NTP in Linux
NTP is a core protocol used by most IT infrastructures. Its purpose is to synchronize date and time information.
However, it is very important to configure NTP for your servers, clients, and other network devices. NTP uses a UDP port number, which is 123 by default.
In this article, we will explain the use of NTP, we will also see the sample execution of the commands along with necessary explanations to make the topic easier to understand.
Network Time Protocol (NTP) in Linux
An example is shared below where we illustrate the use of command NTP in Linux. The command will look like this:
$ systemctl status ntp
We printed the NTP service status list through the above command.
After executing the above command, you will get the output as shown below.
ntp.service - Network Time Service
Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2022-08-14 14:23:48 PST; 10h left
Docs: man: ntpd (8)
Main PID: 80903 (ntpd)
Tasks: 2 (limit: 3476)
Memory: 3.2M
CGroup: /system.slice/ntp.service
L80901 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -U 131:139
Aug 14 03:26:39 ubuntu ntpd[80903]: Soliciting pool server 62.12.173.11
Aug 14 03:26:42 ubuntu ntpd[80903]: Soliciting pool server 91.189.89.198
Aug 14 03:27:45 ubuntu ntpd[80903]: Soliciting pool server 2001:4f8:110: 12c8: :2:123
Aug 14 03:27:47 ubuntu ntpd[80903]: Soliciting pool server 91.189.94.4,
Aug 14 03:28:51 ubuntu ntpd[80903]: Soliciting pool server 2001:8a8: 1005:1::11
Aug 14 03:28:53 ubuntu ntpd[80903]: Soliciting pool server 2001:67c:1560:8003::07
Aug 14 03:29:38 ubuntu ntpd[80903]: kernel reports TIME ERROR: Ox41: Clock Unsynchronized
Aug 14 03:29:57 ubuntu ntpd[80903]: Soliciting pool server 2001:440:1880:5555: :2
Aug 14 03:29:58 ubuntu ntpd[80903]: Soliciting pool server 2001:67c:1560:8003: :08
Aug 14 03:31:02 ubuntu ntpd[80903]: Soliciting pool server 2001:a98:11::40
请注意, the commands shared in this article are only applicable to Linux environment.
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