chrony軟件使用說明

chrony軟件使用說明

1、chrony簡介

  chrony是一個開源的自由軟件，它能保持系統時鐘與時間服務器（ntp）同步，

  讓時間保持精確。

  它由兩個程序組成：chrongd和chronyc。

  chronyd是一個後臺運行的守護進程，用於調整內核運行的系統時鐘和時間服務器同步。

  它肯定計算機增減時間的比率，並對此進行補償。

  chrony是CentOs7.x上自帶的時間同步軟件

2、chrony的操做

#yum install -y chrony -->安裝服務

#systemctl start chronyd.service -->啓動服務

#systemctl enable chronyd.service -->設置開機自自動，默認是enable

3、chrony配置文件

chrony服務使用的配置文件爲/etc/chrony.conf

其配置內容格式和ntpd服務基本類似

[root@chrony ~]# vim /etc/chrony.conf

 

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

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

#server 0.centos.pool.ntp.org iburst

#server 1.centos.pool.ntp.org iburst

#server 2.centos.pool.ntp.org iburst

#server 3.centos.pool.ntp.org iburst

 server ntp1.aliyun.com       iburst

# 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 192.168.56.0/24

 

# 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