Oracle Exadata: chrony Daemon (release 19.1)

Release 19.1 of Exadata has taken a leap in using chrony daemon instead of age old written NTP daemon and protocol.

You will not find any NTP daemon installed once you upgrade to this release and note in this release you are at Linux 7. 

To check status of chrony daemon here are few commands which will help. 

1. Check Sources

# chronyc sources

210 Number of sources = 3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? aa-bbb-ccc-1100.dddddddd>     3   4   377     3  -2328ms[-2328ms] +/- 8332ms
^? bb-bbb-ccc-1100.dddddddd>     3   4   377     4  -2358ms[-2358ms] +/- 8681ms

^? cc-bbb-ccc-1100.dddddddd>     3   4   377     7  -2321ms[-2321ms] +/- 8696ms

2. Check Source stats

# chronyc sourcestats

210 Number of sources = 3

Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev

==============================================================================

aa-bbb-ccc-1100.dddddddd>   6   3    81   +951.004   4830.397  -2334ms    31ms

bb-bbb-ccc-1100.dddddddd>   9   4   129   -438.641    216.568  -2372ms  4677us

cc-bbb-ccc-1100.dddddddd>  26  11   421   -381.175     20.365  -2332ms  3727us

3. Check sync

# chronyc tracking

Reference ID    : 0A901009 (cc-bbb-ccc-1100.dddddddd)

Stratum         : 4

Ref time (UTC)  : Mon Aug 26 03:19:47 2019

System time     : 0.000000304 seconds fast of NTP time

Last offset     : -0.000190595 seconds

RMS offset      : 0.012864766 seconds

Frequency       : 84.308 ppm slow

Residual freq   : -0.004 ppm

Skew            : 0.720 ppm

Root delay      : 0.140609756 seconds

Root dispersion : 1.491145134 seconds

Update interval : 16.1 seconds

Leap status     : Normal

You can find more details on chrony commands here 

https://www.thegeekdiary.com/centos-rhel-7-configuring-ntp-using-chrony/