How to set chrony when the time shifts in CentOS7

How to set chrony when the time shifts in CentOS7

――What is chrony?

NTP client installed as standard in CentOS 7(Up to CentOS6, ntpd was installed)
There are differences, but
chrony :Useful in environments where constant communication with the NTP server is not possible, such as virtual impressions
ntp :Useful in an environment where you can always communicate with the NTP server

chrony settings


$ sudo yum install chrony
Loaded plugin:fastestmirror
Loading mirror speeds from cached hostfile
 * base:
 * extras:
 * updates:
Package chrony-3.4-1.el7.x86_64 is installed or latest version
Do nothing

It is installed by default and seems to be the latest version.

--Change configuration file

$ sudo vi /etc/chrony.conf 
#Comment out
#server iburst
#server iburst
#server iburst
#server iburst

#add to
server iburst
server iburst 

--Restarting chrony

$ sudo systemctl restart chronyd

--Synchronization confirmation

$ chronyc sources
210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
^-          2   6    17     7  -1686us[-1785us] +/-   61ms
^*                1   6    17     7    -84us[ -183us] +/-   10ms

^ represents the server - is an acceptable server * Is the server currently in sync

--Check the time

$ date
Tuesday, September 1, 2020 21:00:25 JST


-Using CHRONY -[Linux] Time synchronization setting and operation procedure by Chrony [Chronyd] -I adjusted the time dilation with CentOS 7

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