安装

# 默认已经安装

$ yum install -y chrony

配置文件

$ cat /etc/chrony.conf

# Use public servers from the pool.ntp.org project.

# Please consider joining the pool (http://www.pool.ntp.org/join.html).

# 国家服务器

server 0.cn.pool.ntp.org

server 1.cn.pool.ntp.org

server 2.cn.pool.ntp.org

server 3.cn.pool.ntp.org

# 阿里

server ntp.aliyun.com

# 腾讯

server time1.cloud.tencent.com

server time2.cloud.tencent.com

server time3.cloud.tencent.com

server time4.cloud.tencent.com

server time5.cloud.tencent.com

# 苹果

server time.asia.apple.com

# 微软

server time.windows.com

# 其他

server cn.ntp.org.cn

# Record the rate at which the system clock gains/losses time.

driftfile /var/lib/chrony/drift

# Allow the system clock to be stepped in the first three updates

# if its offset is larger than 1 second.

makestep 1.0 3

# Enable kernel synchronization of the real-time clock (RTC).

rtcsync

# Enable hardware timestamping on all interfaces that support it.

#hwtimestamp *

# Increase the minimum number of selectable sources required to adjust

# the system clock.

#minsources 2

# Allow NTP client access from local network.

#allow 192.168.0.0/16

# Serve time even if not synchronized to a time source.

#local stratum 10

# Specify file containing keys for NTP authentication.

#keyfile /etc/chrony.keys

# Specify directory for log files.

logdir /var/log/chrony

# Select which information is logged.

#log measurements statistics tracking

启动服务及时区设置

# 启动服务

$ systemctl start chronyd

# 开机启动

$ systemctl enable chronyd

# 查看当前状态

$ systemctl status chronyd

# 查看亚洲时区

$ timedatectl list-timezones | grep Asia

# 设置时区

$ timedatectl set-timezone Asia/Shanghai

验证服务

# 查看现有的时间服务器

$ chronyc sources -v

# 查看时间服务器状态

$ chronyc sourcestats -v

# 显示时钟同步相关参数

$ chronyc tracking

# 查看当前时区及时间

$ timedatectl 

手动同步时间

# 使用 ntpdate 同步时间

$ ntpdate ntp.aliyun.com

# chronyd 未启动时，如下命令同步时间

$ chronyd -q 'server pool.ntp.org iburst'

# chronyd 启动时，使用如下命令同步时间

$ chronyc -a 'burst 4/4' && sleep 10 && chronyc -a makestep

手动设置时间

# date 设置时间

$ date -s '2021-06-03 19:00:00'

# 关闭 ntp 同步后，才可以使用 timedatectl 进行时间设置

$ timedatectl set-ntp false

# 设置日期和时间

$ timedatectl set-time '2021-06-03 19:00:00'

# 设置日期

$ timedatectl set-time '2021-06-03'

# 设置时间

$ timedatectl set-time '19:00:00'

# 设置完成后，再开启

$ timedatectl set-ntp true

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