blog/Combining_PowerDNS_and_ISC_DHCP_LDAP_objects.html

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   6     <title>Petter Reinholdtsen: Combining PowerDNS and ISC DHCP LDAP objects</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Combining PowerDNS and ISC DHCP LDAP objects</div>
  24       <div class="date">14th July 2010</div>
  25       <div class="body"><p>For a while now, I have wanted to find a way to change the DNS and
  26 DHCP services in Debian Edu to use the same LDAP objects for a given
  27 computer, to avoid the possibility of having a inconsistent state for
  28 a computer in LDAP (as in DHCP but no DNS entry or the other way
  29 around) and make it easier to add computers to LDAP.</p>
  30
  31 <p>I've looked at how powerdns and dhcpd is using LDAP, and using this
  32 information finally found a solution that seem to work.</p>
  33
  34 <p>The old setup required three LDAP objects for a given computer.
  35 One forward DNS entry, one reverse DNS entry and one DHCP entry.  If
  36 we switch powerdns to use its strict LDAP method (ldap-method=strict
  37 in pdns-debian-edu.conf), the forward and reverse DNS entries are
  38 merged into one while making it impossible to transfer the reverse map
  39 to a slave DNS server.</p>
  40
  41 <p>If we also replace the object class used to get the DNS related
  42 attributes to one allowing these attributes to be combined with the
  43 dhcphost object class, we can merge the DNS and DHCP entries into one.
  44 I've written such object class in the dnsdomainaux.schema file (need
  45 proper OIDs, but that is a minor issue), and tested the setup.  It
  46 seem to work.</p>
  47
  48 <p>With this test setup in place, we can get away with one LDAP object
  49 for both DNS and DHCP, and even the LTSP configuration I suggested in
  50 an earlier email.  The combined LDAP object will look something like
  51 this:</p>
  52
  53 <blockquote><pre>
  54   dn: cn=hostname,cn=group1,cn=THINCLIENTS,cn=DHCP Config,dc=skole,dc=skolelinux,dc=no
  55   cn: hostname
  56   objectClass: dhcphost
  57   objectclass: domainrelatedobject
  58   objectclass: dnsdomainaux
  59   associateddomain: hostname.intern
  60   arecord: 10.11.12.13
  61   dhcphwaddress: ethernet 00:00:00:00:00:00
  62   dhcpstatements: fixed-address hostname
  63   ldapconfigsound: Y
  64 </pre></blockquote>
  65
  66 <p>The DNS server uses the associateddomain and arecord entries, while
  67 the DHCP server uses the dhcphwaddress and dhcpstatements entries
  68 before asking DNS to resolve the fixed-adddress.  LTSP will use
  69 dhcphwaddress or associateddomain and the ldapconfig* attributes.</p>
  70
  71 <p>I am not yet sure if I can get the DHCP server to look for its
  72 dhcphost in a different location, to allow us to put the objects
  73 outside the "DHCP Config" subtree, but hope to figure out a way to do
  74 that.  If I can't figure out a way to do that, we can still get rid of
  75 the hosts subtree and move all its content into the DHCP Config tree
  76 (which probably should be renamed to be more related to the new
  77 content.  I suspect cn=dnsdhcp,ou=services or something like that
  78 might be a good place to put it.</p>
  79
  80 <p>If you want to help out with implementing this for Debian Edu,
  81 please contact us on debian-edu@lists.debian.org.</p>
  82 </div>
  83
  84       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.</div>
  85
  86
  87     </div>
  88
  89
  90
  91
  92     <div id="sidebar">
  93
  94
  95
  96 <h2>Archive</h2>
  97 <ul>
  98
  99 <li>2021
 100 <ul>
 101
 102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2021/01/">January (2)</a></li>
 103
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 105
 106 <li>2020
 107 <ul>
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 126
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 128
 129 <li>2019
 130 <ul>
 131
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 133
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 135
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 141
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 143
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 145
 146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/09/">September (1)</a></li>
 147
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 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 151
 152 </ul></li>
 153
 154 <li>2018
 155 <ul>
 156
 157 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 158
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 160
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 162
 163 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 164
 165 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 166
 167 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 174
 175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 178
 179 </ul></li>
 180
 181 <li>2017
 182 <ul>
 183
 184 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 185
 186 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 187
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 190 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 191
 192 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 193
 194 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 195
 196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 205
 206 </ul></li>
 207
 208 <li>2016
 209 <ul>
 210
 211 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 212
 213 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 214
 215 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
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 217 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
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 219 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
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 221 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
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 223 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
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 225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
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 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 234
 235 </ul></li>
 236
 237 <li>2015
 238 <ul>
 239
 240 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 241
 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 243
 244 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 245
 246 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 247
 248 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 249
 250 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 251
 252 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 253
 254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 263
 264 </ul></li>
 265
 266 <li>2014
 267 <ul>
 268
 269 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 270
 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 272
 273 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 274
 275 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
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 277 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
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 279 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 280
 281 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
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 284
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 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 292
 293 </ul></li>
 294
 295 <li>2013
 296 <ul>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
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 304 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
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 306 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
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 310 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
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 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 321
 322 </ul></li>
 323
 324 <li>2012
 325 <ul>
 326
 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 338
 339 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
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 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 350
 351 </ul></li>
 352
 353 <li>2011
 354 <ul>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 367
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 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
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 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 379
 380 </ul></li>
 381
 382 <li>2010
 383 <ul>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 390
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 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
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 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
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 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 408
 409 </ul></li>
 410
 411 <li>2009
 412 <ul>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
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 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
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 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
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 424 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
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 426 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
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 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 437
 438 </ul></li>
 439
 440 <li>2008
 441 <ul>
 442
 443 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 444
 445 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 446
 447 </ul></li>
 448
 449 </ul>
 450
 451
 452
 453 <h2>Tags</h2>
 454 <ul>
 455
 456  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (175)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 481
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 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
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 563
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 571
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 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (74)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 581
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 583
 584 </ul>
 585
 586
 587     </div>
 588     <p style="text-align: right">
 589  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 590 </p>
 591
 592   </body>
 593 </html>