CentOS 7配置NTP客户端
<p>保持服务器时间准确，对于业务系统的运行、数据库中时间的记录等至关重要。通常的做法是为服务器配置NTP客户端服务，让服务器自己定时去与NTP服务器同步时间。</p><p>以CentOS 7服务器为例，为期配置NTP客户端的具体步骤如下：</p>
<p><strong>一、查看本机时间，确定NTP服务器的可用性</strong>（本例中以东北大学NTP服务器ntp.neu.edu.cn为例）</p>
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<pre class="brush:csharp;gutter:true;"># date //查看本机时间
# ntpdate ntp.neu.edu.cn//确认NTP服务器的可用性
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<p><img src="https://img2020.cnblogs.com/blog/1960974/202007/1960974-20200711234637264-403879950.png"></p>
<p> </p>
<p><strong>二、配置NTP客户端</strong></p>
<p>编辑ntp.conf文件，为NTP客户端配置NTP服务器的地址ntp.neu.edu.cn</p>
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<pre class="brush:csharp;gutter:true;">// 编辑NTP配置文件
# vim /etc/ntp.conf
// 注释配置文件中原有的NTP服务器，并在其中添加自己所需的NTP服务器地址
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
# server 0.centos.pool.ntp.org iburst
# server 1.centos.pool.ntp.org iburst
# server 2.centos.pool.ntp.org iburst
# server 3.centos.pool.ntp.org iburst
server ntp.neu.edu.cn iburst
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<p> </p>
<p><strong>三、将NTP配置为（自启动）服务，并启动运行</strong></p>
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<pre class="brush:csharp;gutter:true;"># systemctl enable ntpd.service//安装为服务
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
# systemctl start ntpd//启动运行
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<p> </p>
<p><strong>四、检查NTP客户端运行状态</strong></p>
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<pre class="brush:csharp;gutter:true;"># systemctl status ntpd
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<p><img src="https://img2020.cnblogs.com/blog/1960974/202007/1960974-20200712001152334-625650365.png"> </p>
<p> </p>
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<pre class="brush:csharp;gutter:true;"># ntpstat
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<p><img src="https://img2020.cnblogs.com/blog/1960974/202007/1960974-20200712001139700-1671735004.png"></p>
<p> </p>
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<pre class="brush:csharp;gutter:true;"># watch ntpq -p
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<p><img src="https://img2020.cnblogs.com/blog/1960974/202007/1960974-20200712001334350-385971944.png"></p>
<p>ctrl+c 退出NTP监视器</p>
<p> </p>
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<pre class="brush:csharp;gutter:true;"># ntpdate ntp.neu.edu.cn
12 Jul 00:14:46 ntpdate: the NTP socket is in use, exiting //提示NTP socket已经被使用
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<p> </p>
<p> </p><br><br>
来源：https://www.cnblogs.com/yangjisen/p/13286278.html
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