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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
  30       </div>
  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
  72       </div>
  73     </div>
  74     <div class="padding"></div>
  75
  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
 100
 101       </div>
 102     </div>
 103     <div class="padding"></div>
 104
 105     <div class="entry">
 106       <div class="title">
 107         <a href="http://people.skolelinux.org/pere/blog/Changing_the_default_Iceweasel_start_page_in_Debian_Edu_Squeeze.html">Changing the default Iceweasel start page in Debian Edu/Squeeze</a>
 108       </div>
 109       <div class="date">
 110         10th January 2012
 111       </div>
 112       <div class="body">
 113         <p>In the Squeeze version of
 114 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> soon
 115 to be released, users of the system will get their default browser
 116 start page set from LDAP, allowing the system administrator to point
 117 all users to the school web page by updating one setting in LDAP.  In
 118 addition to setting the default start page when a machine boots, users
 119 are shown the same page as a welcome page when they log in for the
 120 first time.</p>
 121
 122 <p>The LDAP object dc=skole,dc=skolelinux,dc=no have an attribute
 123 labeledURI with "http://www/ LDAP for Debian Edu/Skolelinux" as the
 124 default content.  By changing this value to another URL, all users get
 125 to see the page behind this new URL.</p>
 126
 127 <p>An easy way to update it is by using the ldapvi tool.  It can be
 128 called as "<tt>ldapvi -ZD '(cn=admin)'</tt>' to update LDAP with the
 129 new setting.</p>
 130
 131 <p>We have written the code to adjust the default start page and show
 132 the welcome page, and I wonder if there is an easier way to do this
 133 from within Iceweasel instead.</p>
 134
 135       </div>
 136       <div class="tags">
 137
 138
 139         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/web">web</a>.
 140
 141
 142       </div>
 143     </div>
 144     <div class="padding"></div>
 145
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 147     <div id="sidebar">
 148
 149
 150
 151 <h2>Archive</h2>
 152 <ul>
 153
 154 <li>2012
 155 <ul>
 156
 157 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (3)</a></li>
 158
 159 </ul></li>
 160
 161 <li>2011
 162 <ul>
 163
 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 165
 166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 167
 168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 173
 174 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 175
 176 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 177
 178 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 179
 180 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 181
 182 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 183
 184 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 185
 186 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 187
 188 </ul></li>
 189
 190 <li>2010
 191 <ul>
 192
 193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 194
 195 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 200
 201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 202
 203 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 204
 205 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 206
 207 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 208
 209 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 210
 211 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 212
 213 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 214
 215 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 216
 217 </ul></li>
 218
 219 <li>2009
 220 <ul>
 221
 222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 223
 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 229
 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 231
 232 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 233
 234 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 235
 236 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 237
 238 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 239
 240 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 241
 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 243
 244 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 245
 246 </ul></li>
 247
 248 <li>2008
 249 <ul>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 254
 255 </ul></li>
 256
 257 </ul>
 258
 259
 260
 261 <h2>Tags</h2>
 262 <ul>
 263
 264  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 265
 266  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 267
 268  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 269
 270  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (2)</a></li>
 271
 272  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
 273
 274  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 275
 276  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (54)</a></li>
 277
 278  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (67)</a></li>
 279
 280  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (7)</a></li>
 281
 282  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (101)</a></li>
 283
 284  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (13)</a></li>
 285
 286  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 287
 288  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (11)</a></li>
 289
 290  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (15)</a></li>
 291
 292  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
 293
 294  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (4)</a></li>
 295
 296  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 297
 298  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (14)</a></li>
 299
 300  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (141)</a></li>
 301
 302  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (119)</a></li>
 303
 304  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 305
 306  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (24)</a></li>
 307
 308  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (46)</a></li>
 309
 310  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 311
 312  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
 313
 314  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (4)</a></li>
 315
 316  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 317
 318  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (23)</a></li>
 319
 320  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (3)</a></li>
 321
 322  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (24)</a></li>
 323
 324  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (1)</a></li>
 325
 326  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (3)</a></li>
 327
 328  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (9)</a></li>
 329
 330  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (6)</a></li>
 331
 332  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (22)</a></li>
 333
 334  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (1)</a></li>
 335
 336  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (18)</a></li>
 337
 338 </ul>
 339
 340
 341     </div>
 342     <p style="text-align: right">
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