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
 104 <li><a href="http://people.skolelinux.org/pere/blog/archive/2021/02/">February (1)</a></li>
 105
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 107
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 109
 110 <li><a href="http://people.skolelinux.org/pere/blog/archive/2021/07/">July (3)</a></li>
 111
 112 </ul></li>
 113
 114 <li>2020
 115 <ul>
 116
 117 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/02/">February (2)</a></li>
 118
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 120
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 122
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 124
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 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/07/">July (1)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/09/">September (1)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/10/">October (1)</a></li>
 132
 133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/11/">November (1)</a></li>
 134
 135 </ul></li>
 136
 137 <li>2019
 138 <ul>
 139
 140 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/01/">January (4)</a></li>
 141
 142 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/02/">February (3)</a></li>
 143
 144 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/03/">March (3)</a></li>
 145
 146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/05/">May (2)</a></li>
 147
 148 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/06/">June (5)</a></li>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/07/">July (2)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/08/">August (1)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/09/">September (1)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/11/">November (1)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 159
 160 </ul></li>
 161
 162 <li>2018
 163 <ul>
 164
 165 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 166
 167 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 174
 175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 186
 187 </ul></li>
 188
 189 <li>2017
 190 <ul>
 191
 192 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 193
 194 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 195
 196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 205
 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 213
 214 </ul></li>
 215
 216 <li>2016
 217 <ul>
 218
 219 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 220
 221 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 222
 223 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 224
 225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 242
 243 </ul></li>
 244
 245 <li>2015
 246 <ul>
 247
 248 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 249
 250 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 251
 252 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 253
 254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 271
 272 </ul></li>
 273
 274 <li>2014
 275 <ul>
 276
 277 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 278
 279 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 280
 281 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 282
 283 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 300
 301 </ul></li>
 302
 303 <li>2013
 304 <ul>
 305
 306 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 307
 308 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 309
 310 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 329
 330 </ul></li>
 331
 332 <li>2012
 333 <ul>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 338
 339 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 358
 359 </ul></li>
 360
 361 <li>2011
 362 <ul>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 367
 368 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 385
 386 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 387
 388 </ul></li>
 389
 390 <li>2010
 391 <ul>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 394
 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 396
 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
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 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 414
 415 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 416
 417 </ul></li>
 418
 419 <li>2009
 420 <ul>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 423
 424 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 425
 426 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 427
 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 439
 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 441
 442 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 443
 444 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 445
 446 </ul></li>
 447
 448 <li>2008
 449 <ul>
 450
 451 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 452
 453 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 454
 455 </ul></li>
 456
 457 </ul>
 458
 459
 460
 461 <h2>Tags</h2>
 462 <ul>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 481
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 563
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 571
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 579
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 588  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 589
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 591
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 593
 594
 595     </div>
 596     <p style="text-align: right">
 597  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 598 </p>
 599
 600   </body>
 601 </html>