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   6     <title>Petter Reinholdtsen: Idea for a change to LDAP schemas allowing DNS and DHCP info to be combined into one object</title>
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  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
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  17 </div>
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  20     <div class="entry">
  21       <div class="title">Idea for a change to LDAP schemas allowing DNS and DHCP info to be combined into one object</div>
  22       <div class="date">24th June 2010</div>
  23       <div class="body"><p>A while back, I
  24 <a href="http://people.skolelinux.org/pere/blog/Time_for_new__LDAP_schemas_replacing_RFC_2307_.html">complained
  25 about the fact</a> that it is not possible with the provided schemas
  26 for storing DNS and DHCP information in LDAP to combine the two sets
  27 of information into one LDAP object representing a computer.</p>
  28
  29 <p>In the mean time, I discovered that a simple fix would be to make
  30 the dhcpHost object class auxiliary, to allow it to be combined with
  31 the dNSDomain object class, and thus forming one object for one
  32 computer when storing both DHCP and DNS information in LDAP.</p>
  33
  34 <p>If I understand this correctly, it is not safe to do this change
  35 without also changing the assigned number for the object class, and I
  36 do not know enough about LDAP schema design to do that properly for
  37 Debian Edu.</p>
  38
  39 <p>Anyway, for future reference, this is how I believe we could change
  40 the
  41 <a href="http://tools.ietf.org/html/draft-ietf-dhc-ldap-schema-00">DHCP
  42 schema</a> to solve at least part of the problem with the LDAP schemas
  43 available today from IETF.</p>
  44
  45 <pre>
  46 --- dhcp.schema    (revision 65192)
  47 +++ dhcp.schema    (working copy)
  48 @@ -376,7 +376,7 @@
  49  objectclass ( 2.16.840.1.113719.1.203.6.6
  50         NAME 'dhcpHost'
  51         DESC 'This represents information about a particular client'
  52 -       SUP top
  53 +       SUP top AUXILIARY
  54         MUST cn
  55         MAY  (dhcpLeaseDN $ dhcpHWAddress $ dhcpOptionsDN $ dhcpStatements $ dhcpComments $ dhcpOption)
  56         X-NDS_CONTAINMENT ('dhcpService' 'dhcpSubnet' 'dhcpGroup') )
  57 </pre>
  58
  59 <p>I very much welcome clues on how to do this properly for Debian
  60 Edu/Squeeze.  We provide the DHCP schema in our debian-edu-config
  61 package, and should thus be free to rewrite it as we see fit.</p>
  62
  63 <p>If you want to help out with implementing this for Debian Edu,
  64 please contact us on debian-edu@lists.debian.org.</p>
  65 </div>
  66
  67       <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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