參考資料

Linux - CentOS7上的時間同步 https://www.cnblogs.com/zhubiao/p/9768209.html

配置Linux例項Chrony服務（CentOS 7） https://help.aliyun.com/document_detail/187016.html?spm=a2c4g.11186623.2.23.54b829c59fG0tc

正文

執行以下命令修改時區
[[email protected] ~]# ln -sf /usr/share/zoneinfo/Asia/Hong-Kong /etc/localtime
執行以下命令更新硬體時鐘（RTC）
[[email protected]

# Use Alibaba NTP server
# Public NTP
# Alicloud NTP


server ntp.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp1.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp1.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp10.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp11.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp12.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp2.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp2.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp3.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp3.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp4.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp4.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp5.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp5.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp6.aliyun.com minpoll 4 maxpoll 10 iburst
server ntp6.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp7.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp8.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst
server ntp9.cloud.aliyuncs.com minpoll 4 maxpoll 10 iburst

# Ignore stratum in source selection.
stratumweight 0.05

# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Enable kernel RTC synchronization.
rtcsync

# In first three updates step the system clock instead of slew
# if the adjustment is larger than 10 seconds.
makestep 10 3

# Allow NTP client access from local network.
#allow 192.168/16

# Listen for commands only on localhost.
bindcmdaddress 127.0.0.1
bindcmdaddress ::1

# Disable logging of client accesses.
noclientlog

# Send a message to syslog if a clock adjustment is larger than 0.5 seconds.
logchange 0.5

logdir /var/log/chrony
#log measurements statistics tracking
 

執行以下命令啟動chronyd服務並設定開機自啟動。
[[email protected] ~]# systemctl start chronyd.service
[[email protected] ~]# systemctl enable chronyd.service
執行以下命令檢視本機時間同步狀態，用於驗證服務是否已啟動。
[[email protected] ~]# chronyc tracking
執行以下命令檢視時間同步伺服器列表。
[[email protected] ~]# chronyc -n sources -v

使用Chrony手動同步時鐘