</div>
<div class="padding"></div>
+ <div class="entry">
+ <div class="title">
+ <a href="http://people.skolelinux.org/pere/blog/Saving_power_with_Debian_Edu___Skolelinux_using_shutdown_at_night.html">Saving power with Debian Edu / Skolelinux using shutdown-at-night</a>
+ </div>
+ <div class="date">
+ 5th February 2012
+ </div>
+ <div class="body">
+ <p>Since the Lenny version of
+<a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a>, a
+feature to save power have been included. It is as simple as it is
+practical: Shut down unused clients at night, and turn them on again
+in the morning. This is done using the
+<a href="http://packages.qa.debian.org/s/shutdown-at-night.html">shutdown-at-night</a> Debian package.</p>
+
+<p>To enable this feature on a client, the machine need to be added to
+the netgroup shutdown-at-night-hosts. For Debian Edu, This is done in
+LDAP, and once this is in place, the machine in question will check
+every hour from 16:00 until 06:00 to see if the machine is unused, and
+shut it down if it is. If the hardware in question is supported by
+the
+<a href="http://packages.qa.debian.org/n/nvram-wakeup.html">nvram-wakeup</a>
+package, the BIOS is told to turn the machine back on around 07:00 +-
+10 minutes. If this isn't working, one can configure wake-on-lan to
+try to turn on the client. The wake-on-lan option is only documented
+and not enabled by default in Debian Edu.</p>
+
+<p>It is important to not turn all machines on at once, as this can
+blow a fuse if several computers are connected to the same fuse like
+the common setup for a classroom. The nvram-wakeup method only work
+for machines with a functioning hardware/BIOS clock. I've seen old
+machines where the BIOS battery were dead and the hardware clock were
+starting from 0 (or was it 1990?) every boot. If you have one of
+those, you have to turn on the computer manually.</p>
+
+<p>The shutdown-at-night package is completely self contained, and can
+also be used outside the Debian Edu environment. For those without a
+central LDAP server with netgroups, one can instead touch the file
+<tt>/etc/shutdown-at-night/shutdown-at-night</tt> to enable it.
+Perhaps you too can use it to save some power?</p>
+
+ </div>
+ <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>
+ </div>
+ <div class="padding"></div>
+
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<div id="sidebar">
<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
-<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (1)</a></li>
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (2)</a></li>
</ul></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (54)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (72)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (73)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (7)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (104)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (105)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (13)</a></li>
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