[marco@localhost ~]$ uname -a
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[marco@localhost ~]$
[marco@localhost ~]$ sudo timedatectl
[sudo] password for marco:
Local time: Sat 2016-12-03 12:24:58 CST
Universal time: Sat 2016-12-03 04:24:58 UTC
RTC time: Sat 2016-12-03 04:24:58
Time zone: Asia/Shanghai (CST, +0800)
NTP enabled: no
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
[marco@localhost ~]$
[marco@localhost ~]$ systemctl status ntpd.service
● ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)
Active: active (running) since Sat 2016-12-03 11:24:14 CST; 1h 0min ago
Process: 1042 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 1072 (ntpd)
CGroup: /system.slice/ntpd.service
└─1072 /usr/sbin/ntpd -u ntp:ntp -g
Dec 03 11:24:17 localhost.localdomain ntpd[1072]: new interface(s) found: waking up resolver
Dec 03 11:24:17 localhost.localdomain ntpd_intres[1073]: DNS 0.centos.pool.ntp.org -> 202.65.114.202
Dec 03 11:24:17 localhost.localdomain ntpd_intres[1073]: DNS 1.centos.pool.ntp.org -> 59.125.122.217
Dec 03 11:24:18 localhost.localdomain ntpd_intres[1073]: DNS 2.centos.pool.ntp.org -> 118.67.200.10
Dec 03 11:24:18 localhost.localdomain ntpd_intres[1073]: DNS 3.centos.pool.ntp.org -> 203.158.118.2
Dec 03 11:24:20 localhost.localdomain ntpd[1072]: 0.0.0.0 c61c 0c clock_step +7.499699 s
Dec 03 11:24:27 localhost.localdomain ntpd[1072]: 0.0.0.0 c614 04 freq_mode
Dec 03 11:24:28 localhost.localdomain ntpd[1072]: 0.0.0.0 c618 08 no_sys_peer
Dec 03 11:40:09 localhost.localdomain ntpd[1072]: 0.0.0.0 c612 02 freq_set kernel -24.885 PPM
Dec 03 11:40:09 localhost.localdomain ntpd[1072]: 0.0.0.0 c615 05 clock_sync