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authorPierre Labastie <pieere@linuxfromscratch.org>2019-03-08 13:52:17 +0000
committerPierre Labastie <pieere@linuxfromscratch.org>2019-03-08 13:52:17 +0000
commit39fecacfaf2cc18abd0045f40c5da19bb040c3cd (patch)
tree27b5f66808461763666e475aaa62ce25a07fc087 /chapter07/setclock.xml
parentf0db4f6c3de41fb29b45d9538565f4f043cf7372 (diff)
Remove obsolete pages from the chapter07 directory:
Those have been included into "usage.xml" or obsoleted for a long time now, and just clobber the sources. git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11551 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
- <!ENTITY % general-entities SYSTEM "../general.ent">
- %general-entities;
-]>
-
-<sect1 id="ch-scripts-clock">
- <?dbhtml filename="clock.html"?>
-
- <title>Configuring the System Clock</title>
-
- <para>Procedures for setting the system clock differ between systemd and
- System V, however the separate procedures do not conflict so both
- procedures should be accomplished to allow switching between systems.</para>
-
- <sect2 id="ch-scripts-setclock">
- <title>System V Clock Configuration</title>
-
- <indexterm zone="ch-scripts-setclock">
- <primary sortas="d-setclock">setclock</primary>
- <secondary>configuring</secondary></indexterm>
-
- <para>The <command>setclock</command> script reads the time from the hardware
- clock, also known as the BIOS or the Complementary Metal Oxide Semiconductor
- (CMOS) clock. If the hardware clock is set to UTC, this script will convert the
- hardware clock's time to the local time using the
- <filename>/etc/localtime</filename> file (which tells the
- <command>hwclock</command> program which timezone the user is in). There is no
- way to detect whether or not the hardware clock is set to UTC, so this
- needs to be configured manually.</para>
-
- <para>The <command>setclock</command> is run via
- <application>udev</application> when the kernel detects the hardware
- capability upon boot. It can also be run manually with the stop parameter to
- store the system time to the CMOS clock.</para>
-
- <para>If you cannot remember whether or not the hardware clock is set to UTC,
- find out by running the <userinput>hwclock --localtime --show</userinput>
- command. This will display what the current time is according to the hardware
- clock. If this time matches whatever your watch says, then the hardware clock is
- set to local time. If the output from <command>hwclock</command> is not local
- time, chances are it is set to UTC time. Verify this by adding or subtracting
- the proper amount of hours for the timezone to the time shown by
- <command>hwclock</command>. For example, if you are currently in the MST
- timezone, which is also known as GMT -0700, add seven hours to the local
- time.</para>
-
- <para>Change the value of the <envar>UTC</envar> variable below
- to a value of <parameter>0</parameter> (zero) if the hardware clock
- is <emphasis>not</emphasis> set to UTC time.</para>
-
- <para>Create a new file <filename>/etc/sysconfig/clock</filename> by running
- the following:</para>
-
-<screen><userinput>cat &gt; /etc/sysconfig/clock &lt;&lt; "EOF"
-<literal># Begin /etc/sysconfig/clock
-
-UTC=1
-
-# Set this to any options you might need to give to hwclock,
-# such as machine hardware clock type for Alphas.
-CLOCKPARAMS=
-
-# End /etc/sysconfig/clock</literal>
-EOF</userinput></screen>
-
- <para>A good hint explaining how to deal with time on LFS is available
- at <ulink url="&hints-root;time.txt"/>. It explains issues such as
- time zones, UTC, and the <envar>TZ</envar> environment variable.</para>
-
- <note><para>The CLOCKPARAMS and UTC paramaters may be alternatively set
- in the <filename>/etc/sysconfig/rc.site</filename> file.</para></note>
-
- </sect2>
-
- <sect2 id="ch-scripts-systemd-clock">
- <title>Systemd Clock Configuration</title>
-
- <indexterm zone="ch-scripts-clock">
- <primary sortas="d-clock">clock</primary>
- <secondary>configuring</secondary></indexterm>
-
- <para>This section discusses how to configure the
- <command>systemd-timedated</command> system service, which configures
- system clock and timezone.</para>
-
- <para><command>systemd-timedated</command> reads
- <filename>/etc/adjtime</filename>, and depending on the contents of the file,
- it sets the clock to either UTC or local time. Create the
- <filename>/etc/adjtime</filename> file with the following contents <emphasis>if your
- hardware clock is set to local time</emphasis>:</para>
-
-<screen role="nodump"><userinput>cat &gt; /etc/adjtime &lt;&lt; "EOF"
-<literal>0.0 0 0.0
-0
-LOCAL</literal>
-EOF</userinput></screen>
-
- <para>If <filename>/etc/adjtime</filename> isn't present at first boot,
- <command>systemd-timedated</command> will assume that hardware clock is
- set to UTC and create the file using that setting.</para>
-
- <para>You can also use the <command>timedatectl</command> utility to tell
- <command>systemd-timedated</command> if your hardware clock is set to
- UTC or local time:</para>
-
-<screen role="nodump"><userinput>timedatectl set-local-rtc 1</userinput></screen>
-
- <para><command>timedatectl</command> can also be used to change system time and
- time zone.</para>
-
- <para>To change your current system time, issue:</para>
-
-<screen role="nodump"><userinput>timedatectl set-time YYYY:MM:DD HH:MM:SS</userinput></screen>
-
- <para>Hardware clock will also be updated accordingly.</para>
-
- <para>To change your current time zone, issue:</para>
-
-<screen role="nodump"><userinput>timedatectl set-timezone TIMEZONE</userinput></screen>
-
- <para>You can get list of available time zones by running:</para>
-
-<screen role="nodump"><userinput>timedatectl list-timezones</userinput></screen>
-
- <note><para>Please note that <command>timedatectl</command> command can
- be used only on a system booted with Systemd.</para></note>
-
- </sect2>
-
-</sect1>