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5 <title>Petter Reinholdtsen
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14 <a href=
"http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen
</a>
23 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Debian_Edu_roaming_workstation___at_the_university_of_Oslo.html">Debian Edu roaming workstation - at the university of Oslo
</a></div>
24 <div class=
"date">2010-
08-
03 23:
30</div>
26 <p>The new roaming workstation profile in Debian Edu/Squeeze is fairly
27 similar to the laptop setup am I working on using Ubuntu for the
28 University of Oslo, and just for the heck of it, I tested today how
29 hard it would be to integrate that profile into the university
30 infrastructure. In this case, it is the university LDAP server,
31 Active Directory Kerberos server and SMB mounting from the Netapp file
34 <p>I was pleasantly surprised that the only three files needed to be
35 changed (/etc/sssd/sssd.conf, /etc/ldap.conf and
36 /etc/mklocaluser.d/
20-debian-edu-config) and one file had to be added
37 (/usr/share/perl5/Debian/Edu_Local.pm), to get the client working.
38 Most of the changes were to get the client to use the university LDAP
39 for NSS and Kerberos server for PAM, but one was to change a hard
40 coded DNS domain name in the mklocaluser hook from .intern to
43 <p>This testing was so encouraging, that I went ahead and adjusted the
44 Debian Edu scripts and setup in subversion to centralise the roaming
45 workstation setup a bit more and avoid the hardcoded DNS domain name,
46 so that when I test this tomorrow, I expect to get away with modifying
47 only /etc/sssd/sssd.conf and /etc/ldap.conf to get it to use the
48 university servers.
</p>
50 <p>My goal is to get the clients to have no hardcoded settings and
51 fetch all their initial setup during installation and first boot, to
52 allow them to be inserted also into environments where the default
53 setup in Debian Edu has been changed or as with the university, where
54 the environment is different but provides the protocols Debian Edu
61 Tags:
<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/nuug">nuug
</a>.
65 <div class=
"padding"></div>
68 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Circular_package_dependencies_harms_apt_recovery.html">Circular package dependencies harms apt recovery
</a></div>
69 <div class=
"date">2010-
07-
27 23:
50</div>
71 <p>I discovered this while doing
72 <a href=
"http://people.skolelinux.org/pere/blog/Automatic_upgrade_testing_from_Lenny_to_Squeeze.html">automated
73 testing of upgrades from Debian Lenny to Squeeze
</a>. A few packages
74 in Debian still got circular dependencies, and it is often claimed
75 that apt and aptitude should be able to handle this just fine, but
76 some times these dependency loops causes apt to fail.
</p>
78 <p>An example is from todays
79 <a href=
"http://people.skolelinux.org/~pere/debian-upgrade-testing//test-20100727-lenny-squeeze-kde-aptitude.txt">upgrade
80 of KDE using aptitude
</a>. In it, a bug in kdebase-workspace-data
81 causes perl-modules to fail to upgrade. The cause is simple. If a
82 package fail to unpack, then only part of packages with the circular
83 dependency might end up being unpacked when unpacking aborts, and the
84 ones already unpacked will fail to configure in the recovery phase
85 because its dependencies are unavailable.
</p>
87 <p>In this log, the problem manifest itself with this error:
</p>
90 dpkg: dependency problems prevent configuration of perl-modules:
91 perl-modules depends on perl (
>=
5.10.1-
1); however:
92 Version of perl on system is
5.10.0-
19lenny
2.
93 dpkg: error processing perl-modules (--configure):
94 dependency problems - leaving unconfigured
97 <p>The perl/perl-modules circular dependency is already
98 <a href=
"http://bugs.debian.org/527917">reported as a bug
</a>, and will
99 hopefully be solved as soon as possible, but it is not the only one,
100 and each one of these loops in the dependency tree can cause similar
101 failures. Of course, they only occur when there are bugs in other
102 packages causing the unpacking to fail, but it is rather nasty when
103 the failure of one package causes the problem to become worse because
104 of dependency loops.
</p>
107 <a href=
"http://lists.debian.org/debian-devel/2010/06/msg00116.html">the
108 tireless effort by Bill Allombert
</a>, the number of circular
110 <a href=
"http://debian.semistable.com/debgraph.out.html">left in Debian
111 is dropping
</a>, and perhaps it will reach zero one day. :)
</p>
113 <p>Todays testing also exposed a bug in
114 <a href=
"http://bugs.debian.org/590605">update-notifier
</a> and
115 <a href=
"http://bugs.debian.org/590604">different behaviour
</a> between
116 apt-get and aptitude, the latter possibly caused by some circular
117 dependency. Reported both to BTS to try to get someone to look at
124 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/debian">debian
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug
</a>.
