Chronyd
chronyd是一個同步系統時鍾的守護進程。
從Centos7開始默認安裝時鍾同步服務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
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
Timedatectl
Query or change system time and date settings.
set-timezone
設置時區，也可以手動執行localtime軟連接
# timedatectl set-timezone Asia/Shanghai
# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
set-ntp BOOL
和chrony配置的ntp server進行時間同步
set-time TIME
手動設置日期時間