Linux Time Sync With Time Server

Ubuntu

$ sudo ntpdate pool.ntp.org
31 Aug 19:05:55 ntpdate[8911]: the NTP socket is in use, exiting
$ sudo service ntp stop
[ ok ] Stopping NTP server: ntpd.
$ sudo ntpdate pool.ntp.org
31 Aug 19:07:11 ntpdate[10355]: adjust time server 46.29.176.115 offset -0.002893 sec
$ sudo service ntp start

If ntp daemon is running, basically you don’t need to do ntpdate. The ntp daemon cares about it.

CentOS

$ sudo rdate -s ntp.jst.mfeed.ad.jp

CentOS also can be installed ntp daemon yum install ntp.

References

• http://kawatama.net/web/linux/1800
• https://qiita.com/na0AaooQ/items/af6b853faf32c58c21d3
• http://debianj.com/ubuntu/install/ntp
• https://superuser.com/questions/639202/updating-time-ntpdate3108-the-ntp-socket-is-in-use-exiting
• https://askubuntu.com/questions/244526/unable-to-synchronize-time-using-ntp
• https://vitux.com/how-to-install-ntp-server-and-client-on-ubuntu/
• https://qiita.com/tsu-nera/items/9be676b04b190e45b281
• https://zetawiki.com/wiki/리눅스_시간_변경
• https://frody.tistory.com/106
• https://antilibrary.org/422

Time Serve List

• https://www.pool.ntp.org/zone/jp
• http://jjy.nict.go.jp/tsp/PubNtp/index.html
• https://qiita.com/halpas/items/5a451ead0b13f6792595
• https://tf.nist.gov/tf-cgi/servers.cgi
• https://retilog.tistory.com/76