128 <div class=
"padding"></div>
131 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/First_Debian_Edu_test_release__alpha0__based_on_Squeeze_is_released.html">First Debian Edu test release (alpha0) based on Squeeze is released
</a></div>
132 <div class=
"date">2010-
07-
27 17:
45</div>
134 <p>I just posted this announcement culminating several months of work
135 with the next Debian Edu release. Not nearly done, but one major step
139 <p>This is the first test release based on Squeeze. The focus of this
140 release is to test the user application selection. To have a look,
141 install the standalone profile and let the developers know if the set
142 of installed packages i.e. applications should be modified. If some
143 user application is missing, or if there are some applications that no
144 longer make sense to be included in Debian Edu, please let us know.
145 Also, if a useful application is missing the translation for your
146 language of choice, please let us know too.
</p>
148 <p>In addition, feedback and help to polish the desktop (menus,
149 artwork, starters, etc.) is appreciated. We would like to ship a nice
150 and handy KDE4 desktop targeted for schools out of the box.
</p>
152 <p>The other profiles should be installable, but there is a lot more
153 work left to be done before they are ready, so do not expect to
156 <p>Changes compared to the lenny based version
</p>
159 <li>Everything from Debian Squeeze
161 <li>Desktop environment KDE
4.4 =
> the new KDE desktop in
162 combination with some new artwork
163 <li>Web browser Iceweasel
3.5
164 <li>OpenOffice.org
3.2
165 <li>Educational toolbox GCompris
9.3
166 <li>Music creator Rosegarden
10.04.2
167 <li>Image editor Gimp
2.6.10
168 <li>Virtual universe Celestia
1.6.0
169 <li>Virtual stargazer Stellarium
0.10.4
170 <li>3D modeler Blender
2.49.2 (new application)
171 <li>Video editor Kdenlive
0.7.7 (new application)
173 <li>Now using Kerberos for password checking (migration not finished).
179 <li>SMTP (sender verification)
182 <li>New experimental roaming workstation profile for laptops.
</li>
183 <li>Show welcome page to users when they first log in. The URL is
184 fetched from LDAP.
</li>
185 <li>New LXDE desktop option, in addition to KDE (default) and Gnome.
</li>
186 <li>General cleanup (not finished)
</li>
188 <p>The following features are not working as they should
</p>
191 <li>No web based administration tool for creating users and groups. The
192 scripts ldap-createuser-krb and ldap-add-user-to-group can be used
194 <li>DVD installs are missing debian-installer images for the PXE boot,
195 and do not set up the PXE menu on eth0 because of this. LTSP
196 clients should still boot from eth1 on thin client servers.
</li>
197 <li>The restructured KDE menu is not implemented.
</li>
198 <li>The LDAP server setup need to be reviewed for security.
</li>
199 <li>The LDAP directory structure need to be reworked.
</li>
200 <li>Different sets of packages are installed when using the DVD and the
201 netinst CD. More packages are installed using the netinst CD.
</li>
202 <li>The jackd package fail to install. This is believed to be caused by
203 some ongoing transition, and hopefully should be solved soon. The
204 jackd1 package can be installed manually for those that need it.
</li>
205 <li>Some packages lack translations. See
206 http://wiki.debian.org/DebianEdu/Status/Squeeze for updated status,
207 and help out with translations.
</li>
210 <p>To download this multiarch netinstall release you can use
</p>
213 <li><a href=
"ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso">ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-CD.iso
</a></li>
214 <li><a href=
"http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso">http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-CD.iso
</a></li>
215 <li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-CD.iso
</li>
217 <p>To download this multiarch dvd release you can use
</p>
220 <li><a href=
"ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso">ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-DVD.iso
</a></li>
221 <li><a href=
"http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso">http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-DVD.iso
</a></li>
222 <li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/squeeze-alpha/debian-edu-
6.0.0+edua0-DVD.iso
</li>
225 <p>There is no source DVD available yet. It will be prepared when we
226 get closer to the final release.
</p>
228 <p>The MD5SUM of these images are
</p>
231 <li>3dbf45d59f42a53518b6e3c9ec3b5eb6 debian-edu-
6.0.0+edua0-CD.iso
</li>
232 <li>22f2cbfce281d1c6e478be452638675d debian-edu-
6.0.0+edua0-DVD.iso
</li>
235 <p>The SHA1SUM of these images are
</p>
237 <li>c53d1b69b40cf37cd27aefaf33f6f6a3821bedf0 debian-edu-
6.0.0+edua0-CD.iso
</li>
238 <li>2ec29d7db676d59d32197b05c277ffe16348376c debian-edu-
6.0.0+edua0-DVD.iso
</li>
240 <p>How to report bugs:
241 http://wiki.debian.org/DebianEdu/HowTo/ReportBugsInBugzilla
</p>
243 <p>Please direct replies to debian-edu@lists.debian.org
</p>
250 Tags:
<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/nuug">nuug
</a>.
