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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>2018
75 <ul>
76
77 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
78
79 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (4)</a></li>
80
81 </ul></li>
82
83 <li>2017
84 <ul>
85
86 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
87
88 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
89
90 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
91
92 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
93
94 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
95
96 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
97
98 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
99
100 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
101
102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
103
104 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
105
106 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
107
108 </ul></li>
109
110 <li>2016
111 <ul>
112
113 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
114
115 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
116
117 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
118
119 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
120
121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
122
123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
124
125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
126
127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
128
129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
130
131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
132
133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
134
135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
136
137 </ul></li>
138
139 <li>2015
140 <ul>
141
142 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
143
144 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
145
146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
147
148 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
149
150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
151
152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
153
154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
155
156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
157
158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
159
160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
161
162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
163
164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
165
166 </ul></li>
167
168 <li>2014
169 <ul>
170
171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
172
173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
174
175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
176
177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
178
179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
180
181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
182
183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
184
185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
186
187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
188
189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
190
191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
192
193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
194
195 </ul></li>
196
197 <li>2013
198 <ul>
199
200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
201
202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
203
204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
205
206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
207
208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
209
210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
211
212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
213
214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
215
216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
217
218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
219
220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
221
222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
223
224 </ul></li>
225
226 <li>2012
227 <ul>
228
229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
230
231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
232
233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
234
235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
236
237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
238
239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
240
241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
242
243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
244
245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
246
247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
248
249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
250
251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
252
253 </ul></li>
254
255 <li>2011
256 <ul>
257
258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
259
260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
261
262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
263
264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
265
266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
267
268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
269
270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
271
272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
273
274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
275
276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
277
278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
279
280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
281
282 </ul></li>
283
284 <li>2010
285 <ul>
286
287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
288
289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
290
291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
292
293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
294
295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
296
297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
298
299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
300
301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
302
303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
304
305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
306
307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
308
309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
310
311 </ul></li>
312
313 <li>2009
314 <ul>
315
316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
317
318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
319
320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
321
322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
323
324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
325
326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
327
328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
329
330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
331
332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
333
334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
335
336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
337
338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
339
340 </ul></li>
341
342 <li>2008
343 <ul>
344
345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
346
347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
348
349 </ul></li>
350
351 </ul>
352
353
354
355 <h2>Tags</h2>
356 <ul>
357
358 <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
359
360 <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
361
362 <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
363
364 <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
365
366 <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
367
368 <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
369
370 <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
371
372 <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
373
374 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (156)</a></li>
375
376 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
377
378 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
379
380 <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
381
382 <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
383
384 <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (24)</a></li>
385
386 <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
387
388 <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (367)</a></li>
389
390 <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
391
392 <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
393
394 <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
395
396 <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
397
398 <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
399
400 <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
401
402 <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
403
404 <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (15)</a></li>
405
406 <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
407
408 <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
409
410 <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
411
412 <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
413
414 <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
415
416 <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
417
418 <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
419
420 <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
421
422 <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (9)</a></li>
423
424 <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (295)</a></li>
425
426 <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (190)</a></li>
427
428 <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
429
430 <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
431
432 <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (71)</a></li>
433
434 <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (104)</a></li>
435
436 <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
437
438 <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
439
440 <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
441
442 <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
443
444 <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
445
446 <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
447
448 <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
449
450 <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
451
452 <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
453
454 <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
455
456 <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
457
458 <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
459
460 <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
461
462 <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
463
464 <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (53)</a></li>
465
466 <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
467
468 <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
469
470 <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
471
472 <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (11)</a></li>
473
474 <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (62)</a></li>
475
476 <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
477
478 <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
479
480 </ul>
481
482
483 </div>
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