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<p class="MsoNormal">Just put a cronjob on your vm’s <o:p></o:p></p>
<p class="MsoNormal">Ntpdate -s ip<o:p></o:p></p>
<p class="MsoNormal">And make sure in your ntp config you have your drift file configured<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After that I never had issues with clock skew on any of my vm’s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Also make sure your hosts are on max performance, and not lowering their frequency for throttling, as that made the problem worse for me<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Tim Bell <Tim.Bell@cern.ch> <br>
<b>Sent:</b> Sunday, March 25, 2018 23:40<br>
<b>To:</b> Tyler Bishop <tyler.bishop@beyondhosting.net>; Pablo Iranzo Gómez <Pablo.Iranzo@redhat.com><br>
<b>Cc:</b> openstack@lists.openstack.org<br>
<b>Subject:</b> Re: [Openstack] Clock Drift<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Are you snapshotting the VMs? We’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 again…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Tim<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Tyler Bishop <<a href="mailto:tyler.bishop@beyondhosting.net">tyler.bishop@beyondhosting.net</a>><br>
<b>Date: </b>Saturday, 24 March 2018 at 18:37<br>
<b>To: </b>Pablo Iranzo Gómez <<a href="mailto:Pablo.Iranzo@redhat.com">Pablo.Iranzo@redhat.com</a>><br>
<b>Cc: </b>"<a href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a>" <<a href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a>><br>
<b>Subject: </b>Re: [Openstack] Clock Drift<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><a name="_MailOriginalBody">3 Sources. CentOS NTP pool and 2 internal.<o:p></o:p></a></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:12.0pt;font-family:"Trebuchet MS",sans-serif;color:black">Tyler Bishop</span></b></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:12.0pt;font-family:"Century Gothic",sans-serif;color:black"><o:p></o:p></span></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody">On Fri, Mar 23, 2018 at 3:03 AM, Pablo Iranzo Gómez <</span><a href="mailto:Pablo.Iranzo@redhat.com" target="_blank"><span style="mso-bookmark:_MailOriginalBody">Pablo.Iranzo@redhat.com</span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody">>
wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody">+++ Chris Friesen [22/03/18 16:22 -0600]:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody">On 03/21/2018 08:17 PM, Tyler Bishop wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody">We've been fighting a constant clock skew issue lately on 4 of our clusters.<br>
They all use NTP but seem to go into WARN every 12 hours or so.<br>
<br>
Anyone else experiencing this?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><br>
What clock are you using in the guest?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
And how many NTPD sources? <o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><br>
Chris<br>
<br>
<br>
_______________________________________________<br>
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<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
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<span style="mso-bookmark:_MailOriginalBody"><span class="hoenzb"><span style="color:#888888">--
</span></span><span style="color:#888888"><br>
<br>
<span class="hoenzb">Pablo Iranzo Gómez (</span></span></span><a href="mailto:Pablo.Iranzo@redhat.com" target="_blank"><span style="mso-bookmark:_MailOriginalBody">Pablo.Iranzo@redhat.com</span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><span class="hoenzb"><span style="color:#888888">)
GnuPG: 0x5BD8E1E4</span></span><span style="color:#888888"><br>
<span class="hoenzb">Senior Software Maintenance Engineer - OpenStack iranzo @ IRC</span><br>
<span class="hoenzb">RHC{A,SS,DS,VA,E,SA,SP,AOSP}, JBCAA #110-215-852 RHCA Level V</span><br>
</span><br>
_______________________________________________<br>
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