source: clfs-sysroot/BOOK/bootscripts/common/setclock.xml @ 755f44a

Last change on this file since 755f44a was 755f44a, checked in by Joe Ciccone <jciccone@…>, 13 years ago

LFS to CLFS changes.

  • Property mode set to 100644
File size: 2.4 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-scripts-setclock">
9  <?dbhtml filename="setclock.html"?>
10
11  <title>Configuring the setclock Script</title>
12
13  <indexterm zone="ch-scripts-setclock">
14    <primary sortas="d-setclock">setclock</primary>
15  <secondary>configuring</secondary></indexterm>
16
17  <para os="a">The <command>setclock</command> script reads the time from the
18  hardware clock, also known as the BIOS or the Complementary Metal Oxide
19  Semiconductor (CMOS) clock. If the hardware clock is set to UTC, this
20  script will convert the hardware clock's time to the local time using
21  the <filename>/etc/localtime</filename> file (which tells the
22  <command>hwclock</command> program which timezone the user is in). There
23  is no way to detect whether or not the hardware clock is set to UTC, so
24  this needs to be configured manually.</para>
25
26  <para os="b">If you cannot remember whether or not the hardware clock is set
27  to UTC, find out by running the <userinput>hwclock --localtime
28  --show</userinput> command. This will display what the current time is
29  according to the hardware clock. If this time matches whatever your
30  watch says, then the hardware clock is set to local time. If the output
31  from <command>hwclock</command> is not local time, chances are it is set
32  to UTC time. Verify this by adding or subtracting the proper amount of
33  hours for the timezone to the time shown by <command>hwclock</command>.
34  For example, if you are currently in the MST timezone, which is also
35  known as GMT -0700, add seven hours to the local time.</para>
36
37  <para os="c">Change the value of the <envar>UTC</envar> variable below
38  to a value of <option>0</option> (zero) if the hardware clock
39  is <emphasis>not</emphasis> set to UTC time.</para>
40
41  <para os="d">Create a new file <filename>/etc/sysconfig/clock</filename> by running
42  the following:</para>
43
44<screen><userinput>cat &gt; ${CLFS}/etc/sysconfig/clock &lt;&lt; "EOF"
45<literal># Begin /etc/sysconfig/clock
46
47UTC=1
48
49# End /etc/sysconfig/clock</literal>
50EOF</userinput></screen>
51
52  <para os="e">A good hint explaining how to deal with time on CLFS is available
53  at <ulink url="&hints-root;time.txt"/>. It explains issues such as
54  time zones, UTC, and the <envar>TZ</envar> environment variable.</para>
55
56</sect1>
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