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author | Bruce Dubbs <bdubbs@linuxfromscratch.org> | 2020-06-07 20:16:00 +0000 |
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committer | Bruce Dubbs <bdubbs@linuxfromscratch.org> | 2020-06-07 20:16:00 +0000 |
commit | fcc027677da55c41dcaea045f5b9ff8b088e6495 (patch) | |
tree | 42500a7858959695b971e7f28f1d0bf33185db2e /chapter07/clock.xml | |
parent | d53fefab5a6772fef606392a61608fc290e6a7ae (diff) |
Initial commit of alternative cross LFS
git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11897 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter07/clock.xml')
-rw-r--r-- | chapter07/clock.xml | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/chapter07/clock.xml b/chapter07/clock.xml deleted file mode 100644 index 872ba677c..000000000 --- a/chapter07/clock.xml +++ /dev/null @@ -1,104 +0,0 @@ -<?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-config-clock" revision="systemd"> - <?dbhtml filename="clock.html"?> - - <title>Configuring the system clock</title> - - <indexterm zone="ch-config-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>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><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.</para> - - <para>Create the <filename>/etc/adjtime</filename> file with the following contents - if your hardware clock is set to local time:</para> - -<screen><userinput>cat > /etc/adjtime << "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 adjust the file according to that.</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 a list of available time zones by running:</para> - -<screen role="nodump"><userinput>timedatectl list-timezones</userinput></screen> - - <note><para>Please note that the <command>timedatectl</command> command can - be used only on a system booted with systemd.</para></note> - - <sect2> - <title>Network Time Synchronization</title> - - <para>Starting with version 213, systemd ships a daemon called - <command>systemd-timesyncd</command> which can be used to - synchronize the system time with remote NTP servers.</para> - - <para>The daemon is not intended as a replacement for the well - established NTP daemon, but as a client only implementation - of the SNTP protocol which can be used for less advanced - tasks and on resource limited systems.</para> - - <para>Starting with systemd version 216, the - <command>systemd-timesyncd</command> daemon is enabled by - default. If you want to disable it, issue the following - command:</para> - -<screen role="nodump"><userinput>systemctl disable systemd-timesyncd</userinput></screen> - - <para>The <filename>/etc/systemd/timesyncd.conf</filename> file - can be used to change the NTP servers that - <command>systemd-timesyncd</command> synchronizes with.</para> - - <para>Please note that when system clock is set to Local Time, - <command>systemd-timesyncd</command> won't update hardware - clock.</para> - - </sect2> - -</sect1> |