blog/Idea_for_storing_LTSP_configuration_in_LDAP.html

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   6     <title>Petter Reinholdtsen: Idea for storing LTSP configuration in LDAP</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">Idea for storing LTSP configuration in LDAP</div>
  24       <div class="date">11th July 2010</div>
  25       <div class="body"><p>Vagrant mentioned on IRC today that ltsp_config now support
  26 sourcing files from /usr/share/ltsp/ltsp_config.d/ on the thin
  27 clients, and that this can be used to fetch configuration from LDAP if
  28 Debian Edu choose to store configuration there.</p>
  29
  30 <p>Armed with this information, I got inspired and wrote a test module
  31 to get configuration from LDAP.  The idea is to look up the MAC
  32 address of the client in LDAP, and look for attributes on the form
  33 ltspconfigsetting=value, and use this to export SETTING=value to the
  34 LTSP clients.</p>
  35
  36 <p>The goal is to be able to store the LTSP configuration attributes
  37 in a "computer" LDAP object used by both DNS and DHCP, and thus
  38 allowing us to store all information about a computer in one place.</p>
  39
  40 <p>This is a untested draft implementation, and I welcome feedback on
  41 this approach.  A real LDAP schema for the ltspClientAux objectclass
  42 need to be written.  Comments, suggestions, etc?</p>
  43
  44 <blockquote><pre>
  45 # Store in /opt/ltsp/$arch/usr/share/ltsp/ltsp_config.d/ldap-config
  46 #
  47 # Fetch LTSP client settings from LDAP based on MAC address
  48 #
  49 # Uses ethernet address as stored in the dhcpHost objectclass using
  50 # the dhcpHWAddress attribute or ethernet address stored in the
  51 # ieee802Device objectclass with the macAddress attribute.
  52 #
  53 # This module is written to be schema agnostic, and only depend on the
  54 # existence of attribute names.
  55 #
  56 # The LTSP configuration variables are saved directly using a
  57 # ltspConfig prefix and uppercasing the rest of the attribute name.
  58 # To set the SERVER variable, set the ltspConfigServer attribute.
  59 #
  60 # Some LDAP schema should be created with all the relevant
  61 # configuration settings.  Something like this should work:
  62 #
  63 # objectclass ( 1.1.2.2 NAME 'ltspClientAux'
  64 #     SUP top
  65 #     AUXILIARY
  66 #     MAY ( ltspConfigServer $ ltsConfigSound $ ... )
  67
  68 LDAPSERVER=$(debian-edu-ldapserver)
  69 if [ "$LDAPSERVER" ] ; then
  70     LDAPBASE=$(debian-edu-ldapserver -b)
  71     for MAC in $(LANG=C ifconfig |grep -i hwaddr| awk '{print $5}'|sort -u) ; do
  72         filter="(|(dhcpHWAddress=ethernet $MAC)(macAddress=$MAC))"
  73         ldapsearch -h "$LDAPSERVER" -b "$LDAPBASE" -v -x "$filter" | \
  74             grep '^ltspConfig' | while read attr value ; do
  75             # Remove prefix and convert to upper case
  76             attr=$(echo $attr | sed 's/^ltspConfig//i' | tr a-z A-Z)
  77             # bass value on to clients
  78             eval "$attr=$value; export $attr"
  79         done
  80     done
  81 fi
  82 </pre></blockquote>
  83
  84 <p>I'm not sure this shell construction will work, because I suspect
  85 the while block might end up in a subshell causing the variables set
  86 there to not show up in ltsp-config, but if that is the case I am sure
  87 the code can be restructured to make sure the variables are passed on.
  88 I expect that can be solved with some testing. :)</p>
  89
  90 <p>If you want to help out with implementing this for Debian Edu,
  91 please contact us on debian-edu@lists.debian.org.</p>
  92
  93 <p>Update 2010-07-17: I am aware of another effort to store LTSP
  94 configuration in LDAP that was created around year 2000 by
  95 <a href="http://www.pcxperience.com/thinclient/documentation/ldap.html">PC
  96 Xperience, Inc., 2000</a>.  I found its
  97 <a href="http://people.redhat.com/alikins/ltsp/ldap/">files</a> on a
  98 personal home page over at redhat.com.</p>
  99 </div>
 100
 101       <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>
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 317
 318 </ul></li>
 319
 320 <li>2013
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 346
 347 </ul></li>
 348
 349 <li>2012
 350 <ul>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 353
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 373
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 375
 376 </ul></li>
 377
 378 <li>2011
 379 <ul>
 380
 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 382
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 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 404
 405 </ul></li>
 406
 407 <li>2010
 408 <ul>
 409
 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
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 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
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 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 433
 434 </ul></li>
 435
 436 <li>2009
 437 <ul>
 438
 439 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 440
 441 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 442
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 444
 445 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 446
 447 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 448
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 450
 451 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 452
 453 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 454
 455 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 456
 457 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 458
 459 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 460
 461 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 462
 463 </ul></li>
 464
 465 <li>2008
 466 <ul>
 467
 468 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 469
 470 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 471
 472 </ul></li>
 473
 474 </ul>
 475
 476
 477
 478 <h2>Tags</h2>
 479 <ul>
 480
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 484
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 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (176)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (8)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (28)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (426)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
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 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
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 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
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 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 560
 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 562
 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 564
 565  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 566
 567  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 568
 569  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 570
 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 572
 573  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 574
 575  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 576
 577  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 578
 579  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 580
 581  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 582
 583  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 584
 585  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 586
 587  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (71)</a></li>
 588
 589  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
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 591  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 592
 593  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
 594
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 596
 597  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 598
 599  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 600
 601  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
 602
 603  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (75)</a></li>
 604
 605  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 606
 607  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 608
 609 </ul>
 610
 611
 612     </div>
 613     <p style="text-align: right">
 614  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 615 </p>
 616
 617   </body>
 618 </html>