blog/archive/2012/01/index.html

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   6     <title>Petter Reinholdtsen: entries from January 2012</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     <h3>Entries from January 2012.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/Fixing_an_hanging_debian_installer_for_Debian_Edu.html">Fixing an hanging debian installer for Debian Edu</a>
  27       </div>
  28       <div class="date">
  29          3rd January 2012
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  31       <div class="body">
  32         <p>During christmas, I have been working getting the next version of
  33 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> ready
  34 for release.  The initial problem I looked at was particularly
  35 interesting.</p>
  36
  37 <P>The installer would hang at the end when it was doing it
  38 post-installation configuration, and whatevery I did to try to find
  39 the cause and fix it always worked while I tested it, but never when I
  40 integrated it into the installer and ran the installation from
  41 scratch.  I would try to restart processes, close file descriptors,
  42 remove or create files, and the installer would always unblock and
  43 wrap up its tasks.</p>
  44
  45 <p>Eventually the cause was found.  The kernel was simply running out
  46 of entropy, causing the Kerberos setup to hang waiting for more.
  47 Pressing keys was adding entropy to the kernel, and thus all my tries
  48 to fix the problem worked not because what I was typing to fix it, but
  49 because I was typing.</P>
  50
  51 <p>The fix I implemented was to add a background process looking at
  52 the level of entropy in the kernel (by checking
  53 /proc/sys/kernel/random/entropy_avail), and if it was too small, the
  54 installer will flush the kernel file buffers and do 'find /' to
  55 generate some disk IO.  Disk IO generate entropy in the kernel, and is
  56 one of the few things that can be initated from within the system to
  57 generate entropy.</p>
  58
  59 <p>The fix is in
  60 <a href="http://wiki.debian.org/DebianEdu/Documentation/Squeeze/Installation">beta1
  61 of the Debian Edu/Squeeze</a> version, and we
  62 <a href="http://wiki.debian.org/DebianEdu">welcome more testers and
  63 developers</a>.  We plan to release beta2 this weekend.</p>
  64
  65       </div>
  66       <div class="tags">
  67
  68
  69         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>.
  70
  71
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  76     <div class="entry">
  77       <div class="title">
  78         <a href="http://people.skolelinux.org/pere/blog/Second_beta_version_of_Debian_Edu___Skolelinux_based_on_Squeeze.html">Second beta version of Debian Edu / Skolelinux based on Squeeze</a>
  79       </div>
  80       <div class="date">
  81          7th January 2012
  82       </div>
  83       <div class="body">
  84         <p>I am happy to announce that today we managed to wrap up and publish
  85 the second beta version of
  86 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a>.  If
  87 you want to test a LDAP backed Kerberos server with out of the box PXE
  88 configuration for running diskless machines and installing new
  89 machines, check it out.  If you need a software solution for your
  90 school, check it out too.  The full announcement is
  91 <a href="http://lists.debian.org/debian-edu-announce/2012/01/msg00000.html">available</a>
  92 on the project announcement list.</p>
  93
  94       </div>
  95       <div class="tags">
  96
  97
  98         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>.
  99
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 101       </div>
 102     </div>
 103     <div class="padding"></div>
 104
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 106     <div id="sidebar">
 107
 108
 109
 110 <h2>Archive</h2>
 111 <ul>
 112
 113 <li>2012
 114 <ul>
 115
 116 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (2)</a></li>
 117
 118 </ul></li>
 119
 120 <li>2011
 121 <ul>
 122
 123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 132
 133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 134
 135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 136
 137 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 138
 139 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 140
 141 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 142
 143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 144
 145 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 146
 147 </ul></li>
 148
 149 <li>2010
 150 <ul>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 161
 162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 163
 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 165
 166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 167
 168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 173
 174 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 175
 176 </ul></li>
 177
 178 <li>2009
 179 <ul>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 190
 191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 192
 193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 194
 195 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 200
 201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 202
 203 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 204
 205 </ul></li>
 206
 207 <li>2008
 208 <ul>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 213
 214 </ul></li>
 215
 216 </ul>
 217
 218
 219
 220 <h2>Tags</h2>
 221 <ul>
 222
 223  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 224
 225  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 226
 227  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 228
 229  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (2)</a></li>
 230
 231  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
 232
 233  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 234
 235  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (54)</a></li>
 236
 237  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (66)</a></li>
 238
 239  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (7)</a></li>
 240
 241  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (100)</a></li>
 242
 243  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (13)</a></li>
 244
 245  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 246
 247  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (11)</a></li>
 248
 249  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (15)</a></li>
 250
 251  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
 252
 253  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (4)</a></li>
 254
 255  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 256
 257  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (14)</a></li>
 258
 259  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (141)</a></li>
 260
 261  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (119)</a></li>
 262
 263  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 264
 265  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (24)</a></li>
 266
 267  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (46)</a></li>
 268
 269  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 270
 271  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
 272
 273  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (4)</a></li>
 274
 275  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 276
 277  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (23)</a></li>
 278
 279  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (3)</a></li>
 280
 281  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (24)</a></li>
 282
 283  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (1)</a></li>
 284
 285  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (3)</a></li>
 286
 287  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (9)</a></li>
 288
 289  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (6)</a></li>
 290
 291  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (22)</a></li>
 292
 293  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (1)</a></li>
 294
 295  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (17)</a></li>
 296
 297 </ul>
 298
 299
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