254 <div class=
"padding"></div>
257 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/One_step_closer_to_single_signon_in_Debian_Edu.html">One step closer to single signon in Debian Edu
</a></div>
258 <div class=
"date">2010-
07-
25 10:
00</div>
260 <p>The last few months me and the other Debian Edu developers have
261 been working hard to get the Debian/Squeeze based version of Debian
262 Edu/Skolelinux into shape. This future version will use Kerberos for
263 authentication, and services are slowly migrated to single signon,
264 getting rid of password questions one at the time.
</p>
266 <p>It will also feature a roaming workstation profile with local home
267 directory, for laptops that are only some times on the Skolelinux
268 network, and for this profile a shortcut is created in Gnome and KDE
269 to gain access to the users home directory on the file server. This
270 shortcut uses SMB at the moment, and yesterday I had time to test if
271 SMB mounting had started working in KDE after we added the cifs-utils
272 package. I was pleasantly surprised how well it worked.
</p>
274 <p>Thanks to the recent changes to our samba configuration to get it
275 to use Kerberos for authentication, there were no question about user
276 password when mounting the SMB volume. A simple click on the shortcut
277 in the KDE menu, and a window with the home directory popped
280 <p>One step closer to a single signon solution out of the box in
281 Debian Edu. We already had PAM, LDAP, IMAP and SMTP in place, and now
282 also Samba. Next step is Cups and hopefully also NFS.
</p>
284 <p>We had planned a alpha0 release of Debian Edu for today, but thanks
285 to the autobuilder administrators for some architectures being slow to
286 sign packages, we are still missing the fixed LTSP package we need for
287 the release. It was uploaded three days ago with urgency=high, and if
288 it had entered testing yesterday we would have been able to test it in
289 time for a alpha0 release today. As the binaries for ia64 and powerpc
290 still not uploaded to the Debian archive, we need to delay the alpha
291 release another day.
</p>
293 <p>If you want to help out with implementing Kerberos for Debian Edu,
294 please contact us on debian-edu@lists.debian.org.
</p>
300 Tags:
<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/nuug">nuug
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet
</a>.
304 <div class=
"padding"></div>
307 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Digitale_restriksjonsmekanismer_fikk_meg_til____slutte____kj__pe_musikk.html">Digitale restriksjonsmekanismer fikk meg til å slutte å kjøpe musikk
</a></div>
308 <div class=
"date">2010-
07-
22 23:
50</div>
310 <p>For mange år siden slutte jeg å kjøpe musikk-CDer. Årsaken var at
311 musikkbransjen var godt i gang med å selge platene sine med DRM som
312 gjorde at jeg ikke fikk spilt av musikken jeg kjøpte på utstyret jeg
313 hadde tilgjengelig, dvs. min datamaskin. Det var umulig å se på en
314 plate om den var ødelagt eller ikke, og jeg hadde jo allerede en
315 anseelig samling med plater, så jeg bestemme meg for å slutte å gi
316 penger til en bransje som åpenbart ikke respekterte meg.
</p>
318 <p>Jeg har mange titalls dager med musikk på CD i dag. Det meste er
319 lagt i et stort arkiv som kan spilles av fra husets datamaskiner (har
320 ikke rukket rippe alt). Jeg ser dermed ikke behovet for å skaffe mer
321 musikk. De fleste av mine favoritter er i hus, og jeg er dermed godt
324 <p>Hvis musikkbransjen ønsker mine penger, så må de demonstrere at de
325 setter pris på meg som kunde, og ikke skremme meg bort med DRM og
326 antydninger om at kundene er kriminelle.
</p>
328 <p>Filmbransjen er like ille, men mens musikk gjerne varer lenge, er
329 filmer mer ferskvare. Har dermed ikke helt sluttet å kjøpe filmer, men
330 holder meg til DVD-filmer som kan spilles av på mine Linuxbokser.
331 Kommer neppe til å ta i bruk Blueray, og ei heller de nye DRM-greiene
332 «Ultraviolet» som be annonsert her om dagen.
</p>
338 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern
</a>.
342 <div class=
"padding"></div>
345 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/OpenStreetmap_one_step_closer_to_having_routing_on_its_front_page.html">OpenStreetmap one step closer to having routing on its front page
</a></div>
346 <div class=
"date">2010-
07-
18 16:
45</div>
349 <a href=
"http://feedproxy.google.com/~r/Opengeodata/~3/wUTCzDZk3lc/project-of-the-week-which-way-home">todays
350 opengeodata blog entry
</a>, I just discovered that the
351 OpenStreetmap.org site have gotten
352 <a href=
"http://nroets.dev.openstreetmap.org/demo/index.html?layers=B000FTFTT">support
353 for calculating routes
</a>. The support is still experimental and
354 only available from the development server, until more experience is
355 gathered on the user interface and any scalability issues.
