<p dir="ltr">Use the below command<br>
nova hypervisor-server id</p>
<div class="gmail_quote">On 14 Feb 2014 16:14, "Tim Bell" <<a href="mailto:Tim.Bell@cern.ch">Tim.Bell@cern.ch</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Robert,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">How about sharing the script if you can get it to a generic state ? This would seem to be an activity that many operators would like
to be able to do.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Tim<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Joe Topjian [mailto:<a href="mailto:joe@topjian.net" target="_blank">joe@topjian.net</a>]
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<b>Sent:</b> 14 February 2014 09:13<br>
<b>To:</b> Robert van Leeuwen<br>
<b>Cc:</b> <a href="mailto:openstack-operators@lists.openstack.org" target="_blank">openstack-operators@lists.openstack.org</a><br>
<b>Subject:</b> Re: [Openstack-operators] Putting a hypervisor into maintenance / how to get a list of all instance IDs on a host<u></u><u></u></span></p>
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<p class="MsoNormal">Hello,<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">> nova-manage (and I believe somewhere in the nova command as well?) can disable a service. This will
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<p class="MsoNormal">> prevent new instances from spawning but still allow them to be migrated to another host.
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<p class="MsoNormal">Yes this is what I use in my script.<u></u><u></u></p>
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<p class="MsoNormal">I think this is the best way to go about maintenance.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">> And there's also the "nova evacuate" command, but I've never used it, so I'm not entirely sure how it works <u></u><u></u></p>
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<p class="MsoNormal">> or when to use it: <u></u><u></u></p>
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<p class="MsoNormal">From what I have read from the docs this is used when you have a failed hypervisor and want to spawn the instances somewhere else.
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<p class="MsoNormal">Indeed, but it's curious that there is an optional "shared storage" flag. IMO, shared storage should be enabled by default and optionally off. Without the shared storage flag, the best that can be done is launching new instances of a specific
image on another node, which is perhaps worse than any type of evacuation.<u></u><u></u></p>
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<p class="MsoNormal">I need to try this command out in a sandbox to learn more about it.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">I was just wandering what people do when they want to put a node into maintenance.<br>
We want to live-migrate everything to another host and I was wondering if people already build scripts for this.<u></u><u></u></p>
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<p class="MsoNormal">It sounds like you're doing the right thing: disable the service, look up the instances, loop and migrate them to other server(s). <u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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Cheers,<br>
Robert van Leeuwen<u></u><u></u></p>
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