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Checking NTP Status

Checking NTP Status#

To check NTP status:

$ ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+chl.la          216.218.254.202  2 u    8   64    3  174.046    2.242   2.282
*utcnist2.colora .NIST.           1 u    3   64    3  164.484   10.623   3.013
 ntp.newfxlabs.c .STEP.          16 u    -   64    0    0.000    0.000   0.000
+103.245.79.2    118.189.138.5    2 u    9   64    3  275.932   -4.128   1.948

If the output looks like this, check the NTP configuration is located at /etc/ntp.conf.

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*LOCAL(0)        .LOCL.          10 l    5   64  377    0.000    0.000   0.000

Enabling/Disabling NTP#

To enable NTP:

$ timedatectl set-ntp true --adjust-system-clock

To disable NTP:

$ timedatectl set-ntp false

Synchronizing Clock#

To force synchronization:

$ ntpdate -s time.nist.gov

Changing System Clock#

Sometimes it is necessary to change the system date in order to renew a certificate, for example to renew an already expired certificate or for testing.

To change the system date, first disable NTP, then change the date:

$ timedatectl set-time <YYYY-MM-DD>
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