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we have a very strange behavior

we have 12 Linux redhat machines - redhat 7.x

two of these VM servers are loosing the time synchronize each day at 5:00 in the morning

after we restart the ntp , then sync return to normal

but what could be the reason for this strange behavior ?

  • try checking ntpd logs, if you cant find the logs execute the following command ` grep log /etc/ntp.conf` this should provide you will ntpd log location. default location either /var/log/ or /var/log/ntpsatats – Ahmad Abuhasna Jul 14 at 11:35
  • Are there any relevant messages in the system log near the time NTP synchronization is lost? You said the servers are virtual machines. See if the virtualization platform includes any clock synchronization feature: if you are using NTP, you'll probably need to make sure any "sync VM's clock with the host platform" features are switched off. – telcoM Jul 14 at 12:08
  • you said = make sure any "sync VM's clock with the host platform" features are switched off" , please advice how to find this parameter? , this parameter in the Vcenter? / else? – yael Jul 14 at 12:20
  • can you post your answer please so all folks will see it , and please explain how to disable the feature ? ( and from where ? ) – yael Jul 14 at 12:57
  • Are you using NTPd or chronyd? Chronyd is the default on rhel7 and handles time management on VMs better than ntpd. – jsbillings Jul 14 at 13:18

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