NTP Sync Failures

Overview

A customer reports NTP Sync failures were observed in the nodes and they were using the chrony daemon provided by Linux. Example output reported by customer:

[root@JNK-JAM-RHC-Logger-02 ~]# chronyc tracking
Reference ID : 00000000 ()
Stratum : 0
Ref time (UTC) : Thu Jan 01 00:00:00 1970
System time : 0.000000000 seconds fast of NTP time
Last offset : +0.000000000 seconds
RMS offset : 0.000000000 seconds
Frequency : 0.000 ppm slow
Residual freq : +0.000 ppm
Skew : 0.000 ppm
Root delay : 1.000000000 seconds
Root dispersion : 1.000000000 seconds
Update interval : 0.0 seconds
Leap status : Not synchronised
[root@JNK-JAM-RHC-Logger-02 ~]#
[root@JNK-JAM-RHC-Logger-02 ~]# ntpstat
unsynchronised
poll interval unknown

Solution

As such this is an OS-level issue and the customer needs to contact RHEL Support. However here are steps to install chrony daemon and verify it:

systemctl status chronyd
yum install chronyd
systemctl enable -now chronyd
systmectl status chronyd
chronyc activity
chronyc sources
chronyc sourcesstats -v