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="https://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="https://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="https://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap</a>, <a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.</div>
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 346
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 348
 349 <li>2013
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 375
 376 </ul></li>
 377
 378 <li>2012
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 381 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
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 404
 405 </ul></li>
 406
 407 <li>2011
 408 <ul>
 409
 410 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
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 432 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 433
 434 </ul></li>
 435
 436 <li>2010
 437 <ul>
 438
 439 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 440
 441 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 461 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 462
 463 </ul></li>
 464
 465 <li>2009
 466 <ul>
 467
 468 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 469
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 480 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 481
 482 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 483
 484 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 485
 486 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 487
 488 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 489
 490 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 491
 492 </ul></li>
 493
 494 <li>2008
 495 <ul>
 496
 497 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 498
 499 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 500
 501 </ul></li>
 502
 503 </ul>
 504
 505
 506
 507 <h2>Tags</h2>
 508 <ul>
 509
 510  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 511
 512  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 513
 514  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 515
 516  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 517
 518  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 519
 520  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 521
 522  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 523
 524  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 525
 526  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 527
 528  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (184)</a></li>
 529
 530  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 531
 532  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 533
 534  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 535
 536  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 537
 538  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (30)</a></li>
 539
 540  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 541
 542  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (440)</a></li>
 543
 544  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 545
 546  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 547
 548  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 549
 550  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 551
 552  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 553
 554  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 555
 556  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 557
 558  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 559
 560  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 561
 562  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 563
 564  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 565
 566  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 567
 568  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 569
 570  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 571
 572  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 573
 574  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 575
 576  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 577
 578  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (44)</a></li>
 579
 580  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 581
 582  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 583
 584  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (320)</a></li>
 585
 586  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
 587
 588  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (40)</a></li>
 589
 590  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 591
 592  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 593
 594  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 595
 596  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 597
 598  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 599
 600  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 601
 602  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 603
 604  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (16)</a></li>
 605
 606  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 607
 608  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 609
 610  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 611
 612  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 613
 614  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 615
 616  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 617
 618  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (74)</a></li>
 619
 620  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 621
 622  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 623
 624  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (64)</a></li>
 625
 626  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 627
 628  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 629
 630  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 631
 632  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (20)</a></li>
 633
 634  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (77)</a></li>
 635
 636  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 637
 638  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 639
 640 </ul>
 641
 642
 643     </div>
 644     <p style="text-align: right">
 645  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 646 </p>
 647
 648   </body>
 649 </html>