Centos7 使用 chronyd 进行时钟同步

谁践踏了优雅 2022-10-18 00:56 467阅读 0赞

背景

最近要做阿里云迁移 IDC 机房，整理下 Linux 运维基线，简单记录，以备后用~

安装

# 默认已经安装
    $ yum install -y chrony

配置文件

$ cat /etc/chrony.conf
    # Use public servers from the pool.ntp.org project.
    # Please consider joining the pool (http://www.pool.ntp.org/join.html).
    # 国家服务器
    server 0.cn.pool.ntp.org
    server 1.cn.pool.ntp.org
    server 2.cn.pool.ntp.org
    server 3.cn.pool.ntp.org
    # 阿里
    server ntp.aliyun.com
    # 腾讯
    server time1.cloud.tencent.com
    server time2.cloud.tencent.com
    server time3.cloud.tencent.com
    server time4.cloud.tencent.com
    server time5.cloud.tencent.com
    # 苹果
    server time.asia.apple.com
    # 微软
    server time.windows.com
    # 其他
    server cn.ntp.org.cn
    
    # Record the rate at which the system clock gains/losses time.
    driftfile /var/lib/chrony/drift
    
    # Allow the system clock to be stepped in the first three updates
    # if its offset is larger than 1 second.
    makestep 1.0 3
    
    # Enable kernel synchronization of the real-time clock (RTC).
    rtcsync
    
    # Enable hardware timestamping on all interfaces that support it.
    #hwtimestamp *
    
    # Increase the minimum number of selectable sources required to adjust
    # the system clock.
    #minsources 2
    
    # Allow NTP client access from local network.
    #allow 192.168.0.0/16
    
    # Serve time even if not synchronized to a time source.
    #local stratum 10
    
    # Specify file containing keys for NTP authentication.
    #keyfile /etc/chrony.keys
    
    # Specify directory for log files.
    logdir /var/log/chrony
    
    # Select which information is logged.
    #log measurements statistics tracking

启动服务及时区设置

# 启动服务
    $ systemctl start chronyd
    
    # 开机启动
    $ systemctl enable chronyd
    
    # 查看当前状态
    $ systemctl status chronyd
    
    # 查看亚洲时区
    $ timedatectl list-timezones | grep Asia
    
    # 设置时区
    $ timedatectl set-timezone Asia/Shanghai

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTA3OTc3_size_16_color_FFFFFF_t_70]  
验证服务

# 查看现有的时间服务器
    $ chronyc sources -v
    
    # 查看时间服务器状态
    $ chronyc sourcestats -v
    
    # 显示时钟同步相关参数
    $ chronyc tracking
    
    # 查看当前时区及时间
    $ timedatectl

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTA3OTc3_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][20210604115543743.png]  
手动同步时间

# 使用 ntpdate 同步时间
    $ ntpdate ntp.aliyun.com
    
    # chronyd 未启动时，如下命令同步时间
    $ chronyd -q 'server pool.ntp.org iburst'
    
    # chronyd 启动时，使用如下命令同步时间
    $ chronyc -a 'burst 4/4' && sleep 10 && chronyc -a makestep

![在这里插入图片描述][20210604115705581.png]  
手动设置时间

# date 设置时间
    $ date -s '2021-06-03 19:00:00'
    
    # 关闭 ntp 同步后，才可以使用 timedatectl 进行时间设置
    $ timedatectl set-ntp false
    
    # 设置日期和时间
    $ timedatectl set-time '2021-06-03 19:00:00'
    
    # 设置日期
    $ timedatectl set-time '2021-06-03'
    
    # 设置时间
    $ timedatectl set-time '19:00:00'
    
    # 设置完成后，再开启
    $ timedatectl set-ntp true

参考

*  https://access.redhat.com/documentation/en-us/red\_hat\_enterprise\_linux/7/html/system\_administrators\_guide/ch-configuring\_ntp\_using\_the\_chrony\_suite
 *  https://chrony.tuxfamily.org/comparison.html

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTA3OTc3_size_16_color_FFFFFF_t_70]: /images/20221014/a7899457923e4c28b2a260b69bff54a5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTA3OTc3_size_16_color_FFFFFF_t_70 1]: /images/20221014/7f69348929f445689c0c7b284f4d1a74.png
[20210604115543743.png]: /images/20221014/d7fa8f93cd5d45f198676f3317a07c93.png
[20210604115705581.png]: /images/20221014/8e84f81d895b4cddaad50668927cd2cf.png