chronyd是一个同步系统时钟的守护进程。
从Centos7开始默认安装时钟同步服务chronyd，而不是ntpd。
# dnf -y install chronyd # eccho ‘server ntp1.aliyun.com iburst‘ >> /etc/chrony.conf # systemctl enable chronyd.service && systemctl start chronyd.service
chronyc is a command-line interface program which can be used to monitor chronyd’s performance and to change various operating parameters whilst it is running.
# chronyc sources -v .-- Source mode ‘^‘ = server, ‘=‘ = peer, ‘#‘ = local clock. / .- Source state ‘*‘ = current synced, ‘+‘ = combined , ‘-‘ = not combined, | / ‘?‘ = unreachable, ‘x‘ = time may be in error, ‘~‘ = time too variable. || .- xxxx [ yyyy ] +/- zzzz || Reachability register (octal) -. | xxxx = adjusted offset, || Log2(Polling interval) --. | | yyyy = measured offset, || \ | | zzzz = estimated error. || | | MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^* classroom.example.com 8 10 377 1000 +130us[ +147us] +/- 819us
Query or change system time and date settings.
设置时区，也可以手动执行localtime软连接
# timedatectl set-timezone Asia/Shanghai
# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
和chrony配置的ntp server进行时间同步
手动设置日期时间
原文：https://www.cnblogs.com/vincenshen/p/12441451.html