,
you can run <span class="command"><strong>rndc-confgen -a</strong></span>
to set up
a <code class="filename">rndc.key</code> file and not
modify
<code class="filename">named.conf</code> at all.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="signals"></a>Signals</h3></div></div></div>
<p>
Certain UNIX signals cause the name server to take specific
actions, as described in the following table. These signals can
be sent using the <span class="command"><strong>kill</strong></span> command.
</p>
<div class="informaltable">
<table border="1">
<colgroup>
<col width="1.125in" class="1">
<col width="4.000in" class="2">
</colgroup>
<tbody>
<tr>
<td>
<p><span class="command"><strong>SIGHUP</strong></span></p>
</td>
<td>
<p>
Causes the server to read <code class="filename">named.conf</code> and
reload the database.
</p>
</td>
</tr>
<tr>
<td>
<p><span class="command"><strong>SIGTERM</strong></span></p>
</td>
<td>
<p>
Causes the server to clean up and exit.
</p>
</td>
</tr>
<tr>
<td>
<p><span class="command"><strong>SIGINT</strong></span></p>
</td>
<td>
<p>
Causes the server to clean up and exit.
</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="navfooter">
<hr>
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left">
<a accesskey="p" href="Bv9ARM.ch02.html">Prev</a> </td>
<td width="20%" align="center"> </td>
<td width="40%" align="right"> <a accesskey="n" href="Bv9ARM.ch04.html">Next</a>
</td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Chapter 2. <acronym class="acronym">BIND</acronym> Resource Requirements </td>
<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
<td width="40%" align="right" valign="top"> Chapter 4. Advanced DNS Features</td>
</tr>
</table>
</div>
<p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.10.7</p>
</body>
</html>