[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[673b0d8] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[d781ffb] | 7 |
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[3be4d97] | 8 | <sect1 id="ch-scripts-setclock">
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[d781ffb] | 9 | <?dbhtml filename="setclock.html"?>
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| 10 |
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| 11 | <title>Configuring the setclock Script</title>
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| 12 |
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| 13 | <indexterm zone="ch-scripts-setclock">
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| 14 | <primary sortas="d-setclock">setclock</primary>
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| 15 | <secondary>configuring</secondary></indexterm>
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| 16 |
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| 17 | <para>The <command>setclock</command> script reads the time from the hardware
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| 18 | clock, also known as the BIOS or the Complementary Metal Oxide Semiconductor
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| 19 | (CMOS) clock. If the hardware clock is set to UTC, this script will convert the
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| 20 | hardware clock's time to the local time using the
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| 21 | <filename>/etc/localtime</filename> file (which tells the
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| 22 | <command>hwclock</command> program which timezone the user is in). There is no
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| 23 | way to detect whether or not the hardware clock is set to UTC, so this
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| 24 | needs to be configured manually.</para>
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| 25 |
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[63f6e21] | 26 | <para>The <command>setclock</command> is run via
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| 27 | <application>udev</application> when the kernel detects the hardware
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| 28 | capability upon boot. It can also be run manually with the stop parameter to
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| 29 | store the system time to the CMOS clock.</para>
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| 30 |
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[d781ffb] | 31 | <para>If you cannot remember whether or not the hardware clock is set to UTC,
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| 32 | find out by running the <userinput>hwclock --localtime --show</userinput>
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| 33 | command. This will display what the current time is according to the hardware
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| 34 | clock. If this time matches whatever your watch says, then the hardware clock is
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| 35 | set to local time. If the output from <command>hwclock</command> is not local
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| 36 | time, chances are it is set to UTC time. Verify this by adding or subtracting
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| 37 | the proper amount of hours for the timezone to the time shown by
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| 38 | <command>hwclock</command>. For example, if you are currently in the MST
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| 39 | timezone, which is also known as GMT -0700, add seven hours to the local
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| 40 | time.</para>
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| 41 |
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| 42 | <para>Change the value of the <envar>UTC</envar> variable below
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| 43 | to a value of <parameter>0</parameter> (zero) if the hardware clock
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| 44 | is <emphasis>not</emphasis> set to UTC time.</para>
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| 45 |
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| 46 | <para>Create a new file <filename>/etc/sysconfig/clock</filename> by running
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| 47 | the following:</para>
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[6370fa6] | 48 |
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[f67f5cf] | 49 | <screen><userinput>cat > /etc/sysconfig/clock << "EOF"
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[d72e04a] | 50 | <literal># Begin /etc/sysconfig/clock
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[6370fa6] | 51 |
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[56cc653] | 52 | UTC=1
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[6370fa6] | 53 |
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[2ca8941] | 54 | # Set this to any options you might need to give to hwclock,
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[63f6e21] | 55 | # such as machine hardware clock type for Alphas.
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| 56 | CLOCKPARAMS=
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| 57 |
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[d72e04a] | 58 | # End /etc/sysconfig/clock</literal>
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[f67f5cf] | 59 | EOF</userinput></screen>
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[6370fa6] | 60 |
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[d781ffb] | 61 | <para>A good hint explaining how to deal with time on LFS is available
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| 62 | at <ulink url="&hints-root;time.txt"/>. It explains issues such as
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| 63 | time zones, UTC, and the <envar>TZ</envar> environment variable.</para>
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[81fd230] | 64 |
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[0cda898] | 65 | <note><para>The CLOCKPARAMS and UTC paramaters may be alternatively set
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[f874424] | 66 | in the <filename>/etc/sysconfig/rc.site</filename> file.</para></note>
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[0cda898] | 67 |
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[6370fa6] | 68 | </sect1>
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