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6 <title>Petter Reinholdtsen: Fixing an hanging debian installer for Debian Edu</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">Fixing an hanging debian installer for Debian Edu</div>
24 <div class="date"> 3rd January 2012</div>
25 <div class="body"><p>During christmas, I have been working getting the next version of
26 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> ready
27 for release. The initial problem I looked at was particularly
28 interesting.</p>
29
30 <P>The installer would hang at the end when it was doing it
31 post-installation configuration, and whatevery I did to try to find
32 the cause and fix it always worked while I tested it, but never when I
33 integrated it into the installer and ran the installation from
34 scratch. I would try to restart processes, close file descriptors,
35 remove or create files, and the installer would always unblock and
36 wrap up its tasks.</p>
37
38 <p>Eventually the cause was found. The kernel was simply running out
39 of entropy, causing the Kerberos setup to hang waiting for more.
40 Pressing keys was adding entropy to the kernel, and thus all my tries
41 to fix the problem worked not because what I was typing to fix it, but
42 because I was typing.</P>
43
44 <p>The fix I implemented was to add a background process looking at
45 the level of entropy in the kernel (by checking
46 /proc/sys/kernel/random/entropy_avail), and if it was too small, the
47 installer will flush the kernel file buffers and do 'find /' to
48 generate some disk IO. Disk IO generate entropy in the kernel, and is
49 one of the few things that can be initated from within the system to
50 generate entropy.</p>
51
52 <p>The fix is in
53 <a href="http://wiki.debian.org/DebianEdu/Documentation/Squeeze/Installation">beta1
54 of the Debian Edu/Squeeze</a> version, and we
55 <a href="http://wiki.debian.org/DebianEdu">welcome more testers and
56 developers</a>. We plan to release beta2 this weekend.</p>
57 </div>
58
59 <div class="tags">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>.</div>
60
61
62 </div>
63
64
65
66
67 <div id="sidebar">
68
69
70
71 <h2>Archive</h2>
72 <ul>
73
74 <li>2017
75 <ul>
76
77 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
78
79 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
80
81 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
82
83 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
84
85 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (2)</a></li>
86
87 </ul></li>
88
89 <li>2016
90 <ul>
91
92 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
93
94 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
95
96 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
97
98 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
99
100 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
101
102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
103
104 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
105
106 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
107
108 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
109
110 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
111
112 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
113
114 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
115
116 </ul></li>
117
118 <li>2015
119 <ul>
120
121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
122
123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
124
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128
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130
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132
133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
134
135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
136
137 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
138
139 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
140
141 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
142
143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
144
145 </ul></li>
146
147 <li>2014
148 <ul>
149
150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
151
152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
153
154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
155
156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
157
158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
159
160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
161
162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
163
164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
165
166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
167
168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
169
170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
171
172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
173
174 </ul></li>
175
176 <li>2013
177 <ul>
178
179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
180
181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
182
183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
184
185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
186
187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
188
189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
190
191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
192
193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
194
195 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
196
197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
198
199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
200
201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
202
203 </ul></li>
204
205 <li>2012
206 <ul>
207
208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
209
210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
211
212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
213
214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
215
216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
217
218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
219
220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
221
222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
223
224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
225
226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
227
228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
229
230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
231
232 </ul></li>
233
234 <li>2011
235 <ul>
236
237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
238
239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
240
241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
242
243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
244
245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
246
247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
248
249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
250
251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
252
253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
254
255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
256
257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
258
259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
260
261 </ul></li>
262
263 <li>2010
264 <ul>
265
266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
267
268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
269
270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
271
272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
273
274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
275
276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
277
278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
279
280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
281
282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
283
284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
285
286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
287
288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
289
290 </ul></li>
291
292 <li>2009
293 <ul>
294
295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
296
297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
298
299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
300
301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
302
303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
304
305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
306
307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
308
309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
310
311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
312
313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
314
315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
316
317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
318
319 </ul></li>
320
321 <li>2008
322 <ul>
323
324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
325
326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
327
328 </ul></li>
329
330 </ul>
331
332
333
334 <h2>Tags</h2>
335 <ul>
336
337 <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
338
339 <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
340
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342
343 <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
344
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346
347 <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
348
349 <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
350
351 <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
352
353 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (149)</a></li>
354
355 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
356
357 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (3)</a></li>
358
359 <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
360
361 <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (16)</a></li>
362
363 <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (23)</a></li>
364
365 <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
366
367 <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (347)</a></li>
368
369 <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
370
371 <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
372
373 <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (29)</a></li>
374
375 <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
376
377 <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
378
379 <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
380
381 <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
382
383 <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (15)</a></li>
384
385 <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
386
387 <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
388
389 <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
390
391 <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
392
393 <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
394
395 <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
396
397 <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
398
399 <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (9)</a></li>
400
401 <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (290)</a></li>
402
403 <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (188)</a></li>
404
405 <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (32)</a></li>
406
407 <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
408
409 <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (64)</a></li>
410
411 <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (99)</a></li>
412
413 <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
414
415 <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
416
417 <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
418
419 <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
420
421 <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
422
423 <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
424
425 <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
426
427 <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
428
429 <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (52)</a></li>
430
431 <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
432
433 <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
434
435 <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (54)</a></li>
436
437 <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
438
439 <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (11)</a></li>
440
441 <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (48)</a></li>
442
443 <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (3)</a></li>
444
445 <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
446
447 <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (8)</a></li>
448
449 <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
450
451 <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
452
453 <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
454
455 </ul>
456
457
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