[root@localhost ]# cat /etc/ntp.conf | egrep -v '^#|^$'
driftfile /var/lib/ntp/drift
server 127.127.1.0
fudge 127.127.1.0 stratum 10
restrict 192.168.0.0 mask 255.255.255.0 nomodify  notrap
restrict source nomodify notrap noepeer noquery
restrict 127.0.0.1 
restrict ::1
tos maxclock 5
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
[root@localhost ]# systemctl start ntpd
[root@localhost ]# systemctl status ntpd
[root@localhost ]# systemctl enable ntpd

vim /etc/ntp.conf
加一行 ,ip为server的ip地址
server  IP
systemctl start ntpd
systemctl enable ntpd