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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 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (12)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (16)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (306)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (195)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (37)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (56)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (65)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (56)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 560
 561 </ul>
 562
 563
 564     </div>
 565     <p style="text-align: right">
 566  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 567 </p>
 568
 569   </body>
 570 </html>