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<title> 7.5. Configuring the system clock </title>
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<body class="lfs" id="lfs-7.7-systemd">
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<div class="navheader">
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<h4> Linux From Scratch - Version 7.7-systemd </h4>
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<h3> 第 7 章. 基本系统配置 </h3>
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<ul>
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<li class="prev"> <a accesskey="p" href="symlinks.html"
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title="Creating Custom Symlinks to Devices">上一页</a>
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<p> 创建自定义符号连接设备 </p>
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</li>
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<li class="next"> <a accesskey="n" href="console.html"
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title="Configuring the Linux Console">下一页</a>
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<p> Configuring the Linux Console </p>
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</li>
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<li class="up"> <a accesskey="u" href="chapter07.html"
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title="Chapter 7. Basic System Configuration">返回</a>
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title="Linux From Scratch - Version 7.7-systemd">主页</a> </li>
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</ul>
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</div>
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<div class="sect1" xml:lang="en" lang="en">
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<h1 class="sect1"> <a id="ch-scripts-clock"
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name="ch-scripts-clock"></a>7.5. 配置系统时间 </h1>
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<p> 本节将会讨论如何配置 <span class="command"><strong>systemd-timedated</strong></span>
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系统服务，包括配置系统时间和时区。</p>
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<p> 如果你不确定是否将硬件时钟设置为 UTC，可以通过 <strong class="userinput"><code>hwclock
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--localtime --show</code></strong>
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来查看。这将根据硬件时钟显示当前的时间。如果实现和手表的时间相同，应该是设置为本地时间了；如果时间不一致，应该是设置为 UTC
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了。通过增减数小时，可以确定你所在时区。</p>
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<p> <span class="command"><strong>systemd-timedated</strong></span>
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读取 <code class="filename">/etc/adjtime</code>，且取决于该文件的内容是本地时间还是
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UTC。</p>
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<p> <br>
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如果想要将硬件时钟设置为本地时间，使用以下命令建立 <code class="filename">/etc/adjtime </code>：</p>
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<pre class="userinput"><kbd class="command">cat > /etc/adjtime << "EOF"
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<code class="literal">0.0 0 0.0
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0
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LOCAL</code>
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EOF</kbd>
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</pre>
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<p> If <code class="filename">/etc/adjtime</code> isn't present
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at first boot, <span class="command"><strong>systemd-timedated</strong></span>
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will assume that hardware clock is set to UTC and adjust the
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file according to that. </p>
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<p> You can also use the <span class="command"><strong>timedatectl</strong></span>
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utility to tell <span class="command"><strong>systemd-timedated</strong></span>
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if your hardware clock is set to UTC or local time: </p>
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<pre class="userinput"><kbd class="command">timedatectl set-local-rtc 1</kbd>
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</pre>
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<p> <span class="command"><strong>timedatectl</strong></span> can
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also be used to change system time and time zone. </p>
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<p> To change your current system time, issue: </p>
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<pre class="userinput"><kbd class="command">timedatectl set-time YYYY-MM-DD HH:MM:SS</kbd>
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</pre>
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<p> Hardware clock will also be updated accordingly. </p>
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<p> To change your current time zone, issue: </p>
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<pre class="userinput"><kbd class="command">timedatectl set-timezone TIMEZONE</kbd>
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</pre>
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<p> You can get list of available time zones by running: </p>
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<pre class="userinput"><kbd class="command">timedatectl list-timezones</kbd>
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</pre>
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<div class="admon note"> <img alt="[Note]"
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src="../images/note.png">
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<h3> Note </h3>
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<p> Please note that <span class="command"><strong>timedatectl</strong></span>
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command can be used only on a system booted with systemd. </p>
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</div>
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<div class="sect2" xml:lang="en" lang="en">
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<h2 class="sect2"> 7.5.1. 网络时间同步</h2>
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<p> 从版本号 213 的 systemd 开始，包括了一个名为<strong> </strong><span
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class="command"><strong>systemd-timesyncd</strong></span>
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的守护进程，将能够和远程的 NTP 服务器同步时间。 </p>
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<p> 此守护进程并不是为了取代已有的 NTP 服务，而是作为 SNTP
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协议的实现客户端，它可用于更高级的任务和资源有限的系统。</p>
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<p> 从版本号 216 的 systemd 开始，<span class="command"><strong>systemd-timesyncd</strong></span>
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守护进程默认启用，如果需要禁用，执行以下命令：</p>
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<pre class="userinput"><kbd class="command">systemctl disable systemd-timesyncd</kbd>
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</pre>
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<p> <code class="filename">/etc/systemd/timesyncd.conf</code>
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文件也可以通过<strong> </strong><span class="command"><strong>systemd-timesyncd</strong></span>
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同步来更改 NTP 服务。</p>
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<p> 需要注意的是，当使用本地时间作为系统时间时，<span class="command"><strong>systemd-timesyncd</strong></span>
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无法更新硬件时钟。 </p>
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</div>
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</div>
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<div class="navfooter">
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<ul>
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<li class="prev"> <a accesskey="p" href="symlinks.html"
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title="Creating Custom Symlinks to Devices">上一页</a>
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<p> 创建自定义符号连接设备 </p>
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</li>
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<li class="next"> <a accesskey="n" href="console.html"
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title="Configuring the Linux Console">下一页</a>
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<p> Configuring the Linux Console </p>
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</li>
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<li class="up"> <a accesskey="u" href="chapter07.html"
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title="Chapter 7. Basic System Configuration">返回</a>
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</li>
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<li class="home"> <a accesskey="h" href="../index.html"
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title="Linux From Scratch - Version 7.7-systemd">主页</a> </li>
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</ul>
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</div>
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</body>
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</html>
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