【学习笔记】NTP时间同步验证

chronyd服务作为服务器：

检查chronyd服务（Ubuntu默认）sudo systemctl status chronyd

查看chronyd是否开机自启 sudo systemctl is-enabled chronyd

配置文件：sudo vim /etc/chrony/chrony.conf

添加允许客户端同步规则：

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allow 192.168.0.1/24  # 替换为设备所在的网段或具体IP

查看防火墙开放端口：sudo ufw status 一般时间同步为123端口

开放端口： sudo ufw allow 123/udp sudo ufw reload

服务器上查看有哪些客户端连接NTP服务器：192.168.0.9目前正是主控systemd-timesyncd正在连接

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$ sudo chronyc clients
Hostname                      NTP   Drop Int IntL Last     Cmd   Drop Int  Last
===============================================================================
localhost                       0      0   -   -     -       2      0   8   529
192.168.0.9                     6      0   7   -    47       0      0   -     -

systemd-timesyncd作为客户端：

systemd-timesyncd是否开启：sudo systemctl status systemd-timesyncd

开启服务：sudo systemctl start systemd-timesyncd

开机自启动：sudo systemctl enable systemd-timesyncd

开启同步功能：sudo timedatectl set-ntp true

查看同步时间有没有开启：timedatectl status

时钟服务配置文件路径 /etc/systemd/timesyncd.conf：

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[Time]
NTP=0.debian.pool.ntp.org   #NTP时钟服务器地址，域名或IP均可

查看同步日志：sudo journalctl -u systemd-timesyncd

说明同步成功：

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~# sudo journalctl -u systemd-timesyncd
-- Logs begin at Tue 2025-08-05 20:49:46 CST, end at Tue 2025-08-05 21:18:55 CST. --
Aug 05 21:02:10 novastar systemd-timesyncd[22776]: Synchronized to time server 203.107.6.88:123 (ntp.aliyun.com).
Aug 05 21:11:51 novastar systemd-timesyncd[11626]: Synchronized to time server 192.168.0.10:123 (192.168.0.10).
Aug 05 21:13:39 novastar systemd-timesyncd[15592]: Synchronized to time server 192.168.0.10:123 (192.168.0.10).