</p>
357 <p>Earlier, the routing I knew about using the OpenStreetmap.org data
358 was provided by
<a href=
"http://maps.cloudmade.com/">Cloudmade
</a>,
359 but having it on the main page is required to make everyone aware of
360 the issue. I've had people reject Openstreetmap.org as a viable
361 alternative for them because the front page lacked routing support,
362 and I hope their needs will be catered for when routing show up on the
363 www.openstreetmap.org front page.
</p>
369 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/kart">kart
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/web">web
</a>.
373 <div class=
"padding"></div>
376 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/What_are_they_searching_for___PowerDNS_and_ISC_DHCP_in_LDAP.html">What are they searching for - PowerDNS and ISC DHCP in LDAP
</a></div>
377 <div class=
"date">2010-
07-
17 21:
00</div>
380 <a href=
"http://people.skolelinux.org/pere/blog/Time_for_new__LDAP_schemas_replacing_RFC_2307_.html">followup
</a>
382 <a href=
"http://people.skolelinux.org/pere/blog/Idea_for_a_change_to_LDAP_schemas_allowing_DNS_and_DHCP_info_to_be_combined_into_one_object.html">previous
384 <a href=
"http://people.skolelinux.org/pere/blog/Combining_PowerDNS_and_ISC_DHCP_LDAP_objects.html">merging
385 all
</a> the computer related LDAP objects in Debian Edu.
</p>
387 <p>As a step to try to see if it possible to merge the DNS and DHCP
388 LDAP objects, I have had a look at how the packages pdns-backend-ldap
389 and dhcp3-server-ldap in Debian use the LDAP server. The two
390 implementations are quite different in how they use LDAP.
</p>
392 To get this information, I started slapd with debugging enabled and
393 dumped the debug output to a file to get the LDAP searches performed
394 on a Debian Edu main-server. Here is a summary.
396 <p><strong>powerdns
</strong></p>
398 <a href=
"http://www.linuxnetworks.de/doc/index.php/PowerDNS_LDAP_Backend">Clues
399 on how to
</a> set up PowerDNS to use a LDAP backend is available on
402 <p>PowerDNS have two modes of operation using LDAP as its backend.
403 One "strict" mode where the forward and reverse DNS lookups are done
404 using the same LDAP objects, and a "tree" mode where the forward and
405 reverse entries are in two different subtrees in LDAP with a structure
406 based on the DNS names, as in tjener.intern and
407 2.2.0.10.in-addr.arpa.
</p>
409 <p>In tree mode, the server is set up to use a LDAP subtree as its
410 base, and uses a "base" scoped search for the DNS name by adding
411 "dc=tjener,dc=intern," to the base with a filter for
412 "(associateddomain=tjener.intern)" for the forward entry and
413 "dc=
2,dc=
2,dc=
0,dc=
10,dc=in-addr,dc=arpa," with a filter for
414 "(associateddomain=
2.2.0.10.in-addr.arpa)" for the reverse entry. For
415 forward entries, it is looking for attributes named dnsttl, arecord,
416 nsrecord, cnamerecord, soarecord, ptrrecord, hinforecord, mxrecord,
417 txtrecord, rprecord, afsdbrecord, keyrecord, aaaarecord, locrecord,
418 srvrecord, naptrrecord, kxrecord, certrecord, dsrecord, sshfprecord,
419 ipseckeyrecord, rrsigrecord, nsecrecord, dnskeyrecord, dhcidrecord,
420 spfrecord and modifytimestamp. For reverse entries it is looking for
421 the attributes dnsttl, arecord, nsrecord, cnamerecord, soarecord,
422 ptrrecord, hinforecord, mxrecord, txtrecord, rprecord, aaaarecord,
423 locrecord, srvrecord, naptrrecord and modifytimestamp. The equivalent
424 ldapsearch commands could look like this:
</p>
428 -b dc=tjener,dc=intern,ou=hosts,dc=skole,dc=skolelinux,dc=no \
429 -s base -x '(associateddomain=tjener.intern)' dNSTTL aRecord nSRecord \
430 cNAMERecord sOARecord pTRRecord hInfoRecord mXRecord tXTRecord \
431 rPRecord aFSDBRecord KeyRecord aAAARecord lOCRecord sRVRecord \
432 nAPTRRecord kXRecord certRecord dSRecord sSHFPRecord iPSecKeyRecord \
433 rRSIGRecord nSECRecord dNSKeyRecord dHCIDRecord sPFRecord modifyTimestamp
436 -b dc=
2,dc=
2,dc=
0,dc=
10,dc=in-addr,dc=arpa,ou=hosts,dc=skole,dc=skolelinux,dc=no \
437 -s base -x '(associateddomain=
2.2.0.10.in-addr.arpa)'
438 dnsttl, arecord, nsrecord, cnamerecord soarecord ptrrecord \
439 hinforecord mxrecord txtrecord rprecord aaaarecord locrecord \
440 srvrecord naptrrecord modifytimestamp
443 <p>In Debian Edu/Lenny, the PowerDNS tree mode is used with
444 ou=hosts,dc=skole,dc=skolelinux,dc=no as the base, and these are two
