1. 检查NTP服务端

systemctl status ntpd

2. 检查NTP客户端配置

cat /etc/ntp.conf

cat /etc/chrony/chrony.conf

3. 检查NTP服务是否安装

dpkg -l | grep ntp

dpkg -l | grep chrony

rpm -qa | grep ntp

rpm -qa | grep chrony

4. 检查NTP服务是否运行（通用方法）

ps aux | grep ntpd

ps aux | grep chronyd

• 启动服务：systemctl start ntpd 或 systemctl start chronyd
• 停止服务：systemctl stop ntpd 或 systemctl stop chronyd
• 重启服务：systemctl restart ntpd 或 systemctl restart chronyd
• 启用服务开机自启：systemctl enable ntpd 或 systemctl enable chronyd
• 禁用服务开机自启：systemctl disable ntpd 或 systemctl disable chronyd