CentOS 7/RHEL7: How To synchronize System Time Using Ntpdate service
How to adjust the system time to a accurate time using the ntpdate command under centos7/6.5 or RHEL 7/6.5 linux? How can I synchronize system time to a accurate time? this post will show you how to use ntpdate command to adjust system time to sync with remote time ntp server.
CentOS 7 synchronize system time using ntpdate command
Firstly you need to check if ntpdate package is installed currently. issue the following command:
rpm -qa | grep ntpdate
outputs:
[root@devops /]# rpm -qa | grep ntpdate ntpdate-4.2.6p5-18.el7.centos.x86_64
If it is not installed, running the below “yum install” command to install it,type:
yum install ntpdate
outputs:
[root@devops /]# yum install ntpdate
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.btte.net
* extras: mirrors.btte.net
* updates: mirrors.yun-idc.com
Resolving Dependencies
--> Running transaction check
---> Package ntpdate.x86_64 0:4.2.6p5-19.el7.centos will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
ntpdate x86_64 4.2.6p5-19.el7.centos updates 82 k
Transaction Summary
================================================================================
Install 1 Package
Total size: 82 k
Installed size: 121 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
anaconda-19.31.79-1.el7.centos.4.x86_64 has missing requires of ntpdate
ntp-4.2.6p5-18.el7.centos.x86_64 has missing requires of ntpdate = ('0', '4.2.6p5', '18.el7.centos')
Installing : ntpdate-4.2.6p5-19.el7.centos.x86_64 1/1
Verifying : ntpdate-4.2.6p5-19.el7.centos.x86_64 1/1
Installed:
ntpdate.x86_64 0:4.2.6p5-19.el7.centos
Complete!
After installed ntpdate package, you now can use ntpdate command to synchronize system time from the remote ntp time server, issue the following command:
ntpdate pool.ntp.org
outputs:
[root@devops /]# ntpdate pool.ntp.org 22 Dec 04:33:10 ntpdate[3836]: adjust time server 97.107.128.58 offset -0.034519 se