445 example LDAP objects used there. In addition to these objects, the
446 parent objects all th way up to ou=hosts,dc=skole,dc=skolelinux,dc=no
450 dn: dc=tjener,dc=intern,ou=hosts,dc=skole,dc=skolelinux,dc=no
452 objectclass: dnsdomain
453 objectclass: domainrelatedobject
456 associateddomain: tjener.intern
458 dn: dc=
2,dc=
2,dc=
0,dc=
10,dc=in-addr,dc=arpa,ou=hosts,dc=skole,dc=skolelinux,dc=no
460 objectclass: dnsdomain2
461 objectclass: domainrelatedobject
463 ptrrecord: tjener.intern
464 associateddomain:
2.2.0.10.in-addr.arpa
467 <p>In strict mode, the server behaves differently. When looking for
468 forward DNS entries, it is doing a "subtree" scoped search with the
469 same base as in the tree mode for a object with filter
470 "(associateddomain=tjener.intern)" and requests the attributes dnsttl,
471 arecord, nsrecord, cnamerecord, soarecord, ptrrecord, hinforecord,
472 mxrecord, txtrecord, rprecord, aaaarecord, locrecord, srvrecord,
473 naptrrecord and modifytimestamp. For reverse entires it also do a
474 subtree scoped search but this time the filter is "(arecord=
10.0.2.2)"
475 and the requested attributes are associateddomain, dnsttl and
476 modifytimestamp. In short, in strict mode the objects with ptrrecord
477 go away, and the arecord attribute in the forward object is used
480 <p>The forward and reverse searches can be simulated using ldapsearch
484 ldapsearch -h ldap -b ou=hosts,dc=skole,dc=skolelinux,dc=no -s sub -x \
485 '(associateddomain=tjener.intern)' dNSTTL aRecord nSRecord \
486 cNAMERecord sOARecord pTRRecord hInfoRecord mXRecord tXTRecord \
487 rPRecord aFSDBRecord KeyRecord aAAARecord lOCRecord sRVRecord \
488 nAPTRRecord kXRecord certRecord dSRecord sSHFPRecord iPSecKeyRecord \
489 rRSIGRecord nSECRecord dNSKeyRecord dHCIDRecord sPFRecord modifyTimestamp
491 ldapsearch -h ldap -b ou=hosts,dc=skole,dc=skolelinux,dc=no -s sub -x \
492 '(arecord=
10.0.2.2)' associateddomain dnsttl modifytimestamp
495 <p>In addition to the forward and reverse searches , there is also a
496 search for SOA records, which behave similar to the forward and
499 <p>A thing to note with the PowerDNS behaviour is that it do not
500 specify any objectclass names, and instead look for the attributes it
501 need to generate a DNS reply. This make it able to work with any
502 objectclass that provide the needed attributes.
</p>
504 <p>The attributes are normally provided in the cosine (RFC
1274) and
505 dnsdomain2 schemas. The latter is used for reverse entries like
506 ptrrecord and recent DNS additions like aaaarecord and srvrecord.
</p>
508 <p>In Debian Edu, we have created DNS objects using the object classes
509 dcobject (for dc), dnsdomain or dnsdomain2 (structural, for the DNS
510 attributes) and domainrelatedobject (for associatedDomain). The use
511 of structural object classes make it impossible to combine these
512 classes with the object classes used by DHCP.
</p>
514 <p>There are other schemas that could be used too, for example the
515 dnszone structural object class used by Gosa and bind-sdb for the DNS
516 attributes combined with the domainrelatedobject object class, but in
517 this case some unused attributes would have to be included as well
518 (zonename and relativedomainname).
</p>
520 <p>My proposal for Debian Edu would be to switch PowerDNS to strict
521 mode and not use any of the existing objectclasses (dnsdomain,
522 dnsdomain2 and dnszone) when one want to combine the DNS information
523 with DHCP information, and instead create a auxiliary object class
524 defined something like this (using the attributes defined for
525 dnsdomain and dnsdomain2 or dnszone):
</p>
528 objectclass ( some-oid NAME 'dnsDomainAux'
531 MAY ( ARecord $ MDRecord $ MXRecord $ NSRecord $ SOARecord $ CNAMERecord $
532 DNSTTL $ DNSClass $ PTRRecord $ HINFORecord $ MINFORecord $
533 TXTRecord $ SIGRecord $ KEYRecord $ AAAARecord $ LOCRecord $
534 NXTRecord $ SRVRecord $ NAPTRRecord $ KXRecord $ CERTRecord $
535 A6Record $ DNAMERecord
539 <p>This will allow any object to become a DNS entry when combined with
540 the domainrelatedobject object class, and allow any entity to include
541 all the attributes PowerDNS wants. I've sent an email to the PowerDNS
542 developers asking for their view on this schema and if they are
543 interested in providing such schema with PowerDNS, and I hope my
544 message will be accepted into their mailing list soon.
