CentOS7設定NTP對時

Posted on Edited on In Views: Disqus: Symbols count in article: 1.8k Reading time ≈ 3 mins.

CentOS7設定NTP對時

有兩種設定方式
第一種:

可以加入ntpdate到root crontab即可

0 * * * * /usr/sbin/ntpdate time.stdtime.gov.tw && /sbin/hwclock -w

第二種

Step1:在Terminal 用date指令確認時間是否正確

[root@bacintra ~]# date
Fri Aug 10 14:14:31 CST 2018

Step2:安裝NTP套件

sudo yum -y install ntp

Step3:啟動 ntpd daemon

[root@bacintra ~]# systemctl start ntpd
[root@bacintra ~]# systemctl status ntpd
● ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled)
Active: active (running) since Fri 2018-08-10 14:11:12 CST; 8s ago
Process: 1266 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 1267 (ntpd)
CGroup: /system.slice/ntpd.service
└─1267 /usr/sbin/ntpd -u ntp:ntp -g

Aug 10 14:11:12 bacintra ntpd[1267]: Listen normally on 2 lo 127.0.0.1 UDP 123
Aug 10 14:11:12 bacintra ntpd[1267]: Listen normally on 3 enp2s0 10.10.10.103 UDP 123
Aug 10 14:11:12 bacintra ntpd[1267]: Listen normally on 4 virbr0 172.16.122.1 UDP 123
Aug 10 14:11:12 bacintra ntpd[1267]: Listen normally on 5 lo ::1 UDP 123
Aug 10 14:11:12 bacintra ntpd[1267]: Listen normally on 6 enp2s0 fe80::4a5b:39ff:fe05:231c UDP 123
Aug 10 14:11:12 bacintra ntpd[1267]: Listening on routing socket on fd #23 for interface updates
Aug 10 14:11:13 bacintra ntpd[1267]: 0.0.0.0 c016 06 restart
Aug 10 14:11:13 bacintra ntpd[1267]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM
Aug 10 14:11:13 bacintra ntpd[1267]: 0.0.0.0 c011 01 freq_not_set
Aug 10 14:11:13 bacintra ntpd[1267]: 0.0.0.0 c614 04 freq_mode

Step4:讓系統在開機時自動啟用 ntpd daemon

[root@bacintra ~]# systemctl is-enabled ntpd
disabled
[root@bacintra ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@bacintra ~]# systemctl is-enabled ntpd
enabled