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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 295 <li>2013
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 321
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 323
 324 <li>2012
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 348
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 350
 351 </ul></li>
 352
 353 <li>2011
 354 <ul>
 355
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 357
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 375
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 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
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 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
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 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</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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 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>
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 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
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 461
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 463
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 465
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 467
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 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 471
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 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (170)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (26)</a></li>
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 563
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 567
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 571
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 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 581
 582  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 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>