</p>
546 <p><strong>ISC dhcp
</strong></p>
548 <p>The DHCP server searches for specific objectclass and requests all
549 the object attributes, and then uses the attributes it want. This
550 make it harder to figure out exactly what attributes are used, but
551 thanks to the working example in Debian Edu I can at least get an idea
552 what is needed without having to read the source code.
</p>
554 <p>In the DHCP server configuration, the LDAP base to use and the
555 search filter to use to locate the correct dhcpServer entity is
556 stored. These are the relevant entries from
557 /etc/dhcp3/dhcpd.conf:
</p>
560 ldap-base-dn "dc=skole,dc=skolelinux,dc=no";
561 ldap-dhcp-server-cn "dhcp";
564 <p>The DHCP server uses this information to nest all the DHCP
565 configuration it need. The cn "dhcp" is located using the given LDAP
566 base and the filter "(&(objectClass=dhcpServer)(cn=dhcp))". The
567 search result is this entry:
</p>
570 dn: cn=dhcp,dc=skole,dc=skolelinux,dc=no
573 objectClass: dhcpServer
574 dhcpServiceDN: cn=DHCP Config,dc=skole,dc=skolelinux,dc=no
577 <p>The content of the dhcpServiceDN attribute is next used to locate the
578 subtree with DHCP configuration. The DHCP configuration subtree base
579 is located using a base scope search with base "cn=DHCP
580 Config,dc=skole,dc=skolelinux,dc=no" and filter
581 "(&(objectClass=dhcpService)(|(dhcpPrimaryDN=cn=dhcp,dc=skole,dc=skolelinux,dc=no)(dhcpSecondaryDN=cn=dhcp,dc=skole,dc=skolelinux,dc=no)))".
582 The search result is this entry:
</p>
585 dn: cn=DHCP Config,dc=skole,dc=skolelinux,dc=no
588 objectClass: dhcpService
589 objectClass: dhcpOptions
590 dhcpPrimaryDN: cn=dhcp, dc=skole,dc=skolelinux,dc=no
591 dhcpStatements: ddns-update-style none
592 dhcpStatements: authoritative
593 dhcpOption: smtp-server code
69 = array of ip-address
594 dhcpOption: www-server code
72 = array of ip-address
595 dhcpOption: wpad-url code
252 = text
598 <p>Next, the entire subtree is processed, one level at the time. When
599 all the DHCP configuration is loaded, it is ready to receive requests.
600 The subtree in Debian Edu contain objects with object classes
601 top/dhcpService/dhcpOptions, top/dhcpSharedNetwork/dhcpOptions,
602 top/dhcpSubnet, top/dhcpGroup and top/dhcpHost. These provide options
603 and information about netmasks, dynamic range etc. Leaving out the
604 details here because it is not relevant for the focus of my
605 investigation, which is to see if it is possible to merge dns and dhcp
606 related computer objects.
</p>
608 <p>When a DHCP request come in, LDAP is searched for the MAC address
609 of the client (
00:
00:
00:
00:
00:
00 in this example), using a subtree
610 scoped search with "cn=DHCP Config,dc=skole,dc=skolelinux,dc=no" as
611 the base and "(&(objectClass=dhcpHost)(dhcpHWAddress=ethernet
612 00:
00:
00:
00:
00:
00))" as the filter. This is what a host object look
616 dn: cn=hostname,cn=group1,cn=THINCLIENTS,cn=DHCP Config,dc=skole,dc=skolelinux,dc=no
619 objectClass: dhcpHost
620 dhcpHWAddress: ethernet
00:
00:
00:
00:
00:
00
621 dhcpStatements: fixed-address hostname
624 <p>There is less flexiblity in the way LDAP searches are done here.
625 The object classes need to have fixed names, and the configuration
626 need to be stored in a fairly specific LDAP structure. On the
627 positive side, the invidiual dhcpHost entires can be anywhere without
628 the DN pointed to by the dhcpServer entries. The latter should make
629 it possible to group all host entries in a subtree next to the
630 configuration entries, and this subtree can also be shared with the
631 DNS server if the schema proposed above is combined with the dhcpHost
632 structural object class.
634 <p><strong>Conclusion
</strong></p>
636 <p>The PowerDNS implementation seem to be very flexible when it come
637 to which LDAP schemas to use. While its "tree" mode is rigid when it
638 come to the the LDAP structure, the "strict" mode is very flexible,
639 allowing DNS objects to be stored anywhere under the base cn specified
640 in the configuration.
</p>
642 <p>The DHCP implementation on the other hand is very inflexible, both
643 regarding which LDAP schemas to use and which LDAP structure to use.
