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f874424cab
Move network services to /lib/services. Move init-functions to /lib/lsb. Make /lib/lsb a symlink to /lib/services. Create convenience symlink /etc/init.d->/etc/rc.d/init.d Add help and man pages to ifup/ifdown. Append /run/var/bootlog to /var/log/boot.log at the end of the boot sequence. Add capability to step through the boot scripts at boot time. Optionally allow environment variables in sysconfig directory's console, network, and clock files to be placed in rc.site. Add an optional FASTBOOT parameter to set /fastboot when rebooting. Remove a minor warning message from udev that is triggered by the udev_retry boot script. Add SKIPTMPCLEAN as an optional parameter to skip cleaning /tmp at boot time. Add a page to Chapter 7 documenting rc.site. git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9597 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
69 lines
2.9 KiB
XML
69 lines
2.9 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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<note><para>The CLOCKPARAMS and UTC paramaters may be alternatively set
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in the <filename>/etc/sysconfig/rc.site</filename> file.</para></note>
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</sect1>
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