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NTP server on CentOS 7 or Network Time Protocol Server

NTP alarm


NTP statusntpq -p


Code Block
titlentpd -p
[root@128t-5 t128]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
185
x.
216
x.
97.5
x.x
10
y.
75
y.
52
y.
2
y       4 u  684 1024    7    0.518   -0.117   1.365
185
x.
216
x.
96.5
y.x
51
z.
15
z.
175.180
z.z       3 u  685 1024    7   11.860   -0.753   1.472


Stop 


Stop + resync and start nptd demon



Code Block
titlestop and start
systemctl stop ntpd
ntpdate 185x.216x.97x.5x
( or ntpdate 185x.216x.96y.5x )
systemctl start ntpd
ntpq -p


look for the *


Code Block
titlenptq -p
[root@128t-5 t128]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*185 x.216x.97.5x.x           10y.75y.52y.2y       4 u    5   64   17    1.074    0.873   0.417
 185x.216x.96.5y.x           51z.15z.175.180z.z        3 u    3   64   17   12.374    0.235   0.468




...