644 I guess one could implement ones own schema, as long as the
645 objectclasses and attributes have the names used, but this do not
646 really help when the DHCP subtree need to have a fairly fixed
649 <p>Based on the observed behaviour, I suspect a LDAP structure like
650 this might work for Debian Edu:
</p>
654 cn=machine-info (dhcpService) - dhcpServiceDN points here
656 cn=dhcp-internal (dhcpSharedNetwork/dhcpOptions)
657 cn=
10.0.2.0 (dhcpSubnet)
658 cn=group1 (dhcpGroup/dhcpOptions)
659 cn=dhcp-thinclients (dhcpSharedNetwork/dhcpOptions)
660 cn=
192.168.0.0 (dhcpSubnet)
661 cn=group1 (dhcpGroup/dhcpOptions)
662 ou=machines - PowerDNS base points here
663 cn=hostname (dhcpHost/domainrelatedobject/dnsDomainAux)
666 <P>This is not tested yet. If the DHCP server require the dhcpHost
667 entries to be in the dhcpGroup subtrees, the entries can be stored
668 there instead of a common machines subtree, and the PowerDNS base
669 would have to be moved one level up to the machine-info subtree.
</p>
671 <p>The combined object under the machines subtree would look something
675 dn: dc=hostname,ou=machines,cn=machine-info,dc=skole,dc=skolelinux,dc=no
678 objectClass: dhcpHost
679 objectclass: domainrelatedobject
680 objectclass: dnsDomainAux
681 associateddomain: hostname.intern
683 dhcpHWAddress: ethernet
00:
00:
00:
00:
00:
00
684 dhcpStatements: fixed-address hostname.intern
687 </p>One could even add the LTSP configuration associated with a given
688 machine, as long as the required attributes are available in a
689 auxiliary object class.
</p>
695 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>.
699 <div class=
"padding"></div>
702 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Combining_PowerDNS_and_ISC_DHCP_LDAP_objects.html">Combining PowerDNS and ISC DHCP LDAP objects
</a></div>
703 <div class=
"date">2010-
07-
14 23:
45</div>
705 <p>For a while now, I have wanted to find a way to change the DNS and
706 DHCP services in Debian Edu to use the same LDAP objects for a given
707 computer, to avoid the possibility of having a inconsistent state for
708 a computer in LDAP (as in DHCP but no DNS entry or the other way
709 around) and make it easier to add computers to LDAP.
</p>
711 <p>I've looked at how powerdns and dhcpd is using LDAP, and using this
712 information finally found a solution that seem to work.
</p>
714 <p>The old setup required three LDAP objects for a given computer.
715 One forward DNS entry, one reverse DNS entry and one DHCP entry. If
716 we switch powerdns to use its strict LDAP method (ldap-method=strict
717 in pdns-debian-edu.conf), the forward and reverse DNS entries are
718 merged into one while making it impossible to transfer the reverse map
719 to a slave DNS server.
</p>
721 <p>If we also replace the object class used to get the DNS related
722 attributes to one allowing these attributes to be combined with the
723 dhcphost object class, we can merge the DNS and DHCP entries into one.
724 I've written such object class in the dnsdomainaux.schema file (need
725 proper OIDs, but that is a minor issue), and tested the setup. It
728 <p>With this test setup in place, we can get away with one LDAP object
729 for both DNS and DHCP, and even the LTSP configuration I suggested in
730 an earlier email. The combined LDAP object will look something like
734 dn: cn=hostname,cn=group1,cn=THINCLIENTS,cn=DHCP Config,dc=skole,dc=skolelinux,dc=no
736 objectClass: dhcphost
737 objectclass: domainrelatedobject
738 objectclass: dnsdomainaux
739 associateddomain: hostname.intern
741 dhcphwaddress: ethernet
00:
00:
00:
00:
00:
00
742 dhcpstatements: fixed-address hostname
746 <p>The DNS server uses the associateddomain and arecord entries, while
747 the DHCP server uses the dhcphwaddress and dhcpstatements entries
748 before asking DNS to resolve the fixed-adddress. LTSP will use
749 dhcphwaddress or associateddomain and the ldapconfig* attributes.
</p>
751 <p>I am not yet sure if I can get the DHCP server to look for its
752 dhcphost in a different location, to allow us to put the objects
753 outside the "DHCP Config" subtree, but hope to figure out a way to do
754 that. If I can't figure out a way to do that, we can still get rid of
755 the hosts subtree and move all its content into the DHCP Config tree
756 (which probably should be renamed to be more related to the new
757 content. I suspect cn=dnsdhcp,ou=services or something like that
758 might be a good place to put it.
</p>
760 <p>If you want to help out with implementing this for Debian Edu,
761 please contact us on debian-edu@lists.debian.org.
</p>
767 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>.
