blog/Saving_power_with_Debian_Edu___Skolelinux_using_shutdown_at_night.html

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   6     <title>Petter Reinholdtsen: Saving power with Debian Edu / Skolelinux using shutdown-at-night</title>
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  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
  16
  17 </div>
  18
  19
  20     <div class="entry">
  21       <div class="title">Saving power with Debian Edu / Skolelinux using shutdown-at-night</div>
  22       <div class="date"> 5th February 2012</div>
  23       <div class="body"><p>Since the Lenny version of
  24 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a>, a
  25 feature to save power have been included.  It is as simple as it is
  26 practical: Shut down unused clients at night, and turn them on again
  27 in the morning.  This is done using the
  28 <a href="http://packages.qa.debian.org/s/shutdown-at-night.html">shutdown-at-night</a> Debian package.</p>
  29
  30 <p>To enable this feature on a client, the machine need to be added to
  31 the netgroup shutdown-at-night-hosts.  For Debian Edu, this is done in
  32 LDAP, and once this is in place, the machine in question will check
  33 every hour from 16:00 until 06:00 to see if the machine is unused, and
  34 shut it down if it is.  If the hardware in question is supported by
  35 the
  36 <a href="http://packages.qa.debian.org/n/nvram-wakeup.html">nvram-wakeup</a>
  37 package, the BIOS is told to turn the machine back on around 07:00 +-
  38 10 minutes.  If this isn't working, one can configure wake-on-lan to
  39 try to turn on the client.  The wake-on-lan option is only documented
  40 and not enabled by default in Debian Edu.</p>
  41
  42 <p>It is important to not turn all machines on at once, as this can
  43 blow a fuse if several computers are connected to the same fuse like
  44 the common setup for a classroom.  The nvram-wakeup method only work
  45 for machines with a functioning hardware/BIOS clock.  I've seen old
  46 machines where the BIOS battery were dead and the hardware clock were
  47 starting from 0 (or was it 1990?) every boot.  If you have one of
  48 those, you have to turn on the computer manually.</p>
  49
  50 <p>The shutdown-at-night package is completely self contained, and can
  51 also be used outside the Debian Edu environment.  For those without a
  52 central LDAP server with netgroups, one can instead touch the file
  53 <tt>/etc/shutdown-at-night/shutdown-at-night</tt> to enable it.
  54 Perhaps you too can use it to save some power?</p>
  55 </div>
  56
  57       <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>
  58
  59
  60     </div>
  61
  62
  63
  64
  65     <div id="sidebar">
  66
  67
  68
  69 <h2>Archive</h2>
  70 <ul>
  71
  72 <li>2012
  73 <ul>
  74
  75 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
  76
  77 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
  78
  79 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
  80
  81 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
  82
  83 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
  84
  85 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (6)</a></li>
  86
  87 </ul></li>
  88
  89 <li>2011
  90 <ul>
  91
  92 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
  93
  94 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
  95
  96 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
  97
  98 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
  99
 100 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 101
 102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 103
 104 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 105
 106 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 107
 108 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 109
 110 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 111
 112 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 113
 114 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 115
 116 </ul></li>
 117
 118 <li>2010
 119 <ul>
 120
 121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 122
 123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 132
 133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 134
 135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 136
 137 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 138
 139 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 140
 141 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 142
 143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 144
 145 </ul></li>
 146
 147 <li>2009
 148 <ul>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 161
 162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 163
 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 165
 166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 167
 168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 173
 174 </ul></li>
 175
 176 <li>2008
 177 <ul>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 182
 183 </ul></li>
 184
 185 </ul>
 186
 187
 188
 189 <h2>Tags</h2>
 190 <ul>
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 192  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
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 203
 204  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (54)</a></li>
 205
 206  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (103)</a></li>
 207
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 235
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 237
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 239
 240  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 241
 242  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
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 261
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 263
 264  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (10)</a></li>
 265
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 267
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 271
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 273
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