Centos 7.4 server time synchronization configuration method [based on NTP service]

This article describes how to configure time synchronization on a CentOS 7.4 server. Share with you for your reference, the details are as follows:

1. Install NTP server using yum

#yum -y install ntp

2. Start the ntp service

#systemctl start ntpd

3. Set the system to start automatically

#systemctl enable ntpd

4. Modify the startup parameters and add -g -x parameters to allow the ntp service to work normally even when the system time error is large

#vi /etc/sysconfig/ntpd
OPTIONS="-g -x"

5. Read the current time

#timedatectl

6. Set the time zone to Asia/Shanghai

#timedatectl set-timezone Asia/Shanghai

7. Enable NTP server synchronization

#timedatectl set-ntp yes

8. Check the server time. If it is still out of sync, manually sync the server time.

#/usr/sbin/ntpdate ntp.api.bz

The error "the NTP socket is in use, exiting" appears.
8 Nov 09:57:02 ntpdate[4726]:the NTP socket is in use, exiting

9. The reason for this error is that the system ntpd server is running. By checking with ps aux | grep ntpd, you can see that ntpd is running.

Solution:

#systemctl stop ntpd 
#/usr/sbin/ntpdate ntp.api.bz

10. Last viewed time

#timedatectl

I hope this article will help you configure your CentOS server.