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[Openstack] Clock Drift


Just put a cronjob on your vmâ??s
Ntpdate -s ip
And make sure in your ntp config you have your drift file configured

After that I never had issues with clock skew on any of my vmâ??s

Also make sure your hosts are on max performance, and not lowering their frequency for throttling, as that made the problem worse for me




From: Tim Bell <Tim.Bell at cern.ch>
Sent: Sunday, March 25, 2018 23:40
To: Tyler Bishop <tyler.bishop at beyondhosting.net>; Pablo Iranzo Gómez <Pablo.Iranzo at redhat.com>
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] Clock Drift

Are you snapshotting the VMs? Weâ??ve seen some delays while the VM is paused and being snapshotted and then there is too much time difference for NTP to catch up againâ?¦

Tim

From: Tyler Bishop <tyler.bishop at beyondhosting.net<mailto:tyler.bishop at beyondhosting.net>>
Date: Saturday, 24 March 2018 at 18:37
To: Pablo Iranzo Gómez <Pablo.Iranzo at redhat.com<mailto:Pablo.Iranzo at redhat.com>>
Cc: "openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>" <openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>>
Subject: Re: [Openstack] Clock Drift

3 Sources.  CentOS NTP pool and 2 internal.

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On Fri, Mar 23, 2018 at 3:03 AM, Pablo Iranzo Gómez <Pablo.Iranzo at redhat.com<mailto:Pablo.Iranzo at redhat.com>> wrote:
+++ Chris Friesen [22/03/18 16:22 -0600]:
On 03/21/2018 08:17 PM, Tyler Bishop wrote:
We've been fighting a constant clock skew issue lately on 4 of our clusters.
 They all use NTP but seem to go into WARN every 12 hours or so.

Anyone else experiencing this?

What clock are you using in the guest?


And how many NTPD sources?



Chris


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Pablo Iranzo Gómez (Pablo.Iranzo at redhat.com<mailto:Pablo.Iranzo at redhat.com>)          GnuPG: 0x5BD8E1E4
Senior Software Maintenance Engineer - OpenStack           iranzo @ IRC
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