X-Git-Url: https://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/969227bd70d2c8e4c690edd88aeb308199f77db8..4670db8c493b13f0e5943bbd89757deb459a997a:/blog/archive/2012/02/02.rss

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@@ -59,5 +59,45 @@ will see you there?</p>
 </description>
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+	<item>
+		<title>Saving power with Debian Edu / Skolelinux using shutdown-at-night</title>
+		<link>http://people.skolelinux.org/pere/blog/Saving_power_with_Debian_Edu___Skolelinux_using_shutdown_at_night.html</link>        
+		<guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Saving_power_with_Debian_Edu___Skolelinux_using_shutdown_at_night.html</guid>
+                <pubDate>Sun, 5 Feb 2012 09:45:00 +0100</pubDate>
+		<description>&lt;p&gt;Since the Lenny version of
+&lt;a href=&quot;http://www.skolelinux.org/&quot;&gt;Debian Edu / Skolelinux&lt;/a&gt;, 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
+&lt;a href=&quot;http://packages.qa.debian.org/s/shutdown-at-night.html&quot;&gt;shutdown-at-night&lt;/a&gt; Debian package.&lt;/p&gt;
+
+&lt;p&gt;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
+&lt;a href=&quot;http://packages.qa.debian.org/n/nvram-wakeup.html&quot;&gt;nvram-wakeup&lt;/a&gt;
+package, the BIOS is told to turn the machine back on around 07:00 +-
+10 minutes.  If this isn&#39;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.&lt;/p&gt;
+
+&lt;p&gt;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&#39;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.&lt;/p&gt;
+
+&lt;p&gt;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
+&lt;tt&gt;/etc/shutdown-at-night/shutdown-at-night&lt;/tt&gt; to enable it.
+Perhaps you too can use it to save some power?&lt;/p&gt;
+</description>
+	</item>
+	
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