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63f6e21758
Removed aio device from udev configuration so defaults are used. git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8902 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
66 lines
2.8 KiB
XML
66 lines
2.8 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-scripts-setclock">
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<?dbhtml filename="setclock.html"?>
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<title>Configuring the setclock Script</title>
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<indexterm zone="ch-scripts-setclock">
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<primary sortas="d-setclock">setclock</primary>
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<secondary>configuring</secondary></indexterm>
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<para>The <command>setclock</command> script reads the time from the hardware
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clock, also known as the BIOS or the Complementary Metal Oxide Semiconductor
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(CMOS) clock. If the hardware clock is set to UTC, this script will convert the
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hardware clock's time to the local time using the
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<filename>/etc/localtime</filename> file (which tells the
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<command>hwclock</command> program which timezone the user is in). There is no
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way to detect whether or not the hardware clock is set to UTC, so this
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needs to be configured manually.</para>
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<para>The <command>setclock</command> is run via
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<application>udev</application> when the kernel detects the hardware
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capability upon boot. It can also be run manually with the stop parameter to
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store the system time to the CMOS clock.</para>
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<para>If you cannot remember whether or not the hardware clock is set to UTC,
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find out by running the <userinput>hwclock --localtime --show</userinput>
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command. This will display what the current time is according to the hardware
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clock. If this time matches whatever your watch says, then the hardware clock is
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set to local time. If the output from <command>hwclock</command> is not local
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time, chances are it is set to UTC time. Verify this by adding or subtracting
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the proper amount of hours for the timezone to the time shown by
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<command>hwclock</command>. For example, if you are currently in the MST
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timezone, which is also known as GMT -0700, add seven hours to the local
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time.</para>
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<para>Change the value of the <envar>UTC</envar> variable below
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to a value of <parameter>0</parameter> (zero) if the hardware clock
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is <emphasis>not</emphasis> set to UTC time.</para>
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<para>Create a new file <filename>/etc/sysconfig/clock</filename> by running
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the following:</para>
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<screen><userinput>cat > /etc/sysconfig/clock << "EOF"
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<literal># Begin /etc/sysconfig/clock
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UTC=1
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# Set this to any options you might need to give to hwclock,
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# such as machine hardware clock type for Alphas.
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CLOCKPARAMS=
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# End /etc/sysconfig/clock</literal>
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EOF</userinput></screen>
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<para>A good hint explaining how to deal with time on LFS is available
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at <ulink url="&hints-root;time.txt"/>. It explains issues such as
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time zones, UTC, and the <envar>TZ</envar> environment variable.</para>
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</sect1>
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