771 <div class=
"padding"></div>
774 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Idea_for_storing_LTSP_configuration_in_LDAP.html">Idea for storing LTSP configuration in LDAP
</a></div>
775 <div class=
"date">2010-
07-
11 22:
00</div>
777 <p>Vagrant mentioned on IRC today that ltsp_config now support
778 sourcing files from /usr/share/ltsp/ltsp_config.d/ on the thin
779 clients, and that this can be used to fetch configuration from LDAP if
780 Debian Edu choose to store configuration there.
</p>
782 <p>Armed with this information, I got inspired and wrote a test module
783 to get configuration from LDAP. The idea is to look up the MAC
784 address of the client in LDAP, and look for attributes on the form
785 ltspconfigsetting=value, and use this to export SETTING=value to the
788 <p>The goal is to be able to store the LTSP configuration attributes
789 in a "computer" LDAP object used by both DNS and DHCP, and thus
790 allowing us to store all information about a computer in one place.
</p>
792 <p>This is a untested draft implementation, and I welcome feedback on
793 this approach. A real LDAP schema for the ltspClientAux objectclass
794 need to be written. Comments, suggestions, etc?
</p>
797 # Store in /opt/ltsp/$arch/usr/share/ltsp/ltsp_config.d/ldap-config
799 # Fetch LTSP client settings from LDAP based on MAC address
801 # Uses ethernet address as stored in the dhcpHost objectclass using
802 # the dhcpHWAddress attribute or ethernet address stored in the
803 # ieee802Device objectclass with the macAddress attribute.
805 # This module is written to be schema agnostic, and only depend on the
806 # existence of attribute names.
808 # The LTSP configuration variables are saved directly using a
809 # ltspConfig prefix and uppercasing the rest of the attribute name.
810 # To set the SERVER variable, set the ltspConfigServer attribute.
812 # Some LDAP schema should be created with all the relevant
813 # configuration settings. Something like this should work:
815 # objectclass (
1.1.2.2 NAME 'ltspClientAux'
818 # MAY ( ltspConfigServer $ ltsConfigSound $ ... )
820 LDAPSERVER=$(debian-edu-ldapserver)
821 if [ "$LDAPSERVER" ] ; then
822 LDAPBASE=$(debian-edu-ldapserver -b)
823 for MAC in $(LANG=C ifconfig |grep -i hwaddr| awk '{print $
5}'|sort -u) ; do
824 filter="(|(dhcpHWAddress=ethernet $MAC)(macAddress=$MAC))"
825 ldapsearch -h "$LDAPSERVER" -b "$LDAPBASE" -v -x "$filter" | \
826 grep '^ltspConfig' | while read attr value ; do
827 # Remove prefix and convert to upper case
828 attr=$(echo $attr | sed 's/^ltspConfig//i' | tr a-z A-Z)
829 # bass value on to clients
830 eval "$attr=$value; export $attr"
836 <p>I'm not sure this shell construction will work, because I suspect
837 the while block might end up in a subshell causing the variables set
838 there to not show up in ltsp-config, but if that is the case I am sure
839 the code can be restructured to make sure the variables are passed on.
840 I expect that can be solved with some testing. :)
</p>
842 <p>If you want to help out with implementing this for Debian Edu,
843 please contact us on debian-edu@lists.debian.org.
</p>
845 <p>Update
2010-
07-
17: I am aware of another effort to store LTSP
846 configuration in LDAP that was created around year
2000 by
847 <a href=
"http://www.pcxperience.com/thinclient/documentation/ldap.html">PC
848 Xperience, Inc.,
2000</a>. I found its
849 <a href=
"http://people.redhat.com/alikins/ltsp/ldap/">files
</a> on a
850 personal home page over at redhat.com.
</p>
856 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>.
860 <div class=
"padding"></div>
863 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/jXplorer__a_very_nice_LDAP_GUI.html">jXplorer, a very nice LDAP GUI
</a></div>
864 <div class=
"date">2010-
07-
09 12:
55</div>
867 <a href=
"http://people.skolelinux.org/pere/blog/LUMA__a_very_nice_LDAP_GUI.html">my
868 last post
</a> about available LDAP tools in Debian, I was told about a
869 LDAP GUI that is even better than luma. The java application
870 <a href=
"http://jxplorer.org/">jXplorer
</a> is claimed to be capable of
871 moving LDAP objects and subtrees using drag-and-drop, and can
872 authenticate using Kerberos. I have only tested the Kerberos
873 authentication, but do not have a LDAP setup allowing me to rewrite
874 LDAP with my test user yet. It is
875 <a href=
"http://packages.qa.debian.org/j/jxplorer.html">available in
876 Debian
</a> testing and unstable at the moment. The only problem I
877 have with it is how it handle errors. If something go wrong, its
878 non-intuitive behaviour require me to go through some query work list
879 and remove the failing query. Nothing big, but very annoying.
</p>
885 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>.
889 <div class=
"padding"></div>
891 <p style=
"text-align: right;"><a href=
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"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
1)
</a></li>
1016 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
10)
</a></li>
1018 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
1)
</a></li>
1020 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
7)
</a></li>
1026 <p style=
"text-align: right">
1027 Created by
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