Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.
Manual process:
How to install ntp in centos7?
yum install ntpd
systemctl enable ntpd
systemctl start ntpd
systemctl status ntpd
How to check ntpdate?
[root@default-centos-73 ~]# ntpdate
30 Jul 20:58:52 ntpdate[4662]: no servers can be used, exiting
How to check sourceip address of the ntpserver of the node?
ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
-204.44.81.142.s 92.27.75.51 2 u 49 128 377 80.299 111.250 20.678
+pool-72-80-171- 209.51.161.238 2 u 64 128 377 43.400 92.246 18.945
+nimitz.jeremych 142.66.101.13 2 u 123 128 377 46.324 100.206 15.133
*block.steinhoff 204.9.54.119 2 u 121 128 377 11.698 95.785 14.339
How to check logs?
just grep for ntp in
/var/log/messagesThis will tell you if/where ntp activity is being logged: grep log /etc/ntp.confChef process:
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